Forthcoming Articles http://www.jim.org.cn EN-US http://www.jim.org.cn/EN/1000-324X/current.shtml http://www.jim.org.cn 1000-324X http://www.jim.org.cn/EN/10.15541/jim20210158 in vitro, the bonding ability of different pastes with dentin, as well as the ability to induce dentin remineralization and occlude dentin tubules in vitro, was investigated. The results indicated that the MNBGP could be tightly combined with the dentin interface, and the MNBGs with smaller particle sizes were more uniformly distributed on the surface of the demineralized dentin slices. MNBGP could well mineralize in artificial saliva (AS) to form apatite (HA), induce dentin remineralization, and occlude dentin tubules, which resulted in thickness of HA layer, formed on the surface of demineralized dentin slices, increased with the prolonged mineralization time, and up to 5-10 μm after 28d dentin remineralization. The size of bioactive glass microspheres had a certain impact on its ability to induce remineralization. When the particle size was equal to or slightly smaller than the diameter of the exposed dentin tubules, it could better mineralize and occlude the dentin tubules.All data indicate that MNBGP has potential application for dentin hypersensitivity treatment.]]> http://www.jim.org.cn/EN/10.15541/jim20210142 2 nanosheets (CeO₂ NSs) were obtained via flame annealing intermediate product CeCO₃OH nanosheets synthesized by simple hydrothermal method. Through controlling of the flame time, oxygen vacancies were introduced into the CeO₂ NSs. As a result, the CeO₂ NSs annealed with 2 min (CeO₂-2min NSs) exhibited outstanding reproducibility and selectivity towards CO gas. Particularly, the response/recovery time were extremely fast (2 s/2 s) towards 500 μL/L CO at 450 °C as well as finely functional relationship between response and the concentration of CO at a wide detection range (10-10000 μL/L). The superior gas sensing performance of CeO₂-2min NSs can be ascribed to the high aspect ratios of the porous two-dimensional structure and abundant oxygen vacancies in the crystals. This work may supply a strategy for designing ultrafast gas sensors which can detect target gas at a wide range.]]> http://www.jim.org.cn/EN/10.15541/jim20210139 4)₂WS₄)) were encapsulated into the inner cavity of carbon nanotubes, which were thermally decomposed into tungsten oxides inside the CNTs. Raman spectra, X-ray diffraction, and atomic-resolution scanning transmission electron microscopy characterizations confirm that the CNT-filling products are ultrafine one-dimensional W₃O₈ nanowires, that appears in 1.23-1.93 nm in width (corresponding to four-five arrays of tungsten atomic column) and up tens of microns in length (close to that of CNTs). The non-noticeable size-dependent lattice parameters of the W₃O₈ nanowires and the large nanowire-CNT separation indicate a rather weak interaction between the filled W₃O₈ nanowires and host CNTs, which provides the opportunity to separate and probe the intrinsic properties of these ultrafine 1D W₃O₈ nanowires. Nevertheless, the proposed synthetic method should be extendable to achieve other 1D transition metal oxides.]]> http://www.jim.org.cn/EN/10.15541/jim202100125 Aggregatibacter actinomycetemcomitans (A. a) and Porphyromonas gingivalis (P. g), were chosen to evaluate the antibacterial effect of the composite coating. Spreading, proliferation and associated gene expression of human gingival fibroblasts on Ti, Ti/ZnO, and Ti/ZnO/Fn were evaluated. In vivo peri-implantitis model was established on SD rat maxilla through the infusion of mixed bacterial suspension. The peri-implant bone resorption and inflammatory infiltration in gingiva were investigated. The results showed that antibacterial efficacies of the composite coating against A. a and P. g for 24 h were up to 80.9% and 75.7%, respectively. Fibroblasts on the surface of Ti/ZnO/Fn showed adhesion and proliferation in vitro. In the model of peri-implantitis, Micro-CT showed that the amount of peri-implant bone absorption of Ti was (1.14±0.71) mm, while the amount of Ti/ZnO/Fn was only (0.37±0.28) mm. Moreover, the observation of paraffin section and qPCR revealed that inflammation level of gingiva and alveolar bone around Ti was lower in Ti/ZnO/Fn than in other gropes. In conclusion, the composite coating for dental implants might be effective on defensing bacterial invasion, enhancing gingiva attachment and preventing inflammation response of gingiva.]]> http://www.jim.org.cn/EN/10.15541/jim20210109 http://www.jim.org.cn/EN/10.15541/jim20210076 Enteromorpha Prolifera was used as the raw material to prepare alga-based carbon dots (CDs) through a hydrothermal method, and CDs-Cu-TiO₂ composite nanomaterials were further synthesized as a photocatalyst for pollutant degradation. The results show that CDs, Cu²⁺ and TiO₂ are closely combinedwithin the composite material. Compared to the pure TiO₂ nanoparticles, the absorption of CDs-Cu-TiO₂ in the visible light range is significantly enhancedand the fluorescence emission efficiency is decreased. The doping of CDs and Cu²⁺ produces a synergistic effect, which changes the band gap of the composite material to 2.35 eV, and effectively inhibits the recombination of electrons and holes. The photocatalytic degradationexperiment usingRhodamine B as a model pollutant showsthat under visible light irradiation the first order rate constant of degradation catalyzed by alga-based CDs-Cu-TiO₂ reaches 6.4 times of that degraded bypure TiO₂ nanoparticles, and the degradation efficiency after150 min is close to 100%, which is double of the value whenTiO₂ nanoparticles apply.]]> http://www.jim.org.cn/EN/10.15541/jim20200682 2(PS) composites were fabricated by Sol-gel method based on multiple coordination reactions. The structure and morphology of 3D hierarchical pore rGO/TiO₂(PS) composites were characterized by different methods, and the effects of PS addition on the crystal structure, microscopic morphology and photocatalytic performance of rGO/TiO₂ composites were studied.Under simulate ultraviolet light and visible light irradiation, tetracycline hydrochloride (TTCH) using as the target pollutant, the photocatalytic performance of 3D hierarchical porerGO/TiO₂(PS) composites prepared with different PSaddition was evaluated. Under simulated visible light irradiation, the 3D hierarchical pore rGO/TiO₂(5wt%PS) compositeswere subjected to multiple recycling tests.The results show that the rGO/TiO₂(PS) composites have a 3D hierarchical pore bulk structure. As the reinforcing phase of matrix, GO keeps the stability of multistage pore rigid skeleton structure through Ti-O-C bond. Furthermore, And the introduction of PS increases the specific surface area of the rGO/TiO₂(PS) composites. The 3D hierarchical pore rGO/TiO₂(7wt%PS) composite has the highest adsorption efficiency for TTCH,while the 3D hierarchical pore rGO/TiO₂(5wt%PS) composite has the highest photocatalytic activity and stability, which photocatalytic efficiency still reaches 81.02% after 4 cycles of recycling tests; the best addition amount of template PS is 5wt%.]]> http://www.jim.org.cn/EN/10.15541/jim20210044 2 emissions, the energy crisis and the greenhouse question that humans are facing have become serious increasingly. The direct synthesis of olefins by CO₂ hydrogenation with iron-based catalysts is one of the best ways to achieve the emission of CO₂ reduction with CO₂ conversion and utilization. In this study, zirconia (ZrO₂)-supported iron-cobalt catalyst (Fe-Co/ZrO₂) and ZrO₂-supported iron-cobalt-potassium catalyst (Fe-Co-K/ZrO₂) were prepared by impregnation method, which were used for CO₂ hydrogenation to light olefins (C₂⁼-C₄⁼), and the effect of K on the catalytic activity were investigated emphatically. At the condition of 300 °C and 1.5 MPa, the activity test show that the addition of K increases the CO₂ conversion from 40.8% to 44.8% and improves the selectivity of light olefins from 0.23% to 68.5%, the stability of catalytic performance is raised as well. The characterization results show that the introduction of K improves the electron cloud density of the iron species, enhances the adsorption strength of the Fe to CO₂, promotes the formation of iron carbide, and facilitates the direct dissociation of CO₂ after adsorption on Fe species, thus boosts the performance of CO₂ hydrogenation to light olefins.]]> http://www.jim.org.cn/EN/10.15541/jim20210105 -1, the De-Sb/MCNT delivers the reversible specific capacity of 408.6mAh·g^-1 with the initial Coulombic efficiency of 69.2%. After 330 cycles at 800 mA·g^-1, the capacity retention rate can still retain 88%. The superior cycle performance of De-Sb/MCNT benefits from the “pre-pulverization” effect of mechanically-assisted chemical alloying/acid dissolution dealloying on commercial Sb, which promotes the nanocrystallization and porosity of the material. The De-Sb/MCNT relieves the volume expansion during charging and discharging, thus achieves excellent cycle stability. This dealloying process at ambient temperature is expected to provide a new approach for sodium storage of alloy anode materials with prolongedandstablecycles.]]> http://www.jim.org.cn/EN/10.15541/jim20210091 f/SiC) were prepared by infiltrating Si melt into carbon-doped preforms with various pore structures. The effects of pore structure on the melt infiltration and the received SiC_f/SiC composites were investigated. The results indicated that the preforms with more homogeneous pore size could lead to more sufficient melt infiltration, and also resulted in fewer residual pores and better mechanical properties in the composites. This study can provide important guidance for the pore structure regulation in the fabrication of RMI- composites.]]> http://www.jim.org.cn/EN/10.15541/jim20200703 in-situ and material service environment are easier simulated; 4) multi-scale, multi-faceted and multi-type structural information can be synchronously acquired; 5) new means to detect new structural characteristics are more likely. Therefore, the application of SR techniques is bound to greatly promote the research progress of inorganic materials and help solve some key scientific problems in the field of inorganic materials. This paper first briefly introduces the current status of SR sources and the three existing domestic SR facilities, namely, Beijing Synchrotron Radiation Facility (BSRF), Shanghai Synchrotron Radiation Facility (SSRF), and National Synchrotron Radiation Laboratory (NSRL). Secondly, some application examples related to inorganic materials research are given in this paper from the four aspects of X-ray diffraction, scattering, spectroscopy and imaging. Finally, summary and prospect are given to the SR source, the structurally characterization techniques, and their application in inorganic materials.]]> http://www.jim.org.cn/EN/10.15541/jim20210070 2), as a transition metal oxide, has thermochromic property, which undergoes metal to insulator transition (MIT) in response to external temperature changes, and is accompanied by numerous changes in physical property. It has attracted widespread attention in the field of smart windows. In recent years, research on the preparation method of VO₂, the phase change mechanism, and the improvement ofoptical performance are quite rich. However, in practical applications, technical bottlenecks and challenges are still faced, such as higher intrinsic transition temperature (T_c), lower luminous transmittance (T_lum), insufficient solar modulation ability(ΔT_sol), the metastability and durability, and uncomfortable color for human eyes (brownish yellow). At present, there have been many researches related to the improvement of the performance of VO₂ itself owing to its insufficient optical property, and general methods for improving its performance such as elements doping, multilayer film structure design, and microstructure design have been widely adopted. This review summarizes the general performance improvement strategies of VO₂ film, and highlights the latest research progress of VO₂-based smart window service performance, low-temperature flexible preparation and color modulation in practical applications. It’s also discussed future development trends in terms of skin comfortand environmental friendliness.]]> http://www.jim.org.cn/EN/10.15541/jim20210063 3Si₂O₅(OH)₄microsphereswere synthesized via a hydrothermal method by using NiCl₂and tetraethyl orthosilicate (TEOS)as the raw materials.The effects ofNi/Si molar ratio and alkali source on the phase composition, morphology and textural property of the products were investigated. Underoptimized conditions, the as-synthesized Ni₃Si₂O₅(OH)₄microspherespresented a nanosheets-assembled morphologywith an average diameter ofca. 2.5 μm, S_BETof 119.6 m²·g^-1; pore volume of 0.673 cm³·g^-1, and Zeta potential measurements showed they werenegatively chargedwith the pH ranging from 3 to 10.When employed as the adsorbents for basic fuchsin (BF), the Ni₃Si₂O₅(OH)₄microspheres showed an adsorption capacity of120.7 mg·g^-1with the removal efficiency up to 96.6% from a50 mg·L^-1solution, superior tomost of the referred adsorbents in literatures, and the adsorption kinetic datacan be well interpretated via the pseudo-second-order model. The data of the relationship betweenequilibrium adsorption capacity and BF concentration were wellfitted by Freundlich isotherm model with the 1/n valueof 0.1678, indicatingthat the surface was heterogeneous and the adsorption strength was strong.]]> http://www.jim.org.cn/EN/10.15541/jim202100056 3^2- ions during the degradation of calcium silicate in composite electrospun scaffolds, which are bioactive in stimulating angiogenesis. However, the effective ion concentration is in a narrow range from 0.79 to 1.8 μg/mL. Therefore, it is of great significance for tissue engineering applications to accurately control the ion release concentration of the calcium silicate composite scaffolds, so that the ions released from materials can remain in the effective concentration range for a long time. In this study, we prepared a variety of scaffolds with calcium silicate composite electrospun by adjusting pore size of electrospun scaffolds and controlling the location of calcium silicate nanowires inside the scaffolds, and compared ions release behavior and bioactivity in promoting proliferation of human umbilical vein endothelial cells in vitro. The results showed that, due to the hydrophobicity of polymers and limited diffusion of small pore size, electrospun scaffoldswith small pore size by mixed-electrospinning or electrospinning-electrospraying calcium silicate composite displayed slow-release behavior of SiO₃^2- ions. In vitro cell experiments showed that the electrospun scaffolds with slow ions release promoted the proliferation of human umbilical vein endothelial cells, indicating that the bioactivity of the composite scaffolds could be regulated by adjusting ions release behavior to obtain optimal bioactivity for tissue engineering applications.]]> http://www.jim.org.cn/EN/10.15541/jim20210043 http://www.jim.org.cn/EN/10.15541/jim202100034 2O₄ transparent ceramic,were predicted by this approach, whichagreed well with the experimental values. It is shown that the ratio of cation inversion, the hardness and bulk modulus of chemical bonds in MgAl₂O₄ vary significantly with temperature around 800鈩�. However, due to coupling effect of the coordinated polyhedra, the temperature-dependent cation inversion can hardly affect the high-temperature thermomechanical properties of MgAl₂O₄ transparent ceramic.]]> http://www.jim.org.cn/EN/10.15541/jim20210013 2 particles to m-ZrO₂ particles and the degree of the phase transition decreasing from top to bottom. it is also found that the CMAS-induced phase transition mainly occurs at the grain boundaries since the molten CMAS is easier to penetrate and erode along the grain boundaries of the coating.]]> http://www.jim.org.cn/EN/10.15541/jim20210092 2) to syngas (a mixture of CO and H₂) can not only realize the carbon cycle and decrease the greenhouse effect but also alleviate the energy crisis. The design of catalyst is the key to realize CO₂ resource utilization.Herein, CuO and CuO/ZnO composite were prepared by metal ion co-precipitation method, and the performance of electrochemical CO₂ reduction to syngas under different potentials was investigated by adjusting the catalyst components. The results show that the introduction of zinc (Zn) species can decrease the adsorption intensity of intermediate CO₂^•? on the catalyst, which leads to the decrease of Faraday efficiency (FE) of CO and the increase of FE of H₂, thus achieving controllable regulation of CO/H₂ in the range of 1/1~1/4 under different applied electrochemical potential. In particular, the total FE of syngas CO/H₂ is up to 84% when the ratio of Cu to Zn in the precursor solution is 1:2.]]> http://www.jim.org.cn/EN/10.15541/jim20210090 http://www.jim.org.cn/EN/10.15541/jim20210080 http://www.jim.org.cn/EN/10.15541/jim202100078 http://www.jim.org.cn/EN/10.15541/jim20200751 3 nanosheets were prepared,and then its phototherapeutic properties were investigated. The bulk FePS₃was synthesized by a high-temperature solid-phase method and FePS₃ nanosheets were obtained by an ultrasonic-assisted liquid phase exfoliating method.The nanosheets displayed particle morphology with average hydrated size of less than 200 nm (153 nm in average), performed photothermal conversion efficiency of 19.7% under 1064 nm laser irradiation, and generated reactive oxygen species under 660 nm laser irradiation.Cell experiment results showed that FePS₃ nanosheets hadexcellent photothermal and photodynamictherapeutic effects.Therefore, FePS₃ nanosheets can be used as both photothermal agent and photosensitizer to achieve combined photothermal-photodynamic therapyfor treating tumors,which shows great application potential.]]> http://www.jim.org.cn/EN/10.15541/jim20210032 k-mean clustering method. Based on the cross-sectional scanning electron microscopy observation results, the signals of the coatings under bending load were classfiedto substrate deformation, surface vertical cracks, sliding interface cracks and opening interface cracks, respectively. The frequency ranges of various types of signals and the wavelet energy coefficients were obtained by fast Fourier transform and wavelet analysis. The acoustic emission signal frequencies of substrate deformation, surface vertical crack, sliding interface crack and opening interface crack are 100, 310, 590and 450kHz respectively. The coating bending failure process mainly includes four stages, which are the initial damage stage where vertical cracks sprout on the surface of the tensioned side, the surface vertical crack proliferation stage, the damage accumulation stage where the interface cracks on both sides expand rapidly, and the macroscopic spalling stage where the coating on the stressed side is found to spall significantly.]]> http://www.jim.org.cn/EN/10.15541/jim20210015 http://www.jim.org.cn/EN/10.15541/jim20200745 2/g, which is significantly higher than CB (132.7 m²/g) and CaO-CB (177.2 m²/g). Meanwhile, the adsorption perfermance of CaO-Bent-CB to lead ions in water was evaluated. The results showed that the removal efficiency reached 98% after 6 h-adsorption and the adsorption capacity was 109.6 mg/g when the concentration of lead ion was 120 mg/L, the weight ratio of bentonite to corncob residues was 1:5, and the dosage was 1 g/L. The adsorption capacity of CaO-Bent-CB was higher than that of CB (13.4 mg/g), bentonite (72.9 mg/g) and CaO-CB (86.9 mg/g). Moreover, the lead ion contaminated soil was stabilized by CaO-Bent-CB. When the concentration of lead ion in soil is 2200 mg/kg, and the loading of CaO-Bent-CB is 8% of soil, the concentration of lead ions in acid leachate (H₂SO₄-HNO₃, pH=3.2, 12 h-soaking) was 4.5 mg/L, which is lower than the standard value of hazardous waste identification (5 mg/L). The results show that CaO-Bent-CB has a great potential in the treatment of water and soil with heavy metals.]]> http://www.jim.org.cn/EN/10.15541/jim20200742 2, SiO₂, BaTiO₃, ZnSnO₃, MoS₂, r-GO sheets, and nanofibril-phosphorene were introduced into polymers to improve the output power density of TENGs by dozens of times. Based on the domestic and international research, this review introduces the applications of the composite film in TENGs. The improvementsof TENGs induced by the fillers are discussed from two aspects: the surface property and electrical property. Finally, future challenges in developing composites based TENGs are prospected.]]> http://www.jim.org.cn/EN/10.15541/jim20200738 1.06-_xGe_xTe (x=0, 0.01, 0.02, 0.03, 0.04) polycrystalline block samples with different Ge doping contents were efficiently synthesized by vacuum melting quenching and spark plasma sintering. The as-obtained Mn_1.06-xGe_xTe bulk was dense and consisted of homogeneous composition. Tiny extensive Mn can effectively restrict the formation of the second phase of MnTe₂and improve the thermoelectric properties of the matrix phase. The electrical conductivity of materials increasing to 7×10³ S∙cm^-1 results from the enhanced carrier concentration 7.328×10¹⁸ cm^-3 at 873 K, which contributed to a power factor of620 μW∙m^-1∙K^-2 by 4% Ge doping. Meanwhile, Mn_1.06-xGe_xTeshowed the reduced thermal conductivity of 0.62W∙m^-1∙K^-1 by enhancedphononsscattering intensified with point defects, realizing the effective regulation of both electrical- and thermal-transport properties. Mn_1.02Ge_0.04Te achieved a thermoelectric performance of 0.86 at 873 K,which evolved by 43% compared with the pristine sample.]]> http://www.jim.org.cn/EN/10.15541/jim20200727 3+, the emission spectra and color coordinates of the assembled devices can be adjusted from the cold white region to the warm white region. (Ce_xY_1-x)₃Al₅O₁₂ (x=0.0005, 0.0010, 0.0030, 0.0050, 0.0070 and 0.0100) transparent ceramics was fabricated by a solid state reaction method, with the high pure (≥99.99%) commercial powders α-Al₂O₃, Y₂O₃, CeO₂ using as raw materials. The ceramic green bodies were sintered in 1750 鈩� for 20h under vacuum of 5.0×10^-5 Pa and the ceramics were annealed at 1450 鈩� for 10h in the muffle furnace. The in-line transmittance of double polished Ce:YAG ceramics is higher than 79% at 800 nm (0.2 mm, 0.4 mm, 1.0 mm thick, respectively).The thermal conductivity of Ce:YAG transparent ceramics decreases with the increase of measuring temperature and doping concentration. The thermal distribution of ceramics and LEDs with different thicknesses was simulated by the finite element method, and the thermal distributions of three packaging modes were compared. White light with chromaticity coordinates of (0.3319,0.3827) and (0.3298,0.3272) and luminous efficiency of 122.4 lm/W and 201.5lm/W were prepared by combining transparent ceramics with LEDs/LDs. We combined Ce:YAG and blue LEDs chips to produce 10W, 50 W mature lamps, which can be used for commercial purposes. Therefore, the Ce:YAG transparent ceramics is a highly promising color conversion material for high power lighting and displaying applications in the future.]]> http://www.jim.org.cn/EN/10.15541/jim20200698 via melting-quenching (MQ) combined with plasma activated sintering (PAS), the SHS+PAS samples can slightly increase the electrical conductivity and significantly reduce the lattice thermal conductivity by ~6%. Finally, the thermoelectric properties are optimized, and the ZT is improved in the whole temperature range withthe maximum value of 0.5 is obtained 773K.]]> http://www.jim.org.cn/EN/10.15541/jim20200690 -1. The optimal sample exhibits highly ordered two-dimensional hexagonal channels, with a specific surface area of 675 m²·g^-1, a pore volume of 1 cm³·g^-1, and a pore diameter concentrated at about 3.84 nm. The Li-S batteries with this mesoporous carbon as the sulfur host showed excellent electrochemical performance. After 300 cycles, the specific discharge capacity and capacity retention were 688 mAh·g^-1 and 67.1% at a current density of 0.2C, respectively, while the specific capacity could reach 556 mAh·g^-1 at a current density of 3C.]]> http://www.jim.org.cn/EN/10.15541/jim20200679 2O₄ transparent ceramics with high absorption cross section and high in-line transmittance, the cobalt doped magnesium aluminum spinel nanopowders with pure phase were synthesized via the co-precipitation method. Andafter vacuum sintering and hot isostatic pressing (HIP), highly transparent 0.05at% Co:MgAl₂O₄ ceramics were obtained. The influences of pre-sintering temperature on morphology and optical property of the Co:MgAl₂O₄ ceramics were studied. With the pre-sintering temperature increasing from 1500-1650鈩�, the relative density increased from 95.2% to 98.5%, while the relative density decreased to 97.7% with the pre-sintering temperature increasing to 1700鈩�.Becauseof the relative low density, the Co:MgAl₂O₄ ceramics were all opaque after vacuum pre-sintering.In the sintering temperature range of 1500-1700鈩�, the average grain size increased from 2.3 to 11.3 μm. After HIP post-treatment, the Co:MgAl₂O₄ ceramics pre-sintered from 1550 to 1700鈩僿ere all transparent, the Co:MgAl₂O₄ ceramics pre-sintered at 1650鈩� for 5 h and HIP post-treated at 1800鈩� for 3 h showed the best optical quality, which were 81.4% at 400 nm and 85.9% at 900 nm, and the average grain size was 16.8 μm. The broad absorption bands in the wavelength range of 500-700 nm and 1200-1600 nm indicated that Co²⁺ had incorporated into the spinel lattice. Moreover, the ground state absorption cross section of the best specimen was calculated with a value of 6.18×10^-19 cm² at 1540 nm, meaning that it’s a promising candidate for passive Q-switching in solid-state lasers.]]> http://www.jim.org.cn/EN/10.15541/jim20210030 in vitro mineralization of borosilicate bioactive glass to accelerate the bioactivity in the slower degradation phase. Borosilicate bioactive glass with the composition of 18SiO₂-6Na₂O-8K₂O-8MgO-22CaO-2P₂O₅-36B₂O₃, prepared by the melting method, was immersed in simulated body fluid (SBF). A current in range of 0-90 mA was applied to study the effect of DC electric field on the degradation and in vitro mineralization property of borosilicate bioactive glass. The results show that the application of electric field increases the degradation rate and ion release of borosilicate bioactive glass. Compared to the control group (without electric field), the weight loss rate increased by 3%-5% and the dissolution of B and Ca ions increased by 2.3-2.9 times and 1.9-2.3 times, respectively. Meanwhile, the electric field assists glass network hydrolysis and surface hydroxylation, accelerating the generation of hydroxyapatite (HA). Analyzing the surface structure of the borosilicate bioactive glass particles, we found that an apatite layer was formed on the surface of the sample exposed to the electric field. Hence, the application of a DC electric field can improve the degradation and in vitro mineralization property of bioactive glass, providing a new idea for bone repair effect enhancement.]]> http://www.jim.org.cn/EN/10.15541/jim20200663 http://www.jim.org.cn/EN/10.15541/jim20200653 2S is an attractive semiconductor due to its excellent physical and chemical property that enable it with wide applications in fields of catalysis, sensing, optoelectronics in past years. In present work,Ø18mm× 50 mmAg₂S ingot was successfully prepared using zone melting method and its potential thermoelectric (TE) behavior was investigated. Ag₂S has standard monoclinicP2₁/cspace group (α-Ag₂S phase) below 450 K and will transfer to cubic structure (β-Ag₂S phase) over this temperature. Ag₂S is an-type semiconductor as the Seebeck coefficientS is always negative due to the Ag interstitial ions in the material that can provide additional electrons. The S value is about -1200 µV·K^-1 near room temperature and will decline to -680 µV·K^-1 at 440 K and finally decreases to ~-100 µV·K^-1 at β-Ag₂S state. The electrical conductivityσ of α-Ag₂S is almost zero.However, the value sharply jumps to ~40000.5 S·m^-1 as the material just changes to β-Ag₂S and then gradually deceases to 33256.2 S·m^-1 at 650 K. Hall measurement demonstrates the carrier concentration n_H of Ag₂S is suddenly increased from the level of ~10¹⁷ cm^-3 to ~10¹⁸ cm^-3 during phase transition. The total thermal conductivity κof α-Ag₂S is ~0.20 W·m^-1·K^-1 and the value is ~0.45 W·m^-1·K^-1 to β-Ag₂S. Ultimately, a maximum ZT= 0.57 is achieved around 580 K that means Ag₂S might be a promising middle-temperature TE material.]]> http://www.jim.org.cn/EN/10.15541/jim20200623 12 (R=Tb, Dy, Ho, Er, Tm) are all characterized by a controversial and unresolved magnetic and specific-heat anomaly at low temperature (TC≈22-3K) except LuB₁₂ with closed f-shell. Although the bump feature in magnetic susceptibilities resembles that of antiferromagnetically ordered R³⁺ ions, no definite magnetic structure was identified by either neutron scattering or Mössbauer spectra. The anomalies in susceptibilities, entropy, and low temperature neutron diffraction pattern all pointed to the amplitude-modulated nature of complex magnetic structure. In view of the rather small crystal-field-splitting energies of the order of meV, we propose to treat crystal-field-splitting (CFS) energy as an order parameter rather than a quantum mechanical quantity. In this way, we show that not only the magnetic and specific-heat anomalies can be explained properly by a gradual quenching of R orbital moments, but also the low temperature satellite peaks of neutron scattering spectra can be understood in terms of the spontaneously (111) dimerised structure and inelastically absorbed rattling phonon modes.]]> http://www.jim.org.cn/EN/10.15541/jim20200544 2O₂S scintillators are the new type of oxysulfide scintillators, which have been developed since 1980s. The Gd₂O₂S matrix with high density and high thermal neutron absorption cross section has high X ray and thermal neutron stopping ability. The doping of different rare earth ions (Pr³⁺,Tb³⁺, etc.) shows fast decay or high light yield, which plays a very important role in the application of scintillation. The composition control of oxysulfide is always the key problem to be solved in the synthesis process. However, the high melting point of Gd₂O₂S material and the serious volatilization of sulfur restrict the preparation of Gd₂O₂S single crystals, with high optical quality and excellent scintillation performance. Ceramic is the main application form of Gd₂O₂S scintillation material. The pure phase Gd₂O₂S phosphors with small particle size, narrow particle size distribution and low agglomeration is the key to sintering high quality scintillation ceramics. The Gd₂O₂S scintillation ceramics prepared by simply increasing the sintering temperature will produce a large number of sulfur vacancies and oxygen vacancies, which will reduce the scintillation properties of the materials. So the preparation of Gd₂O₂S scintillation ceramics usually need pressure assistance, which increases the production cost. In this paper, the scintillation mechanism and the research situation of scintillators are introduced firstly. Then, the fabrication process of Gd₂O₂S scintillation ceramics, the solution of defects removal, the research status and their applications in neutron imaging and medical X-CT fields are overviews. Finally, The whole paper is summarized and the development of Gd₂O₂S scintillation ceramics is also prospected.]]> http://www.jim.org.cn/EN/10.15541/jim20200705 2-MgO as sintering additive. The effect of YbH₂-MgO on shrinkage behavior, phase composition, microstructure, thermal conductivity, and flexural strength was investigated. The nitrogen-riched and oxygen-lacked oxynitride liquid phase was generated owing to the elimination of SiO₂ by YbH₂. Both the removal of lattice oxygen and the growth of β-Si₃N₄ were stimulated by the liquid phase. Therefore, compared to Yb₂O₃-MgOdoped sample, silicon nitride with enlarged grains, purified lattice and reduced intergranular phase was obtained. Ultimately, the thermal conductivity increased by 13.7% from 115.32 to 131.15 W·m^-1·K^-1 after sintering at 1900 鈩� for 24 h by substituting Yb₂O₃ with YbH₂.Although the replacement of Yb₂O₃ by YbH₂ leads to enhanced flexural strength at low temperature, it tends to reduce the flexural strength at high temperature. The optimal flexural strength of (1008±35)MPa was achieved after sintering at 1800 鈩� for 4 h.This variation related mainly to the exaggerated bimodal microstructure. This work signifies that YbH₂-MgOis effective for obtainingSi₃N₄ ceramics with both high flexural strength and high thermal conductivity.]]> http://www.jim.org.cn/EN/10.15541/jim20200695 http://www.jim.org.cn/EN/10.15541/jim20200661 α)) are established by considering the nonlinear characteristics of the data and equal dimensional information substitution method. The model is used to predict the experimental data of photocatalytic degradation of tetracycline by Bi/BiOCl/Au. As compared with DGM(1, 1) and other three models, the EDGM(1, 1, α) model has a better prediction level for the experimental data of photocatalysis. The results are in good agreement with the experimental results. This model can be used to guide the next step of experiments, which is expected to reduce the number of experiments and realize the rapid development of experimental research with low cost and energy consumption.]]> http://www.jim.org.cn/EN/10.15541/jim20200652 3Al₅O₁₂) and nitrogen/oxynitridephosphor ceramics are reviewed mainly. Finally, the development of phosphor ceramics for high-power solid-state lightingisprospected.]]> http://www.jim.org.cn/EN/10.15541/jim20200594 3 (BFO) is a novel recyclable photocatalystwhich benefits from its appropriate theoretical band gap and room temperature ferromagnetism, yet the relatively high recombination rate of photogenerated electron-hole pairs and low quantum yield limit its practical catalytic performance. Here, a composite material of reduced graphene oxide and BiFeO₃ nanocrystals (RGO-BFO) was successfully prepared via a hydrothermal self-assembly processwith about 10wt% RGO loaded 85wt% BFO nanocrystalline (~10 nm). The specific surface area of the composite is about 5 times ofthat of pure BFO particles.And more, this nanocompositedemonstrates theenhanced ultraviolet absorption behavior as well as its intrinsic visible light absorption, with an energy gap (E_g) of 2.0 eV, which is about 10% lower than BFO particles(2.3 eV). As a result, a significantly higher catalytic efficiency of nearly 100% of the RGO-BFOwas obtained as compared to the 25% value of BFO after a 40-min process of adsorption and photodegradationfor Methylene Blue.The improved performancesmay be attributed to the additional photogenerated electron-hole pairs and lower recombination ratio, which can be proved by the result ofphotoelectric response. As an intrinsically ferromagnetic material, itcould be easily recycled from the solvent system, and itsrepetitivecatalytic efficiencymaintained 89.1% after 6 cycles, showing a good catalytic stability.]]> http://www.jim.org.cn/EN/10.15541/jim20210029 2AlC coatings for the applications in accident tolerant fuels, the oxidation of near-stoichiometric and Al-lean Ti₂AlC was investigated in Ar-41% H₂O atmosphere at 1000~1200 鈩�. The oxidation kinetics of phase-pure Ti₂AlC in high-temperature water vaporvaried from parabolic to linear rate law with decreasing Al content.Insufficient Al content could not sustain the growth of continuous alumina scales, resulting in the formation of thick unprotective TiO₂-based scales. The formation of thin and protective Al₂O₃scale for Ti₂AlCwith stoichiometric composition effectively inhibited the inward diffusion of water vapor. For the application of protective coatings on Zr-based cladding, stoichiometric Ti₂AlC is expected to protect cladding from fast oxidation and improve the accident tolerance in the current light water reactors.]]> http://www.jim.org.cn/EN/10.15541/jim20210020 st-order exponential decay equations. By 1500 U/mL HAase solutions, the composites degraded 95% after only 2 minand dispersed rapidly,showing good enzymatic degradability. HAP was demonstrated not only endowing the composite hydrogels with better plasticity for facial soft tissue filler and contour modification, but also providing good microenvironmentfor attachment and proliferation of fibroblasts. Therefore, the as-prepared HA-HAP compositecould be used as a long-acting filler for remodeling extracellular matrix, and thus potentially applied in cosmetic medicine.]]> http://www.jim.org.cn/EN/10.15541/jim20200721 http://www.jim.org.cn/EN/10.15541/jim20200675 2/NiO composite semiconductor nanofibers with different Sn contents were prepared by electrospinning combined with chemical precipitation and high temperature calcination. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray spectrometer (EDS) were used to characterize the morphology, structure and elemental content of the samples. Taking ethanol as the target gas, the gas sensing properties of SnO₂/NiO nanofibers and the influence of Sn content on the gas sensing properties of the composite nanofibers were investigated. The results show that the SnO₂/NiO composite nanofibers have a three-dimensional network structure, and SnO₂ composite can significantly enhance the gas sensing properties of NiO nanofibers. With the increase of SnO₂ content in composite fibers, the responseof samples to ethanol is enhanced. Among them, the SnO₂/NiO nanofibers with the highestsensitivityshow response value of 13.4to 100×10^-6 ethanol(volume fraction) at the optimum working temperature of 160鈩�.The maximum response value of the SnO₂/NiO nanofibers exhibit 8.38 times enhancement compared to that of NiO nanofibers. Compared with MQ-3, a commonly used ethanol sensor on the market, the SnO₂/NiO composite nanofibers have lower optimal working temperature and higher response sensitivity, which showsgreatpotentialinpractical application.]]> http://www.jim.org.cn/EN/10.15541/jim20200664 2+. The low doping efficiency of copper is caused by its complexation with ammonia in synthetic solution, while silicon and selenium are caused by different geometry and charge of SiO₃^2-, SeO₃^2- from that of PO₄^3-). This study reveals the reasonable relationship between doping behavior and ion characteristics, providing a useful reference for the design and development of functionalized hydroxyapatite.]]> http://www.jim.org.cn/EN/10.15541/jim20200635 2Se₃can improve the power factor and reduce thermal conductivity of PbTe, respectively. Optimization of band structures and enhancement of phonon scattering were realized by means of expanding band gap, producing point defects and secondary dispersoids. As a result, the merit of figureZTwas remarkably improved. In particular, (PbTe)_0.94(PbS)_0.05(Sb₂Se₃)_0.01 exhibited the highest value of ZT=1.7 at 700 K simultaneously withalmost doubled average ZTcompared to the pristine PbTe. Accordingly, it seems that the stepwise addition of adequate dualcomponents provides possible technological approach for improving thermoelectric performance of other materials.]]> http://www.jim.org.cn/EN/10.15541/jim20200576 4Ti₅O₁₂ anodes are coated with amorphous lithium phosphate by radio frequency (RF) magnetron sputtering. The characterized morphology indicates that the electrodes are covered by a thin amorphous lithium phosphate coating layer, showing a very smooth surface. Both the rate performance and cycle performance of the electrodes are enhanced markedly by the coating layer in the voltage range of 0.01-3 V. When the discharge-charge currents are 35 and 1750 mA∙g^-1, the capacities are elevated to 265 and 151 mAh∙g^-1, which are higher than those of the uncoated one (240 and 22 mAh∙g^-1). After further discharge-charged for 200 cycles at 88 mA∙g^-1, the coated electrodes still maintain a high reversible capacity of 238 mAh∙g^-1. This result clearly suggests that the thin layer can stabilize the solid electrolyte interface, maintain the integrity of the interparticle electronic passage and form a cross-linked ionic conducting network for Li₄Ti₅O₁₂ grains on the surface.]]> http://www.jim.org.cn/EN/10.15541/jim20200522 0.8Mn_0.2O₂ materials were prepared through microwave-assisted co-precipitation followed by high-temperature solid-phase method, which can be further modified by doping different proportions of Co and Al. The as-prepared materials are characterized and tested with different methods. As a result, LiNi_0.8Mn_0.1Co_0.08Al_0.02O₂ (NMCA-2) exhibits the best electrochemical performance, whose capacity retention rate reaches 91.39% after 100 cycles at 1Cin the voltage range between 2.75 and 4.35V, and still owns a specific discharge capacity of 160.03 mAh∙g^-1 at 5C. Its excellent cyclic retention rate can be attributed to the restrained irreversibility of H2→H3 phase transition during cycling with Co and Al doping, andthe lower reaction polarization which contributed to the decline of charge transfer resistance, resulting in good cycle and rate performance of the material.Furthermore, high thermal stability of NMCA-2 improves the safety of the material.]]> http://www.jim.org.cn/EN/10.15541/jim20200512 -1, the adsorption isothermal was in accordance withthe Langmuir model, and the theoretical maximum adsorption capacity was 65.359 mg·g^-1. The adsorption kinetics could be fitted well with the pseudo-second-order kinetics equation, and adsorption behavior was an exothermic and spontaneous process. XPS analysis showed that the main adsorption mechanism of the adsorbent was the ligand exchange between hydroxyl groups linked with La/Fe and HEDP.]]> http://www.jim.org.cn/EN/10.15541/jim20200657 http://www.jim.org.cn/EN/10.15541/jim20200639 -3), and the water absorption is as low as 0.53%. This study systematically explores the problems and solutions of AlN filler in the application of CCL, which has guiding significance for its practical application.]]> http://www.jim.org.cn/EN/10.15541/jim20200624 http://www.jim.org.cn/EN/10.15541/jim20200582 http://www.jim.org.cn/EN/10.15541/jim20200632 2/g and the maximal total pore volume of 3.164 cm³/g, which are significantly superior to those of the commercial activated carbon (YP-80, the specific surface area of 1310 m²/g and the total pore volume of 0.816 cm³/g, respectively). The highest maximum adsorption capacity for methylene blue was found for the activated carbon with the largest specific surface area, namely, 983 mg/g, which is almost twice as high as that of YP-80 (525 mg/g). By adsorption kinetics fitting, the results are consistent with pseudo-second-order model which indicates that the process of adsorbing methylene blue is chemical adsorption.]]> http://www.jim.org.cn/EN/10.15541/jim20200621 in-situ observationare two major difficultiesin the research of fracture resistance of ceramic materials. In this study, amethodof strain-induced cracking was proposed, in which the plate was bonded to a brass beam to form a composite. The bending deformation of brass beam derivedthe tension deformation in the tension zone of ceramic thin plate toinduce the controllable crack. Four-point bending test was conducted under a tool microscope to performin-situ observation of crack propagation. The initial crack length was controlled by adjusting the width of the tensile zone of the ceramic plate. After the initiation of the crack, loading was continued to make the crack length meet the requirements of fracture toughness test for ceramics. Compared with the standard test of fracture toughness of block materials, the above method is simple and reliable. The strain-induced method to pre-crack has high success rate, the position of crack initiation and length of the pre-crack are controllable and easy to operate.It can be widely applied to fracture toughness evaluation and crack propagation resistance analysis of ultra-thin glass and other ultra-thin brittle materials.]]> http://www.jim.org.cn/EN/10.15541/jim20200555 http://www.jim.org.cn/EN/10.15541/jim20200525 +, but also has enough voids to accommodate the volume change on Li⁺ insertion and extraction. Benefiting from the abundant internal porosity and the high-strength outer carbon film of the three-dimensional porous structure, the obtained 3D-bio-Si/C shows remarkable electrochemical performance. This 3D-bio-Si/Ccan deliver reversible specific capacity of 1243.2 mAh/g at a current density of 1 A/g, and maintain 933.4 mAh/gafter 400 cycles. This low-cost, scalable, green and sustainable route to high-performance silicon-based anode material derived from Equisetum fluviatile lays a foundation for the commercial preparation of Si based lithium-ion battery anode materials.]]> http://www.jim.org.cn/EN/10.15541/jim20200507 1/2 in 锛�110锛� crystal direction which is sensitive to the crack propagation.]]> http://www.jim.org.cn/EN/10.15541/jim20200437 2MoO₆ composite catalyst (Fe(III)/rGO/Bi₂MoO₆) was prepared by solvothermal method, and the photocatalysis-Fenton synergy system wasconstructed by adding H₂O₂. The phenol solution can be completely degraded aftervisible light irradiationfor 3 h, and the synergy degradation efficiency is 5.56 and 2.08 times that of pure photocatalysis andFenton reaction, respectively. This can be mainly attributed to the transformation of the valence state through the gain and loss of Fe electrons,which serves as a bridge to realize the photocatalysis-Fenton synergy. Meanwhile, the excellent electrical conductivity of graphene overcomes the difficulty of separating photo-generated electron holes in photocatalysis, and promotes the cyclic reaction of Fe³⁺/Fe²⁺, and then accelerates the Fenon reaction to produce more free hydroxyl groups (·OH), which further improves the degradation efficiency of phenol. The effects of Fe(III) content, catalyst dosage, H₂O₂ content and pH on the synergy degradation performance wereinvestigated. The quenching experiment proves that ·OH isthe main active species in the degradation system, meanwhile, ·O₂^- and h⁺ also havea certain effect on the degradation activity. The Fe(III)/rGO/Bi₂MoO₆ photocatalysis-Fenton synergy degradation mechanism is also proposed based on the experimental results.]]> http://www.jim.org.cn/EN/10.15541/jim20200033 -1 KOH electrolyte, the electrochemical performance significantly improves after doping. CNT-N/S presents a high specific capacity of 172.0 F·g^-1 at current density of 1 A·g^-1, higher than those of CNT (62.2 F·g^-1) and CNT-N (97.0 F·g^-1). The capacitance of the N/S doped carbon nanotubes remains 89% after 1000 charge-discharge cycles. Furthermore, the assembled symmetrical supercapacitor also shows good capacitance performance.]]> http://www.jim.org.cn/EN/10.15541/jim20200540 2 thin films mainly focus on mechanical exfoliation and chemical vapor deposition. In this study, we report a simple and efficient method to fabricate PdSe₂ thin films on SiO₂/Si substrates. First, a Pd metal layer was deposited on a SiO₂/Si substrate using magnetron sputtering. Then the PdSe₂ thin film was obtained by a selenization of the Pd layer at certain temperatures in a vacuum quartz ampule containing Se powder. According to the cross-sectional high-resolution transmission electron microscopy (HRTEM) image, the as-grown PdSe₂ thin film has an average thickness of approximately 30 nm. The correlation between selenization temperature and electronic transport properties of PdSe₂ thin filmshas been investigated. PdSe₂ thin films with a hole carrier concentration of ~10¹⁸ cm^-3 and a mobility of ~48.5 cm²·V^-1·s^-1 have been realized at a low selenization temperature of 300鈩�. It is worth noting that the mobility obtained by the vacuum selenization is superior to that of the p-type PdSe₂ thin films fabricated by mechanical exfoliation from bulk PdSe₂ single crystals. In addition, a relatively large room-temperature magnetoresistance (MR) of 12% was achieved for the PdSe₂ thin films selenized at 300鈩�. With the increase in the selenization temperature from 300鈩�, mobility and magnetoresistance decrease due to the evaporation of Se elementat high temperatures. Our work demonstrates that the one-step selenization process is a facile and efficient approach to synthesize PdSe₂ films, which could actually be used to prepare PdSe₂ films in a large scale and may have potential applications for next-generation electronic and magneto-electronic devices.]]> http://www.jim.org.cn/EN/10.15541/jim20200538 3Sb₂ compound has attracted much attention due to the promising thermoelectric properties and cost advantage. However, it is quite difficult to control Mg content duringsynthesizing processes because of high saturation vapor pressure and chemical reactivity of Mg element. Herein, Mg_3(1+z)Sb₂ (z=0, 0.02, 0.04, 0.06 and 0.08) samples were prepared by thecombination of solid state reaction, ball milling and spark plasma sintering (SPS). The effects of Mg content on thermoelectric properties of Mg₃Sb₂ compounds were investigated in this study. Results indicate that actual Mg content rises with nominal Mg content increasing, and the point defect type changes from Mg vacancy(VMg’’) to interstitial Mg(Mgi··), leading to the transition of transport behavior from ptype (hole carriers predominating) for Mg_3(1+z)Sb₂ (z=0, 0.02, 0.04) samplesto ntype (electron carriers predominating) for Mg_3(1+z)Sb₂ (z=0.06, 0.08) samples. Besides, Mg_3(1+0.04)Sb₂ sample shows the highest ZT value from room temperatureto 770 K, and maximum ZT of 0.28 is achievedat 800K. Additionally, Mg_3(1+0.04)Sb₂ sample exhibits intrinsic p-type transport behavior for Mg₃Sb₂ compound, which could serve as matrix to be extrinsically doped in the future study for further improvements ofelectrical properties and ZT value.]]> http://www.jim.org.cn/EN/10.15541/jim20200534 2 with a layered structure, binary solid solution of the transition metal layer can effectively improvethe electrochemical performance of the electrode material. In this study,the structural model of Na_x[Mg_1/3Mn_2/3]O₂with Mg ion solid solution was constructed by using the Coulombic model. First-principles calculations revealed that the discharge voltage of Na_x[Mg_1/3Mn_2/3]O₂reached 3.0 V at a sodium ion content of less than 2/3. The electronic density of states and charge population analysis showed that the solid solution of Mg motivated the anionic electrochemical activity of lattice oxygen in the P2-phase Na_x[Mg_1/3Mn_2/3]O₂, which transformed the electrochemical reaction mechanism of the system from cationic and anionic synergic redox reaction to reversible anionic redox reaction. This mechanism provides a novel method for the design of electrode materials for Na ion batteries, as well as a new approach for the optimization and exploration of other ion batteries.]]> http://www.jim.org.cn/EN/10.15541/jim20200509 3 concentration, etching time and etching current on the morphology of the composite structure were investigated. The fieldemission characteristics of the structure prepared by electrocatalytic metalassisted chemical etching were tested. The current density is 64 μA/cm² under theelectric fieldof14.16 V/μm, and threshold electric field is10.83 V/μm.]]> http://www.jim.org.cn/EN/10.15541/jim20200475 3+-doped Y₃Al₅O₁₂(Yb:YAG) SCFs (Ф0.2×710 mm³), which were grown by a self-developed laser-heated pedestal growth (LHPG) apparatus. The prepared SCFs possess a length-to-diameter ratio greater than 3500, a diameter fluctuation less than 5%, and show high flexibility for bending. The analysis of X-ray rocking curveindicates that the crystallinity of the grown SCF is improved compared with that of the source rod.The EDS line scan shows that the Yb³⁺ions are uniformly distributed along the axial direction. The results of these characterizations of SCFs indicate that SCFs maintains excellent crystallinity and high optical homogeneity, thus are promising candidate for high-power laser applications.]]> http://www.jim.org.cn/EN/10.15541/jim20200443 in vivo and makes the nano materials spontaneously form stable structures based on the noncovalent bond interaction, has become one of the main methods to prepare nano materials. This paper reviews the different biomimetic self-assembly synthesis strategies for nanomaterials in morphology and performance control.The characteristics of biomimetic self-assembled nanomaterials are summarized. This paper also introduced the application of self-assembly technology in sensors, surface Raman scattering, biomedical and other fields. In addition, the prospects for the development of biomimetic self-assembly technology of nanomaterials are prospected.]]> http://www.jim.org.cn/EN/10.15541/jim20200529 2SnC MAX phase via molten salt method. Phase composition and microstructure of Sc₂SnC were confirmed by X-ray diffraction, scanning electron microscope and X-ray energy spectrum analysis. And, the structural stability, lattice parameters, mechanical and electronic properties of Sc₂SnC were investigated via density functional theory. The theoretical results show that Sc₂SnC is thermodynamically stable, and the Sc₂SnC is metallic in nature where the contribution from Sc-3d states dominates the electronic conductivity at the Fermi level. This study provides a route to explore more unknown ternary layered rare earth compounds Re_n+1SnC_n (Re=Sc, Y, La-Nd, n=1) and corresponding rare earth MXenes.]]> http://www.jim.org.cn/EN/10.15541/jim20200506 -1)released from Mo-Cup had a good inhibitory effect on Staphylococcus aureus.In addition,because the antagonistic effect between copper and molybdenum ions released from Mo-Cupcan reduce the cytotoxicity of high concentration of copper ions, the survival rate of umbilical vein endothelial cells (HUVECs) was as high as 90% in the extracts of Mo-Cupat a high Cu ion concentration (9.65 μg∙mL^-1). Therefore, molybdenum doping can be considered asan effective approach to reduce the cytotoxicity of copper-containing biomaterials for the development of low-toxic antibacterial biomaterials.]]> http://www.jim.org.cn/EN/10.15541/jim20200498 3?g^-1 and broad pore size distribution of 0.5-60 nm. Thus, the N-rich carbon material harvests high capacitance of 302F?g^-1 at 1 A?g^-1 and excellent rate capability of 177 F?g^-1 at 120 A?g^-1. This unique nitrogen fixation method is a promising strategy for preparing high performance electrode materials of supercapacitors.]]> http://www.jim.org.cn/EN/10.15541/jim20200495 L-3-(4-pyridyl)-alanine (PLA)) wasintroduced in the preparation of perovskitephotoabsorption layerby two-step solution method. The characterization showed that the introduction of PLA could comprehensively improve the photoelectric performance of the device, and the optimal energy conversion efficiency of the device withPLA was 21.53%, while that of the reference device was 20.10% in comparison. Further studies showed that the introduction of PLA could reduce the trap state density of the device from 5.59×10¹⁶ cm^-3 to 3.40×10¹⁶ cm^-3, promote the interface charge extraction, and reduce the carrier recombination. The above improvementscanbe attributedto the PLA induced PbI₂ enrichment at grain boundaries and PLA anchoring at defects, which play animportant rolestopassivate defects. This study can provide guidelineto further regulate the defects of perovskite solar cells.]]> http://www.jim.org.cn/EN/10.15541/jim20200450 -1, reaction temperature of 35 鈩僡nd reaction time of 1 h.The Nd-Ni-B/NF electrode requires an overpotential of only 180 mV to achieve the current density of 20 mA∙cm^-2 in 1.0 mol∙L^-1 KOH solution, and the corresponding Tafel slope is 117 mV∙dec^-1.The HER of Nd-Ni-B/NF catalyst is controlled by the Volmer-Heyrovsky step. Moreover, the Nd-Ni-B/NF shows superior electrochemical stability, 12 hchronoamperometry and 2000sweepsof cyclic voltammetry were conducted and no obvious activity decay was observed锛嶿]> http://www.jim.org.cn/EN/10.15541/jim20200440 xHf_1-xC solid solution ceramics have been considered as the promising candidates for many important applications which can tolerate temperature above 3000 K due to their high melting point, high hardness, low coefficient of thermal expansion, good resistance to oxidation and ablation. In this paper, the research progress of Ta_xHf_1-xC solid solution ceramics was introduced in terms of preparation methods, microstructure, thermophysical properties, mechanical properties at room temperature, oxidation and ablation resistance. Furthermore, the relationship between the composition, structure and properties of Ta_xHf_1-xC solid solution ceramics was discussed. The remaining challenges and future outlook of Ta_xHf_1-xC solid solution ceramics were also addressed.]]> http://www.jim.org.cn/EN/10.15541/jim20200404 http://www.jim.org.cn/EN/10.15541/jim20200356 5O₇I composites. The photocatalyst was prepared by a simplehydrothermal method, and characterized by different methods. Compared to pure Bi5O7I microrods and CuS nanoparticles, the as-prepared CuS/Bi₅O₇I composites exhibits more efficient photocatalytic reduction of aqueous Cr(VI). The reaction rate constant of 15wt% CuS/Bi₅O₇I catalyst was 20 times and 4.3 times of that of pristine Bi₅O₇I and CuS, respectively. BET, photoluminescence and EIS spectra measurement demonstrate that the improved photocatalytic activity may be attributed to the higher surface areas, broader light absorption region, improved separation and transfer efficiency of photo-induced electron-hole pairs. Moreover, a possible photocatalytic mechanism of CuS/ Bi₅O₇I catalyst is also proposed.]]> http://www.jim.org.cn/EN/10.15541/jim20200508 2O₃/Er₃Al₅O₁₂(ErAG) and Al₂O₃/Yb₃Al₅O₁₂(YbAG) eutectic rods with fine and homogeneous microstructure, free from cracks or pores, were directionally solidified using optical floating zone method at growth rate of 10 mm/h. The crystallographic orientation, preferred orientation, and 3D distribution of Al₂O₃ and Er₃Al₅O₁₂/Yb₃Al₅O₁₂ phases in the terminal growth zone of Al₂O₃/ErAG and Al₂O₃/YbAG eutectics were investigated by EBSD and high-resolution X-ray microscope. Vickers hardness of the as prepared Al₂O₃/ErAG and Al₂O₃/YbAG eutectics are determined as (13.5±0.4) GPa and (12.8±0.1) GPa, respectively. The fracture toughness results of Al₂O₃/ErAG and Al₂O₃/YbAG are (3.0±0.2) MPa·m^1/2 and (3.2±0.1) MPa·m^1/2, respectively.]]> http://www.jim.org.cn/EN/10.15541/jim20200499 http://www.jim.org.cn/EN/10.15541/jim20200484 2+ concentration of SBF were adjusted. The mineralized products of BBG bone cement after being immersed in different SBF solutionswere characterized. It is found that the effects of amino acids on mineralization products are quite different, of which aspartic acid and lysine affect the aspect ratio ofthe mineral, but glycine does not affect the morphology of the mineral. After being immersed the borosilicate bioactive glass tablet in an acidic (pH 3.5) SBF solution with a high Mg²⁺ content at 70°C for a certain period, HA/WH complex mineral can be obtained.]]> http://www.jim.org.cn/EN/10.15541/jim20200361 http://www.jim.org.cn/EN/10.15541/jim20200357 0.4Zr_0.5La_0.05Pr_0.05O₂ (Pt/CZ) TWCs were prepared by two different alkali-assisted deposition precipitation method, urea or ammonia. The effects of different alkali-assisted on the physicochemical properties, catalytic activity and durability were analyzed. It was found that the Pt/CZ catalyst prepared by urea-assisted deposition precipitation method (UDP)has poor aging resistance but the Pt/CZ catalyst prepared by ammonia-assisted (ADP) showedbetter anti-aging ability. Based on the results of XRD, CO adsorption, XPS and H₂-TPR, thecomparatively larger particle size of Pt species and stronger interaction for ADP makethe ADP more difficult to sinter together duing the aging treatment, which is favorable for maintaining catalytic activity. Therefore, the ADP catalyst has a bright future for industrialization.]]> http://www.jim.org.cn/EN/10.15541/jim0200396 3 spheres as green template and polydoamine as nitrogen and carbon sources was reported. The morphology and structure of the samples were characterized. Using TMB (3,3,5,5' tetramethylbenzidine) as a substrate, UV sectrohotometry was used to investigate its oxidase-like activity and catalytic mechanism. The results showed that N-HCSs displayed oxidase-like activity. The oxidase-like activity of N-HCSs was increased by three times after activation by KOH. These enzymes conform to the Michaelis-Menten kinetic equation, and the K_m constant before and after activation were 0.1094 and 0.0825, respectively, indicating good affinity for substrates. The data demonstrated that it is superoxide anion (O₂•^-) that plays a major role in catalytic reaction. All these data provides a theoretical basis for the design and preparation of high activity oxidase-mimicking enzymes.]]> http://www.jim.org.cn/EN/10.15541/jim20200347 etc.However, there still exist some problems,such as low removal efficiency, poor stability,and single removalon account ofseveral self-defects of agglomeration and tedious structures. Hence, this review focuses on the following aspects: (1) the controllablepreparation of iron nanoparticles; (2) theinterface design of iron composites; (3) the application of iron nanoparticles in heavy metalsremoval andelectrocatalytic denitrification; (4) the prospect of iron nanoparticles composites in environmental remediation.]]> http://www.jim.org.cn/EN/10.15541/jim20200266 in situ growth, multistep seeded growth and atomic layer depositionare described in detail. The main application and of current MOFs NFMs, such as adsorption and separation, heterogeneous catalysis, sensing detectionare expounded.And, we put forward the future prospect of the development direction and trend of MOFs NFMs.]]>