Solvothermal Synthesis and Morphological Control of TiO2 Nanorods Modified with Oleic Acid

doi:10.15541/jim20160588

Abstract

Abstract:

TiO₂ nanorods were prepared by solvothermal method in two reaction systems. The structure, morphology and surface modification state of the as-obtained nanorods were characterized by X-ray diffractometer (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and thermalgravimetric method (TG). The results indicate that the surface modification and crystallization process are the main factors that affect the morphology of TiO₂ nanorods. In the nonaqueous reaction system, the aspect ratio of as-prepared TiO₂ nanorods increase to 11.5 with the mole ratio of tetrabutyl titanate to oleic acid at 1: 10, which is 2.3 times of that obtained in the hydrolyzation system under the same ratio of reactants. The reason for this phenomenon is that the selective adsorption of oleic acid on the surface of TiO₂ limits the one-dimensional orientation growth of crystals. The aspect ratio of TiO₂ nanorods can be enhanced by increasing the amount of oleic acid. Furthermore, nonaqueous reaction facilitates the adequate growth of crystals and the oriented attachment of nanorods due to its lower reaction velocity, leading to the significant increase of aspect ratio of nanorods. The as-obtained nanorods with the optimum aspect ratio exhibit good modification effect on the positive impulse breakdown strength of transformer oil.

Key words: TiO₂ nanorods, surface modification, crystallization process, morphological control, oriented attachment

CLC Number:

TQ174

LV Yu-Zhen, SUN Qian, LI Chao, SHAN Bing-Liang, QI Bo, LI Cheng-Rong. Solvothermal Synthesis and Morphological Control of TiO₂ Nanorods Modified with Oleic Acid[J]. Journal of Inorganic Materials, 2017, 32(7): 719-724.

Figures/Tables 7

Fig. 1 XRD patterns of products prepared from two reaction systems (TB︰OA=1︰10)(a) Hydrolyzation system; (b) Nonaqueous system

Fig. 2 TEM images of TiO2 nanorods prepared from two reaction systems with different ratios of TB to OA(a-d) Hydrolyzation system 1︰4, 1︰8, 1︰10, 1︰16; (e-h) Nonaqueous system 1︰4, 1︰8, 1︰10, 1︰16

Table 1 Aspect ratio of TiO2 nanorods obtained from two reaction systems

Molar ratio of TB︰OA	Aspect ratio
Molar ratio of TB︰OA	Hydrolyzation system	Nonaqueous system
1︰4	3.1	4.9
1︰8	4.0	7.7
1︰10	5.1	11.5
1︰16	5.3	10.6

Fig. 3 FTIR patterns of TiO2 nanorods prepared from two reaction systems (TB︰OA=1︰10)(a) Hydrolyzation system; (b) Nonaqueous system

Fig. 4 TG curves of TiO2 nanorods prepared in two reaction systems (TB︰OA=1︰10)(a) Hydrolyzation system; (b) Nonaqueous system

Fig. 5 HRTEM images of TiO2 nanorods prepared in two reaction systems (TB︰OA=1︰10)(a) Nonaqueous system; (b) Hydrolyzation system

Fig. 6 Test results for positive lightning breakdown strength of pure oil and nanofluid

References 20

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Solvothermal Synthesis and Morphological Control of TiO₂ Nanorods Modified with Oleic Acid

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