液相法合成针状镁铝水滑石纳米晶的研究

无机材料学报

液相法合成针状镁铝水滑石纳米晶的研究

任庆利^1,2; 陈维¹; 罗强³

1. 西安交通大学电力设备电气绝缘国家重点实验室, 西安 710049; 2. 西安电子科技大学, 西安 710071; 3. 第二炮兵工程学院, 西安 710025

收稿日期:2003-08-18 修回日期:2003-10-13 出版日期:2004-09-20 网络出版日期:2004-09-20

Preparation of Acicular Nanocrystalline Mg,Al-hydrotalcite by LiquidMethod

REN Qing-Li^1,2; CHEN Wei¹; LUO Qiang³

1. State Key Laboratory of Electrical Insulation for Power Equipment; Xi an Jiaotong University; Xi an 710049; China; 2. Xidian University; Xi an 710071, China; 3. The Second Artillery Institute of Engineering; Xi an 710025; China

Received:2003-08-18 Revised:2003-10-13 Published:2004-09-20 Online:2004-09-20

摘要/Abstract

摘要： 研究了合成条件(原料种类、加料次序、NaOH浓度和合成温度)对液相法制备镁铝水滑石试样的相组成的影响.以MgCl₂为镁源、NaAlO₂为铝源、NaCO₃和NaOH为沉淀剂,在常压下采用液相法制备了长度约100nm、直径约10nm的Mg₆Al₂(OH)₁₆CO₃-4H₂O针状纳米晶体.并且发现:可溶性原料的选取、最后加入MgC_l2的加料次序、>45℃的合成温度和保证反应溶液的pH>12,是瞬间生成镁铝水滑石纳米晶的充分必要条件.提出镁铝水滑石纳米晶核形成的过程是:均匀分布于溶液中的Al₁₃(OH)₃₂⁷⁺迅速吸附于带羟基OH-的无定型态的Mg(OH)₂表面,并进行Al³⁺扩散,为平衡电价,CO₃^2-也扩散进入Mg(OH)₂,从而在瞬间完成镁铝水滑石晶核的形成.

关键词: 镁铝水滑石, 制备工艺, 合成机理, 纳米晶体

Abstract: The acicular nanocrystalline Mg, Al-hydrotalcite flame-retardant agent, its length being about 100nm and its
diameter being about 10nm, was prepared by the liquid method at normal atmosphere. The effect of preparation technology, which includes the raw
material choice, adding raw material sequence, NaOH concentration, and nucleation temperature, on its phase composition was discussed. And it is
found that the sufficient condition of obtaining nanocrystalline Mg, Al-hydrotalcite is as follows: (1) raw materials must be solubility; (2)
pH value of the reaction solution must be greater than 12; (3) the nucleation temperature must be higher than 45℃; and (4) the adding raw
material sequence must be that adding raw material MgCl₂ follows the other three raw materials. Moreover, it is put forward that the nucleation
process of nanocrystalline Mg,Al-hydrotalcite is as follows: firstly, Al₁₃(OH)₃₂⁷⁺ ions are attracted on the surface of amorphous
Mg(OH)₂ and Al³⁺ ions diffuse in the Mg(OH)₂; secondly, CO₃^2- is inserted in the framework for the balance of the electron valence;
finally, the nucleation of nanocrystalline Mg,Al-hydrotalcite is quickly finished.

Key words: Mg, Al-hydrotalcite, preparation technology, reaction mechanism, nanocrystalline

中图分类号:

TB383

任庆利,陈维,罗强. 液相法合成针状镁铝水滑石纳米晶的研究[J]. 无机材料学报.

REN Qing-Li,CHEN Wei,LUO Qiang. Preparation of Acicular Nanocrystalline Mg,Al-hydrotalcite by LiquidMethod[J]. Journal of Inorganic Materials.

[1]	陈磊,王恺,苏文韬,张文,徐晨光,王玉金,周玉. 过渡金属非氧化物高熵陶瓷的研究进展[J]. 无机材料学报, 2020, 35(7): 748-758.
[2]	龙佩青, 刘希涛, 易志国. 制备工艺对(Ba_0.85Ca_0.15)(Ti_0.9Zr_0.1)O₃无铅压电陶瓷结构与性能的影响[J]. 无机材料学报, 2017, 32(3): 299-304.
[3]	王洪达, 周海军, 董绍明, 王震, 胡建宝, 冯倩. SiC_f/SiC复合材料耐高温氟熔盐腐蚀性能研究[J]. 无机材料学报, 2017, 32(11): 1133-1140.
[4]	张耀君, 杨梦阳, 康乐, 张力, 张科. 一类新型碱激发胶凝材料催化剂的研究进展[J]. 无机材料学报, 2016, 31(3): 225-233.
[5]	赵军胜, 屈树新, 黄萍, 刘宗光, 王铈汶, 翁杰. 纳米晶体纤维素增强磷酸钙骨水泥的研究[J]. 无机材料学报, 2015, 30(3): 318-324.
[6]	王娟娟, 张勇, 孔江榕, 邓长生, 徐景明. 固体氧化物电解池铁酸锶镧基复合阳极的制备及性能研究[J]. 无机材料学报, 2010, 25(9): 979-982.
[7]	王善禹, 谢文杰, 唐新峰. 制备工艺对n型Bi₂Te₃基材料热电性能和抗压强度的影响[J]. 无机材料学报, 2010, 25(6): 609-614.
[8]	王永在. 纳米晶Mg-Al水滑石的水热合成及合成机理[J]. 无机材料学报, 2008, 23(1): 93-98.
[9]	袁求理,聂秋林. 多臂 CdS纳米晶体的水热控制合成[J]. 无机材料学报, 2007, 22(1): 49-52.
[10]	孙杰,刘建华,李松梅. 尖晶石型Ni_0.8Zn_0.2Fe₂O₄纳米晶体的?制备及电磁性能研究[J]. 无机材料学报, 2005, 20(5): 1077-1082.
[11]	侯文生,魏丽乔,戴晋明,贾虎生,许并社. 载银4A沸石抗菌剂的制备及其抗菌性能的研究[J]. 无机材料学报, 2005, 20(4): 907-913.
[12]	吴其胜,高树军,张少明,杨南如. BaTiO₃纳米晶机械力化学合成[J]. 无机材料学报, 2002, 17(4): 719-724.
[13]	程宇航,吴一平,陈建国,乔学亮,谢长生,许德胜. a-C:H(N)薄膜的制备及性能[J]. 无机材料学报, 1999, 14(4): 601-606.
[14]	肖兴成,宋力昕,胡行方. 氮化碳薄膜制备及性能研究进展[J]. 无机材料学报, 1999, 14(3): 343-351.
[15]	王宏志,高濂,归林华,郭景坤. Al₂O₃-ZrO₂(3Y)-SiC纳米复合材料的制备及性能[J]. 无机材料学报, 1999, 14(2): 280-286.