Morphology of anatase crystals and their aggregates synthesized hydrothermally from aqueous mixtures of titanium alkoxide and different alkylammonium hydroxides
Morphology of anatase crystals and their aggregates synthesized hydrothermally from aqueous mixtures of titanium alkoxide and different alkylammonium hydroxides
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DOI：
10.2109/jcersj2.117.268
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发表时间：
2009-03-01
影响因子：
1.1
通讯作者：
Ohya, Yutaka
中科院分区：
文献类型：
--
作者：
Ban, Takayuki;Nakatani, Tomohiko;Ohya, Yutaka
锐钛矿是由包括层状钛酸盐胶体的透明水溶胶水热合成的。反应溶胶由异丙醇钛和不同的氢氧化烷基铵（NR4OH）制备。研究了 NR4OH 类型对锐钛矿晶体及其聚集体形态的影响。我们之前报道过，虽然锐钛矿具有四方晶格，但使用 N(CH3)(4)OH 制备的溶胶合成了六角星形锐钛矿聚集体。随着NR4OH烷基链长度的增加，星状聚集体的数量减少，并且它们的臂变得更粗更短。当使用N(C4H9)(4)OH时，形成沿c轴拉长的针状锐钛矿晶体，而不是星状聚集体。使用具有长烷基链的 NR4OH 预计可以延迟水热合成过程中层状钛酸酯的堆积。层状钛酸盐胶体的堆积和剥落可能对所得锐钛矿晶体及其聚集体的形态起着重要作用。 (C) 2009 日本陶瓷学会。版权所有。
Anatase was hydrothermally synthesized from transparent aqueous sols including layered titanate colloids. The reaction sols were prepared from titanium isopropoxide and different alkylammonium hydroxides (NR4OH). The influence of the type of NR4OH on the morphology of the anatase crystals and their aggregates was examined. We previously reported that although anatase has a tetragonal lattice, six-pointed starlike anatase aggregates were synthesized from the sols prepared using N(CH3)(4)OH. With increasing the alkyl chain length of NR4OH, the number of the starlike aggregates decreased, and their arms became thicker and shorter. When N(C4H9)(4)OH was used, needlelike anatase crystals elongated along the c-axis were formed rather than starlike aggregates. The use of NR4OH with long alkyl chains were expected to retard stacking of the layered titanate during hydrothermal synthesis. The stacking and exfoliation of the layered titanate colloids may play an important role in the morphology of the resulting anatase crystals and their aggregates. (C) 2009 The Ceramic Society of Japan. All rights reserved.