Synthesis of brookite TiO2 nanoparticles by thermolysis of TiCl4 in strongly acidic aqueous media
Synthesis of brookite TiO2 nanoparticles by thermolysis of TiCl4 in strongly acidic aqueous media
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DOI：
10.1039/b100435m
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发表时间：
2001-01-01
影响因子：
--
通讯作者：
Jolivet, JP
中科院分区：
文献类型：
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作者：
Pottier, A;Chanéac, C;Jolivet, JP
在浓HCl溶液中，通过热分解TiCl4，合成了二氧化钛、板钛矿和金红石多晶型物的纳米颗粒。Cl：Ti摩尔比似乎是决定晶相和它们的相对比例以及颗粒尺寸的关键因素，并且在特定条件下可以获得大比例的板钛矿。Ti（OH）（2）（Cl）（2）（OH2）（2）可能是板钛矿相的前驱体。氯离子的存在对于稳定悬浮液中的板钛矿也是必要的。取决于酸度和老化条件，获得不同形态的板钛矿纳米颗粒，即球状颗粒或片晶。纯板钛矿的稳定溶胶通过固相的胶溶获得。
Nanometric particles of titania, brookite and rutile polymorphs were synthesised by thermolysis of TiCl4 in concentrated HCl solutions. The Cl:Ti molar ratio seems to be the key factor in determining the crystalline phases and their relative proportions as well as the particle size and a large proportion of brookite can be obtained under specific conditions. The complex Ti(OH)(2)(Cl)(2)(OH2)(2) seems to be the precursor of the brookite phase. The presence of chloride ions is also necessary to stabilise brookite in suspension. Depending on the acidity and the ageing conditions, different morphologies of brookite nanoparticles are obtained, namely spheroidal particles or platelets. Stable sols of pure brookite are obtained by peptization of the solid phase.