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首页> 外文期刊>Journal of Crystal Growth >Nucleation and growth of self-assembled nanofibre-structured rutile (TiO_2) particles via controlled forced hydrolysis of titanium tetrachloride solution
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Nucleation and growth of self-assembled nanofibre-structured rutile (TiO_2) particles via controlled forced hydrolysis of titanium tetrachloride solution

机译：通过四氯化钛溶液的受控强制水解，自组装纳米纤维结构的金红石（TiO_2）颗粒成核和生长

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摘要

In this study the production of rutile (TiO_2) nanostructured powders by forced hydrolysis of aqueous Ti(IV) chloride solutions was investigated in terms of precipitation kinetics and nucleation and growth mechanism over the temperature range 70-90 ℃ and Ti(IV) concentration 0.5-1.5 M. The precipitation kinetics was found to follow the Avrami model exhibiting a slow induction-nucleation stage and accelerating growth stage. The type and speed of agitation was found to have a pronounced effect on the nucleation kinetics that required the adoption of a mechanically agitated (1000 rpm) reactor for the obtainment of reproducible results. An increase in Ti(IV) chloride concentration was found to have a negative effect on kinetics pointing to differences in a precursor complex formation and polymerization behaviour. The obtained nanostructured rutile powder had a spheroidal particle morphology with the interior of the particles characterized by a nucleation core and self-assembled elongated fibres. The nucleation core consisted of primary aggregates of elementary nanocrystallites of ～ 10-20 nm size. The nanofibres were found to form via preferential growth of the (110) atomic planes. The nanostructured rutile powder exhibited high specific surface area in the order of 80 m~2/g.
机译：本文研究了在70-90℃和Ti（IV）浓度为0.5的条件下，通过沉淀动力学以及成核和生长机理，研究了氯化钛（IV）水溶液的强制水解制备金红石（TiO_2）纳米结构粉末。 -1.5M。发现沉淀动力学遵循Avrami模型，表现出缓慢的诱导成核阶段和加速的生长阶段。发现搅拌的类型和速度对成核动力学有显着影响，成核动力学需要采用机械搅拌（1000 rpm）的反应器以获得可再现的结果。发现氯化钛（IV）浓度的增加对动力学有负面影响，指出前体络合物形成和聚合行为的差异。所获得的纳米结构金红石粉具有球形颗粒形态，其颗粒内部具有成核芯和自组装的细长纤维的特征。成核核心由〜10-20 nm尺寸的基本纳米微晶的初生聚集体组成。发现纳米纤维是通过优先生长（110）原子面而形成的。纳米结构的金红石粉具有高的比表面积，约为80m 2 / g。

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