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首页> 外文期刊>Chemistry: A European journal >Homogeneous and disordered assembly of densely packed titanium oxide nanocrystals: An approach to coupled synthesis and assembly in aqueous solution
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Homogeneous and disordered assembly of densely packed titanium oxide nanocrystals: An approach to coupled synthesis and assembly in aqueous solution

机译：密集堆积的氧化钛纳米晶体的均质和无序组装：在水溶液中耦合合成和组装的方法

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摘要

A homogeneous and disordered assembly of densely packed nanocrystals 2-3 nm in size was synthesized at room temperature in an aqueous solution without the assistance of any organic molecules. The assembled nanocrystals of titanium oxides, such as anatase titanium dioxide, sodium titanate, and a solid solution with rutile tin dioxide, formed macroscopic transparent objects 2-5 mm in size. In general, it is not easy to obtain homogeneous and disordered assembly of nanocrystals without assistance of any organic molecules for the inhibition of inhomogeneous and disordered aggregation. In the present work, the formation of the hydrated layer on the surface of nanocrystals facilitated the homogeneous and disordered assembly. The crystal phases and the compositions of the nanocrystals were controlled by the tuning of the synthetic conditions, such as the initial pH and metal source concentration. Based on the formation processes and mechanisms, this approach for the coupled synthesis and assembly can be applied to a variety of nanomaterials for preparation of homogeneous but disordered assembly. A homogeneous and disordered assembly of densely packed titanium oxides nanocrystals 2-3 nm in size is formed by means of aqueous-solution processes at room temperature. The assembled nanocrystals form macroscopic transparent objects 2-5 mm in size. Formation of the hydrated layer on the surface of nanocrystals facilitates the generation of macroscopic objects through the inhibition of inhomogeneous and disordered aggregates.
机译：在室温下，在水溶液中无需任何有机分子的帮助下，合成了大小均匀的无序组装的2-3 nm的密集堆积纳米晶体。氧化钛（如锐钛矿型二氧化钛，钛酸钠和金红石型二氧化锡的固溶体）的组装纳米晶体形成了尺寸为2-5 mm的宏观透明物体。通常，不借助任何有机分子来抑制不均匀和无序聚集的方法，就很难获得均匀且无序的纳米晶体组装体。在目前的工作中，在纳米晶体表面上形成水合层有助于均匀和无序的组装。通过调节合成条件，例如初始pH和金属源浓度，来控制纳米晶体的晶相和组成。基于形成过程和机理，用于偶联合成和组装的这种方法可以应用于多种纳米材料以制备均匀但无序的组装。通过在室温下的水溶液法形成大小为2-3nm的紧密堆积的氧化钛纳米晶体的均匀且无序的组装。组装的纳米晶体形成尺寸为2-5mm的宏观透明物体。通过抑制不均匀和无序的聚集体，在纳米晶体表面上形成水合层有助于宏观物体的产生。

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