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The synthesis of aqueous-dispersible anatase TiO2 nanoplatelets

机译：水分散型锐钛矿型TiO2纳米片的合成

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摘要

Aqueous well-dispersed and phase-pure anatase TiO2 truncated octahedron nanoplatelets (NPLs) were prepared via controlled hydrolysis of titanium tetrachloride (TiCl4) in ethylene glycol at 240 degrees C. Two shapes, square and hexagon, were observed by microscopy, exactly corresponding to the truncated octahedron NPLs. Ethylene glycol was found to produce water in situ that reacts with TiCl4 to produce TiO2 and HCl-the latter promoting TiO2 colloid peptization. TiO2 truncated octahedron NPLs are formed under the stabilizing action of ethylene glycol thermolysis derivatives, such as aldehydes. Crystal growth of the TiO2 NPLs was affected by the reaction temperature that determines the water production rate and HCl-assisted peptization. TGA and FT-IR results showed similar to 1.2% ethylene glycol thermolysis derivatives are attached to the surface of the TiO2 NPLs, which prevents their agglomeration, hence making them easily dispersible in aqueous media. HR-TEM and SAED results showed that the TiO2 NPLs are well crystallized and that the SAED patterns of the single TiO2 NPL changes with its size and shape. XRD patterns showed that the TiO2 NPLs are phase-pure anatase and the percentage of the {101} plane in the TiO2 NPLs to be only 18%-a structural feature that renders the TiO2 NPLs with enhanced UV absorption and reactivity properties.
机译：通过在240℃在乙二醇中四氯化钛（TiCl4）的可控水解，制备了水分散性良好且相纯的锐钛矿型TiO2截短的八面体纳米片（NPL）。用显微镜观察到正方形和六边形两种形状，完全对应于截短的八面体不良贷款。发现乙二醇原位产生水，该水与TiCl4反应生成TiO2和HCl，后者促进TiO2胶体胶溶。 TiO2截短的八面体NPL是在乙二醇热解衍生物（例如醛）的稳定作用下形成的。 TiO2 NPL的晶体生长受反应温度的影响，该温度决定了产水速率和HCl辅助的胶溶作用。 TGA和FT-IR结果表明，类似于1.2％的乙二醇热分解衍生物附着在TiO2 NPL的表面，这防止了它们的团聚，因此使其易于分散在水性介质中。 HR-TEM和SAED结果表明TiO2 NPL结晶良好，单个TiO2 NPL的SAED图案随其尺寸和形状而变化。 XRD图谱表明，TiO2 NPL是纯的锐钛矿，并且在TiO2 NPL中{101}晶面的百分比仅为18％-结构特征，使TiO2 NPL具有增强的UV吸收和反应性。

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