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Phosphorylated silica nanotubes: Preparation and characterization

机译：磷酸化的二氧化硅纳米管：制备与表征

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摘要

Recently, the strategy of doping inorganic particles into polymer membranes to modify them has been studied intensively. However, these inorganic particles have a disadvantage without being in good compatibility with the polymers. To enhance the compatibility between inorganic particles and polymers, phosphorylated silica nanotubes (PSNTs) with specific high ratios of length to diameter are prepared. Silica nanotubes (SNTs) are prepared through the hydrolysis of tetraethyl orthosilicate in a mixture of aqueous ammonia and dl-tartaric acid, then PSNTs are obtained by silylation and phosphorylation modifications. The optimum synthesis conditions of PSNTs are explored; in addition, the as-prepared PSNTs are characterized by Fourier transform infrared, transmission electron microscope, BET, x-ray photoelectron spectroscopy analysis and thermogravimetric analysis. The results indicate that the ratio of length to diameter of the PSNTs is approximately 20, the thickness of the tube wall is 20 nm, the specific surface area of the PSNTs is 460.2 m~2 g~(-1), the inner diameter of the PSNTs is 76 nm, many mesopores are distributed in the tube walls of the PSNTs, and the PSNTs have numerous hydroxyl active sites along their length direction. Therefore, PSNTs are desirable as suitable fillers of polymer membranes.
机译：近来，已经深入研究了将无机颗粒掺杂到聚合物膜中以对其进行改性的策略。但是，这些无机颗粒与聚合物的相容性不好，存在缺点。为了增强无机颗粒和聚合物之间的相容性，制备了具有特定高的长径比的磷酸化二氧化硅纳米管（PSNT）。通过在氨水和dl-酒石酸的混合物中水解原硅酸四乙酯来制备二氧化硅纳米管（SNT），然后通过甲硅烷基化和磷酸化修饰获得PSNT。探索了PSNTs的最佳合成条件。此外，所制备的PSNT具有傅立叶变换红外光谱，透射电子显微镜，BET，X射线光电子能谱分析和热重分析的特征。结果表明，PSNT的长径比约为20，管壁厚度为20 nm，比表面积为460.2 m〜2 g〜（-1），内径PSNT为76nm，许多中孔分布在PSNT的管壁中，并且PSNT沿其长度方向具有许多羟基活性位点。因此，期望PSNT作为聚合物膜的合适填料。

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