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Preparation of mesoporous silica membrane by solvent evaporation method for filtration application

机译：溶剂蒸发法制备介孔二氧化硅膜的应用

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Mesoporous silica membranes were prepared by solvent evaporation methods using tetraethyl orthosilicate(TEOS)as a silica source and hexadecyltrimethylammonium chloride(CTAC)as a template and applied to filtration membranes which enable to separate solutes by nano-order size.Effect of the membrane thickness on structure formation was studied.The final membrane thicknesses were controlled from 0.43mum to 127.7 jjom by several deposition methods,such as spin-coating,casting by applicator,and pouring in Petri dish.The mesophase of the membrane changed from a cubic phase to a one-dimensional hexagonal(1 d-H)phase with increasing membrane thickness.The membrane thickness was one of the key factors to control the mesostructure formed in the solvent evaporation method.In the monitoring of the structural growth process,it was found that 1d-hexagonal structure was initially obtained on a glass substrate,and this structure was changed to cubic structure.This result can be explained by changing the surfactant concentration,which decides the mesostructures.For filtration application,the silica membrane with the cubic structure was deposited by spin-coating on the porous alumina substrate.The rejection coefficient of Vitamin B_(12)with the molecular weight of 1355 was about 0.8.
机译：以原硅酸四乙酯（TEOS）为二氧化硅源，以十六烷基三甲基氯化铵（CTAC）为模板，通过溶剂蒸发法制备了介孔二氧化硅膜，并应用于过滤膜，该分离膜能够按纳米级尺寸分离溶质。研究了膜结构的形成。通过旋涂，涂胶浇铸，倒入陪替氏培养皿等几种沉积方法将膜的最终厚度控制在0.43μm至127.7jjom之间。一维六方相（1 dH）随着膜的厚度增加。膜厚是控制溶剂蒸发法形成的介观结构的关键因素之一。在结构生长过程的监测中，发现一维六方相最初是在玻璃基板上获得结构，然后将该结构更改为立方结构。表面活性剂的浓度决定了介孔结构。在过滤应用中，将立方结构的二氧化硅膜旋涂在多孔氧化铝基体上。分子量为1355的维生素B_（12）的截留系数约为0.8 。

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