Reduced shrinkage of sol–gel derived silicas using sugar-based silsesquioxane precursors
作者:Yang Chen、Zheng Zhang、Xihua Sui、John D. Brennan、Michael A. Brook
DOI:10.1039/b502959g
日期:——
Monolithic siliceous materials were prepared, using solâgel based methods, from mixtures of trifunctional silanes based on sugar lactones, including silyl-modified gluconamide GLS and maltonamide MLS, and a tetrafunctional silane derived from glycerol. The tri- and tetrafunctional compounds cured at different rates, which led to an enhanced presence of sugar moieties at the external surface of the pores in the monoliths. The resulting silicas exhibited dramatically reduced degrees of shrinkage (<10%) when compared to silica monoliths prepared in the absence of trifunctional silanes (up to 85%). The sugars also alter the morphology of the material, with significant reductions in both micropore volume and surface area for materials containing GLS. The reduced shrinkage, presence of sugars on the silica surface, and altered morphology are likely to be important factors in providing such materials with the ability to stabilize entrained proteins.
使用溶胶-凝胶法,从基于糖内酯的三官能硅烷混合物中制备出整体硅质材料,包括硅烷改性葡糖酰胺GLS和莫顿酰胺MLS,以及从甘油衍生的四官能硅烷。三官能和四官能化合物的固化速度不同,导致整体硅质材料孔隙外表面糖基团的存在增强。与不含三官能硅烷的硅质材料(收缩率高达85%)相比,所得硅质材料收缩率显著降低(<10%)。糖类还改变了材料的形态,含GLS材料的微孔体积和表面积显著减少。收缩率降低、硅质材料表面存在糖类以及形态改变可能是此类材料具有稳定夹带蛋白质能力的重要因素。