利用嵌段共聚物及无机盐合成高质量的立方相、大孔径介孔氧化硅球

Block Copolymer Synthesis of High-quality Cubic, Large Pore Mesoporous Millimeter Spheres in the Presence of Inorganic Salts

使用非离子型嵌段高分子表面活性剂为模板剂 ,在无机盐的作用下 ,合成了直径在 2～ 4mm、高度有序、立方相的介孔氧化硅SBA 16球 .利用无机盐来调变无机 有机物种之间的作用力和自组装能力 ,不仅在介观尺寸上提高了所合成介孔材料的有序程度 ,而且在宏观上控制了介孔材料的形貌 .经焙烧后的SBA 16球材料比表面积为 75 0m2 g ,孔容为 0 5 2cm3 g ,孔径为 7 8nm .具有大孔径的SBA 16球材料可以更方便地应用于大分子吸附和分离等领域 .

Highly ordered cubic mesoporous silica SBA-16 with millimeter spherical morphology (2 similar to 4 mm in diameter) has been synthesized using triblock copolymer as templates in the presence of inorganic salts. The use of inorganic salts greatly improves the quality of the resulted mesostructure by increasing the self-assemble ability of organic species and results in the formation. of millimeter spheres by enhancing the interaction at the inorganic/organic interface. The calcined millimeter SBA-16 spheres have a surface area of 750 m(2)/g, a pore volume of 0.52 cm(3)/g, and a large pore size of 7.8 nm. These millimeter spheres may be readily used in the separation of large molecules.