Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores
Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores
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DOI：
10.1126/science.279.5350.548
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发表时间：
1998-01-23
期刊：
影响因子：
56.9
通讯作者：
Stucky, GD
中科院分区：
文献类型：
--
作者：
Zhao, DY;Feng, JL;Stucky, GD
使用两亲性三嵌段共聚物来指导聚合二氧化硅物质的组织已经导致制备具有高达约300埃的均匀孔径的良好有序的六方介孔二氧化硅结构（SBA-15）。（空间群p6 mm）二氧化硅-嵌段共聚物中间相，在500 ℃下煅烧得到多孔结构，在（100）平面之间具有74.5至320埃的异常大的晶格间距d，孔径为46至300埃，孔体积分数高达0.85，二氧化硅壁厚为31 - 64埃。SBA-15可以在低温下容易地在宽范围内制备均匀的孔径和孔壁厚度（35度至80摄氏度），使用各种聚嵌段共聚物物质可以通过用乙醇进行溶剂萃取来回收以重新使用，或者通过在140 ℃下加热3小时来除去，在这两种情况下，产生在沸水中热稳定的产物。
Use of amphiphilic triblock copolymers to direct the organization of polymerizing silica species has resulted in the preparation of well-ordered hexagonal mesoporous silica structures (SBA-15) with uniform pore sizes up to approximately 300 angstroms, The SBA-15 materials are synthesized in acidic media to produce highly ordered, two-dimensional hexagonal (space group p6mm) silica-block copolymer mesophases, Calcination at 500 degrees C gives porous structures with unusually large interlattice d spacings of 74.5 to 320 angstroms between the (100) planes, pore sizes from 46 to 300 angstroms, pore volume fractions up to 0.85, and silica wall thicknesses of 31 to 64 angstroms. SBA-15 can be readily prepared over a wide range of uniform pore sizes and pore wall thicknesses at low temperature (35 degrees to 80 degrees C), using a variety of poly(alkylene oxide) triblock copolymers and by the addition of cosolvent organic molecules, The block copolymer species can be recovered for reuse by solvent extraction with ethanol or removed by heating at 140 degrees C for 3 hours, in both cases, yielding a product that is thermally stable in boiling water.