Zhao D, Feng J, Huo Q, Melosh N, Fredrickson GH, Chmelka BF, Stucky GD
D. Zhao, Q. Huo, G. D. Stucky, Department of Chemistry and Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA. J. Feng, Department of Chemistry and Center for Quantized Electronic Structures, University of.
Science. 1998 Jan 23;279(5350):548-52. doi: 10.1126/science.279.5350.548.
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.
使用两亲性三嵌段共聚物来引导聚合二氧化硅物种的组装，已成功制备出孔径均匀、可达约300埃的有序六方介孔二氧化硅结构（SBA - 15）。SBA - 15材料在酸性介质中合成，以产生高度有序的二维六方（空间群p6mm）二氧化硅 - 嵌段共聚物介相。在500℃下煅烧得到的多孔结构，其（100）平面之间的晶格d间距异常大，在74.5至320埃之间，孔径为46至300埃，孔体积分数高达0.85，二氧化硅壁厚为31至64埃。使用各种聚环氧烷三嵌段共聚物并通过添加共溶剂有机分子，SBA - 15可以在低温（35℃至80℃）下轻松制备出各种均匀的孔径和孔壁厚度。通过用乙醇进行溶剂萃取，可以回收嵌段共聚物物种以供再利用，或者通过在140℃下加热3小时将其除去，在这两种情况下，得到的产物在沸水中都具有热稳定性。
