Hierarchically Ordered Nanoporous-Macroporous Materials

分级有序的纳米孔-大孔材料

• 批准号: 9871970
• 负责人: David Pine
• 金额: $ 56.51万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2002-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9871970&HistoricalAwards=false
• 关键词: Hierarchically; Ordered; Nanoporous; Macroporous; Materials

ABSTRACT - Pine - 9871970 Professors D.J. Pine and B.F. Chmelka will develop new monolithic porous materials containing a combination of pores of mean diameter ranges 2-50 nm and 0.1-10 micron. The dual pore construction will be achieved with a method that combines two processes: monodisperse emulsion templating of polymerizable inorganic precursors to fabricate the macropores, and amphiphilic surfactant-guided self-assembly of the precursors to produce the mesopores. Subsequent gelation, drying, and heat treatment will lead to the monoliths. The synthetic methods for the hierarchically ordered pore structures will allow control of the size and geometry for each range independently, and for a wide spectrum of inorganic oxide compositions (silica, alumina, titania, zirconia, oxides of antimony, tungsten, iron, zinc, magnesium, manganese, nickel, cobalt, lead, and gallium). The templating technique will also permit functional modification of the framework surfaces. Novel catalytic substrates, sensors, passive or active filters, or optical materials, may result. Physicochemical characterization of the synthesized materials will involve NMR, x-ray scattering, gas adsorption and optical measurements. Chemical reaction characterization will consist of the hydrogenation of styrene-butadiene over dispersed Pt in the mesopores, and the polymerization of propylene over Zr-metallocene-functionalized mesopores. The separation properties of the materials will be affected by incorporating unsaturated hydrocarbon or cationic sites (to increase affinity to aromatic or halogen groups, respectively), or by incorporating mercaptoalkylsilanes (to strongly adsorb heavy metals). The optical and sensor properties will be tuned by functionalization with II-VI semiconductor species within the large pore structure (to create infrared photonic optical materials). The grant will also support an international exchange between UCSB and Bordeaux, with the laboratory of Prof. Jerome Bibette, which has expertise in formulat ion production, and processing of monidisperse emulsions. The primary mechanism of cooperation will be through graduate student extended reciprocal visits.

摘要- Pine - 9871970教授D. J. Pine和B.F. Chmelka将开发新的整体多孔材料，其中包含平均直径范围为2-50 nm和0.1-10微米的孔的组合。双孔结构将通过结合两个过程的方法来实现：可聚合无机前体的单分散乳液模板化以制造大孔，以及前体的两亲性表面活性剂引导的自组装以产生中孔。随后的凝胶化、干燥和热处理将产生整料。用于分级有序孔结构的合成方法将允许独立地控制每个范围的尺寸和几何形状，并且用于宽范围的无机氧化物组合物（二氧化硅、氧化铝、二氧化钛、氧化锆、锑、钨、铁、锌、镁、锰、镍、钴、铅和镓的氧化物）。模板技术还将允许框架表面的功能性修改。新的催化底物，传感器，无源或有源滤波器，或光学材料，可能会导致。合成材料的物理化学表征将涉及NMR，X射线散射，气体吸附和光学测量。化学反应表征将包括苯乙烯-丁二烯在分散在介孔中的Pt上的氢化，以及丙烯在Zr-茂金属官能化介孔上的聚合。材料的分离性能将通过引入不饱和烃或阳离子位点（以分别增加对芳族或卤素基团的亲和力）或通过引入巯基烷基硅烷（以强烈吸附重金属）而受到影响。光学和传感器特性将通过在大孔结构内用II-VI族半导体物质官能化来调节（以产生红外光子光学材料）。 这笔赠款还将支持UCSB和波尔多之间的国际交流，杰罗姆比贝特教授的实验室在配方生产和单分散乳液加工方面具有专业知识。合作的主要机制将是通过研究生扩大互访。