Microparticles with Bimodal Nanoporosity Derived by Microemulsion Templating
Microparticles with Bimodal Nanoporosity Derived by Microemulsion Templating
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DOI：
10.1021/la900988j
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发表时间：
2009-12-01
期刊：
影响因子：
3.9
通讯作者：
Petsev, Dimiter N.
中科院分区：
文献类型：
--
作者：
Carroll, Nick J.;Pylypenko, Svitlana;Petsev, Dimiter N.
油、水和表面活性剂液体混合物表现出非常复杂的相行为。根据条件，这种混合物产生高度有序的结构。适当选择表面活性剂的类型和浓度决定了纳米级的结构化。在这篇文章中，我们表明，可以通过模板二氧化硅微粒与一个专门设计的表面活性剂胶束/微乳液的混合物，得到分级双峰多孔结构。通过调节表面活性剂的组成和浓度来调节相态，允许对其中微乳液液滴与较小的表面活性剂胶束结构共存的系统进行受控设计。微乳液液滴和胶束尺寸决定了两种类型的孔径。我们还展示了碳和碳/铂的二氧化硅微球的复制品使用“失蜡”的方法制造。这种颗粒在燃料电池、色谱分离和其他应用的电催化剂的设计方面具有巨大的潜力。
Oil, water, and surfactant liquid mixtures exhibit very complex phase behavior. Depending on the conditions, such mixtures give rise to highly organized structures. A proper selection of the type and concentration of surfactants determines the structuring at the nanoscale level. In this Article, we show that hierarchically bimodal porous structures can be obtained by templating silica microparticles with a specially designed surfactant micelle/microemulsion mixture. Tuning the phase state by adjusting the surfactant composition and concentration allows for the controlled design of a system where microemulsion droplets coexist with smaller surfactant micellar structures. The microemulsion droplet and micellar dimensions determine the two types of pore sizes. We also demonstrate the fabrication of carbon and carbon/platinum replicas of the silica microspheres using a "lost-wax" approach. Such particles have great potential for the design of electrocatalysts for fuel cells, chromatography separations, and other applications.