School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, USA.
ChemSusChem. 2011 Jul 18;4(7):964-74. doi: 10.1002/cssc.201000322. Epub 2010 Dec 23.
Nanohybrids composed of "onion-like" carbon, single-walled (SWCNTs) or multi-walled carbon nanotubes (MWCNTs) fused to silica or alumina particles have been compared as stabilizers of water/oil emulsions and interfacial catalysts. The amphiphilic character of these nanohybrids makes them effective in stabilizing emulsions (up to 85 % of total volume) comprising of small droplets (less than 40 μm). Furthermore, these nanohybrids have been used as supports for transition metal particles (palladium and copper) to catalyze reactions at the water/oil interface. Three different reaction systems have been conducted in the emulsions to demonstrate the principle: 1) hydrogenation of phenanthrene; 2) hydrogenation of glutaraldehyde and benzaldehyde; 3) oxidation of tetralin. Comparison of the maximum conversions achieved in emulsions as opposed to the single phase, together with much better control of selectivity in the two-phase system shows the benefits of using these nanohybrid catalysts.
由“洋葱状”碳、单壁（SWCNTs）或多壁碳纳米管（MWCNTs）与二氧化硅或氧化铝颗粒融合而成的纳米杂化物已被用作水/油乳液的稳定剂和界面催化剂进行了比较。这些纳米杂化物的两亲特性使其能够有效地稳定乳液（高达总容积的 85%），其中包含小液滴（小于 40 μm）。此外，这些纳米杂化物已被用作过渡金属颗粒（钯和铜）的载体，以在水/油界面催化反应。在乳液中进行了三种不同的反应系统来验证这一原理：1）菲的加氢；2）戊二醛和苯甲醛的加氢；3）四氢萘的氧化。与单相相比，在乳液中实现的最大转化率的比较，以及两相体系中选择性的更好控制表明了使用这些纳米杂化催化剂的优势。
