Catalytic Micropumps: Microscopic Convective Fluid Flow and Pattern Formation

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• 作者：Timothy R. Kline ; Walter F. Paxton ; Yang Wang ; Darrell Velegol ; Thomas E. Mallouk ; and Ayusman Sen
• 刊名：Journal of the American Chemical Society
• 出版年：2005
• 出版时间：December 14, 2005
• 年：2005
• 卷：127
• 期：49
• 页码：17150 - 17151
• 全文大小：96K
• 年卷期：v.127,no.49(December 14, 2005)
• ISSN：1520-5126

文摘

As innovations continue to be made in the fields of microfluidics and the colloidal assembly, new strategies for moving particles and fluids may be needed. Heterogeneous catalysis provides means of locally converting the stored chemical energy of fuels to mechanical energy. We report an ambient temperature stationary "pump" that generates a proton concentration gradient through the bipolar electrochemical decomposition of hydrogen peroxide on patterned silver-gold surfaces. The resulting electric field drives convective fluid flow and pattern formation of colloidal tracer particles at the microscopic level by a combination of electroosmotic and electrophoretic forces.