Trau M, Saville DA, Aksay IA
Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton, NJ 08544, USA.
Science. 1996 May 3;272(5262):706-9. doi: 10.1126/science.272.5262.706.
An electrohydrodynamic methodology has been developed that makes possible the precise assembly of two- and three-dimensional colloidal crystals on electrode surfaces. Electrophoretically deposited colloidal particles were observed to move toward one another over very large distances (greater than five particle diameters) to form two-dimensional colloidal crystals for both micrometer- and nanometer-size particles. This coalescence of particles with the same charge is opposite to what is expected from electrostatic considerations and appears to result from electrohydrodynamic fluid flow arising from an ionic current flowing through the solution. The ability to modulate this "lateral attraction" between particles, by adjusting field strength or frequency, facilitates the reversible formation of two-dimensional fluid and crystalline colloidal states on the electrode surface. Further manipulation allows controlled structures to be assembled.
已经开发出一种电流体动力学方法，该方法能够在电极表面精确组装二维和三维胶体晶体。观察到电泳沉积的胶体颗粒在非常大的距离（大于五个颗粒直径）上相互靠近，从而形成微米级和纳米级颗粒的二维胶体晶体。这种相同电荷颗粒的聚结与静电学考虑所预期的情况相反，似乎是由流过溶液的离子电流产生的电流体动力学流体流动导致的。通过调节场强或频率来调节颗粒之间这种“横向吸引力”的能力，有助于在电极表面可逆地形成二维流体和晶体胶体状态。进一步的操作可以组装出可控结构。
