Purdue University, Birck Nanotechnology Center, 1205 W State Street, West Lafayette, Indiana 47907, USA.
Nanoscale. 2009 Oct;1(1):133-7. doi: 10.1039/b9nr00033j. Epub 2009 Aug 13.
We demonstrate an optically induced electrokinetic technique that continuously concentrates nanoparticles on the surface of a parallel plate electrode that is biased with an AC signal. A highly focused beam of near-infrared light (1064 nm) was applied, inducing an electrothermal microfluidic vortex that carried nanoparticles to its center where they were accumulated. This technique was demonstrated with 49 nm and 100 nm fluorescent polystyrene particles and characterized as a function of applied AC frequency and voltage. With this technique the location and shape of colloidal concentration was reconfigured by controlling the optical landscape, yielding dynamic control of the aggregation. Colloidal concentration was demonstrated with a plain parallel plate electrode configuration without the need of photoconductive materials or complex microfabrication procedures.
我们展示了一种光诱导电动技术，该技术可将纳米粒子连续浓缩在带有交流信号偏置的平行板电极的表面上。应用了高度聚焦的近红外光（1064nm），诱导出电热微流涡将纳米粒子带到其中心，在那里它们被积累。该技术使用 49nm 和 100nm 荧光聚苯乙烯粒子进行了演示，并作为施加交流频率和电压的函数进行了表征。通过控制光学景观，该技术可以重新配置胶体浓度的位置和形状，从而实现聚合的动态控制。无需光导材料或复杂的微加工工艺，即可使用普通的平行板电极配置来实现胶体浓缩。
