| 초록 |
We will discuss how electrically induced forces could be used to manipulate particles and fluids in microfluidic devices. First, we will focus on a technique for on-chip manipulation of freely floating droplets. Evaporation from water droplets leads to internal circulation and particle microseparation driven by Marangoni instabilities. The droplets could serve as templates for colloidal assembly and microbioassays. Second, we will demonstrate how an additional level of complexity can be engineered to turn various types of miniature diodes into self-propelling micromachines and micropump/micromixer. The diodes in water propel themselves electroosmotically under the AC field application. These active particles suggest rudimentary solutions to problems facing self-propelling microdevices, including harvesting power from external sources, internally controlled movement, and potential for additional functions. |
