Other Publications (1)
Articles by Jonghyun Oh in JoVE
AC Electrokinetic Phenomena Generated by Microelectrode Structures Robert Hart1, Jonghyun Oh2, Jorge Capurro2, Hongseok (Moses) Noh2 1Biomedical Engineering, Science and Health Systems, Drexel University, 2Mechanical Engineering and Mechanics, Drexel University Manipulating fluids and suspended particles in the micro- and nano-scale is becoming more of a reality as enabling technologies, like AC electrokinetics, continue to develop. Here, we discuss the physics behind AC electrokinetics, how to fabricate these devices and how to interpret the experimental observations.
Other articles by Jonghyun Oh on PubMed
Comprehensive Analysis of Particle Motion Under Non-uniform AC Electric Fields in a Microchannel Lab on a Chip. Jan, 2009 | Pubmed ID: 19209337 AC electrokinetics is rapidly becoming a foundational tool for lab-on-a-chip systems due to its versatility and the simplicity of the components capable of generating them. Predicting the behavior of fluids and particles under non-uniform AC electric fields is important for the design of next generation devices. Though there are several important phenomena that contribute to the overall behavior of particles and fluids, current predictive techniques consider special conditions where only a single phenomenon may be considered. We report a 2D numerical simulation, using COMSOL Multiphysics, which incorporates the three major AC electrokinetic phenomena (dielectrophoresis, AC electroosmosis and electrothermal effect) and is valid for a wide range of operational conditions. Corroboration has been performed using experimental conditions that mimic those of the simulation and shows good qualitative agreement. Furthermore, a broad range of experiments has been performed using four of the most widely reported devices under varying conditions in order to show their behavior as it relates to the simulation. The large number of experimental conditions reported, together with the comprehensive numerical simulation, will help provide guidelines for scientists and engineers interested in incorporating AC electrokinetics into their lab-on-a-chip systems.