Pohang University of Science and Technology – Page 3

A Piezoelectric Micro-Cantilever Bio-Sensor Using the Mass-Micro-Balancing Technique with Self-Excitation

Lee Y., Lim G., Moon W., Pohang University of Science and Technology, KR

A new bio-sensor was developed in order to use in a LOC(Lab-On-a-Chip). The sensor detects the change in the resonance frequency of a micro cantilever with a piezoelectric film(PZT). This is the so-called mass micro-balancing [...]

Electrokinetic Instability Mechanism of Double-layered Miscible Fluids with Different Electrolyte Concentrations in DC Electric Field

Park J.W., Kang K.H., Huh K.Y., Pohang University of Science and Technology, KR

Interfacial instability has recently been observed for DC-powered electroosmotic flow by Chen and Santiago [1]. So far, no plausible explanation has yet been made since the phenomenon is contrary to common belief of laminar flow [...]

Numerical Visualization and Quantification of Chaotic Mixing for Micromixers

Kang T.G., Kwon T.H., Pohang University of Science and Technology, KR

We present a systematic way of visualization and quantification of mixing in chaotic micromixers with a periodic mixing protocol. We name it colored particle tracking method, which consists of three steps. One is flow analysis [...]

Theoretical Investigations of Intermolecular Interactions Involving Pi-Systems and Their Utility in the Design of Novel Functional Nanomaterials

Tarakeshwar P., Kim K.S., Pohang University of Science and Technology, KR

The design and development of novel functional nano-systems has received great attention because of their potential applications in electronics, physics, chemistry, biology, and medicine. An effective design strategy requires a thorough understanding of various interaction [...]

Prediction Model of Microlens Fabricated by Modified LIGA Process

Kim D.S., Lee S-K, Lee S.S., Yang S.S., Kwon T.H., Lee S-K, Lee S.S., Pohang University of Science and Technology, KR

In this paper, we present a prediction model for microlens formation by means of a deep X-ray lithography followed by a thermal treatment of a PMMA (Polymethyl-methacrylate) sheet. According to this modeling, X-ray irradiation causes [...]

Transient Filling Flow into Microchannels Considering Surface Tension

Kim D.S., Lee K-C, Lee S.S., Kwon T.H., Lee K-C, Lee S.S., Pohang University of Science and Technology, KR

In this paper, we investigated, both experimentally and numerically, transient “filling” flow into microchannels, which differs from completely “filled” flow in micro-channels. An experimental flow visualization system was devised to observe the characteristics of microchannel [...]