KR – Page 54 – TechConnect Briefs

Numerical Analysis of Nano-imprinting Process Based on Continuum Hypothesis

Kim B.S., Kim H-C, Woo Y.S., Lee W.I., Oh S.I., Kim B.S., Kim H-C, School of Mechanical and Aerospace Engineering, Seoul National University., KR

Nano-imprint lithography (NIL) is a processing tech-nique capable of transferring nano-scale patterns onto a thin film of thermoplastics such as polymethyl methacrylate (PMMA). Feature sizes down to 10 nm have been demonstrated to be made [...]

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 [...]

Capillary Passive Valve in Microfluidic System

Cho H., Kim H-Y, Kim T.S., Kang J.Y., Kim H-Y, Kim T.S., Microsystem Research Center, Korea Institute of Science and Technology, KR

This work reports the theoretical and experimental investigations of capillary bust valves to regulate liquid flow in microchannels. The theoretical analysis uses the Young-Laplace equation and geometrical considerations to predict the pressure at the edge [...]

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 [...]

A Microfluidic System with Nonenzymatic Glucose Sensor

Joo S., Park S., Lim H., Chung T.D., Kim H-C, Seoul National University, KR

In this paper, we report an amperometric-type enzymeless glucose sensor system based on nanoporous platinum (Pt) and platinum/platinum oxide (Pt/PtO) reference electrode, which are integrated with microfluidic chip. Glucose sensor employing no enzyme implies a [...]

Highly Efficient Electro-permeabilization of Mammalian Cells Using Micro-electroporation Chip

Shin Y.S., Kim J.K., Lim S.H., Lee Y., Lee Y.K., Cho K., Lee Y., Lee Y.K., Chung C., Chung S., Chung C., Chung S., Han D-C, Chang J.K., Seoul National University, KR

Electroporation, is widely used method that can be directly applied to the field of gene therapy. However, very little is known about the basic mechanisms of DNA transfer and cell response to the electric pulse. [...]

Microfabricated Fluorescence-Activated Cell Sorter with Hydrodynamic Flow Manipulation

Bang H., Chung C., Chung S., Kim J.K., Kim S., Kim J.K., Kim S., Chung C., Chung S., Han D-C, Chang J.K., School of Mechanical & Aerospace Eng., Seoul National University, KR

Presented is a novel flow manipulation and particle detection method for the microfabricated fluorescence-activated cell sorter (FACS). With hydrodynamic flow manipulation which includes passive flow channeling and hydrodynamic actuation with nozzle flow, we have developed [...]

Ab Initio Calculations on Magnetic Properties of Diluted Magnetic Semiconductors

Kim H., Kim Y-S, Kim H., Kim Y-S, Chung Y-C, Hanyang University, KR

Some diluted magnetic semiconductors (DMS), in which magnetic elements are substituted for a small fraction (~5%) of host elements in a semiconductor lattice, show ferromagnetism, and thus possess potential applicability in spintronics. To obtain quantum-mechanical [...]

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 [...]

System Identification for Motion of Proteins Using an AFM-based Nanorobotic Manipulation

Park J., Kim B-K., Kim D-H., Kim B-K., Kim D-H., Lee K-I., Korea Institute of Science and Technology, KR

It is greatly important to understand the mechanics of AFM-based nanorobotic manipulation for efficient and reliable handling of nanoparticles. Robust motion control of an AFM-based nanorobotic manipulation is much challenging due to uncertain mechanics in [...]