Kim D.S. – TechConnect Briefs

Laser precipitation of Eu and Yb codoped CaF2 nanocrystals on the surface of glass and emission characteristics

Bae C-H, Kim D.S., Lim K-S, Chungbuk National University, KR

We precipitated spatially selective Eu/Yb doped CaF2 nanocrystals on the surface of glass by CO2 laser irradiation. Because of low phonon energy of CaF2, we observed several times enhancements in down-shift emission under 365 nm [...]

Magnetohydrodynamic (MHD) Complex Flow Generation in Microchannel

Kim D.S., Kwon T.H., Pohang University of Science and Technology (POSTECH), KR

In this paper, we present design methodologies for magnetohydrodynamic (MHD) complex flow generation in a simple straight microchannel in which electrodes are patterned on two side walls and bottom wall. The required applied voltage conditions [...]

Modeling, Analysis and Design of Centrifugal Force Driven Transient Filling Flow into Rectangular Microchannel

Kim D.S., Kwon T.H., Pohang University of Science and Technology, KR

In this paper, we first present successful modeling and analysis results of a centrifugal force driven transient filling flow into a rectangular microchannel. Two types of exact and pseudo-static approximate solutions were derived for the [...]

Synthesis and Application of Nanofabricated Nanoporous Materials

Chang J-S, Hwang J.S., Hwang Y.K., Jhung S.H., Kim D.S., Park S-E, Korea Research Institute of Chemical Technology, KR

Zeolitic (molecular sieves) or mesoporous materials are the promising candidates for nanoscopically-engineered materials due to their well-defined pore structures, thermal stabilities and tailor-made synthetic abilities. Several zeolitic materials with the shape of nanorod or nanofiber [...]

A Vertical MOSFET for Charge Sensing in the Convex Corner of Si Microchannels

Choi P., Kim D.S., Lee M., Lim G., Lyu H-K, Park C-S, Shin J-K, Kyungpook National University, KP

In this paper, we will present a vertical MOSFET formed in the convex corner of silicon microchannels which might be useful for detecting charged biomolecules. The cross type microchannels have four MOSFETs and four pairs [...]

Prediction Model of Microlens Fabricated by Modified LIGA Process

Kim D.S., Kwon T.H., Lee S-K, Lee S.S., Yang 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., 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 [...]