KR – Page 12 – TechConnect Briefs

Direct Observation of Nanofabrication using the Optical Microscope combined with Nanopipette/QTF-AFM System

An S., Stambaugh C., Kwon S., Lee K., Kim B., Kim Q., Kim B., Kim Q., Jhe W., Seoul National University, KR

We demonstrated direct observation of nanofabrication using the optical microscope (OM) combined with nanopipette/QTF-AFM (Quartz Tuning Fork-Atomic Force Microscopy) system. Various solutions are ejected onto the substrate through the nano-/micro-aperture of the pulled pipette, and [...]

Possible explanations of the deviations in the thermal conductivity measurements

Han K., Lee M., Koo J., Kedzierski M.A., Kyung Hee University, KR

Nanofluids were invented to enhance thermal conductivity of the working fluid near the wall region, where the conduction is the only mechanism to dissipate heat and it limits the heat transfer rate from a body [...]

Efficiency of a Flat-plate Solar Collector with Water-based MWCNT Nanofluids

Lee S-H., Jang S.P., Korea Aerospace University, KR

In this paper, the efficiency of nanofluid-based flat-plate solar collector is analytically evaluated by use of the extinction coefficient of nanofluids. The water-based multi wall carbon nanotube (MWCNT) nanofluids and water-based Ag nanofluids are selected [...]

Size-Dependent Separation of Human Mesenchymal Stem Cells by Applying Microfluidic Chip Filtration

Yu S.-Y., Yoo J-H, Chun M.-S., Chang M.-S., Korea Institute of Science and Technology (KIST), KR

It is important to separate human bone marrow-derived mesenchymal stem cells (hMSCs) with high multipotential to differentiation and to increase efficacy of cell therapy. We investigated to develop and validate a novel method for collection [...]

High throughput leukemia cell(k-562) sorting system based on negative dielectrophoretic force

Kim B., Kim Y., Lee D., Kim B., Kim Y., Korea Aerospace University, KR

For high throughput and high separation efficiency, the proposed sorting platform comprises meso-size vertical channel and silicon wafer based micro cantilever-type electrodes for generating n-DEP force and playing a role of micro-channel. To reduce engineering [...]

Secondary Microflows in Electrokinetic Transport with Hydrodynamic Slippage Effect

Kim K.S., Chun M.-S., Byun Y.T., Woo D.H., Korea Institute of Science and Technology (KIST), KR

The curved microchannel is frequently encountered in the lab-on-chips because it provides a convenient way for increasing channel length per unit area. The behavior of electrokinetic flow with curvature-induced secondary motion was explored based on [...]

Repeated Duplication in EHD Line Patterning on a Non-Conductive Substrate Based on Controlling the Polarity of Applied Voltages

Son S., Lee S., Choi J., Sungkyunkwan University, KR

This paper addresses the EHD printing of a high aspect ratio of metal lines as a means of forming a high conductivity of metal lines. As stated earlier, EHD printing is advantageous over conventional inkjet [...]

Redesign of Magnetostrictive Inkjet PrintHead

Yoon K.H., Park Y.W., Wereley N.W., Park Y.W., Chungnam National University, KR

One of the challenges is to design a proper inkjet printhead for demanding trend. Current inkjet printheads are mostly based on either piezoelectricity or heat. This paper presents an inkjet printhead using a magnetostrictive principle. [...]

Transient Analysis on Nonlinear Model of Electrostatically Actuated Nanomechanical Switch

Kim I.K., Han D.H., Lee S.I., University of Seoul, KR

This research predicted the transient behaviors of a nano-switch with static and dynamic analysis. The nano-switch consists of a cantilevered MWCNT incorporating the electrostatic forces and intermolecular attractive and repulsive forces between the CNT and [...]

Pressure dependence of phase transition of organic material, 9,10-di(2-naphthyl)anthracene (ADN), under vacuum

Kim J.T., Shim S., Yun J.Y., Kwon O.H., KRISS, KR

Phase transition characteristics of an organic material, 9,10-di(2-naphthyl)anthracene(ADN), used for Organic Light Emitting Diode(OLED) is evaluated under vacuum. The phase transition shows up as plateau in a temperature curve of ADN material when it is [...]