Kim J. – Page 2 – TechConnect Briefs

Strain effect on the hydrogen storage capacity of graphite oxide

Kim J., Seo M., Kim J., Kang S., Seoul National Univ., KR

Among clean fuel alternatives hydrogen is one of the most attractive fuels due to its abundance, easy synthesis, and non-polluting nature when used in fuel cells. Recently carbon-based materials which have high specific surface area [...]

Retarded Growth of Nano-sized Carbide Particles in Liquid Metals at 1500°C

Kim J., Kim J., Seo M., Kim J., Kang S., Seoul National Univ., KR

The nanocrystalline solid-solution carbide powders were prepared by carbo-thermal reduction after high-energy planetary milling of proper oxide mixture. Then, particle growth behaviours of nanocrystalline transitional metal carbides such as (W,V)C and (Ti,W,M1,M2)(CN) were investigated and [...]

Size dependent photoluminescence characteristics of GaN nanoparticles

Chen Y., Kang K.S., Jyoti N., Kim J., Inha University, KR

Various size of GaN nanoparticles have been fabricated with sol-gel method using Ga(NO3)3 as a presusor, HNO3 as a solvent, NH3OH as a pH adjusting agent, and citric acid as a chelating agent. After adding [...]

Nano-Electrodeposits of MEMS Directional Microphones for Hearing Aid Optimization

Je S.-S., Kim J., Kozicki M.N., Chae J., Arizona State University, US

We present an in-situ non-electronic method for MEMS (Micro-Electro-Mechanical-Systems) microphone optimization by sensitivity adjustment via the growth/retraction of nano-electrodeposits to achieve high directionality in hearing aid applications. Using a DC bias at room temperature, nano-electrodeposits [...]

Functional nanowire microscopy tip

Kim J., Shin Y-H, Yun J.H., Han C-S, Hyun M.S., Korea Institute of Machinery and Materials (KIMM), KR

Excellent electric conductive nickel silicide (NiSi) nanowire (NW) was aligned on a conventional Si tip and performed as an electric force microscopy (EFM) probe. Single crystalline structured NiSi NW was grown in plasma-enhanced chemical vapor [...]

Surface plasmon polariton assisted organic solar cells

Kim C., Kim J., Lee J-Y, Peumans P., Kim C., Kim J., Duke University, US

A fundamental limitation of organic photovoltaic (OPV) cells is due to the trade-off between light absorption and exciton diffusion. We show that light absorption in an OPV cell can be enhanced by replacing a conventional [...]

New Finite Element Method Modeling for contractile Forces of Cardiomyocytes on Hybrid Biopolymer Microcantilevers

Na K., Kim J., Yang S., Yoon E-S, Yoon Y.M., Yoon E-S, Yoon Y.M., Korea Institute of Science and Technology, KR

Measurement of magnitude and frequency of cardiomyocyte contraction is significant not only for real-time monitoring of the toxicity of chemicals on cardiomyocyte, but also for understanding of the mechanisms of heart failure. Researches on measuring [...]

Nanomechanical characterization of UV curable hyperbranched polymers

Kim J., Chen Z., Chisholm B., Patel S., North Dakota State University, US

Hyperbranched polymers were explored to develop UV-curable, protective coatings for aluminum 2024-T3 and their viscoelastic and mechanical properties were characterized using nanoindentation techniques. The coating system consists of a hyperbranched polyester acrylate (CN2300, Sartomer Inc), [...]

Surface plasmon polariton assisted organic solar cells

Kim C., Kim J., Lee J-Y, Peumans P., Kim C., Kim J., Duke University, US

A fundamental limitation of organic photovoltaic (OPV) cells is due to the trade-off between light absorption and exciton diffusion. We show that light absorption in an OPV cell can be enhanced by replacing a conventional [...]

Synchrotron X-Ray Scattering Studies of Star-Shape Polymers

Jin K.S., Jin S., Higashihara T., Jin K.S., Jin S., Yoon J., Heo K., Kim J., Kim K.W., Kim J., Kim K.W., Hirao A., Ree M., Pohang University of Science and Technology, KR

The physical properties of well-defined star-shape polystyrenes with high number of arms (6 to 57 arms) in good and theta solvents were studied using synchrotron X-ray scattering. The scattering profiles for multi-armed polystyrenes shown the [...]