Lee H.J. – TechConnect Briefs

3D Printered and Plasma Treated Superhydrophobic Mesh Filters for Oil-water Separation

Lee H.J., Lee S., Jo W., Lee H.J., Lee S., Moon M.-W., Korea Institute of Science and Technology, KR

We develop the 3D printed mesh filters with plasma treatment using a radio-frequency plasma-enhanced chemical vapor deposition (rf-PECVD) to control their surface wettability. The nano-sclae hairy structures on the meshes are created by plasma etching [...]

3D Printered and Plasma Treated Superhydrophobic Mesh Filters for Oil-water Separation

Lee H.J., Lee S., Jo W., Lee H.J., Lee S., Moon M.-W., Korea Institute of Science and Technology, KR

We develop the 3D printed mesh filters with plasma treatment using a radio-frequency plasma-enhanced chemical vapor deposition (rf-PECVD) to control their surface wettability. The nano-sclae hairy structures on the meshes are created by plasma etching [...]

High Temperature Nanostructures for Thermophotovoltaics

Lee H.J., Smyth K., Kim S-G, Massachusetts Institute of Technology, US

A fundamental challenge in solar-thermal-electrical energy conversion is the thermal stability of nano-engineered materials and devices at high operational temperatures. Selective tungsten emitters based on 2-D photonic crystals have been found effective in controlling the [...]

High Temperature Nanostructures for Thermophotovoltaics

Lee H.J., Smyth K., Kim S-G, Massachusetts Institute of Technology, US

A fundamental challenge in solar-thermal-electrical energy conversion is the thermal stability of nano-engineered materials and devices at high operational temperatures. Selective tungsten emitters based on 2-D photonic crystals have been found effective in controlling the [...]

Thermal Stability of Nano-Structured Selective Emitters for Thermo Photovoltaic

Lee H.J., Bathurst S.P., Kim S-G, Massachusetts Institute of Technology, US

This study aims to provide the high temperature stability of tungsten selective emitters for thermophotovoltaic (TPV) systems. Photonic crystals have periodic nano-structures that are designed to control the motion of photons at certain wavelengths, giving [...]

Thermal Stability of Nano-Structured Selective Emitters for Thermo Photovoltaic

Lee H.J., Bathurst S.P., Kim S-G, Massachusetts Institute of Technology, US

This study aims to provide the high temperature stability of tungsten selective emitters for thermophotovoltaic (TPV) systems. Photonic crystals have periodic nano-structures that are designed to control the motion of photons at certain wavelengths, giving [...]

Multifunctional Micropatterned Nanofiber Capable of Cell Patterning, Metabolite Detection, and Growth Factor Delivery

Koh W.G., Lee H.J., Lee H.W., Lee H.J., Lee H.W., Park S., Yonsei University, KR

This study describes the development of multifunctional nanofiber scaffolds consisting of multiple layers of nanofiber scaffolds and nanofiber-incorporated PEG hydrogels. We fabricated double-layered nanofiber scaffolds that were micropatterned with PEG hydrogels by combining two-step sequential [...]

Nanostructural Effects of Mitomycin C Applications on Scleral Collagen Fibrils: Atomic Force Microscopy Observation

Choi S., Cheong Y., Kwon E., Jung G.B., Lee H.J., Shin J.-H., Jin K.-H., Park H.K., Kyung Hee University, KR

This study was to investigate the effects of Mitomycin C on the scleral collagen surfaces by atomic force microscopy (AFM). Two non-contact mode AFM machines were used to observe changes in the morphological characteristics of [...]

Biological synthesis of copper nanoparticles using plant extract

Lee G., Lee H.J., Lee G., Lee H.J., Jang N.R., Yun J.H., Song J.Y., Kim B.S., Chungbuk National University, KR

Copper nanoparticles were biologically synthesized using plant leaf extract as reducing agent. On treatment of aqueous solutions of CuSO4•5H2O with leaf extract (Magnolia), stable copper nanoparticles were formed. UV-vis spectroscopy was used to monitor the [...]

Analysis of density variation for different temperatures in thermal nano imprinting process

Lee D.E., Lee H.J., Lee W.I., Lee D.E., Lee H.J., Lee W.I., Choi S-W, Lee D.E., Lee H.J., Lee W.I., Seoul National University, KR

Density variation of the polymer resist for different temperatures in thermal nano imprinting1 process was studied by both experiments and molecular dynamics (MD) simulations. After patterning, we estimated the local density by measuring the pull-off [...]