Chung J.W. – TechConnect Briefs

Uniqueness of intraband plasmon dispersion of a single layer graphene

Shin S.Y., Hwang C.G., Sung S.J., Lee P.L., Kim J.G., Kim N.D., Kim J.G., Kim N.D., Chung J.W., Pohang University of Science and Technology, KR

we studied the dispersion of intraband plasmon excitation of a single layer graphene(SLG) formed on 6H-SiC(0001) surface by using high-resolution electron energy loss spectroscopy. The dispersion w(q) measured from SLG appears to be quite different [...]

Mesoporous Titanium Dioxide Sphere with Anatase-Type Crystalline Structure using Cyclodextrin as Templates for Nano-sized Pore with Narrow Size Distribution

Chung J.W., Kim H.-J., Kwak S-Y, Seoul National University, KR

Mesoporous titanium dioxide (CD-TiO2) sphere with pore diameter in several nanometers and narrow pore size distribution was prepared from beta-cyclodextrin (beta-CD) and titanium precursor via sol-gel reaction in aqueous acidic condition. beta-CD was used as [...]

Novel Supramolecules Based on Architecturally Variant alpha-Cyclodextrin Polyrotaxanes and Nanorod-Like alpha-Cyclodextrin Self-Assembly

Chung J.W., Yu B.-Y., Kwak S-Y, Seoul National University, KR

Self-assembly (SA-ICs) of architecturally variant alpha-cyclodextrin (alpha-CD) inclusion complexes (ICs) formed by host-guest reaction with four polymeric guest having different molecular architectures (star-shaped, hyperbranched, diblocked, and linear polymer) and nanorod-like self-assembly (SA-CD) of alpha-CD could [...]

Effects of the Addition of TiO2 Nanoparticles for Polymer Electrolytes Based on Porous Poly(vinylidene fluoride-co-hexafluoropropylene)/Poly(ethylene oxide-co-ethylene carbonate) Membranes

Jeon J-D, Kim M-J, Chung J.W., Kwak S-Y, Seoul National University, KR

In order to ameliorate the performance of polymer electrolytes, we report on a novel solvent-free polymer electrolyte filled with viscous poly(ethylene oxide-co-ethylene carbonate) (P(EO-EC)) into a porous membrane. In addition, to enhance the conductivity and [...]

Evaluation of the Degree of Exfoliation in Poly(epsilon-caprolactone) Nanocomposites Using by the Dynamic Mechanical Analysis

Chung J.W., Jeon J-D, Kwak S-Y, Seoul National University, KR

Nanocomposites composed of poly(epsilon-caprolactone) (PCL) and the organoclays which were layered silicate with the organic modifiers, i.e., nonpolar (OC25A) and polar (OC30B), were prepared by melt mixing. After mixing, we imposed additional heat to PCL/organoclay [...]