Youn Soo Kim

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Partially purified paeoniflorin (PF), a new cosmetic ingredient from roots of Paeoniae lactiflora, has been developed. Its paeoniflorin content is about 64%, far higher than that of conventional, cosmetic-grade peony root extracts (approximately 10%). In this report, we studied the effects of PF on UV-induced DNA damage in both cultured human keratinocytes(More)
Electrostatic repulsion, long used for attenuating surface friction, is not typically employed for the design of bulk structural materials. We recently developed a hydrogel with a layered structure consisting of cofacially oriented electrolyte nanosheets. Because this unusual geometry imparts a large anisotropic electrostatic repulsion to the hydrogel(More)
The electrocatalytic activities of nanoporous palladium (npPd) and platinum (npPt) for oxygen reduction reaction (ORR) under alkaline conditions and hydrogen peroxide electrochemical reactions under neutral conditions were examined. npPd and npPt were prepared by the electrochemical deposition of each metal from the corresponding metal precursor in the(More)
derived from modified smooth muscle cells known as glomus cells. These tumors are commonly found beneath the fingernails, but also occur in many other locations and rarely in visceral organs. They may be present at birth or may also appear multiple. Glomangiomyoma is the least frequent histopathologic type of the glomus tumor, and the case on the face(More)
Gold nanoparticles (AuNPs) were assembled with high density onto multi-walled carbon nanotubes, which were functionalized with zwitterionic poly(imidazoliumsulfonate). The AuNP/zwitterionic CNT hybrids exhibited decent electrocatalytic activity in oxygen reduction reaction as the AuNP-based catalysts.
We prepared poly(N-isopropylacrylamide-r-N-3-(aminopropyl)methacrylamide) (poly(NIPAAm-r-NAPMAm)) gels with poly NIPAAm (PNIPAAm) grafted only in the surface region (so-called thermoresponsive "surface-grafted gels") with various graft densities, and investigated the effect of the graft density on the bulk properties, such as shrinking and swelling, in(More)
A series of palladium nanoparticles supported on carbon nanotubes (CNTs), which were functionalized covalently with imidazolium polymer salts with different anions, Pd/polyIL(X)-CNTs (IL=ionic liquid; X=Cl, Br, I, ClO(4), BF(4), PF(6)), were prepared to investigate the influence of imidazolim salt anions on electrocatalytic activity in the oxygen reduction(More)
Fluids that contain ordered nanostructures with periodic distances in the visible-wavelength range, anomalously exhibit structural colours that can be rapidly modulated by external stimuli. Indeed, some fish can dynamically change colour by modulating the periodic distance of crystalline guanine sheets cofacially oriented in their fluid cytoplasm. Here we(More)
We report remarkable metal-free electrocatalytic activities of the imidazolium salt-functionalized ionic multi-walled carbon nanotubes (IM-f-MWCNTs) in the oxygen reduction reaction (ORR). The electrocatalytic activity can be attributed to the induced polarization of the π-electrons of CNTs, thus accelerating interfacial electron transfer. The zwitterionic(More)
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