10 Result(s)

Article

Fast Proton Conductors from Inorganic-Organic Composites: II. Amorphous Phosphate-PTFE and ZrP-PTFE Composites

A high proton-conductivity was observed in the composite of amorphous phosphate and polytetafluoroethylene (PTFE). Incorporation of amorphous phosphate into PTFE emulsion caused a large increase of conductivit...

Yong-Il Park, Jae-Dong Kim, Masayuki Nagai in MRS Online Proceedings Library (1999)

Article

Fast Proton Conductors from Inorganic-Organic Composites: I. Amorphous Phosphate-Nafion and Silicophosphate-PMA/PWA Hybrids

A drastic increase of electrical conductivity was observed in the composite of amorphous phosphate and ion-exchange resins (Nafion) as phosphorus concentration increased. Incorporation of amorphous phosphate i...

Yong-Il Park, Jae-Dong Kim, Masayuki Nagai in MRS Online Proceedings Library (1999)

Article

Proton conductivity in amorphous phosphate–PTFE composite

Yong-Il Park, Jae-Dong Kim, M. Nagai in Journal of Materials Science Letters (2000)

Article

High proton conductivity in ZrP-PTFE composites

Yong-Il Park, Jae-Dong Kim, M. Nagai in Journal of Materials Science Letters (2000)

Article

Effect of composition on ferroelectric properties of sol-gel derived lead bismuth titanate (PbBi4Ti4O15) thin films

Bismuth layer-structured ferroelectric PbBi₄Ti₄O₁₅(PBT) thin films were fabricated on Pt/Ti/SiO₂/Si substrates by sol-gel spin coating and the effect of lead and bismuth concentration on phase transition, microst...

Yong-Il Park, Masayuki Nagai, Masaru Miyayama… in Journal of Materials Science (2001)

Article

Effect of heating temperature on dielectric properties of Pb(Zr,Ti)O3 [PZT] fibers

Ferroelectric Pb(Zr_0.53Ti_0.47)O₃ fibers were reproducibly fabricated by sol-gel technique using triethanolamine (TEA) complexed alkoxide. The phase transition from pyrochlore to perovskite took place about 400°C ...

Yong-Il Park, Masayuki Nagai, Masaru Miyayama… in Journal of Materials Science (2001)

Article

Novel hydrophobic coating process for gas diffusion layer in PEMFCs

The behavior of water and gas distribution in the gas diffusion layers (GDLs) of proton exchange membrane fuel cells (PEMFCs) were investigated analytically. In order to prevent the flooding phenomenon of the ...

Gug-Ho Yoon, Sung Bum Park, Eun Hyung Kim, Myung-Hoon Oh… in Journal of Electroceramics (2007)

Article

Properties of modified Nafion® membranes with heavy amount of (3-mercaptopropyl) trimethoxysilane prepared by long-term infiltration

Modified Nafion® membranes with a large amount of (3-mercaptopropyl) trimethoxysilane (MPTS) were fabricated by a long-term infiltration process. MPTS has been known as a strong surface modifier due to its abi...

Hyejung Lee, Sung Bum Park, Myng-Hoon Oh, Sung** Kim… in Metals and Materials International (2010)

Article

Macromolecules isolated from Phellinus pini fruiting body: Chemical characterization and antiviral activity

Two major polymers, EP-AV1 and EP-AV2, were purified from the hot-water extract of the Porodaedalea pini (Brot.) Murrill (syn. Phellinus pini) fruiting body by 75% ethanol precipitation and size-exclusion chromat...

Sae Mi Lee, Sung Min Kim, Yoon Hee Lee, Woo Jung Kim… in Macromolecular Research (2010)

Article

Biochemical properties of water soluble polysaccharides from photosynthetic marine microalgae Tetraselmis species

Water soluble polysaccharides (WSPs) were isolated from defatted microalgae Tetraselmis sp. KCTC 12432 BP (T.S1) and KCTC 12236 BP (T.S2), and purified by a combination of ethanol precipitation, immobilized metal...

Babita Dogra, Shaheen Amna, Yong Il Park, Jae Kweon Park in Macromolecular Research (2017)