In this work, a nickel metal (Ni) electroplating on the activated carbon fiber (Ni/ACFs) surfaces was carried out to remove the toxic hydrogen chloride (HCl) gas. The surface properties of the treated ACFs were determined by using nitrogen adsorption isotherms at 77 K, SEM, and X-ray diffraction (XRD) measurements. HCl removal efficiency was confirmed by a gas-detecting tube technique. As a result, the nickel metal contents on the ACF surfaces were increased with increasing the plating time. And, it was found that the specific surface area or the micropore volume of the ACFs studied was slightly decreased as increasing the plating time. Whereas, it was revealed that the HCl removal efficiency containing nickel metal showed higher efficiency values than that of untreated ACFs. These results indicated that the presence of nickel metal on the ACF surfaces played an important role in improving the HCl removal over the Ni/ACFs, due to the catalytic reactions between nickel and chlorine.

PTMSP-PEI 복합막과 PTMSP-Silica-PEI 복합막을 제조하고, 막의 특성을 FT-IR, GPC, SEM 등을 사용하여 조사하였다. PTMSP-Silica-PEI 복합막은 silica의 함량이 23∼60 wt%로 증가하면서 입자의 크기는 점차 작아지고 입자의 분포는 균일하게 되었다. PTMSP-PEI 복합막과 PTMSP-Silica-PEI 복합막에 의한 H2/N2 혼합기체분리는 25{℃, ΔP 5 psi∼30 psi 범위에서 조사되었다. PTMSP-PEI 복합막과 PTMSP-Silica-PEI 복합막들의 수소에 대한 분리인자(α, β, (equation omitted)) 값은 투과셀의 압력이 증가할수록 그리고 silica의 함량이 증가할수록 증가하였다. 25{℃, ΔP 30 psi에서 PTMSP-PEI 복합막의 수소에 대한 α, β, (equation omitted) 값은 2.28, 1.58, 1.44이고 silica 60 wt%인 PTMSP-Silica-PEI 복합막의 수소에 대한 α, β, (equation omitted) 값은 3.34, 1.95, 1.72 이었다.

We investigated the antiplatelet effect of a newly synthesized guanidine derivative KR-32558, a sodium-hydrogen exchanger-1 (NHE-1) inhibitor, together with the elucidation of the possible mechanisms of action. KR-32558 concentration -dependently inhibited the aggregation of washed rabbit platelets induced by collagen (10 μg/ml) with an IC_(50) value of 85.9 μM, but with much weaker potency against aggregation induced by thapsigargin (0.5 μM) or A23187 (5 μM). And had no effect on platelet aggregation induced by arachidonic acid (100 μM), thrombin (0.05 U/ml) and U46619 (1 μM) up to 100 μM. KR-32558 completely inhibited the [Ca^(2+)] mobilization induced by collagen at concentration of 100μiM. Taken together, these observations suggest that KR-32558 selectively inhibited collagen-mediated platelet aggregation by blocking the cytoplasmic calcium mobilization in addition to NHE-1 inhibition.

The atmospheric pressure plasma treatments (Ar/O2 and Ar/N2) of activated carbon fibers (ACFs) were carried out to introduce hydrophilic functional groups on carbon surfaces in order to enhance the hydrogen chloride gas (HCl) adsorption. Surface properties of the ACFs were determined by XPS and SEM. N2/77 K adsorption isotherms were investigated by BET and D-R (Dubinin-Radushkevich) plot methods. The HCl removal efficiency was confirmed by HCl detecting tubes (range:1~40 or 40~1000 ppm). As experimental results, it was found that all plasma-treated ACFs showed the decrease in the pore volume, but the HCl removal efficiency showed higher level than that of the untreated ACFs. This result indicated that the plasma treatments led to the conformation of hydrophilic functional groups on the carbon surfaces, resulting in the increase of the interaction between the ACFs and HCl gas.

원자력 발전의 고온 가스로(high temperature gas-cooled reactor, HTGR)의 냉각제로 사용되는 He가스의 열에너지를 이용하여 물을 분해해서 수소를 생산하는 "열화학적 수소제조 IS프로세스"에 대해 설명하였다. 특히, 분리막 기술의 이용에 관한 연구를 중점으로 정리하였다. 고온 원자력 열에너지를 이용한 열화학적 수소 제조법은 실현 가능한 단계까지 왔다고 생각되며, 아직 연구 개발 과제가 많이 남아 있지만, 미래의 청정에너지 중의 하나인 수소를 대량 생산할 수 있는 가능성을 갖고 있다.

Carbon molecular sieve (CMS) membranes were prepared by pyrolysis of polyimides having carboxylic acid groups and applied to the hydrogen separation. The polymeric membranes having carboxylic acid groups showed different steric properties as compared with polymeric membranes having other side groups (-CH3 and -CF3) because of the hydrogen bond between the carboxylic acid groups. However, the microporous CMS membranes were significantly affected by the decomposable side groups evidenced from the wide angle X-rat diffraction, nitrogen adsorption isotherms, and single gas permeation measurement. Furthermore, the gas separation properties of the CMS membranes were essentially affected by the pyrolysis temperature. As a result, the CMS membranes Prepared by Pyrolysis of polyimide containing carboxylic acid froups at 700℃ showed the H2 permeability of 3,809 Baller [1×10-10 H cm(STP)cm/cm2.s.cmHg], H2/N2, selectivity of 46 and H2/CH4 selectivity of 130 while the CMS membranes derived from polyimide showed the H2 permeability of 3,272 Barrer, H2/N2 selectivity of 136 and H2/CH4 selectivity of 177.

In this study, chemical solution mixing and hydrogen reduction method was used to fabricate nanostructured alloy powders. Fe-Co chloride mixture, FeCl and COCI with 99.9％ purity, were reduced in hydrogen atmosphere. Nanostructured Fe-Co alloy powders with a grain size of 50 nm were successfully fabricated. Magnetic properties of fabricated (x=0, 10, 30, 50, 70, 100) alloy powders with the same grain size were measured because size factor can affect magnetic properties. Coercivity of Fe-Co alloy powders were increased with increasing Co contents. Maximum value of coercivity in various Co contented Fe-Co alloy powders with similar grain size was 125 Oe at Fe. Saturation magnetization value at FeCo composition showed maximum value of 219 emu/g and saturation magnetization value decreased with increasing Co contents and minimum value of 155 emu/g was observed at Co.

The purpose of this study is the fabrication of nano-sized Fe-Co alloy powders with soft magnetic properties by the slurry mixing and hydrogen reduction (SMHR) process. 0 and powders with 99.9% purities were used for synthesizing nanostructured Fe-Co alloy powder. Nano-sized Fe-Co alloy powders were successfully fabricated using SMHR, which was performed at 50 for 1 h in H atmosphere. The fabricated Fe-Co alloy powders showed ' phase (ordered body centered cubic) with the average particle size of 45 nm. The SMHR powder exhibited low coercivity force of 32.5 Oe and saturation magnetization of 214 emu/g.