https://pubs.kist.re.kr/handle/123456789/75361 Sat, 14 Feb 2026 01:56:07 GMT 2026-02-14T01:56:07Z https://pubs.kist.re.kr/handle/201004/134802 Title: Doping effect of precious metal on the activity of CuO-CeO2 catalyst for selective oxidation of CO Authors: Jung, Chang Ryul; Kundu, Arunabha; Nam, Suk Woo; Lee, Ho-In Abstract: Precious metals (Pt, Pd and Ru)-doped copper oxide-ceria (CuO-CeO2) catalysts were prepared by a combination of conventional co-precipitation and impregnation methods and evaluated for the selective oxidation of carbon monoxide in a hydrogen-rich gas stream. It was found that the doping with the precious metal did not change the crystal structure of the catalyst. The binding energy of copper in the precious metal-doped CuO-CeO2 catalyst shifted to a higher value. This indicates that a part of the copper in the CuO-CeO2 catalyst is phase-separated and there is some possibility of the formation of copper chloride on the surface of the catalyst. The added precious metal inhibited the phase separation of copper. The degree of phase separation depended on the type of precious metal and the amount of precious metal loading. The catalytic activity for selective oxidation of carbon monoxide (CO) was the highest in the case of Pt-doped catalyst due to the strong interaction between doped Pt and CuO-CeO2 catalyst. However, the activity of Pd- or Ru-doped catalyst for selective oxidation of CO was much less because doped Pd and Ru have good activity for hydrogen oxidation. (C) 2007 Elsevier B.V. All rights reserved. Mon, 01 Jan 2007 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/134802 2007-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/134801 Title: Unprecedented coloration of rutile titanium dioxide nanocrystalline thin films Authors: Mane, Rajaram S.; Joo, Oh-Shim; Lee, Won Joo; Han, Sung-Hwan Abstract: In this communication, TiO2 nanocrystalline thin films synthesized by a room temperature (27 degrees C) chemical dip process. To our knowledge, this is first report of the preparation of nanoscale rutile TiO2 particles from common inorganic salt at such low temperature. Interestingly, unprecedented dynamic color change accompanies with titanium dioxide grain size, which can be seen with the naked eye that generated curiosity in our mind to check UV-vis absorption, where significant changes were observed. The room temperature synthesized thin films of rutile titanium dioxide make it a potential candidate for high-compatibility material, which can be used in artificial heart valves. (c) 2006 Elsevier Ltd. All rights reserved. Mon, 01 Jan 2007 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/134801 2007-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/134800 Title: Oxygen, nitric oxide and articular cartilage Authors: Fermor, B.; Christensen, S. E.; Youn, I.; Cernanec, J. M.; Davies, C. M.; Weinberg, B. Abstract: Molecular oxygen is required for the production of nitric oxide ( NO), a pro-inflammatory mediator that is associated with osteoarthritis and rheumatoid arthritis. To date there has been little consideration of the role of oxygen tension in the regulation of nitric oxide production associated with arthritis. Oxygen tension may be particularly relevant to articular cartilage since it is avascular and therefore exists at a reduced oxygen tension. The superficial zone exists at approximately 6% O-2, while the deep zone exists at less than 1% O-2. Furthermore, oxygen tension can alter matrix synthesis, and the material properties of articular cartilage in vitro. The increase in nitric oxide associated with arthritis can be caused by pro-inflammatory cytokines and mechanical stress. Oxygen tension significantly alters endogenous NO production in articular cartilage, as well as the stimulation of NO in response to both mechanical loading and proinflammatory cytokines. Mechanical loading and proinflammatory cytokines also increase the production of prostaglandin E2 ( PGE(2)). There is a complex interaction between NO and PGE(2), and oxygen tension can alter this interaction. These findings suggest that the relatively low levels of oxygen within the joint may have significant influences on the metabolic activity, and inflammatory response of cartilage as compared to ambient levels. A better understanding of the role of oxygen in the production of inflammatory mediators in response to mechanical loading, or pro-inflammatory cytokines, may aid in the development of strategies for therapeutic intervention in arthritis. Mon, 01 Jan 2007 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/134800 2007-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/134799 Title: Magnetic properties of Mn-Zn ferrite nanoparticles fabricated by conventional ball-milling Authors: Je, H.-J.; Kim, B.-K. Abstract: Mn-Zn ferrite nanoparticles were fabricated via conventional ball-milling and their magnetic properties were investigated. By ball-milling of Mn 0.53Zn0.42Fe2.05O4 agglomerates for 48h with and without a dispersant (Darvan-C (ammonium polymethacrylate)), nanoparticles having average particle size of 60 nm were obtained. The saturation magnetizations (Ms) of thus obtained Mn-Zn ferrite nanoparticles were 49 and 62 emu/g for dispersant-added and dispersant-non-added one, respectively. When the nanoparticles were heat-treated at 400°C, however, the Ms became comparable: 63 and 65 emu/g. When the nanoparticles were heat-treated at 600°C, moreover, the Ms became comparable with that of bulk ferrites: 75-78 emu/g. These magnetic properties were attributed to the surface spin disorder effects resulting from the coating of organic dispersant molecules on the surfaces of the nanoparticles as well the structural disorder on the surfaces the nanoparticles. Mon, 01 Jan 2007 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/134799 2007-01-01T00:00:00Z