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Effects of Ru Co-Sputtering on the Properties of Porous Ni Thin Films
Woo Sik Kim,김주선,이해원,Sun Hee Choi 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.11
NiO films and Ru co-sputtered NiO films were deposited by reactive magnetron sputtering for micro-solid oxide fuel cell anode applications. The deposited films were reduced to form porous films. The reduction kinetics of the Ru doped NiO film was more sluggish than that of the NiO film, and the resulting microstructure of the former exhibited finer pore networks. The possibility of using the films for the anodes of single chamber micro-SOFCs was investigated using an air/fuel mixed environment. It was found that the abrupt increase in the resistance is suppressed in the Ru co-sputtered film, as compared to undoped film.
Polymer tips for application of atomic force microscopy
Woo-Sik Kim,Kang-Min Park,Jung Jin Park,Sang-Mok Chang,김인호,Hiroshi Muramatsu,김종민 한국물리학회 2007 Current Applied Physics Vol.7 No.5
A hydrophobic polymer tip for atomic force microscopy has been fabricated by two-photon adsorbed photopolymerization tech-niques and has been applied for the high resolution imaging of a hydrophilic metal surface. Using optimized photopolymerization con-ditions, we have succeeded in fabricating sub-100-nm sized polymer tips. This fabricating resolution of two-photon adsorbedphotopolymerization is also conrmed by other supporting experiments. The imaging results show that the capillary-force-induced imagedistortion can be successfully removed by applying a pure hydrophobic polymer tip with a lateral resolution better than 5 nm, which isdicult to achieve with a commercial tip without any environmental control.
Sol-gel Mechanism of Self-Patternable PZT Film Staring from Alkoxides' Precursors
Jae-SeobHwang,WooSikKim,Hyung-HoPark,Tae-SongKim 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.4
Sol-gel preparation technique using a chemical reaction of metal alkoxides has been widely used for the fabrication of various materials including ceramics. However, its mechanism has been studied till now because a number of chemical ways are possible from various alkoxides and additives. In this study, the mechanism of hydrolysis, condensation, and polymerization of alkoxides were investigated from the fabrication of lead-zirconate-titanate (PbZrxTi1-xO3; PZT) thin film that is used as various micro-actuator, transducer, and sensor because of its high electro-mechanical coupling factors and thermal stability. Furthermore, the fabrication process and characteristics of self-patternable PZT film using photosensitive stabilizer were studied in order to resolve the problem of physical damage and properties degradation during dry etching for device fabrication. Using an optimum condition to prepare the self-patternable PZT film, more than 5000 thick self-patternable PZT film could be fabricated by three times coating. The PZT film showed 28.4 μC/cm2 of remnant polarization (Pr) and 37.0 kV/cm of coercive field (Ec).
Root Rot of Moth Orchid Caused by Fusarium spp.
김완규,이병대,조원대,WooSikKim 한국식물병리학회 2002 Plant Pathology Journal Vol.18 No.4
Moth orchid plants with yellowing blight and root rot symptoms were collected, and a total of 54 isolates of Fusarium spp. was obtained from roots and leaf bases of the diseased plants. The isolates were identified based on their morphological characteristics. Out of the 54 isolates of Fusarium spp., 42 isolates were identified as F. solani, 5 isolates as F. oxysporum, and 7 as F. proliferatum. Isolates of the three Fusarium spp. were tested for pathogenicity to moth orchid plants by artificial inoculation. All the Fusarium spp. induced root rot of the host plants. The symptoms progressed up to the basal part of the leaves, which later caused yellowing blight. The symptoms induced on the plants by artificial inoculation with the Fusarium spp. isolates were similar to those observed in greenhouses. The present study reveals that F. oxysporum, F. proliferatum, and F. solani cause root rot of moth orchid, and that F. solani is the main pathogen of the disease.