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Kim Joong Hyun,Park HyeungWoo,서수원 나노기술연구협의회 2017 Nano Convergence Vol.4 No.33
We developed a straightforward method to fabricate antibacterial silicon films via the in situ synthesis of silver nanoparticles (AgNPs) on a polydimethylsiloxane (PDMS) film. To grow AgNPs attached on the film, AgNP seeds were synthesized through the reduction of silver ions electrostatically bound to hydroxyl groups formed on the surface of the film after treatment with air plasma. In the growth reaction, silver ions were reduced on the seeds of AgNPs by sodium citrate in a solution of AgNO3, which allowed for the formation of AgNPs with sizes of up to ~ 500 nm, which The formed AgNPs on the films were characterized using UV–vis spectrophotometer, scattering electron microscope and induced coupled mass spectrometer. The amount of AgNPs was estimated to be less than 0.05% of the total film weight. Even though it was coated with a small amount of AgNPs, the PDMS film exhibited reduction of E. coli and S. aureus with values of log10 4.8 and log10 5.7, respectively. The biosafety of the AgNP-attached PDMS film was examined by contact of cells with the film or film eluent. Counting of viable cells revealed no significant cytotoxicity of the in situ-fabricated AgNPs on the PDMS film.
유럽시장 대응을 위한 촉매형 매연 여과 장치 매핑 전략
허행표(Haengpyo Heo),박성근(Sunggeun Park),이흥우(Hyeungwoo Lee),지요한(Yohan Chi),윤금중(Kumjung Yoon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Increasing demands for clean air and better fuel consumption have led to the greater penetration of diesel passenger cars equipped with diesel particulate filters. In order to drastically reduce the particulate emission in all the engine operating conditions Catalyzed particulate filter has been developed for serial passenger cars. The exhaust gas temperature required for the filter regeneration was found to be achievable in all driving situation through a smart management of up to five multiple injections and air mass without an unacceptable increase of fuel consumption or noticeable change in vehicle drivability. The features and performance of the control system and engine, aftertreatment developed are presented in this paper.