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탄소나노튜브가 첨가된 폴리술폰 지지체가 폴리아미드 역삼투막의 성능에 미치는 영향
민충식,김승현 대한상하수도학회 2020 상하수도학회지 Vol.34 No.2
In this study, a MWCNT(multi-wall carbon nanotube) was added to polysulfone(PSf) support layer to improve flux of TFC(thin film composite) RO(reverse osmosis) membrane. Two different kinds of MWCNT were used. Surfaces of some MWCNTs were modified hydrophilically through acid treatment, while those of other MWCNTs were modified through heat treatment to maintain their hydrophobicity. MWCNT/PSf support layer was prepared by adding PSf to the NMP mixed solvent containing 0.1 wt% MWCNTs using a phase inversion method. The surface porosity of the MWCNT/PSf support increased by 42~46% while its surface pore size being maintained. The TFC RO membrane made of MWCNT/PSf support layer showed a 20% flux increase while its salt rejection characteristics is sustained. In addition, the MWCNT/PSf support layer has better mechanical stability than the PSf support layer, there resulting in an increased resistance of flux reduction due to physical pressure.
내화피복재를 도포한 고강도 콘크리트 부재의 온도이력 평가
민충식 ( Min Choong-sic ),김규용 ( Kim Gyu-yong ),미야우치히로유키 ( Miyauchi-hiroyuki ),이태규 ( Lee Tae-gyu ),이광준 ( Lee Gwang-jun ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In this study, We calculate that optimum thickness of coating is 2.8~3.5mm measured results in preliminary experiments with small specimens. Which in the member of short collum by applying, compares with member of short collum mixed with fibers' results and evaluation of fire resistance. Thickness of coating 2.8mm member occurred spalling within lhour, Temperature history of 3.5mm member is 100°C lower than mixed with fibers. However, we found Spalling phenomena at corner of member, and suggest that prevent Spalling a minimum thickness of coating that offers more than 3.5mm.