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LaCl<SUB>3</SUB>- CsCl 2성분계 용융염의 점도
김기호(Kiho Kim) 한국표면공학회 2013 한국표면공학회지 Vol.46 No.2
Viscosities of LaCl3-CsCl binary melts were measured by the capillary method over the range of their liquidus temperatures to about 1200 K. The cell constant were determined by using pure water. The results obtained are summerized as follows: Viscosities of melted LaCl3 were decreased with the content of CsCl for all over the composition range of binary melts. Composition versus viscosity relation for the binary melt showed a non-linear relationship from the additivity line and the deviations showed a maximum value at about 60 mol% CsCl. This suggest the existence of the complex ion of LaCl4<SUP>?</SUP> in the melt. Activation energy for the viscous flow of the binary melts decreased monotonously with the increasing content of CsCl after a few increasement till 40 mol% CsCl. All of these results were the resemble with the viscosities of LaCl3<SUP>-</SUP> NaCl binary melts.
김기호(Kiho Kim) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.1
Electric conductivities of LaCl₃-KCl binary melts have been measured by the Kohlausch bridge method over the range from their liquidus temperatures to about 1280 K. The electric conductivity increased with the content of KCl for all over the composition range of binary melts. The composition dependence of the electric conductivity and molar conductivity for the binary melt showed a non-linear relation from the additivity line, and the deviation showed a maximum value at about 60 mol.% KCl. The deviation implies the existence of complex ion of LaCl<SUP>4?</SUP> in the melt. Activation energy for electric conductivity of the binary melts decreased monotonously with increasing content of KCl.
Kiho Kim(김기호),Jinglei Yang,Jooheon Kim(김주헌) 한국고분자학회 2018 폴리머 Vol.42 No.5
고방열 복합소재를 위하여 고분자 경화 유무에 따른 두 가지 종류의 표면처리된 탄소나노튜브/알루미나/ETDS(epoxy-terminated dimethylsiloxane)복합체를 제작하였다. 탄소나노튜브는 산처리 후 실란커플링제 및 dodecylamine을 이용하여 표면처리를 진행하였다. 실란커플링제와의 반응 메커니즘은 반응조건에 따라 조절되었다. 탄소나노튜브 표면처리에 따른 열전도도 특성 변화를 70 w% 알루미나/ETDS 복합체를 기반으로 확인하였다. 탄소나노튜브 표면처리의 효과는 복합소재의 종류에 따라 상이한 경향을 보이는데, 패드 형태의 복합소재에서는 아민기가 말단으로 위치할 때 가장 우수한 열전도도 특성을 보이는 반면 그리스 형태의 복합소재에서는 긴 탄소사슬이 말단에 위치한 구조가 가장 높은 열전도 특성을 보였다. 또한, 실란올기가 말단에 위치할 때 탄소나노튜브의 복합화 가능한 함량이 가장 높아져, 표면처리 방법에 따른 탄소나노튜브의 최대 함량 및 열전도도 차이가 나타나는 것을 확인하였다. Two kinds of surface-modified MWCNT/Al2O3/ETDS composites, cured pad and uncured grease, were fabricated for high-thermal-conductivity materials application. MWCNTs were modified using aminoproplytriethoxysilane (APTES) and dodecylamine after acid treatment. The reaction mechanism of APTES and the surface structure of MWCNT was controlled using different reaction conditions. The effect of surface modification on the thermal conductivity was confirmed based on a 70 wt% Al2O3/ETDS composite. The thermal conductivity was found to be dependent on the composite type and surface structure of the modified MWCNTs; the amine-terminated MWCNTs showed the highest thermal conductivity among the pad type composites, while long carbon chain-terminated MWCNTs showed outstanding performance among the grease type composites. Moreover, the maximum processable MWCNT content was also influenced by the surface modification; structurally similar silanol groups affected the molecular mobility of the ETDS resin and they had the highest MWCNT content under the same process conditions.