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변종민,김세훈,김진우,김영문,김영도,Byun, Jong-Min,Kim, Se-Hoon,Kim, Jin-Woo,Kim, Young-Moon,Kim, Young-Do 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.4
In this study, gradient porous Al-Cu sintered body was fabricated by powder metallurgy processing. Al-Cu powder mixtures were prepared by low energy ball milling with various milling time. After ball milling for 3h, the shape of powder mixtures changed to spherical type with size of 100~500 ${\mu}m$. Subsequently, Al-Cu powder mixtures were classified (under 150, 150~300 and over 300 ${\mu}m$) and compacted (20, 50 and 100 MPa). Then, they were sintered at $600^{\circ}C$ for various holding time (10, 30, 60 and 120 min) in $N_2$ atmosphere. The sintered bodies had 32~45% of porosity. As a result, the optimum holding time was determined to be 60 min at $600^{\circ}C$ and sintered bodies with various porosity were obtained by controlling the compacting pressure.
수산화코발트의 초음파 폴리올 합성과 자성 선별법을 이용한 코발트 나노 분말의 제조
변종민,최명환,심창민,김지영,김영도,Byun, Jong Min,Choi, Myoung Hwan,Shim, Chang Min,Kim, Ji Young,Kim, Young Do 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.1
In this study, cobalt nanopowder is fabricated by sonochemical polyol synthesis and magnetic separation method. First, sonochemical polyol synthesis is carried out at $220^{\circ}C$ for up to 120 minutes in diethylene glycol ($C_4H_{10}O_3$). As a result, when sonochemical polyol synthesis is performed for 50 minutes, most of the cobalt precursor ($Co(OH)_2$) is reduced to spherical cobalt nanopowder of approximately 100 nm. In particular, aggregation and growth of cobalt particles are effectively suppressed as compared to common polyol synthesis. Furthermore, in order to obtain finer cobalt nanopowder, magnetic separation method using magnetic property of cobalt is introduced at an early reduction stage of sonochemical polyol synthesis when cobalt and cobalt precursor coexist. Finally, spherical cobalt nanopowder having an average particle size of 22 nm is successfully separated.
계면활성제를 이용하여 anatase TiO<sub>2</sub> 나노 입자와 결합된 rutile TiO<sub>2</sub> 분말의 광촉매 특성
변종민,박천웅,김영인,김영도,Byun, Jong Min,Park, Chun Woong,Kim, Young In,Kim, Young Do 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.3
The coupling of two semiconducting materials is an efficient method to improve photocatalytic activity via the suppression of recombination of electron-hole pairs. In particular, the coupling between two different phases of $TiO_2$, i.e., anatase and rutile, is particularly attractive for photocatalytic activity improvement of rutile $TiO_2$ because these coupled $TiO_2$ powders can retain the benefits of $TiO_2$, one of the best photocatalysts. In this study, anatase $TiO_2$ nanoparticles are synthesized and coupled on the surface of rutile $TiO_2$ powders using a microemulsion method and heat treatment. Triton X-100, as a surfactant, is used to suppress the aggregation of anatase $TiO_2$ nanoparticles and disperse anatase $TiO_2$ nanoparticles uniformly on the surface of rutile $TiO_2$ powders. Rutile $TiO_2$ powders coupled with anatase $TiO_2$ nanoparticles are successfully prepared. Additionally, we compare the photocatalytic activity of these rutile-anatase coupled $TiO_2$ powders under ultraviolet (UV) light and demonstrate that the reason for the improvement of photocatalytic activity is microstructural.
변종민 ( Jong Min Byun ),성영배 ( Yeong Bae Seong ),윤순옥 ( Soon Ock Yoon ) 한국지형학회 2013 한국지형학회지 Vol.20 No.4
8월 27일(화)부터 8월 31일(토)까지 5일간 프랑스 파리에서 국제지형학회 (Internatioal Association of Geomorphologist, 이 하 IAG)가 주 체 하 는 국 제 학 회 (The 8th International Conference on Geomorphology)가 열렸다. IAG가 주관하는 학회는 총회가 함께 열리는 국제학회와 지역학회 (Regional Conference)로 구분되며 각각 4년을 주기로 개최되는데, 이번 학회는 2009년 호주 멜버른 국제학회 이후로 4년 만에 유럽에서 열린 것이다. 이번 학회에는 27개 세션에서 830개의 구두 발표와 981개의 포스터 발표 그리고 5개의 키노트 강연이 열려 전 세계의 지형학자들이 참가한 "올림픽"이라고 해도 과언이 아니었다. 물론 IAG가 영국과 프랑스 등의 유럽 지형학자들이 중심이 된조직이지만, 지형학과 연관된 다양한 국제학술대회 중에 미국과 유럽 외의 지형학자들이 가장 많이 참가하여 각 지역의 최신 이슈를 현지 연구자들의 시각으로 직접 들을 수 있는 소중한 기회였다.