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거대기공 구조-역오팔 또는 중공 구조를 갖는 KIT-1 메조포러스 실리케이트의 제조
백연경,이정구,김영국,Baek, Youn-Kyoung,Lee, Jung-Goo,Kim, Young Kuk 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.3
We report a facile method for preparing KIT-1 mesoporous silicates with two different macroporous structures by dual templating. As a template for macropores, polystyrene (PS) beads are assembled into uniform three dimensional arrays by ice templating, i.e., by growing ice crystals during the freezing process of the particle suspension. Then, the polymeric templates are directly introduced into the precursor-gel solution with cationic surfactants for templating the mesopores, which is followed by hydrothermal crystallization and calcination. Later, by burning out the PS beads and the surfactants, KIT-1 mesoporous silicates with macropores are produced in a powder form. The macroporous structures of the silicates can be controlled by changing the amount of EDTANa4 salt under the same templating conditions using the PS beads and inverse-opal or hollow structures can be obtained. This strategy to prepare mesoporous powders with controllable macrostructures is potentially useful for various applications especially those dealing with bulky molecules such as, catalysis, separation, drug carriers and environmental adsorbents.
Development of High Performance Magnetic Materials based on Metastable Phases
백연경,이정구 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Iron based magnetic materials with metastable phases have been suggested as a one of the most promising candidate as a future rare-earth free permanent magnet due to their advantages such as abundant amount of Fe on the earth and its large saturation magnetization. Especially, large magnetocrystalline anisotropy can be induced by inducing metastable phases or shapes. Thus, researchers have developed the various synthesis methods to form metastable phases of iron based magnetic particles via wet chemical, ball milling and plasma process etc. In this study, we have developed synthetic approaches to fabricate various iron based magnetic particles for advanced magnetic properties. This strategy used in this work would pave the way for the industrial production of high performance rare-earth free magnetic materials based on metastable iron phases. <sup>**</sup> This research was supported financially by the Fundamental Research Program (PNK 6040) of Korea Institute of Materials Science.
Fabrication of Magnetic Nanoparticles /Hexagonal Boron Nitride Platelets Composite Powders
백연경,이은진,김영국 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Hexagonal boron nitride (hBN) is an important wide-gap semiconductor with excellent thermal and electrical properties. Especially, the thermal conductivity of hBN in the horizontal direction is the highest among the other electrically insulating materials such as alumina, silica and etc. Thus, hBN can be potentially used for electronic applications such as thermal interface materials for semiconductor packaging. Especially, alignment of hBN platelets is very important to obtain thermal conducting paths for the practical applications. Magnetic particles are effective to align along the magnetic field flux. Thus, we have synthesized a magnetic h-BN composite powders and aligned the platelets in the polymer matrix under a magnetic field.