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고온 수용액으로부터의 고품질 α-Quartz 분말 제조
목영일,이기정,서경원,유효신 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
입자의 크기가 균일하고 양질의 결정성을 갖는 고품질 α-SiO₂단결정 분말을 수열 조건에서 제조하였다. α-SiO₂ 단결정 분말은 300-450℃의 온도 범위와 100-300atm의 압력 범위내에서 3시간 동안의 수열반응을 통해 제조되었다. 반응은 무정형 실리카를 영양제로 사용한 성장용액의 용해도를 증가시키기 위해 KOH, NaOH. Na₂CO₃, KF, NaF와 같은 알칼리와 할로겐 화합물을 광화제로 첨가해서 수열합성시켰으며, 비교적 소량의 첨가에도 우수한 효과를 나타냈다. 수열합성법을 통해 입도가 1-10㎛ 범위내에 해당하고, 육방정의 안정된 결정형을 갖는 α-SiO₂ 단결정 분말을 얻을 수 있었다. XRD, SEM, PSA, FT-IR과 Raman spectrometer를 이용해서 수열합성물의 물성 특성을 비교 분석하였다. In this study powders of high quality α-quartz(α-SiO₂) crystal having uniform particle sizes und high crystallinity were prepared under hydrothermal conditions. The α-quartz powders were prepared after a 3 hours' operation in the temperature range of 300-450℃ and in the pressure range of 100-300atm. Alkali hydroxides and alkali halides such as KOH, NaOH. Na₂CO₃, KF and NaF were found to be effective in this reactions, which added in order to increase the solubility of amorphous silica feedstock. The α-quartz crystal powders were obtained in uniform size of 1-10㎛ with hexagonal structure. The characterization of the synthetic products were carried out using XRD, SEM, PSA, FTIR and Raman spectrometer.
목영일,장보영 ( Young Il Mok,Bo Young Jang ) 한국화학공학회 1978 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.16 No.2
This report is intended to provide the readers with a comprehensive look at the state of the art of composite materials technology, with particular attention on how to go about selecting right material for a given application and inversely finding new applications for a given composition. A rationale is presented herein which reaffirms needs of composite materials presently in use and of further search of better application methods and new and better materials. Much of the up-to-date information has been included in the form of tables and figures. In the course of fulfilling these aims, relevant concepts, methods and classifications are introduced wherever appropriate to relate theoretical aspects of the technology to practical applications.
목영일,박방삼 ( Young Il Mok,Bang Sam Park ) 한국화학공학회 1977 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.15 No.6
This report is intended to give the readers a comprehensive look at the state of the art of size reduction technology, with particular attention on how to go about selecting right equipment and making the best use of existing equipment in order to achieve given service requirements. Much of the up-to-date information has been presented herein in the form of tables which include manufacturers` lists of various operational and analytical equipment. In the course of fulfilling this aim, relavent concepts, methods and classifications, both new and old, are introduced wherever appropriate to relate theoretical aspects to practical applications.