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정재용,홍종팔,김영국,Jung, Jae-Yong,Hong, Jong-Pal,Kim, Young-Kuk 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.4
Over the last decade, the study of the synthesis of semiconductor colloidal quantum dots has progressed at a tremendous rate. Colloidal quantum dots, which possess unique spectral-luminescent characteristics, are of great interest in the development of novel materials and devices, which are promising for use in various fields. Several studies have been carried out on hot injection synthesis methods. However, these methods have been found to be unsuitable for large-capacity synthesis. Therefore, this review paper introduces synthesis methods other than the hot injection synthesis method, to synthesize quantum dots with excellent optical properties, through continuous synthesis and large capacity synthesis. In addition, examples of the application of synthesized colloid quantum dots in displays, solar cells, and bio industries are provided.
한상근(Sang Keun Han),홍종팔(Jong Pal Hong),정원복(won Bok Jeong) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.11
암모늄퍼클로레이트(AP)가 적용된 컴포지트 추진제의 점도와 기계적인 특성은 AP의 형상에 영향을 받는다. HTPB계 추진제에서 대부분 사용하는 AP의 형상이 구형에 가까울수록 추진제 혼화 후 시간에 따라 낮은 점도를 유지하는 것을 확인하였다. AP 냉각결정화 공정 실험은 테일러 유동을 이용한 반응기로 진행하였고 냉각속도, 반응시간 및 gap 크기에 따라 조건 실험을 통하여 구형에 가까운 AP 결정을 얻었다. 구형도는 1.0(비표면적 측정 기준)에 가까울수록 좋고 구형도는 입도분석기를 통하여 입자분포별 비표면적을 측정하고 각 입자크기에 따른 기준 비표면적과 비교해 구형도를 환산하였다. The Viscosity and mechanical properties of the composite propellant with ammonium perchlorate(AP) are affected by the shape of the AP. It was confirmed that near-spherical shape of the AP used in the HTPB-based propellant, the lower the viscosity over time after propellant formulation. The AP cooling crystallization process was conducted in a reactor using a Taylor flow, and the AP crystals near the sphere were obtained through the conditional experiments according to the cooling rate, reaction time and gap size. It was best when the sphericity was estimated to be 1.0. The specific surgace area of each particle distribution was measured using a particle size analyzer, and the sphericity was converted to the specific surface area according to the particle size.