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전구체의 특성 및 AlF<sub>3</sub> 융제가 청색 발광의 BAM:Eu 형광체의 특성에 미치는 영향
조중상,이상호,강윤찬,Cho, Jung-Sang,Lee, Sang-Ho,Kang, Yun-Chan 한국재료학회 2008 한국재료학회지 Vol.18 No.3
Blue-emitting BAM:Eu phosphor powders were formed by post-treatment of precursor powders with hollow or dense morphologies. The morphologies of the precursor powders obtained by spray pyrolysis were controlled by changing the preparation conditions and by changing the type of spray solution. The effects of the morphologies of the precursor powders on the characteristics of the BAM : Eu phosphor powders reacted with $AlF_3$ flux were investigated. Precursor powders with a spherical shape and a hollow morphology produced BAM : Eu phosphor powders with a plate-like morphology, a fine size and a narrow size distribution. On the other hand, precursor powders with a spherical shape and dense morphology produced BAM : Eu phosphor powders with a plate-like morphology and a large size. $AlF_3$ flux improved the photoluminescence intensities of the BAM : Eu phosphor powders. The photoluminescence intensity of the fine-sized BAM : Eu phosphor powders with a plate-like morphology was 90% of the commercial product under vacuum ultraviolet conditions.
고온 화염분무열분해법에 의해 합성된 장파장 자외선 하에서의 녹색 발광 실리케이트 형광체
조중상,구혜영,이상호,강윤찬,Cho, Jung-Sang,Koo, Hye-Young,Lee, Sang-Ho,Kang, Yun-Chan 한국재료학회 2008 한국재료학회지 Vol.18 No.2
Green-emitting $Ba_{1.468}Sr_{0.5}SiO_4\;:\;Eu_{0.012},\;Y_{0.02}$ phosphor powders under long-wavelength ultraviolet light were prepared via high-temperature flame spray pyrolysis from spray solutions with and without $NH_4Cl$ flux. The effects of the temperature of the diffusion flame and the $NH_4Cl$ flux on the morphologies, crystal structures and photoluminescence intensities of the $Ba_{1.468}Sr_{0.5}SiO_4\;:\;Eu_{0.012},\;Y_{0.02}$ phosphor powders were investigated. The phosphor powders obtained from the spray solution with the $NH_4Cl$ flux had higher photoluminescence intensities compared to phosphor powders obtained from the spray solution without the flux. The photoluminescence intensity of the phosphor powders obtained from the spray solution without the flux decreased as the flow rate of the fuel gas increased. On the other hand, the photoluminescence intensity of the phosphor powders obtained from the spray solution with the flux increased as the flow rate of the fuel gas increased. The difference of in the phase purity and morphology of the powders affected the photoluminescence intensities of the phosphor powders.
2LC-4 중공 나노 복합구조체 합성 및 이차전지 음극활물질 적용
조중상 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
최근 에너지 저장, 가스 센서, 촉매, 바이오, 제약 등의 여러 분야에서 다양한 형태 및 조성을 갖는 나노구조체가 연구되고 있다. 이 중, 최근 차세대 에너지 저장장치 개발에 대한 요구와 관심이 증대됨에 따라 저가의 매장량이 풍부한 소듐 사용이 전지 분야의 새로운 화두로 제시되고 있지만 기존 리튬 전지에 비해 큰 이온직경 및 분자량을 갖는 소듐은 전지로 적용 시 여러 문제점을 야기한다. 소듐 이온의 느린 확산속도로 인한 저 출력 현상 및 큰 직경을 갖는 소듐 이온의 반복적인 삽입과 탈리로 인한 전극 내 생성된 응력은 음극활물질의 붕괴 및 극판과의 박리를 야기, 결국 전지 수명을 단축시킨다. 따라서, 충방전 시 전극 물질의 부피팽창을 효과적으로 완화, 또는 억제시키기 위해 음극활물질의 형태적 관점에서 다양한 연구가 진행 중이다. 본연구에서는 다양한 합성기전의 분무열분해 공정 및 전기방사 공정으로의 적용을 통해 중공 나노구조체의 형태 및 특성을 제어했으며 소듐 이차전지의 음극 활물질로 적용, 전기화학적 특성을 분석했다.
Characterization of particle aggregation in a colloidal suspension of magnetite particles
조중상,구상균 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
We investigate relation between hydrodynamic transport properties of a colloidal suspension ofmagnetite particles and aggregation of the particles. The magnetite particles are of 0.3 mm in diameterand are dispersed in Newtonian ethylene glycol. The volume fraction of the particles in the suspensionranges from 0.003 to 0.04. Shear viscosity and average sedimentation velocity of the suspension aremeasured as a function of the particle volume fraction. To predict the aggregation of the suspendedparticles particle-scale analysis of sedimentation and viscosity behavior of the suspension is correlatedwith scaling theories for fractal aggregates. The sedimentation velocity as a function of particleconcentration gives the fractal dimension of 1.91 for the magnetite aggregates in the suspension. Sheardependence of the aggregate size which is expressed by a power law is determined from intrinsicviscosity for the aggregates and yield stress of the suspension, respectively. It is found that the sheardependence from intrinsic viscosity is in good agreement with that from yield stress