• Title/Summary/Keyword: 미립자

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Preparation and Nonlinear Optical Properties of CuCl-doped Nonlinear Optical Glasses : III. Bimodal Distribution of CuCl Nanocrystals and Temperature Dependent Optical Absorption Spectra (CuCl 미립자가 분산된 비선형 광학유리의 제조와 비선형 광특성: III. CuCl 반도체 미립자의 Bimodal 분포 특성과 온도에 따른 광흡수도)

  • 윤영권;한원택
    • Journal of the Korean Ceramic Society
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    • v.34 no.4
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    • pp.436-442
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    • 1997

  • The bimodal distribution of CuCl nano-crystals precipitated in alumino-borosilicate glass matrix (30SiO2-45B2O3-7.5Al2O3-7.5Na2O-7.5CaO-2.5GeO2(mole %)) was investigated by TEM and the temperature dependent optical spectroscopy. Two types of CuCl particles with different size were observed by TEM and it was confirmed by the splitting of Z3 absorption peak at low temperature and the occurrence of deflection point in the optical spectra with temperature.

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Controlled Morphology of Particles Prepared by Electrospray Technique (전기분무법에 의해 제조되는 미립자의 형상 제어)

  • Nguyen, The Dung;Choi, Jin-hoon;Yoon, Ji-Ae;Kim, Kyo-Seon
    • Journal of Industrial Technology
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    • v.35
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    • pp.67-71
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    • 2015

  • Various structures of particles were prepared by electrospray technique. In this research, solid particles were formed by electrospraying a solution of ethanol containing polyvinyl and tetraethyl orthosilicate. During the electrospray process, the ethanol solvent was evaporated, resulting in the solidification of precursors, forming solid particles. Evaporation of ethanol solvent also enhanced the mass transport which facilitated the development of porous and hollow structures.

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Phase Separation and Precipitation Characteristics in ZnS doped Borosilicate Glasses (ZnS 미립자 분산 붕규산엽계 유리에서의 분상 및 미립자 석출 특성)

  • 이승환;류봉기
    • Journal of the Korean Ceramic Society
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    • v.35 no.12
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    • pp.1337-1342
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    • 1998

  • To investigate an effect of phase separation on precipitation characteristics of ZnS microcrystals in ma-trix glass ZnS doped borosilicate glasses for nonlinear optical applications were prepared by melting and pre-cipitation process. ZnS dopant contributed to phase separation promotion which increased the phase separa-tion of the matrix glass within immiscibility region. It was also found that ZnS as phase separation promoter showed a similar contribution for some selected glass compositions in miscibility region. The precipitation of ZnS microcrystals occurred in thephase separable glass compoitions. The radius of ZnS microcrystals in-creased with increasing the heat treatment temperature and Na2O contents of matrix glass composition. The ZnS particle sizes estimated by effective mass approximation ranged from about 30 to 80${\AA}$ It was suf-ficiently small to show quantum confinement effect.

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