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나혜섭,한양규,김필수,송석호,오차환,곽장만,주원제 漢陽大學校 自然科學硏究所 1999 自然科學論文集 Vol.18 No.-
측쇄형으로 서로 대칭인 두 광기능성 그룹들(4-cyanoazobenzene groups)을 표함하는 유기고분자(side-chain polymalonic esters with two symmetrical photoresponsive groups, PCN)에 이광파혼합을 이용하여 소거가 가능한 회절격자를 형성하였다. 이는 두 조사광들의 편광합이 λ/2sinθ의 주기로 공간적으로 변하고, 이에 의해 측쇄형 광기능성 분자군은 편광 방향에 수직한 면으로 정렬을 하여 매질의 흡수율 변조를 야기한다. 흡수율의 변조는 klamers-kronig 관계식에 의해 굴절율의 변조로 나타나며[1], 이로부터 편광 홀로그램이 기록된다. We investigate erasable polarization holographic gratings recorded with two-wave mixing in photoanisotropic organic materials which were side-chain polymalonic esters with two symmetrical photoresponsive groups(4-cyanoazobenzene groups). The superposition of polarizations of two writing beams varies spatially with a period of λ/2sinΘand accordingly side-chain photoresponse groups reorient perpendicular to the superposed polarization and thus the modulation of absorption of the polymers is induced. The phase polarization hologram is recorded with the modulation of refractive index which is related with absorption by klamer-kronig relation.
캡슐화된 잠열 미립자 슬러리를 열 매체로 하는 축열식 냉방시스템
최준규,이재구,양현수,주태운,김필수 한국공업화학회 2003 응용화학 Vol.7 No.1
Microcapsules containing tetradecane as the phase change material (PCM) and ashell of meolamine-formalin resin were prepared by in situ polymerization. Tooptimize the encapsulation process, experiments were performed under various reaction conditions. Microcapsules with a high uniformity could be prepared, and the ratio of breakage of the microcapsules was less than 6% over 10,000 cycles using by a circulation pump. The cooling system, which has adopted MPCM slurry as a media for transporting cold thermal energy, is designed to investigate the performance of newly developed coolant. The discharging times of cold energy in circulating 20 wt% MPCM slurry are lasted to 260 minutes as long as the sensible cooling system. According, it was demonstrated that the microcapsules prepared in the current research are suitable for potential application as hat transporting media.