• The Journal of the Korea Contents Association
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• v.18 no.7
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• pp.245-252
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• 2018

The rose bengal reagent, based on the phase transfer catalysis technique, is a calcium-targeting reagent that forms an insoluble salt that does not dissolve in a neutral or basic solution. It is expected to be effective in developing a latent fingerprint in a wet sample. However, many previous studies did not observe the fluorescence of the developed fingerprints, nor were the proposed methods of producing the reagents the optimal develop conditions. The aim of this study was to investigate the optimum reagent composition of rose bengal by varying the concentration of rose bengal dye and phase transfer catalyst based on maximum emission fluorescence of rose bengal. As a result, it was confirmed that rose bengal and surfactant concentration were the most effective when 0.01M: 0.008M, respectively.

• Proceedings of the Membrane Society of Korea Conference
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• 1994.04a
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• pp.49-50
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• 1994

상호 불용성인 용매에 녹아있는 반응물들 간의 반응은 각 물질이 상 경계면을 뛰어 넘기가 어려워 매우 느린 속도로 진행된다. 그러나 상호 불용성인 비균질계에 상이동 촉매라는 제 3의 물질을 첨가하면 반응은 급격히 향상된다[1, 2]. 따라서 본 연구에서는 클로로벤젠 상의 브로모 옥탄이 TBABr(Tetra Butyl Ammonium Bromide) 이온 촉매의 존재 하에 수용액상의 요오드 이온과 반응하는 평판형 막반응기를 대상으로 수치모사를 수행하여 그 결과를 Stanley와 Quinn[3]의 실험값 및 수치모사치와 비교하였으며, 막 반응기의 모듈 선택, 설계 및 운영, scale-up시 고려되어야 할 사항들을 탐색연구하여 보았다.

• Elastomers and Composites
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• v.45 no.1
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• pp.17-24
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• 2010

Herein, the effect of the dispersion uniformity of the multi-wall carbon nanotube (MWCNT) on the thermal and electrical conductivity of polystyrene (PS)/MWCNT composite was investigated. The PS/MWCNT composites were prepared by solution mixing from dispersions of various MWCNTs in PS/tetrahydrofuran (THF) solution. Three types of MWCNTs were used; pristine MWCNT, hydroxyl functionalized MWCNT, which was functionalized with $KMnO_4$ in the presence of a phase transfer catalyst at room temperature, and pristine MWCNT with BYK-9077 as a dispersant. It was found that the stable dispersion state of MWCNT in PS/THF solutions significantly improved the thermal and electrical conductivity of the ultimate composites. It is noted that the thermal and electrical conductivity of PS/3 wt% pristine MWCNT composite with BYK-9077 were about 9.4 and 30~50% higher than those of PS/3 wt% pristine MWCNT composite, respectively.