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Chitosan - PVP 복합막을 이용한 Multiple Emulsion 의 제조에 관한 연구
정경택,이훈,설용건 ( Kyeong Taek Jung,Hoon Lee,Yong Gun Shul ) 한국공업화학회 1997 응용화학 Vol.1 No.1
A multiple emulsion system(W/O/W) in which effective oil and water phase can exist simultaneously was prepared by using chitosan-PVP. To increase stability of capsule, W/O/W solution was treated with NaOH solution in the final step. Multiple emulsion of chitosan-PVP of 2-3mm in diameter, whose outside was made of chitosan as wall materials, was obtained. The maximum hardness was shown at the chitosan(70%)-PVP(30%) composite film. Anti-bacterial property of this film was test by E. coli. These results suggest that the more stable DDS system can be developed by the preparation of multiple emulsion of chitosan-PVP system.
나노크기의 티타늄실리카라이트 - 1 ( TS - 1 ) 제올라이트의 합성
이전희,정경택,설용건 ( Jeon Hee Lee,Kyeong Taek Jung,Yong Gun Shul ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.6
Nano-sized titanium silicalite-1(TS-1) zeolite was synthesized by using hydrothermal synthesis at the atmospheric pressure and the temperatures lower than 100℃. This synthetic method makes it possible to control the particle size of TS-1. As the reaction temperature decreased, the induction period increased and the rate of crystallization and the final crystal size decreased. During the crystallization, average crystal size of TS-1 zeolite was linearly increased with reaction time. The apparent activation energy of crystallization was 86.7 kJ/㏖. When the reaction time was 70 hours at 80℃, average particle size of TS-1 with 50 ㎚ in diameter was obtained, which have TS-1 zeolite crystallinity up to 750℃. Nano-sized TS-1 zeolite may he applicable to the new field of zeolite.
Sodium Acetate Trihydrate를 이용한 구형의 PCM입자의 제조
김종국(Jong Kuk Kim),정경택(Kyeong Taek Jung),설용건(Yong Gun Shul),김동형(Dong Hyung Kim),이태규(Tae Kyu Lee) 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.17 No.2
잠열 저장물질로서 비조화 축열재인 sodium acetate trihydrate를 사용하여 구형의 PCM 입자를 제조하였다. 비조화 축열재의 단점인 상분리 현상 및 과냉각 현상을 방지하기 위하여 점증제로서 gelatin, 조핵제로서 sodium pyrophosphate decahydrate 를 사용하였다. 혼합조성의 용융 PCM을 이용하여 연속적으로 지름이 3~3.5mm인 구형 PCM 입자가 제조되었다. 용융 PCM 방출속도가 1.3~1.8ml/min 인 범위 내에서는 PCM 입자크기가 방출속도에 영향을 받지 않았다. 제조된 PCM 입자의 물성을 측정하기 위하여 DSC, SEM과 XRD를 이용하였다. Spherical shape of phase change material (PCM) has been prepared by using sodium acetate trihydrate as a latent heat storage medium Gelatin was used as an effective thickener to prevent undesirable phase separation. Sodium pyrophosphate decahydrate was used as nucleator to decrease the degree of supercooling in the thickened phase change material. Spherical PCM particles of 3 - 3.5 mm in diameter continuously manufactured with molten PCM with those conditions. The particle size of PCM was not affected by the effluent velocity of molten PCM in range of 1.3 - 1.8 ml/min. DSC, SEM and XRD were also used to characterize the properties of PCM particles