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벤질트리알킬암모늄계 양이온성 계면활성제가 리포좀 제조와 특성에 미치는 영향
정연석,정노희 한국유화학회 2016 한국응용과학기술학회지 Vol.33 No.3
본 연구에서는 알킬체인의 길이가 서로 다른 benzyltrialkylammonium chloride계 화합물을 합성하여 리포좀 제조에 응용하였다. 제조된 리포좀의 평균 입도분포, 제타전위, 방출거동 및 항균성을 조사하였으며, 사슬 길이에 따른 특성을 비교하였다.리포좀의 평균 입도는 120~140 nm의 크기분포를 가졌으며 소수성 사슬의 길이가 증가할수록 큰 입 자크기를 가졌다. 리포좀 용액의 제타전위는 양이온성 계면활성제인 benzyltrialkylammonium chloride를 첨가함에 따라 +80~90 mV의 값을 가지며 향상된 분산 안정성을 보였다. 방출거동에서는 사슬 길이에 따라 방출 속도를 조절할 수 있었으며 긴 사슬의 계면활성제를 첨가한 리포좀은 증가된 서방형 방출특 성을 보였다. 또한, 리포좀의 포집효율은 25.9~27.5% 이었다. In this study, benzyltrialkylammonium chlorides with different alkyl chain length were synthesized and applied to liposome. Prepared cationic surfactant embedded liposomes were measured particle size, zetapotential, release property and antibacterial activity. The average particle size of liposomes was 120~140 nm. As alkyl chain length was increased, the liposome size was increased. Zetapotential for the solution of liposomes added cationic surfactants were in the range of +80~90 mV. In release test, collagen release rate could be controlled by alkyl chain length. liposome embedded long alkyl chain surfactant had enhanced sustained release property. Entrapment efficiency of hydrophilic collagen were 25.9~27.5%.
정연석,유진오,염경호 한국고분자학회 2015 Macromolecular Research Vol.23 No.11
Microencapsulation technique of phase change materials (PCMs) has been attracted as one of effective methods to store and transfer the energy. Although the size control of microcapsules as PCMs is very important, it still remains a key issue to resolve. In this study, monodispersed paraffin microcapsules with silica shell were fabricated by membrane emulsification and thermal properties were investigated for the application of energy saving wallpaper. Particle size analyzer, scanning electron microscopy, Fourier transform infrared spectroscopy, and differential scanning calorimetry were used for microcapsule characterization. As results, uniform size of paraffin microcapsules (mean diameter 5 μm) was obtained at high N2 pressure and low surfactant concentration using membrane emulsification and silica shell was successfully synthesized by polycondensation. Also, their latent heat properties were significantly improved compared to pure paraffin. Finally, membrane emulsification is very effective technique to fabricate paraffin microcapsules with feasible size control. Since paraffin microcapsules have high latent heat with thermal stability, those can be used for the application of functional wallpaper as well as building structure materials for saving energy.
정연석,김이두,박광도 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.5
Lots of methodologies for digital data exchange have been studied for decades in order to share various types of information generated from the whole life-cycle of construction industry. As one of the results, a standard model of steel structure, CIS/2, has been developed from the Eureka CIMsteel Project, and currently, it is adopted by AISC as the standard for electronic exchange of structural steel project information. Thus, CAD & CAE vendors have been trying to implement application modules for supporting the standard and apply it for practical works. But the efforts are still at the early stage.This study has developed an information management system for sharing and managing structural analysis and design information of steel structures by using CIS/2. The system was developed on the basis of the commonly used CAD system like AutoCAD and consists of data set for CIS/2 data and Input/Output API of STEP physical files, and several application modules like visualization of shape, management of related information and automatic design of bolted connections. This study utilized ObjectARX application environments that allow developers to handle geometric shape and engineering information in the system. Since this study adopted solid modeling technique to manipulate shape of steel structures, engineering and shape information can be easily integrated on the system with reduced development time and little cost.