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졸-겔 법에 의해 제조된 광촉매 화합물의 항균 및 탈취 특성
공병기,최창용,나상권,나재운 한국공업화학회 2004 응용화학 Vol.8 No.1
Photocatalysis, which can be applied to get energy economically, to synthesis useful materials, and to remove environmentally harmful materials by transforming solar energy to chemical energy, has many advantages. In this study, photocatalystic compound was prepared by sol-gel technique for antimicrobial activity and deodorization. It showed that in case of deodorization, formaldehyde and ammonia were degraded by 98.3 and 97.1%, respectively. In addition, this compound gives the highest efficiency for disinfection of E. coli and S. aureus.
공병기,나상권,최창용,나재운 한국공업화학회 2004 응용화학 Vol.8 No.2
Generally, photocatalysis can be applied to get energy economically, synthesize the useful materials, and remove environmentally harmful materials by transforming solar energy to chemical energy. Recently, the availability of photocatalysis has largely interested in the environment of Ubiquitous. Therefore, the study for photocatalysis has progressed by many investigators in domestic. In this study, titania sol was prepared by the sol-gel proess and characteristics of the products was investigated by TGA, XRD and SEM.
공병기,나상권,최창용,나재운 한국공업화학회 2004 응용화학 Vol.8 No.2
Stable titania sols for preparation of TiO₂ thin films were synthesized from titanium tetra isopropoxide. TiO₂ thin films were prepared with by dipping the sols on the glass substrates, and the properties of the films were investigated with XRD, SEM and EDS.
폴리에틸렌테레프탈레이트의 용융거동에 미치는 기핵제의 영향 : ethylene terephtalate
나상권,공병기,최창용,나재운 한국공업화학회 2004 응용화학 Vol.8 No.1
Effect of nucleating agent on the melting behavior of PET was studied by DSC. The low crystallization temperature(T_(ch)) shifted to the low temperature and the nonisothermal crystallization peak temperatures(T_(cc)) shifted to the higher temperature as the concentration of the nucleating agent increased.
Polygoum Tinctoria와 합성 인디고 염료의 물리화학적 특성 비교
최창용,장미경,공병기,최혜영,나상권,이동병,양숙향,나재운 한국공업화학회 2002 응용화학 Vol.6 No.2
The natural dye substances appear to have a lot of benefits that enable the dyed materials to exhibit their natural colors. It may have a bit of a harmful influence on the human body itself, in comparison with the synthetic substances. It also causes hardly any environmental pollution because of the natural chemicals and costs much less to disposal. In this study was investigated physicochemical characterization of polygoum tinctoria dye substance and synthetic indigo. Calcium hydroxide was added into polygoum tinctoria leaves to precipitate dye substances and it was freezing dried into powder form. Characterizations of dye substances were investigated by UV/VIS spectrophotometer, TLC, DSC, TGA, HPLC, and MALDI-TOF Mass. Resultantly, polygoum tinctoria was confirmed that is consisted of two ingredients from these results.
공병기,정창남,나재운 한국공업화학회 2002 응용화학 Vol.6 No.2
Chitin is one of the most abundant biopolymers. There are three polymorphic crystal structures of chitin, that is, a-, β-, γ-structure. In this study, a,β,γ-chitin were isolated from natural resources by treatment with dilute NaOH solution for deprotenization, followed by treatment with dilute HCl solution for demineralization, and characterised by solid state CP/MAS ^13C NMR and XRD. The thermal degradation properties of chitin has been studied by TGA in the range of 20~700℃. From the isothermal TGA experiments, the initial activation energy and the activation energy at different stage is obtained. The differences in the thermal degradation kinetics of chitins were due to their different intermolecular hydrogen bonding systems.
Na Sang-Kuwon,Kong Byeong-Gi,Choi Changyong,Jang Mi-Kyeong,Nah Jae-Woon,Kim Jung-Gyu,Jo Byung-Wook The Polymer Society of Korea 2005 Macromolecular Research Vol.13 No.2
Melt blending of Bisphenol A polycarbonate (PC) and poly(trimethylene terephthalate) (PTT) was carried out over the entire composition range. The mixing time was varied up to 90 min. The resulting samples were analyzed by FT-IR, DSC, XRD, DMTA, $^{1}H NMR$, and SEM. The process of transesterification between the two polymers and their resulting compatibilization were observed. The behaviors of the PTT-rich and PC-rich blends were different and an equilibrium was found to exist. Peculiar behavior, which was different from that of the PTT-rich and PC-rich blends, was exhibited by the 50/50 (PTT/PC) blend.