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복합재료 섬유흡착제를 이용한 해수로부터 우라늄 분리에 관한 연구(2)(흡-탈착 특성)
황택성,박정기,홍성권,신현택,노영창,Hwang, Taek-Seong,Park, Jeong-Gi,Hong, Seong-Gwon,Sin, Hyeon-Taek,No, Yeong-Chang 한국재료학회 1996 한국재료학회지 Vol.6 No.8
아미드옥심기와 복합재료 섬유흡착제를 제조하였고 해수로부터 우라늄이온의 분리 특성을 조사하였다. 흡착량은 흡착시간이 증가함에 따라 증가하였고 An:TEGMA:DVB의 몰비가 1:0.1:0.003인 수지가 pH 8 부근에서 최대 흡착능을 나타내었다. 또한 흡착량은 CFA에 첨가한 흡착제의 양이 증가함에 따라 증가하였으며 1시간 까지 선형적으로 증가하였고, $25^{\circ}C$에서 최대흡착량을 나타내었다. 한편 Ca, Mg 이온은 흡-탈착 cycle이 반복될수록 증가하였으며 그양은 각각 0.3, 0.9mmole/g-Ads로 우라늄 이온의 그것보다 매우 낮았다. 흡착된 우라늄 이온의 탈착은 흡착제의 종류에 관계없이 약 30분 이내에 거의 100% 탈착되었다. The composite fiber adsorbents containing amidoxime group were prepared and separation properties of uranium ion from seawater were investigated. The amount of uranium adsorption was increased with an increase in adsorption time. When the mole ratio of monomer and comonomer, such as acrylonitrile (AN), tetraethyleneglycol dimethacrylate(TEGMA), and divinylbenzene (DVB), were 1 :0. 1 :0.003, this resin showed the maximum adsorption ability for uranium at a level of pH 8. The amount of uranium adsorption was also increased linearly to one hour with an increase in the content of adsorbent which was added in the composite fiber adsorbents(CFA). The maximum adsorption for uranium of CF A showed at $25^{\circ}C$. Hence, the adsorption ability of CF A for calcium and magnecium ions were increased gradually by the recycling of adsorption and disorption, the adsorption content of their on were 0.3, 0.9mmole/g-adsorbents, respectly. It also showed that the adsorption contents of Ca and \1g ions were much lower than them of uranium. The desorption of uranium on the CF A was carried out , bout 100% within 30min, and the desorption rate of various CF A were equalled.
토코페롤을 함유한 Poly(ε-caprolactone) 마이크로캡슐의 방출거동
박수진 ( Park Su Jin ),김기석 ( Kim Gi Seog ),홍성권 ( Hong Seong Gwon ) 한국공업화학회 2003 공업화학 Vol.14 No.8
본 연구에서는 대기중에서 토코페롤의 보존 안정성을 향상시키기 위하여 벽재 물질로서 poly(ε-caprolactone) (PCL)을 이용하여 캡슐화 하였다. 토코페롤을 함유하는 PCL 마이크로캡슐은 액중건조법에 의하여 제조하였고 마이크로캡슐의 특성을 알아보기 위하여, 교반속도, 유화제의 농도, 그리고 토코페롤의 농도를 변화시켜 제조하였다. PCL 마이크로캡슐에 대한 심물질의 함입은 FT-IR에 의하여 확인하였고, 마이크로캡슐의 크기와 형태는 image analyzer와 SEM을 이용하여 관찰하였다. 또한, 마이크로캡슐에서 토코페롤의 방출특성은 UV/vis spectra에 의하여 측정하였다. 실험결과, 마이크로캡슐의 입자 크기는 교반속도와 유화제의 함량이 증가함에 따라 작아지는 것을 알 수 있었다. 또한 마이크로캡슐의 용융 엔탈피(ΔHm)는 심물질의 감소와 함께 증가하였고, 방출 속도는 감소하는 것을 확인할 수 있었다. 이는 심물질의 함량 감소와 함께 심물질의 표면에 대한 PCL의 흡착량의 증가에 의한 것으로 판단된다. In this work, tocopherol was encapsulated for improved retention stability with biodegradable poly(ε caprolactone)(PCL) as wall materials. PCL microcapsules containing tocopherol were prepared by oil-in water (O/W) emulsion solvent evaporation method. To cetemine the characteristics, the microcapsules were prepared in different stirring rates, concentrations of the surfactant, and weight ratios of tocopherol. The PCL microcapsules were confirmed by FT-IR and the effects of manufacturing factors on the diameter and the form of microcapsules were observed by image analyzer and scanning electron microscope. And the release behavior of microcapsule was characterized by UV/vis. spectorphotometer. As a result, the average particle size of microcapsules decreased with the increase of the stirring rate and surfacant ratio. The melting enthalpy(△Hm) of microcapsules was increased and the release rate decreased with the decrease of core concentration. These results are probably due to the increased adsorption quantity of the PCI, on core surfaces
에너지/환경 : 습식방법에 의한 팽창흑연의 제조 및 특성에 관한 연구
박수진 ( Park Su Jin ),김기석 ( Kim Gi Seog ),홍성권 ( Hong Seong Gwon ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.6
In this work, the characteristics of expanded graphite (EG) are investigated for the possibility of useful application as oil-adsorbent of EG. The graphite intercalated compounds (GICs) are prepared by the wet process that leads to an intercalation of intercalant into natural graphites. The graphite intercalate is subjected to the heat treatment in furnace between 600℃ and 900℃ under oxidizing atmosphere for about 1 min. The expansion volume, volatile content, and interlayer distance of EG on different heating temperatures are measured by mass cylinder and X-ray diffraction (XRD). N-dodecane is used for oil adsorption, and morphology of EG before and after oil adsorption is observed by SEM. As a result, the expansion volume and volatile content of EG are increased with increasing the treatment temperature. The oil adsorption capacity is found to be 16-35g of n-dodecane per the 1g EG studied. It is then concluded that the wet process of EG is a useful technique for a new adsorbent of oil.
분체공학,유동층,고분자,재료(무기, 유기) : 생분해성 폴리락타이드/폴리에틸렌글리콜 공중합체 마이크캡슐의 제조와 방출거동에 대한 연구
박수진 ( Park Su Jin ),김승학 ( Kim Seung Hag ),홍성권 ( Hong Seong Gwon ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.4
In this work, biodegradable poly(L-lactide) (PLA)/poly(ethylene glycol) (PEG) microcapsules were prepared by emulsion solvent evaporation method. The effect of PEG segments on the degradation, size distribution, and release behavior of the microcapsules was studied. According to the experimental results, PLAPEG copolymers were more hydrophilic and exhibited lower glass transition temperatures compared to PLA homopolymer. The surface of PLAPEG microcapsules was not as smooth as that of PLA microcapsules. The mean diameters of the PLA and PLA/PEG microcapsules were 40 and 57 pm, respectively. The spherical forms were observed by image analyzer and scanning electron microscope (SEM). Drug release from microcapsules was determined by UV/Vis spectra. It was found that the drug release rates of the microcapsules were significantly increased with adding of PEG, which could be attributed to the increase in their hydrophilicity and swelling characteristics.
공유화제가 첨가된 미니에멀젼 중합에 의한 폴리(비닐 아세테이트) 라텍스의 제조 및 특성
박수진 ( Park Su Jin ),김기석 ( Kim Gi Seog ),홍성권 ( Hong Seong Gwon ) 한국공업화학회 2004 공업화학 Vol.15 No.3
Poly(vinyl acetate) (PVAc)는 dodecyl methacrylate (DMA), cetyl alcohol (CA), 그리고 hexadecane (HD)과 같은 각기 다른 세가지 공유화제의 첨가에 의한 미니에멀젼 중합법에 의하여 중합하였다. PVAc 미니에멀젼 중합의 반응 시간에 따른 전환율은 중량측정법에 의하여 측정하였고, PVAc 라텍스의 입자 특성은 입도 분석기에 의하여 정의하였다. 실험 결과, PVAc의 중합은 1 h 이내의 빠른 시간 내에 이루어졌고, 균일화에 의한 단량체 입자의 증가에 의하여 일반적인 에멀젼 중합보다 빠른 전환율을 나타내는 것을 확인할 수 있었다. 단량체 입자의 크기는 공유화제와 개시제의 종류 및 균일화 시간과 같은 제조 조건에 의하여 조절할 수 있었고, 제조된 고분자 라텍스의 입자크기는 약 40~500 ㎚로 나타났다. 또한 미니에멀젼에 중합에 의한 고분자 라텍스는 일반적인 에멀젼 중합과 비교하여 우수한 저장 안정성을 나타내었고, 이러한 특성은 공유화제의 첨가에 의해 형성된 삼투압 효과에 의해 입자간의 Oswald ripening 효과 및 유착을 방지하기 때문으로 판단된다. Poly(vinyl acetate) (PVAc) was polymerized by miniemulsion method in the presence of three different cosurfactants, i.e. dodecyl methacrylate (DMA), cetyl alcohol (CA), and hexadecane (HD). Changes in the conversion with time was examined with gravimetry analyzer, while the particle features of polymer latexes were determined with particle size analyzer. The conversion over 90% was achieved within 1 h and the conversion rate in the miniemulsion polymerization was higher than that in the conventional emulsion polymerization. This is attributed to the increased number of droplet during homogenization. The diameters of polymer latexes were adjusted between 40∼500 nm by controlling cosurfactant, initiator, and homogenization time. Shelf stability of miniemulsion exhibited was found to be superior compared with that of conventional polymerization. These results probably stem from the prevention of Ostwaid ripening and the coalescence among the particles by the osmotic effect formed with the addition of cosurfactant.