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윤연흠,윤영남,윤순도,이종운 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.1
In this study, starch/polyvinyl alcohol (PVA)/titanium oxide (TiO2) nanocomposite films were synthesized using a casting method. The characteristics of the starch/PVA nanocomposite films were evaluated by a scanning electron microscope (SEM), and X-ray diffraction (XRD). The physical properties such as tensile strength (TS), elongation at fracture (%E), degree of swelling (DS), solubility (S), and water vapor absorption of the prepared nanocomposite films were studied. The results of the investigation of the physical properties for the films indicated that compared with films without added TiO2 nanoparticles, the mechanical properties and water resistance were enhanced up to 1.14-1.52 times by the addition of TiO2 nanoparticles. In order to extend the application area of the nanocomposite films containing TiO2 nanoparticles, the photocatalytic activity of films with/without TiO2 nanoparticles was also examined by monitoring the degree of decomposition of BPA and 2,4-D. All the tested nanocomposite films revealed photocatalytic activity under UV and visible light irradiation although the rate of decomposition was slow compared to the use of UV light irradiation.
윤연흠,김은식,심왕근,윤순도 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
The main objective of this study is to prepare the bionanocomposite films using mungbean starch (MBS), PVA, ZnS, and plasticizers, and to evaluate the physical properties, thermal stability, and photocatalytic activity. The bionanocomposite films were cross-linked by heat-curing process. The ZnS and bionanocomposite films were characterized by FT-IR, XRD, and SEM. The results indicated that the mechanical properties and water resistance enhanced up to 1.2–1.5 times by the addition of nano-ZnS particles, and the thermal stability was improved by the addition of nano-ZnS particles. The photocatalytic activity of the bionanocomposite films added nano-ZnS particles was examined using bisphenol A (BPA) and methyl orange (MO). In addition, the photodegradation efficiency of BPA and MO was evaluated using the pseudo-first order kinetic model (PFOK).
윤연흠,박돈희,김용웅,조완현,박천영,윤정한 대한자원환경지질학회 2000 자원환경지질 Vol.33 No.5
This study was focused on the investigation for the heavy metal contamination of soils derived from Yoecheon Industrial Complex in Chonnam Province. Total 201 soil samples including farmland, paddy, forest and playground soils were collected, extracted by 0.1N HCl and analyzed for Cd, Cu, Cr, Fe, Mn and Zn using AAS. Most pH values in soils were weak acidic ranges of 4-6, while some of them were over 8.0. Concentrations of Cd, Cu, Fe and Zn in the soils tend to be relatively high around the Au-Ag mine area, railroad stations and oil station, however, those of Cr, Mn and Pb show high at the northside of Pohang Steel Co (POSCO). Cadmium-Zn couples, and Cd-Zn and Zn-Cr couples have relatively good correlations in the farmland soils and paddy soils, respectively. Concentrations of Cd, Fe and Zn with depth tend to be higher in the top soils than in the bottom soils, but those of Cu and Pb do not show regular variations with depth.
키토산 기반 분자 각인 고분자 필름의 슐린닥 흡착 및 방출 특성
윤연흠 ( Yeon-hum Yoon ),윤순도 ( Soon-do Yoon ),나재운 ( Jae Woon Nah ),심왕근 ( Wang Geun Shim ) 한국공업화학회 2019 공업화학 Vol.30 No.2
분자인식기술은 특정 분자를 고분자 매트릭스에 각인시켜 특정 분자의 선택성을 높이는 기술로 관심을 받아왔다. 이 연구에서는 Sulindac (SLD)을 각인시킨 키토산 기반 약물 전달용 필름의 흡착 및 방출 특성을 가소제, 온도, pH를 변화시켜 실험하고 그 결과를 관련 모델식으로 해석하였다. SLD 각인 고분자 필름의 약물 흡착은 Freundlich와 Sips식이 Langmuir식보다 더 잘 설명되었고 binding site 에너지 분포 함수는 SLD와 고분자 필름 간의 흡착 특성관계를 이해하는데 유용하였다. 그리고 SLD 각인 고분자 필름의 약물 방출은 Fickian 확산 거동을 보인 반면, 인공피부조건에서는 non-Fickian 확산 거동을 따랐다. Molecular recognition technology has attracted considerable attention for improving the selectivity of a specific molecule by imprinting it on a polymer matrix. In this study, adsorption and release characteristics of chitosan based drug delivery films imprinted with sulindac (SLD) were investigated in terms of the plasticizer, temperature and pH and the results were also interpreted by the related mathematical models. The adsorption characteristics of target molecules on SLD-imprinted polymer films were better explained by the Freundlich and Sips equation than that of the Langmuir equation. The binding site energy distribution function was also useful for understanding the adsorption relationship between target molecules and polymer films. The drug release of SLD-imprinted polymer films followed the Fickian diffusion mechanism, whereas the drug release using artificial skin followed the non-Fickian diffusion behavior.
Starch와 PVA를 이용한 생분해성 필름의 제조와 물리적 특성
윤연흠 ( Yeon Hum Yun ),윤순도 ( Soon Do Yoon ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.1
We report on the preparation and physical properties of films using corn starch and poly(vinyl alcohol) (PVA). Starch/PVA biodegradable films were synthesized with a mixing process and casting method. Glycerol (GL), sorbitol (SO), malic acid (MA), tartaric acid (TA) and citric acid (CA) were used as additives. Gelatin (GE) was used as filler for increasing of physical properties of starch/PVA biodegradable films. The additives and the influence of filler in films on the physical properties of the films were investigated. The mechanical properties, tensile strength (TS), elongation al break (% E), degree of swelling (DS), and solubility (S) of starch/PVA blend film were examined adding GL, SO, MA, TA and CA as additives and GE as filler. The results of the measurements indicated that the GE-added films were better than the other films.
Preparation of glass ceramics from sludge bottom ash and waste glass
윤순도,윤연흠 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.4
Glass ceramics are prepared by milling and firing at various temperatures using sludge bottom ash from incinerators and waste glass as starting materials. The FE-SEM observations of glass ceramics indicated that with an increase of the firing temperature from 850 oC to 1050 oC, acicular type crystals were grown to about 11 μm in length. A specimen fired at 1050 oC showed the optimum formation of acicular type crystals as well as their best mechanical properties. Crystallinity,morphological properties and chemical compositions were examined using X-ray diffraction (XRD), field emission–scanning electron microscopy (FE-SEM) and an energy dispersive X-ray spectrometer (EDS). Various properties, such as density,compressive strength, bending strength and chemical durability were also examined.
황규석,윤연흠,강보안,양순호,오정선,김병훈,김상복 한국결정성장학회 2003 韓國結晶成長學會誌 Vol.13 No.4
광페롤용 안정화 지르코니아 소결체의 특성을 평가하기 위하여, A, B와 C사의 원료를 이용하여 1350, 1400 및 $1450^{\circ}C$로 소결하여 시편을 제작하였다. 각각의 열처리 온도에 따른 결정화도, 미세구조 및 기계적 특성을 조사하였다. X-선 회절 분석법과 전계방사 주사형 전자현미경을 이용하여 소결된 시편의 결정화도와 미세구조를 분석하였으며, 만능재료 시험기와 비이커스 경도계를 이용하여 꺽임 강도와 비이커스 경도를 측정하였다 실용적인 측면에서 볼 때, 비교적 저온인 $1350^{\circ}C$로 소결한 시편 B의 경우가 tetragonality도 높고 좋은 기계적인 강도를 나타냈다. In order to evaluate the properties of the sintered zirconia for optical ferrule, specimens were prepared at 1350, 1400 and $1450^{\circ}C$ using starting materials supplied by A, B and C providers. Crystallinity, microstructure and mechanical strength were tested as a function of sintering temperature. Crystallinity of the sintered specimens was determined by X-ray diffraction analysis. A field emission-scanning electron microscope was used for studying the microstructure after sintering. Bending strength and Vickers' hardness were also examined by universial tester and Vickers' hardness tester, respectively. The specimen B sintered at $1350^{\circ}C$ was favorable because of its high tetragonality and good mechanical strength for practical usage.