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Molecular imprinting 이용한 Toluic acid isomer 분리
윤순도,이지훈,박혜령,조성효 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
Molecular imprinting polymer(MIPs) 기술은 특정분자(target molecule)에 선택성을 가지는 고분자를 만든 후 고분자에 흡착되게 하는 기술로서 최근까지 많은 연구가 진행되고 있다. 응용분야로는 광학 이성체 분리용 크로마토그래피 충전제, 생물화학 반응을 하는 인공효소, 고효율 생물센서, 분리막 등 다양하다. 이는 고분자 합성이 용이하고 특정 분자를 인식하는 3차원 공간을 만드는데 걸리는 시간이 짧고 경제적인 장점이 있다. 본 연구에서는 Molecular imprinting 기술을 이용하여 Toluic acid Isomer를 분리할 수 있는 고분자가를 합성하였다. Styrene과 4-vinylpyridine을 사용하여 template를 선택성 있게 결합시킬 수 있는 고분자를 합성하고 Toluic acid Isomer, salicylic acid, benzoic acid를 흡착시켰다. 그 결과각각의 Toluic acidMIPs(Molecular imprinting polymers)에 중합시 사용된template가 보다 흡착이 잘 되는 결과를 얻음으로써 Toluic acid 이성질체에 선택성 있는 고분자가 합성 되었음을 확인하였다. 또한. Template를 넣지 않고 중합한 Control polymer와 Toluic acid -MIPs에 대한 Toluic acid Isomer의 흡착량도 비교하였다. 또한, Styrene과 4-vinylpyridine에 divinylbenzene을 첨가한 polymer를 합성하고, 공용매를각기 다른 비로 사용하여 Solvent 조성에 따른 Template의 제거량을 조사하였다. 중합시 Styrene 비에 따른 선택성, Template 제거 방법에 따른 선택성을 비교한 결과Styrene 비에 따른 선택성은 큰 차이가 없었다. Template 제거 방법에 따른 isomer 흡착량의 차이는 비교적 크게 나타냈다. 흡착은 각각의 MIPs에 대해 평형이 이루어 질 때까지 행하였다.
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.
Chemical durability of wollastonite glass-ceramics derived from waste glass and sludge bottom ash
윤순도,이종운,윤연흠,양형식 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.1
Wollastonite glass-ceramics was prepared by using the milling and sintering process with a mixture of two different powders. As a solution to environmental and waste recycling problems, powder mixtures consisting of dry sludge bottom ash and waste glass powder were used to make Wollastonite glass-ceramics. The chemical durability, crystallinity, morphological properties and chemical compositions of the specimens before and after acid immersion were observed by field emission-scanning electron microscopy (FE-SEM) and an energy dispersive X-ray spectrometer (EDS). Various mechanical properties, such as density, compressive strength, bending strength and Vickers hardness were also investigated. Various heat treatment temperatures [850, 950 and 1050 oC] were used to obtain glass-ceramics before and after the acid immersion of the optimum chemical durability and to find adequate mechanical properties for practical usage. As the heat-treatment temperature was increased from 850 oC to 1050 oC, the mechanical properties improved, especially the glass-ceramics in a dense acicular type of crystals of the Wollastonite phase at 1050 oC, in particular, and all specimens before and after acid immersion, in general. Wollastonite glass-ceramics was prepared by using the milling and sintering process with a mixture of two different powders. As a solution to environmental and waste recycling problems, powder mixtures consisting of dry sludge bottom ash and waste glass powder were used to make Wollastonite glass-ceramics. The chemical durability, crystallinity, morphological properties and chemical compositions of the specimens before and after acid immersion were observed by field emission-scanning electron microscopy (FE-SEM) and an energy dispersive X-ray spectrometer (EDS). Various mechanical properties, such as density, compressive strength, bending strength and Vickers hardness were also investigated. Various heat treatment temperatures [850, 950 and 1050 oC] were used to obtain glass-ceramics before and after the acid immersion of the optimum chemical durability and to find adequate mechanical properties for practical usage. As the heat-treatment temperature was increased from 850 oC to 1050 oC, the mechanical properties improved, especially the glass-ceramics in a dense acicular type of crystals of the Wollastonite phase at 1050 oC, in particular, and all specimens before and after acid immersion, in general.
윤순도,최영훈,윤현기,김한성,이창문 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
In this work, chitosan-based functional biomaterial for diltiazem (DTZ) recognition are prepared by using chitosan, PVA, glutaraldehyde (GA), and plasticizers. The functional biomaterial was synthesized by using UV curing process. The surface morphology of the prepared biomaterials was characterized by scanning electron microscope (SEM). In addition, tensile strength (TS), elongation at break (%E), swelling behavior (SB) and solubility (S) for chitosan-based functional biomaterial were investigated. To evaluate the binding characteristics of biomaterial with/wthout DTZ, the adsorption properties was investigated by equilibrium binding experiment. The results indicate that the prepared functional biomaterial have one site of DTZ as the target molecule. As the results of drug release of DTZ with the pH and temperature, the release in high pH and temperature was better than in low pH and temperature. In addition, the release of DTZ was carried out by using artificial skin.
Chemical durability and photocatalyst activity of acid-treated ceramic TiO2 nanocomposites
윤순도,김은식,윤연흠 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Ceramic TiO2 nanocomposites were manufactured using the mechanical grinding and annealing procedure with the powder mixtures of fly ash, waste glass powder and nano-TiO2. The chemical durability of the heat-treated specimens was examined at 850 °C with nano-TiO2 contents to evaluate the morphological properties with/without the acid treatment, and the photocatalytic activity for bisphenol A, acetaldehyde, 2,4-dichlorophenoxyacetic acid, methylene blue, and methyl orange was investigated. The compressive strength, bending strength, and Vickers hardness of the specimens were also analyzed. Ceramics nanocomposite with 15.0 wt% TiO2 was found to be the optimum photocatalyst mechanism in all cases with/without the acid treatment.
윤순도,Tae-Hyun Choi,Yoon-Seok Jang,변헌수 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.3
Pressure-composition isotherm is obtained for the carbon dioxide+2,2,3,3,3-pentafluoropropyl methacrylate (PFPMA) using static apparatus with a variable volume view cell at temperature range from 40 oC to 120 oC and pressure up to 130 bar. This system exhibits type-I phase behavior with a continuous mixture-critical curve. The experimental result for carbon dioxide+PFPMA mixture was modeled using the Peng-Robinson (P-R) and multi-fluid nonrandom lattice fluid (MF-NLF) equation of state. Experimental cloud-point data of pressure up 470 bar and temperature to 182 oC were reported for the binary mixture of poly(2,2,3,3,3-pentafluoropropyl methacrylate) [Poly(PFPMA)] in supercritical carbon dioxide and dimethyl ether (DME). The Poly(PFPMA)+carbon dioxide and Poly(PFPMA)+DME systems showed LCST behavior.