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다공성 폴리(ε-카프로락톤)/실리카 복합체의 제조 및 특성평가
손시원(Siwon Son),최지은(Ji-Eun Choi),조훈(Hun Cho),강대준(DaeJun Kang),이득용(Deuk Yong Lee),김진태(Jin-Tae Kim),장주웅(Ju-Woong Jang) 한국고분자학회 2015 폴리머 Vol.39 No.2
졸-젤법을 이용한 전기방사법과 캐스팅법으로 폴리(ε-카프로락톤)(PCL) 나노섬유와 PCL/실리카 막을 각각 제조하였다. 용매에 N,N-dimethylformamide(DMF)를 혼합한 경우 부드럽고 연속적인 PCL 나노섬유가 제조되었다. PCL 기지상에 tetraethyl orthosilicate(TEOS) 농도가 0에서 40 vol%로 증가함에 따라 PCL/silica의 강도는 12에서 8MPa로 감소하였지만, 7주까지 phosphate buffered saline solution(PBS) 침지에 따른 강도값의 변화는 없었다. 실리카 첨가에 따른 인장강도의 감소는 기공도의 증가에 기인하였다. PCL/실리카 막의 결정구조는 사방정계로 실리카 농도가 0에서 40 vol%로 증가함에 따라 crystallite 크기는 57에서 18 nm로 감소하였다. 세포독성 실험결과, PCL/실리카는 시편의 수축 및 변형이 없고, 검체 주위에서 변색이나 L-929 세포의 이상이 관찰되지 않는 무독성이었다. Poly(ε-caprolactone) (PCL) nanofibers and PCL/silica membranes were synthesized by sol-gel derived electrospinning and casting, respectively. Smooth PCL nanofibers were obtained from the precursor containing N,Ndimethylformamide (DMF). PCL/silica membranes were prepared by varying the tetraethyl orthosilicate (TEOS) contents from 0 to 40 vol% to investigate the effect of silica addition on mechanical properties and cytotoxicity of the membranes. Although the strength of the membranes decreased from 12 to 8 MPa with increasing the silica content, the strength remained almost constant 7 weeks after dipping in phosphate buffered saline solution (PBS). The strength reduction was attributed to the presence of a patterned surface pores and micro-pores present in the walls between pores. The crystal structure of the membranes was orthorhombic and the crystallite size decreased from 57 to 18 nm with increasing the silica content. From the agar overlay test, the PCL/silica membranes exhibited neither deformation and discoloration nor lysis of L-929 fibroblast cells.
李時元,孫晋彦,鈴木基之 東亞大學校 大學院 1989 大學院論文集 Vol.14 No.-
Activated carbon fiber(ACF) is an attractive adsorbent since it has a high specific external surface area like powdered activated carbon but is easier to handle since it is easily separated from fluid. Also since fiber radius is as small as about ten microns, intra-fiber diffusion of adsorbate cannot be the rate determining step even in liquid phase absorption and then it might provide a broad field of application in the water treatment area as well as in gas adsorption. When ACF is applied to water treatment, high external surface area provides a good environment for attached growth of bacteria and then an cooperative effect of adsorption and bacterial reaction may be emphasized. The adsorption equilibrium constant were determined from the first moments of the pulses and the second moments shelved that the axial dispersion was a controlling mechanism in broadening of the peaks. It is suggested that for biological activated carbon fiber there is a large contribution of bacterial activity to the adsorption equilibrium constant. Rate determining step in an ACF bed was the longitudinal dispersion of adsorbate in the column. Axial dispersion coefficient,?? was determined to be in proportional to flow rate and Pe=??independent of existence of bacteria, where ?? is the diameter of ACF.
纖維狀活性炭(ACF)을 이용한 液相吸差칼럼의 混合擴散에 관한 硏究
孫晋彦,鈴木基之,李時元 釜山敎育大學 1988 부산교육대학 논문집 Vol.24 No.1
As for ACF the adsorption rate is at high speed, because its fiber radius is small and its specific external surface area is large. But the adsorption tower design is necessary enough to study for its great price. This thesis is the experimental study of mixing diffusion in determining factor during the liquid phase adsorption on ACF packing layer.
손진언,이시원 한국고무학회 1989 엘라스토머 및 콤포지트 Vol.24 No.2
Liquid phase adsorption of organic compounds solution on the activated carbon fiber was measured by chromatographic method in a packed column. Adsorption equilibrium constant Ka of dextrose solution was found to be 72.5㎠/g on ACF without bacteria growth, while in the bacterial ACF packed column Ka was 87.9㎠/g. It is suggested that for biological ACF there is a large contribution of bacterial activity to the adsorption equilibrium constant. Axial dispersion coefficient Ez was determined to be in proportional to flow rate and Pe=dpu/Ez independent of existence of bacteria.
김예나,손시원,전철병,김진태,이득용,최효정,김태형,차은종 대한의용생체공학회 2016 Biomedical Engineering Letters (BMEL) Vol.6 No.4
Purpose A 3wt% poly(L-lactic acid) (PLLA) with differentconcentrations of polyethylene glycol (PEG, 0~9wt%) wasblended and lyophilized to evaluate the morphology and thebiocompatibility of the PLLA/PEG scaffolds. The purpose ofthis study is to investigate the biocompatibility of the PLLA/PEG blends. Morphology, degradation rate, cytotoxicity, skinsensitization, acute systemic toxicity, and intradermal reactivityare examined. Methods The morphology of the scaffolds was examined byusing scanning electron microscopy. The degradation of thescaffolds in phosphate buffer solution was measured for upto 9 weeks by measuring the weight loss. The extract testmethod was conducted on the scaffolds to evaluate the potentialof cytotoxicity on the base of the International Organizationfor Standardization (ISO 10993-5). Skin sensitization, acutesystemic toxicity, and intradermal reactivity were conductedaccording to ISO 10993-10(2010), ISO 10993-11(2006), ISO10993-10(2010), respectively. Results The lamellar morphology of PLLA scaffold waschanged to the ladder-like structure with adding PEG. Thepore size of the PLLA/PEG blends decreased from 24±6 μmto 13±2 μm with increasing the PEG content from 0wt% to9wt%. As a result of the measurement, degradation rate rosewith increasing the PEG content in PLLA and biodegradablePLLA/PEG blend scaffolds exhibited excellent biocompatibilitydue to the absence of cytotoxicity, skin sensitizing potency,acute systemic toxicity, and intradermal reactivity. Conclusions This outcome implied that the biodegradablePLLA/PEG scaffolds were clinically safe and effective.
Photocatalytic activity of TiO2 nanomaterials
송요승,손시원,이득용,이명현,김배연 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.11
To investigate the effect of calcination temperature on crystal structure, phase, and photocatalytic activity of methylene blue(MB), TiO2 nanofibers were prepared through sol-gel derived electrospinning, calcination from 500 oC to 650 oC, andsubsequent mechanical grinding. XRD results indicated that TiO2 nanofibers calcined at 500 oC is composed of anatase TiO2 only. However, mixed crystals of anatase and rutile were observed for TiO2 calcined above 550 oC. Higher MB degradationwas observed for the TiO2 nanofibers calcined at 550 oC most likely due to the mixed crystals and large surface area. Enhanced photocatalytic activity was achieved for TiO2 and Nb-TiO2 nanotubes due to the synergic combinations of mixed crystals and larger specific surface area.
Viscoelasticity of Hyaluronic Acid Dermal Fillers Prepared by Crosslinked HA Microspheres
Cheolbyong Chun(전철병),Yena Kim(김예나),Siwon Son(손시원),Deuk Yong Lee(이득용),Jin-Tae Kim(김진태),Mi-Kyung Kwon(권미경),Young-Zu Kim(김영주),Seok-Soon Kim(김석순) 한국고분자학회 2016 폴리머 Vol.40 No.4
디비닐 설폰 가교제로 가교한 히알루론산(HA) 구슬과 비가교된 HA의 부피비가 65/35~95/5로 다른 피부용 HA 필러를 제조하여 가교된 HA 구슬이 필러의 탄성계수와 입자감에 대한 효과를 조사하였다. 구슬 내 2~4±0.5 μm 내부기공을 가진 HA 구슬의 평균 입도는 60~100±4 μm이었다. HA 필러의 가교된 젤 입자 크기는 300±30 μm이었다. 가교된 HA 미세구슬의 부피비가 65에서 95%로 증가함에 따라 필러의 탄성계수는 211에서 700 Pa로 증가하였다. 29~30 게이지 주사바늘을 통과할 수 있는 175~420 Pa 탄성계수를 가진 필러의 가교된 구슬의 부피함량은 65~85%이었다. 실험결과, 모든 필러들은 가교된 HA 구슬의 부피비가 증가할수록 젤 입자 밀도 증가로 인하여 입자감도 증가하였다. 본 연구에서 injectability와 입자감이 우수한 피부용 필러를 성공적으로 제조하였다. Hyaluronic acid (HA) dermal fillers having different ratios (65/35~95/5) of crosslinked HA microspheres (CHMs) to pure HAs (PHs) are synthesized to investigate the effect of CHMs on the variation of elastic modulus (G") and particle texturing feel (PTF). The diameter of CHMs is in the range of 60 to 100±4 μm with a 3-D porous structure channeled with 2 to 4±0.5 μm pores. The fillers consist of gel particles of 300±30 μm size. G" increased from 211 to 700 Pa with raising the volume fraction of CHM from 65% to 95%. The fillers having the ratios of 65% to 85% exhibit the G" values in the range of 175 Pa to 430 Pa, which can be extruded through the 29~30-gage needle. Experimental results reveal that PTF rises with increasing the volume fraction of CHM due to high density of gel particles. Excellent gel injectability and PTF are successfully achieved.