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Kim, Hyun Ju,Um, In Chul 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.2
Electro-spun silk fibroin (SF) has been studied for biomedical applications because of its good biocompatibility, cyto-compatibility, and simple fabrication method. SF is obtained by a degumming process and the degumming method can affect the degree of molecular degradation of SF during the degumming process. In the present study, the effect of the degumming method on the rheology and electro-spinning performance of a silk solution was examined. In addition, the relationship between the rheology and electrospinnability was investigated. Regardless of the degumming method, all silk formic acid solutions exhibited almost Newtonian fluid behavior. The order of the viscosity of the silk solution was as follows: HTHP method > acid method > soap/soda method. An analysis of the correlation between the viscosity and electrospun morphology showed that the viscosity played a key role in determining the electro-spun morphology, and the critical viscosity for good fiber formation without beads in electro-spinning exists between 0.13 and $0.20Pa{\cdot}s$. The viscosity also determines the maximum electro-spinning rate of the SF formic acid solution. The morphology and diameter of the electro-spun fiber were almost unaffected by the electro-spinning rate of the SF solution.
김현주,엄인철 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.2
Electro-spun silk fibroin (SF) has been studied for biomedical applications because of its good biocompatibility,cyto-compatibility, and simple fabrication method. SF is obtained by a degumming processand the degumming method can affect the degree of molecular degradation of SF during the degummingprocess. In the present study, the effect of the degumming method on the rheology and electro-spinningperformance of a silk solution was examined. In addition, the relationship between the rheology and electrospinnabilitywas investigated. Regardless of the degumming method, all silk formic acid solutions exhibitedalmost Newtonian fluid behavior. The order of the viscosity of the silk solution was as follows: HTHPmethod > acid method > soap/soda method. An analysis of the correlation between the viscosity and electrospunmorphology showed that the viscosity played a key role in determining the electro-spun morphology,and the critical viscosity for good fiber formation without beads in electro-spinning exists between 0.13 and0.20 Pa·s. The viscosity also determines the maximum electro-spinning rate of the SF formic acid solution. The morphology and diameter of the electro-spun fiber were almost unaffected by the electro-spinning rateof the SF solution.
이은주,곽대현,김득중 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.3
Synthetic biodegradable polymer matrix composites including bioactive ceramic phases are being increasingly considered for use as tissue engineering scaffolds due to their improved physical, biological and mechanical properties. Cellulose acetate composite fibers were prepared by electro-spinning of cellulose acetate doped with from 2.5 to 40 vol.% hydroxyapatite nano powder. The structure of the electro-spun web varied depending on the solvent types. The cross-linked morphology between fibers was obtained by the addition of benzyl alcohol. In this study, the effect of the spinning dope composition and the filler concentration on the morphology of electro spun cellulose acetate fibers was evaluated. The mechanical properties of the electro-spun single fiber were measured using a Thermo Mechanical Analyzer (TMA). The tensile strength of electro-spun fibers depended on the filler content.
고재상,기창석,엄인철 한국섬유공학회 2018 Fibers and polymers Vol.19 No.3
Electro-spun silk web has attracted attention for biomedical applications because of its excellent bio-compatibility and facile fabrication method. Because biomedical applications require various performances of silk web, many studies have been conducted on the effect of the variables associated with their preparation on the structure and properties of silk web. In the present study, the effect of residual sericin content on the morphology, structural characteristics, and properties of electrospun regenerated silk web was examined. The regenerated silk without sericin (i.e., silk with 100 wt% fibroin) did not show good electro-spinnability. However, the electro-spinnability improved remarkably above a sericin content of 0.6 wt%. The crystallinity index of the electro-spun silk increased at 0.6 wt% sericin content and decreased above 8.2 wt% sericin. The mechanical properties of the electro-spun silk webs showed a similar trend as their crystallinity indices. The breaking strength and elongation improved significantly at 0.6 wt% sericin content and both parameters gradually decreased above this value. The thermal stability of the silk web decreased slightly upon increasing the sericin content.
Electro-Spinning에 의한 셀룰로오스 Web의 제초 및 산화셀룰로오스 분해 거동
강영식,김학용,류영준,이덕래 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.1
Cellulose web was fabricated by electro-spinning process under high voltage. Also, oxidized cellulose web was made by oxidation process which involved the reaction of cellulose web with a mixture of nitrogen dioxide and perfluorocarbon. It was developed to prevent the adhesion of human body tissue because of its bioabsorbable properties. Cellulose web was electrospun from 8 wt% cellulose solution in N-methylmorpholine N-oxide (NMMO). It had a diameter in the range from 0.5 to 157m. It was confirmed by IR (C=O, 1730~1750 $cm^{-1}$ /) that some pars of OH groups of cellulose web was changed to COOH groups. The carboxyl content of oxidized cellulose web increased with reaction time and temperature. In-vitro degradation of oxidized cellulose web was tested as a function of immersion time in a buffer solution at pH 7.4 and 37$^{\circ}C$. It absorbed the surrounding buffer solution and swelled. As immersion time increased, it became a gel. Most of its fibrous structure was lost within immersion time of 4 days. It degraded completely within a week.
Effect of molecular weight on electro-spinning performance of regenerated silk
Park, Bo Kyung,Um, In Chul ELSEVIER 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.106 No.-
<P><B>Abstract</B></P> <P>Owing to the excellent biocompatibility of silk fibroins (SFs) and ease of fabrication of nano-fibrous webs by the electro-spinning technique, electro-spun SF webs have attracted the attention of researchers for various biomedical applications, including their use as tissue engineering scaffolds and membranes for guided bone regeneration. In this work, the effect of the molecular weight (MW) and concentration of SFs on the structure and properties of the electro-spun SF webs was examined. The fiber morphology and porosity of these SF webs were strongly affected by the viscosity of the SF dope solution. It was found that the electro-spinning rate of the SF solution could be increased significantly (7.5 fold) by controlling the MW and concentration of the SF. Interestingly, as the SF MW and concentration (i.e., s olution viscosity) increased, the extent of β-sheet crystallization of the SF decreased, leading to a decrease in the overall crystallinity. The strength and elongation of the electro-spun SF web decreased with an increase in the web porosity (i.e., increasing SF concentration) and a decrease in the MW of the SF.</P>
노즐의 이동 및 각도 변화가 전기방사시스템의 전기장에 미치는 영향 해석.
이정호(Jung Ho Lee),박찬희(Chan Hee Park),양수진(Su Jin Yange),문호준(Ho Jun Moon),김경화(Kyung Hwa Kim),황보상(Bo Sang Hwang),김철생(Cheol Sang Kim) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1
Robot-assisted the multi nozzle device and Nozzle less (free liquid surface) technology development are the innovative ways for the produce nano fiber. However those studies which use angled multi nozzle and electric field were not performed at all. Therefore, we developed new electro-spinning system that can move the position of the angled nozzle. And we compared simulation result and experimental results regarding the electric field between the nozzle and collector tips. Finally, interference of the electric field is the largest when the nozzle angles is 90°. And even if the robot is move between the nozzle and the collector the direction of the electric field was maintain steady state. Also, the results of experiment which measuring the change of the electric field in electro-spinning system by applying the noise filter were obtained similar results.
PVDF를 포함한 고분자 블렌드의 전기방사와 유변학적 특성 분석
윤병욱,송예은,김보경,주양율,김융암,이두진 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.6
The electro-spinnability of poly(vinylidne fluoride) (PVDF) solutions vary basedon the characteristics of the blended additives and solutions. In this study, we preparedPVDF-based polymer blends comprising of poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP), thermoplastic polyurethane (TPU), and carbon black nanoparticles. Theelectro-spinnability of PVDF nanofibers at different polymer concentrations was analyzedusing the storage to loss moduli ratio known as the Cole-Cole plot. In addition, the vanGurp–Palmen plot, comprising of the complex modulus and phase angle, was used todescribe the polymer network behavior in the PVDF solutions.