• 제목/요약/키워드: I-gel

검색결과 1,185건 처리시간 0.029초

수화겔의 상전이에 관한 연구: (I)폴리(N-이소프로필아크릴아미드)겔의 부피상전이 (A study on phase transition of Hydrogel: (I)Volume Phase Transition of N-Isopropylacrylamide gel)

  • 박상보;민성기
    • 한국인쇄학회지
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    • 제21권1호
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    • pp.11-20
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    • 2003
  • Equilibrium swelling curves of N-isopropyl acrylamide(NIPA) gel and its ionized copolymer gels were obtained as a function of temperature. Discontinuous volume changes of the gels were observed. Phase transition temperature was increased with the ionized counter parts of the gels. Equilibrium swelling of ionized copolymer gel cylinder was found to depend strongly on their diameters. Crosslinking density of NIPA gel was adjusted by increasing N,N'-methylenebisacrylamide(BIS). Phase transition temperature was increased with the crosslinking density.

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Doping Effects of Water-Soluble Poly(3-thiopheneacetic acid) (P3TAA) and its Gel

  • Kim, Byoung-Suhk;Li Chen;Gong, Jian-Ping;Yoshihito Osada
    • Macromolecular Research
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    • 제8권3호
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    • pp.116-119
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    • 2000
  • The doping behaviors of water-soluble poly(3-thiopheneacetic acid) (P3TAA) and ie gel using I$_2$and concentrated HCIO$_4$aqueous solutions were investigated by UV-Visible absorption spectrometer. Electrical conductivity of tile doped polyhiophene gel was also studied. I$_2$-doping of water-soluble P3TAA gave rise to a new broad polaron peak at around 749 nm, which corresponds to localization of electron. It was found that doping ability of P3TAA gel was strikingly dependent on the concentration of HCIQ solution.

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Aging 효과가 Sol-gel 공정 기반 CuO 박막 트랜지스터의 전기적 특성에 미치는 영향 (Aging Effects on Electrical Characteristics of Sol-gel Processed CuO Thin Film Transistors)

  • 장재원
    • 한국전기전자재료학회논문지
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    • 제29권9호
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    • pp.527-531
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    • 2016
  • In this study, p-type thin film transistors consisting of CuO channels were fabricated by sol-gel process, with copper (II) acetate monohydrate precursors. At $500^{\circ}C$, the deposited films were fully converted into monoclinic phase CuO. The fabricated CuO thin film transistors deliver field effect mobility in saturation regime of $0.015cm^2/Vs$, and $I_{on}/I_{off}$ of ${\sim}10^3$. The degradation of the performance of the fabricated CuO thin film transistor caused by the exposure to air has been studied.

해양동물 눈알고둥으로부터 새로운 렉틴 성분의 분리 및 정제 (Purification and Characterization of A New Lectin from Marine Animal Lunella coronata coreensis)

  • 소명숙;서영아;전경희;정시련
    • 약학회지
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    • 제36권3호
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    • pp.241-249
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    • 1992
  • The whole body extract of Lunella coronata coreensis agglutinated nonspecifically human and other animal erythrocytes. A new lectin was purified by the following procedures: 0.15 M NaCl extraction, salt fractionation, gel filtration, anionic and cationic ion exchange column chromatographies. Through these purification procedures, specific activity of LCC-I was increased from 276 to 9714.3 units/mg, And on polyacrylamide gel electrophoresis, LCC-I exhibited one major band. A molecular weight of LCC-I was assumed to be 20,000 by sodium dodesyl sulfate polyacrylamide gel electrophoresis. The purified lectin was relatively stable at various pH and heat. Among the tested sugars, lactose and lactulose inhibited lectin activity at a concentration of 6.25 mM, respectively.

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닭의 추백리병에 관한 연구 I. 추백리 진단에 있어서 혈청응집과 Agar-gel 침강반응과의 비교 시험 (Studies on Diagnosis for Pullorum Disease Comparative Experiments for the Diagnosis of Pullorum Disease by Tube Agglutination and Agar-gel Precipitin Tests with Chicken Sera)

  • 최재윤;이시영;이창구
    • 대한수의학회지
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    • 제10권2호
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    • pp.1-5
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    • 1970
  • In these studies the efficracy of plate, tube agglutination and agar-gel precipitin test were compared for the detection of pullorum infected chickens. From all the chickens showing positive reaction in agar-gel precipitin test, Salmonella pullorum organisms were isolated.

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DIS 공정에 의한 Polyethylene Glycol 함침 알로에 베라 겔의 제조 및 특성화 (Preparation and Characterization of PEG-impregnated Aloe Gel through DIS Processing of Aloe vera Leaf Slice)

  • 권혜미;허원;이신영
    • KSBB Journal
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    • 제28권6호
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    • pp.356-365
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    • 2013
  • The novel Aloe gels were prepared with dewatering and impregnation by soaking (DIS) processing of Aloe vera leaf slice at four different temperatures (25, 35, 45 and $55^{\circ}C$), using dehydration solution of 40% (w/v) polyethylene glycol (PEG4000). The PEG-impregnation to Aloe vera leaf slice during DIS was observed depending on immersion temperature, and the PEG-impregnated Aloe vera gel (PEG-i-AVG) obtained was characterized using $^1H$ NMR, FT-IR, GPC, XRD and TGA. The PEG-i-AVG had the higher levels of Aloe bioactives (glucomannan and O-acetyl contents) and better quality indices by $^1H$ NMR and FT-IR spectroscopy than those of native Aloe gel. Also, the obtained Aloe gel maintained the bimodal patterns in higher molecular weight region by GPC indicating no degradation of polysaccharide from native Aloe gel. The result observed by SEM confirmed a surface modification by forming the porous structure, and TGA result exhibited better thermal stability than that of native Aloe gel. XRD result revealed that the crystalline structure in Aloe gel was led by incorporation of PEG. Significant decrease of %insolubility and high enhancement of water solubility index were observed, respectively, and highly ordered conformation such as a helix structure was also indicated by Congo red reaction. We concluded that the modification effect for enhancing function of native Aloe gel was successfully obtained by DIS process using PEG as a dehydrating agent. These results suggested that this DIS process had a high potential for developing a new minimally processed product from Aloe vera leaf.

리튬 유황 전지용 PVdF 겔 고분자 전해질의 가소제에 따른 전기화학적 특성 평가 (Electrochemical Properties of PVdF Gel Polymer Electrolyte with Plasticizer for Lithium/sulfur Battery)

  • 류호석;김종선;김동주;김동연;김익표;안효준;김기원;안주현;이건환
    • 전기화학회지
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    • 제10권3호
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    • pp.213-218
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    • 2007
  • 리튬/유황 전지에 적합한 전해질을 조사하기 위하여, 여러 종류의 글라임(glyme)계 가소제를 넣은 폴리비닐리덴플로라이드(poly(vinylidene fluoride):PVdF) 겔 고분자 전해질을 제조하여 전기화학적 특성을 실험하였다. 가소제는 에틸렌옥사이드(ethylene oxide; EO) 구조를 가지는 glyme계 유기용매 중에서, EO의 체인 길이가 다른 트리글라임(triglyme), 테트라글라임(tetraglyme), 폴리글라임(polyglyme (Mn=250, 500))의 네 종류를 사용하였다. 가소제 내의 EO의 체인 길이가 길어질수록 PVdF 겔 고분자 전해질의 이온전도도는 감소하였다. PVdF 겔 고분자 전해질의 가소제로 triglyme을 사용한 경우의 이온전도도가 $5.38{\times}10^{-4}\;S/cm$로 가장 높았으며, polyglyme(Mn=500)를 사용한 경우에는 $2.80{\times}10^{-4}\;S/cm$으로 가장 낮았다. 그러나 계면저항은 tetraglyme을 사용한 경우에 가장 낮게 나타났으며, 이 전해질을 리튬/유황 전지에 적용하였을 때 1232 mAh/g-S(이론용량의 70%)의 높은 초기 방전 용량을 나타내었다.

Enhanced Proteomic Analysis of Streptomyces peucetius Cytosolic Protein Using Optimized Protein Solubilization Protocol

  • Lee, Kwang-Won;Song, Eun-Jung;Kim, June-Hyung;Lee, Hei-Chan;Liou, Kwang-Kyoung;Sohng, Jae-Kyung;Kim, Byung-Gee
    • Journal of Microbiology and Biotechnology
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    • 제17권1호
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    • pp.89-95
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    • 2007
  • Improvements in the dissolution of proteins in two-dimensional gel electrophoresis have greatly advanced the ability to analyze the proteomes of microorganisms under a wide variety of physiological conditions. This study examined the effect of various combinations of chaotropic agents, a reducing agent, and a detergent on the dissolution of the Streptomyces peucetius cytosolic proteins. The use of urea alone in a rehydration buffer as a chaotropic agent gave the proteome a higher solubility than any of the urea and thiourea combinations, and produced the highest resolution and clearest background in two-dimensional gel electrophoresis. Two % CHAPS, as a detergent in a rehydration buffer, improved the protein solubility. After examining the effect of several concentrations of reducing agent, 50 mM DTT in a rehydration buffer was found to be an optimal condition for the proteome analysis of Streptomyces. Using this optimized buffer condition, more than 2,000 distinct and differentially expressed soluble proteins could be resolved using two-dimensional gel electrophoresis with a pI ranging from 4-7. Under this optimized condition, 15 novel small proteins with low-level expression, which could not be analyzed under the non-optimized conditions, were identified. Overall, the optimized condition helped produce a better reference gel for Streptomyces peucetius.

Sol-gel법으로 제조한 강유전성 Bi3.25La0.75Ti3O12박막의 급속열처리에 따른 전기적 특성에 관한 연구 (A Study on Electrical Properties of Sol-gel Derived Bi3.25La0.75Ti3O12 Thin Films by Rapid Thermal Annealing)

  • 이인재;김병호
    • 한국세라믹학회지
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    • 제40권12호
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    • pp.1189-1196
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    • 2003
  • Sol-gel법으로 강유전성 B $i_{3.25}$L $a_{0.75}$ $Ti_3$ $O_{12}$ (BLT) stock solution을 합성하고 Pt/Ti $O_2$/ $SiO_2$/Si 기판위에 스핀코팅법으로 BLT 박막을 증착하였다. 본 실험에서는 Bi(TMHD)$_3$, La(III)2-Methoxyethoxide, Ti(IV)i-propoxide를 출발물질로 사용하였으며 2-Methoxyethanol을 용매로 사용하였다. 급속열처리(RTA)가 BLT 박막의 결정성장을 촉진시키기 위해 사용되었고, RTA를 실시한 시편과 RTA를 실시하지 않은 시편의 전기적 특성을 비교하였다. RTA를 실시한 후 72$0^{\circ}C$에서 로 열처리 한 BLT 박막의 경우 5V 인가 전압 하에서 2Pr 값은 RTA를 실시하지 않은 경우보다 27% 증가한 20.46$\mu$C/$ extrm{cm}^2$이었다.