• 제목/요약/키워드: surface hydrophobicity

검색결과 419건 처리시간 0.032초

글루텐의 표면소수성에 미치는 전해질, pH 및 다시마(Sacchrina japonicas) 알긴산나트륨의 분자량의 영향 (Effect of pH, Electrolytes, and Molecular Weights of Sodium Alginate (Prepared from Sacchrina japonicas) on Gluten Surface Hydrophobicity)

  • 임영선;유병진
    • 한국수산과학회지
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    • 제54권4호
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    • pp.543-551
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    • 2021
  • Changes in gluten surface hydrophobicity, which play an important role in the functional characteristics of protein, were measured according to various protein concentrations, pH levels, electrolytes concentrations, and alginate molecular weights using 8-anilino-1-naphthalene sulfonic acid (ANS) as a fluorescent probe. Gluten surface hydrophobicity decreased as gluten concentration increased, reaching a maximum pH of 7.0. The effects of alginate molecular weights and alginate concentration on the surface hydrophobicity, emulsifying activity index (EAI), and emulsion stability index (ESI) of gluten-sodium alginate dispersion (GAD) were measured. Gluten surface hydrophobicity rapidly increased the asl NaCl concentration of gluten solution up to 300 mM and showed no significant increase above 300 mM. However, gluten surface hydrophobicity notably decreased until the concentration of CaCl2 and MgCl2 reached 30 mM, indicating no significant variations above 30 mM. GAD surface hydrophobicity increased as the concentration and molecular weight of sodium alginate increased, however, gluten concentration increased as the GAD surface hydrophobicity decreased. The EAI and ESI of GAD increased as both molecular weight and concentration of sodium alginate increased.

실리콘 고무의 소수성에 미치는 첨가된 실리콘 오일의 영향 (Effects of Added Silicone Oils on the Surface Hydrophobicity of Silicone Rubber)

  • 한동희;조한구;강동필;민경은
    • 한국전기전자재료학회논문지
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    • 제19권1호
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    • pp.46-51
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    • 2006
  • This paper reports on the effects of silicone oils, used as processing agents, on the recovery of hydrophobicity of silicone rubber. The recovery of hydrophobicity was evaluated by the measuring the contact angle, the surface electrical resistance and SEM. Here, we formed artificial contamination on the surface of samples, which scratched by sand papers and alumina powders. There was small recovery of hydrophobicity on the surface of SIR-A that silicone oil was not added. In both oil-added samples, SIR-B and SIR-C, recovery of hydrophobicity was achieved greatly. The surface of SIR-C showed that a lot of silicone oil was observed due to migration of oil, relatively in comparison with SIR-B. The tendency of recovery of hydrophobicity expressed by contact angle was in a good agreement with electrical property as determined by surface resistivity.

담체의 소수성과 표면 거칠기가 미생물 부착에 미치는 영향 (Effect of the Hydrophobicity and the Surface Roughness of Support Material on the Microbial Attachment)

  • 박영식;서정호;송승구
    • 한국환경과학회지
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    • 제6권6호
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    • pp.689-696
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    • 1997
  • This paper discussed effect of the surface roughness and the hydrophobicity of support material on the microbial attachment In a rotating biological contactor. The by- drophoblclty of each support material was determined by the measurement of contact angle of water and the surface roughness was measured by the surface roughness In- strument. Microorganisms have well attached on the surface of more hydrophilic support material like Nylon6 than that of the hydrophobic support material like PE. When the relatively hydrophilic surface was roughen, the microbial attachment was increased but when the relatively hydrophobic surface was roughen, the attachment was slightly In- creased because the hydrophobicity of support material was Increased by roughening the hydrophobic surface. Although both variables, the surface hydrophobicity and the surface roughness, have Influenced the microbial attachment, the influence of the surface roughness overruled that of the surface hydrophobicity. Support material whose surfaces were roughened about 1mm, 6mm and 11mm were allowed for attached 3, 7 and 24hr, but the differences of maximum and minimum attachment of each material gave nearly constant values and similar trend with time.

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pH, 전해질의 농도 및 알긴산 분자량이 분리콩단백질의 표면소수성에 미치는 영향 (Effects of pH, Electrolyte Concentrations, and Alginate Molecular Weights on Surface Hydrophobicity of Soy Protein Isolates)

  • 임영선;유병진
    • 한국식품영양과학회지
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    • 제45권9호
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    • pp.1285-1292
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    • 2016
  • 분리콩단백질(SPI, soy protein isolate) 농도, pH, 전해질의 종류와 농도, alginates의 농도와 분자량이 SPI의 표면소수성에 미치는 영향을 조사한 결과는 다음과 같다. SPI 농도가 증가할수록 표면소수성은 감소하였다. SPI의 표면소수성이 pH 7.0에서 최대값을 나타내었다가 pH가 7.0을 기준으로 증가 혹은 감소함에 따라 표면소수성이 감소하는 경향을 나타내었다. SPI의 표면소수성은 NaCl의 농도가 100 mM까지 증가함에 따라 급격히 증가하지만 더 이상의 농도에서는 변화가 없었다. $CaCl_2$$MgCl_2$의 농도가 각각 50 mM과 30 mM까지 증가할수록 SPI의 표면소수성이 급격히 감소하였지만, 그 이상의 농도에서는 큰 변화가 없었다. Na-alginate의 농도와 분자량의 증가함에 따라 SPI의 표면소수성이 감소한 것으로 나타났다. Na-alginate의 분자량이 증가함에 따라 표면소수성의 증가속도가 감소하였다.

코로나 방전에 따른 실리콘 고무의 표면 특성 (Surface Characteristics of Silicone Rubber Processes by Corona Discharges)

  • 한동희;조한구;강동필;민경은
    • 한국전기전자재료학회논문지
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    • 제15권2호
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    • pp.133-140
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    • 2002
  • This paper aims to investigate the effect of silicone oils as processing agent affecting the loss and recovery of hydrophobicity. The recovery of hydrophobicity was evaluated by the measurement of the surface electrical resistivity and the contact angle on the SIR surface. Two kinds of silicone oils (1 and 2) having different molecular weight were selected under a consideration of hydrophobicity and processability. SIR specimens were exposed to corona discharges in air and the specimens were analyzed with contact angle and surface resistance measurements. It was observed that the contact angle and the surface resistivity of SIR increase gradually with testing time. The fast recovery of hydrophobicity of SIR, expressed by the increment of contact angle and surface resistivity, was showed in SIR2 containing silicone oil 2.

표면특성 변화에 따른 유류분해 미생물의 토양내 거동성 조절

  • 류두현;목지예;최상일;김용미;이경애
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 2003년도 추계학술발표회
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    • pp.360-362
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    • 2003
  • The adhesion of hydrocarbon degrading bacteria(HDB) differing in surface hydrophobicity was investigated. Cell wall hydrophobicity was modified chemically and physiologically. Modified adhesion deficient mutant of HDB was selected in a soil column assay Physiologically and chemical modification increased cell surface hydrophobicity. Cell surface charcteristis including BATH and zeta potential were measured. Physiological modification using ampicillin was not stable, but chemical modification was stabel. Hydrocarbon degrading potential was measured for modified and unmodifed HDB.

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유류분해 미생물의 표면특성에 따른 분해성 및 거동성 변화

  • 류두현;목지예;최명석;김진명;김동일;전경화;박소연
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 2004년도 임시총회 및 추계학술발표회
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    • pp.273-276
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    • 2004
  • The adhesion of hydrocarbon degrading bacteria(HDB) differing in surface hydrophobicity was investigated. Cell wall hydrophobicity was modified chemically and physiologically. Modified adhesion deficient mutant of HDB was selected in a soil column assay. Physiologically and chemical modification increased cell surface hydrophobicity. Cell surface characteristics including BATH and FTIR were measured. Physiological modification using ampicillin was not stable, but chemical modification was stable. Hydrocarbon degrading efficiency was measured of TPH modified and unmodifed HDB.

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Effect of Surface Charge in Hydrophobicity of Insulating Material and Decay of Surface Voltage after Corona Charging

  • Huh, Chang-Su;Youn, Bok-Hee;Seo, You-Jin;Hwang, Sun-Mook
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2003년도 춘계학술대회 논문집 유기절연재료 방전 플라즈마연구회
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    • pp.1-5
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    • 2003
  • This paper presented the effects of accumulation of surface charges on hydrophobicity level and the surface states of silicone polymer used for outdoor insulator treated by ultraviolet irradiation and corona discharge through measuring surface voltage decay of a corona-charged specimen were investigated. The surface resistivity by the method of the surface potential decay was compared with the value by the three electrodes methods. From this study, it was found that the accumulation of surface charges above a critical surface voltage on silicone insulating materials could lead to the temporary loss of surface hydrophobicity. In addtion, uv stress lead to a longer decay time of surface charges. We could conclude that the effects of surface charges on hydrophocity level and the changes of surface state by various artificial treatments were understood through a trend of surface potential decay.

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미생물 세포표면의 소수성과 이용 (Hydrophobicity of Microbial Cell Surface and its Applications)

  • 박신혜;이홍금
    • KSBB Journal
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    • 제16권3호
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    • pp.225-232
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    • 2001
  • 미생물 세표표면의 소수성은 다른 미생물과의 flocculation, 액상이나 고형물질에 부착하거나 수용액에서의 부유현상 (floatation)과 같이 미생물과 다양한 물질사이의 표면 반응에 관여한다. 이러한 점에서 미생물 세포의 소수성은 의학분야 뿐만 아니라 생물공학의 다양한 분야에서 중요한 의미를 갖는다. 이 총설에서논 미생물 세포표면의 소수성과 관련된 특성과 물질, 그리고 세포표면의 소수성을 이용한 예를 중점적으로 기술하였다.

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옥외용 실리콘 절연재료의 발수성에 미치는 표면전하의 영향과 표면 상태에 따른 표면전위 감쇠 (Effects of Surface Charges on Hydrophobicity and Surface Potential Decay with Various Surface States of Silicone Rubber for Outdoor Insulator)

  • 연복희;박충렬;허창수
    • 한국전기전자재료학회논문지
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    • 제15권8호
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    • pp.678-686
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    • 2002
  • This paper presents the effects of accumulation of surface charges on hydrophobic level and the changes of surface potential decay with various artificial environment treatments on high temperature vulcanized (HTV) silicone rubber used for outdoor insulating material. For this study, the charging apparatus by corona discharge, in which grid electrode was installed between the main corona and ground electrode, was used. From this study, it was found that the accumulation of surface charges above a critical surface potential on silicone insulating materials could lead to the temporary loss of surface hydrophobicity. In addition, corona stress and water absorption stress increase the decay rate of surface charges of HTV silicone rubber, while ultraviolet (UV) stress causes longer decay time. We could conclude that the effects of surface charges on hydrophobicity level and the changes of surface state by various artificial treatments were found through a trend of surface potential decay.