• Title/Summary/Keyword: critical micelle concentration (CMC)

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Characterization of Glycolipid Biosurfactants from an Isolated Strain of Pseudomonas aeruginosa YPJ80

  • Cho, Joong-Hoon;Jeong, Yong-Leen;Park, Oh-Jin;Yoon, Byung-Dae;Yang, Ji-Won
    • Journal of Microbiology and Biotechnology
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    • v.8 no.6
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    • pp.645-649
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    • 1998
  • A glycolipid type of biosurfactants was obtained from a strain which had been isolated from soil. The cell was identified as Pseudomonas aeruginosa from taxonomic characteristics and was designated as YPJ80. Thin layer chromatography and deoxyhexose detection tests were done to verify the type of biosurfactant. Critical micelle concentration (CMC) of the surfactant was observed to be 50 ppm and the minimum surface tension was 30.1 mN/m. As an emulsifier, YPJ80 biosurfactant was superior to emulsan in the emulsification of crude Arabian light oil.

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Studies on the Polymeric Surfactants (IV);Synthesis Activities of Sodium ${\alpha}-Sulfo$ Fatty Acid Allyl Ester Oligomers (고분자(高分子) 계면활성제(界面活性劑)에 관한 연구(硏究) (제(第) 4 보(報));나트륨 알파술폰 지방산(脂肪酸) 알릴에스테르 올리고머류(類)의 계면활성(界面活性))

  • Lee, Seung-Yeoll;Kim, Jin-Heon;Nam, Ki-Dae
    • Journal of the Korean Applied Science and Technology
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    • v.6 no.2
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    • pp.53-58
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    • 1989
  • A series of four sodium ${\alpha}-sulfo$ fatty acid allylester oligomers such as sodium ${\alpha}-sulfo$ lauric acid allylester oligomer, sodium ${\alpha}-sulfo$ myristic acid allyl ester oligomer, sodium ${\alpha}-sulfo$ palmitic acid allyl ester oligomer and sodum ${\alpha}-sulfo$ stearic acid allyl ester oligomer were examined for surface tension, defloculation effect and emulsifying power. Also critical micelle concentration (cmc) was evaluated. Consequently, these sodium allyl ${\alpha}-sulfo$ aliphatic carboxylate aligomers show o/w type emulsifying agent and dispersion effect in 1g/100ml soulution.

The Effect of Nonionic Surfactants on the Solubility and Biodegradation of PAHs in Soil Slurry (PAHs의 용해도와 생분해에 미치는 비이온계 계면활성제의 영향)

  • 박종섭;김인수
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 1998.11a
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    • pp.174-177
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    • 1998
  • The effects of surfactants affecting polycyclic Aromatic Hydrocarbon(PAHs) solubility and biodegradation in soil slurry were investigated. The critical micelle concentration(CMC) values of surfactants used in this study were 12.7mg/L(Brij 30), 13.4mg/L(Tween 80), 13.6mg/t(Triton X-100). The solubility of PAH increased as the Hydrophile-Lipophile Balance(HLB) value of surfactant decrease. At surfactant biodegradation and toxicity experiement using respirometer, Brij 30 did not show any toxic effect and substrate inhibition upon the level of 1.5g/L. Also, biodegradation of Brij 30 gave no reduction on the phenanthrene biodegradation rate. When the desorption rate of phenanthrene between sand and clay is compared, lower percentage of phenanthrene was desorbed at clay because of the larger surface aera and higher organic content of clay. At the biodegradation experiments of phenanthrene in soil slurry phase, more than 90% of initial phenanthrene adsorbed onto both sand and clay were biodegraded by phenanthrene- acclimated cultures.

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Comparison of different surfactant system for simultaneous removal of nitrate and phosphate using micellar-enhanced ultrafiltration

  • 김보경;백기태;김호정;이율리아;양지원
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2003.09a
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    • pp.417-421
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    • 2003
  • Three kinds of surfactant systems - cationic surfactant (system 1), combinition of two cationic surfactants (system 2), and combination of two cationic surfactant and non-ionic surfactant (system 3) - for the simultaneous removal of nitrate and phosphate by micellar-enhanced ultrafiltration (MEUF) were investigated. The highest removal efficiencies of nitrate and phosphate were observed in system 2, which were 90 % of nitrate and 72 % of phosphate. The COD of permeate in system 3 was the lowest, because the added non-ionic surfactant made critical micelle concentration (CMC) lower than that of other surfactant systems. In all systems, the flux decline was similar.

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Sophorolipid Production by Candida bombicola ATCC 22214 from a Corn-Oil Processing Byproduct

  • KIM , HYUN-SOO;KIM, YOUNG-BUM;LEE, BAEK-SEOK;KIM, EUN-KI
    • Journal of Microbiology and Biotechnology
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    • v.15 no.1
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    • pp.55-58
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    • 2005
  • Sophorolipid was produced by Candida bombicola ATCC 22214 from soybean dark oil, a byproduct of soybean oil processing. With a fed-batch culture of C. bombicola for 7 days, 90 g/l of sophorolipid was obtained. The CMC (critical micelle concentration) and minimum surface tension of the sophorolipid in aqueous solution were found to be 150 mg/l and 48 mN/m, respectively. The dispersion capability of sophorolipid was higher than that of the chemical surfactants such as SDS and Brij30. The molar solubility ratio (MSR) of 4-methylnaphthalene was 0.2. Linoleic and oleic acids were the main constituents of the fatty acid composition of the sophorolipid. The sophorolipid showed antimicrobial activity against Propionibacterium acne and Bacillus subtilis.

The Synthesis and Surface Properties of N-Acyl-N-Methyl Taurates (N-아실-N-메틸 타우린 염류의 합성 및 계면성)

  • Jeong, No-Hee;Nam, Ki-Dae;Kim, Tae-Yeong
    • Journal of the Korean Applied Science and Technology
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    • v.9 no.1
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    • pp.1-6
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    • 1992
  • New five N-acyl-N-methyl taurate and their sodium salts were synthesized by acylating sodium N-methyl taurate in water in the presense of inorganic alkali as a catalyst. Wherein acyl group is a straight-chain radical of 10 to 18 carbon atoms. These compounds were identified by infrared spectroscopy. Surface activities of these sodium N-acyl-N-methyl taurate including surface tension, Ross-Miles foaming powers, foam stabilities, emulsifying powers and detergency were measured respectively. Also critical micelle concentration(cmc) were evaluated. Consequently these anionic surfactants with long chain acyl amine showed good emulsifying power of O/W type and had a good detergence.

Synthesis of Surface Active Properties of Destructible Surfactants with 1,3-Dioxane (1,3-디옥산을 함유한 분해성 계면활성제의 합성의 및 계면 특성)

  • Kim, Chi-Hoi;Roh, Yun-Chan;Kim, Yu-Ok;Nam, Kie-Dae
    • Journal of the Korean Applied Science and Technology
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    • v.13 no.3
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    • pp.61-71
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    • 1996
  • In acid-catalyzed acetal cyclization of long aliphatic aldehydes($R=n-C_7H_{15}$ ; $n-C_9H_{19}$ ; $n-C_{11}H_{23}$) with 1,1,1-tris(hydroxymethyl)propane, 2-alkyl-5-hydroxymethyl-5-ethyl-1,3-dioxanes were obtained. The final products, sodium 2-alkyl-5-(sulfonatedpropylethermethyl)-5-ethyl-1,3-propanesultion in the presence of sodium hydride. These compounds were a new group of destructible surfactants which were readily hydrolyzed and oxidized in natural water reservoirs. Physical properties of these new compounds involved some surface properties such as Krafft point(Kp), critical micelle concentration(cmc), surface tension of aqueous solutions near cmc(${\gamma}_{min}$), foaming power, emulsion power and hydrolysis properties were determined. The destructible surfactants containing 1,3-dioxane ring were synthesized to about $85{\pm}5.5%$ yield. The cmc values of the compounds by ring method were assumed to $0.5{\sim}5.0{\times}10^{-3}mol/L$ range and surface tensions at cmc were $29.5{\sim}33.0dyne/cm$ respectively at $25^{\circ}C$. The foaming power and foam stability were $170{\sim}230mm$ and $52{\sim}135mm$ respectively at $1{\times}10^{-2}mol/L$, foam was occurred rarely below $1{\times}10^{-3}mol/L$. The emulsion property of liquid paraffin was better than that of soybean oil. For hydrolysis property with ph and time, these compounds were decomposed within about 200minutes at $ph1{\sim}2$. Hopefully these compounds are expected to be a good O/W emulsifier that have decomposability in acid and may be used in the process which do not need foaming.

The Pressure Effects on the Micellization of Dodecylpyridinium Bromide in Urea Aqueous Solutions (요소-수용액에서 Dodecylpyridinium Bromide의 미셀화에 미치는 압력효과)

  • Chung Jong-Jae;Lee Sang-Wook;Roh Byung-Gil;Choi Joon-Ho
    • Journal of the Korean Chemical Society
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    • v.36 no.1
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    • pp.28-32
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    • 1992
  • The critical micelle concentration(CMC) values of Dodecylpyridinium bromide(DoPB) were determined by an electric conductivity method at 1${\sim}$2000 bars and $25^{\circ}C$. The CMC of DoPB increases with the addition of urea in the whole pressure region studied, and the CMC increases with an increase of the pressure in the low-pressure region, while in the high-pressure region the CMC decreases. The partial molar volume change $({\Delta}V^m_o)$ on micellization was also investigated in some urea aqueous solutions. The change $({\Delta}V^m_o)$ was reduced by the addition of urea. The results suggest that the "iceberg" structure of water around the hydrocarbon chain of the monomeric surfactant is effectively broken down by urea.

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A Study on the Environmentally Fraternized Preparation of Core-Shell Binder (환경친화적인 Core-Shell Binder의 제조에 관한 연구)

  • Kwon, Jae-Beom;Lee, Nae-Woo;Seol, Soo-Duck;Lim, Jae-Koel;Lim, Jong-Min
    • Journal of the Korean Society of Safety
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    • v.18 no.4
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    • pp.78-84
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    • 2003
  • Core-shell composite particles of organic/organic were polymerized by using monomers such as methyl methacrylate(MMA) and styrene(St) in the presence of sodium dodecyl benzene sulfonate (SDBS) below critical micelle concentration(CMC) changing concentration, kind of initiators, emulsifiers, addition method of monomers and speed of agitation. In the PMMA/PSt and PSt/PMMA core-shell polymerization, to suppress the generation of new particles and to minimize the coagulation during the shell polymerization, the optimum conditions were $1.45{\times}10^{-5}mol/L$ and $2.91{\times}10^{-5}mol/L$ at concentration of SDBS respectively. The optimum concentration of the other initiator was $1.58{\times}10^{-3}mol/L$ of ammonium persulfate(APS) for core polymerization and $4.0{\times}10^{-4}mol/L$ of APS for shell polymerization.

Synthesis and Characterization of Interfacial Properties of Sorbitan Laurate Surfactant (Sorbitan Laurate 계면활성제 합성 및 계면 특성에 관한 연구)

  • Lee, Seul;Kim, ByeongJo;Lee, JongGi;Lim, JongChoo
    • Applied Chemistry for Engineering
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    • v.22 no.1
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    • pp.37-44
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    • 2011
  • The critical micelle concentration (CMC) of sorbitan laurate SP 20 surfactant in this paper was near $7.216{\times}10^{-4}mol/L$ and the surface tension at CMC was about 26.0 mN/m, which showed higher CMC and lower surface tension than those of octylphenol ethoxylate octylphenol ethoxylate (OPE) 10 surfactant. Dynamic surface tension measurement using a maximum bubble pressure tensiometer showed that the adsorption rate at the interface between air and surfactant solution was found to be slower with SP 20 surfactant, presumably due to a low mobility of SP 20 surfactant monomer. The contact angle of SP 20 surfactant solution was observed to decrease with an increase in surfactant concentration and showed a larger value than that of OPE 10 surfactant solution. Half-life time for foams generated with 1 wt% surfactant solution was also larger with SP 20 surfactant, which indicated higher foam stability with SP 20 surfactant. Dynamic behavior study reveals that the solubilization of n-decane oil was much lower with SP 20, which is in good agreement with experimental results of foam stability, contact angle and CMC. Dynamic interfacial tension measurement by a spinning drop tensiometer shows that interfacial tensions at equilibrium condition in both systems were almost the same but the time required to reach equilibrium was longer with SP 20.