Nonionic surface-active agents

Becher, Paul; Trifiletti, Suzanne E.

doi:10.1016/0021-9797(73)90394-9

Cited by 32 publications

(1 citation statement)

References 12 publications

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“…Studies with nonionic surfactants have shown that CMC increases and average aggregation number decreases when the solvent dielectric constant decreases (11,23). Becher et al (24,25) showed that adding ethanol or dioxane to aqueous solutions of polyoxyethylene [23] dodecyl ether destroys micelles, eventually reaching a composition where no micelles are present in solution. Deguchi et al (26) observed similar results when mixing aqueous polyoxyethylene [7] dodecyl ether solutions with methanol, ethanol, 2-propanol, 1-propanol, dioxane, propylene glycol or ethylene glycol.…”

Section: Nominal Degree Of Unsaturationmentioning

confidence: 99%

Aggregation of unsaturated long‐chain fatty alcohols in nonaqueous systems

Dunn

Bagby

1995

J Americ Oil Chem Soc

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Aggregation and related phenomena in nonaqueous binary and ternary solutions containing unsaturated longchain fatty alcohol arnphiphiles have been studied. Six C18 fatty alcohols were studied--oleyl alcohol (9Z-octadecen-l-ol), elaidyl alcohol (9E-octadecen-l-ol), linoleyl alcohol (9Z, 12Zoctadecadien-1-ol), elaidolinoleyI alcohol (9E, 12E-octadecadien-1-ol), linolenyl alcohol (9Z, 12Z, 15Z-octadecatrien-1-ol) and elaidolinolenyl alcohol (9E, 12E, 15E-octadecatrien-1-ol). Equivalent conductivity and photon correlation spectroscopy confirmed that unsaturated long-chain fatty alcohols form large and polydisperse aggregates in methanol. Critical micelle concentration (CMC) results showed that the degree of unsaturation and configuration of the double bonds in the fatty alcohol significantly influences aggregation. Aggregation of oleyl alcohol in a series of straight and branched medium-chainlength (C3-C 8) alkanol solvents was studied. For shorter-chained alkanols (C1-C4), decreasing solvent dielectric constant decreases the CMC; however, for longer-chained alkanols (C4-C8) , no significant effects occurred on the CMC. The effect of solubilized soybean oil on the viscosity of long-chain fatty alcohol/methanol solutions was also analyzed. Relative viscosity resuits were consistent with those expected for microemulsions. Although preliminary in nature, these results generally support the notion that soybean oil is solubilized by incorporation into large soybean oil-in-fatty alcohol aggregates in methanol solvent, resembling a nonaqueous detergentless microemulsion. JAOCS 72, 123-130 (1995).

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Section: Nominal Degree Of Unsaturationmentioning

confidence: 99%

Aggregation of unsaturated long‐chain fatty alcohols in nonaqueous systems

Dunn

Bagby

1995

J Americ Oil Chem Soc

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Relationship among Emulsion Type, Emulsion Stability and the Presence of Additives

Marszall¹

1978

Fette, Seifen, Anstrichm.

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Aus den Angaben der Tabelle kann man folgende Eine Aminogruppe ist der Triger der antimikrobiellen Wirksamkeit, wobeiwas aus zusatzlichen Untersuchungen hervorgehtprimke Aminogruppen ein breiteres Wirkungsspektrum bewirken als sekundare oder tertiare.Die Alkylkette mit der Kettenliinge Clo bis C,, ist fur die Permeation der Mikrobenmembran niitig, sie ermiiglicht das Vordringen der Wirksubstanz zum Wirkort. Amidgruppen sind, und das ist aus der Tabelle nicht ablesbar, off enbar wichtig fur die dermatologische Vertraglichkeit, zur antimikrobiellen Aktivitat tragen sie nichts bei.Schliisse ziehen: 5. S c h 1 u l b e m e r k u n g e n Welche Chancen hat nun ein neuer antimikrobieller Wirkstoff wie DODECA? Seit Jahrzehnten behaupten Aldehyde und aldehydabspaltende Mittel sowie Phenole ihre starke Stellung als Konserviemngs-und Desinfektionsmittel. Sie sind aulerordentlich billig und bei genugend hoher Dosierung gut wirksam, weisen aber aus toxikologischer Sicht und anwendungstechnish einige Nachteile auf, ihr Geruch ist in vielen Praparationen aufierordentlich storend. Wirksame Verbindungen mit chemisch neuartigen Strukturen, die toxikologisch giinstig sind und nur wenig oder gar nicht riechen, haben deshalb eine gute Chance fur die Zukunft, nicht umsonst ist die Suche nach solchen Substanzen weltweit.

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The Determination of the Effective HLB of Nonionic Surfactants by a Phenol Titration II: The Effect of Several Hydroxy Compounds

Marszall¹

1980

Fette, Seifen, Anstrichm.

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The nonionic surfactants polyoxyethylene nonyl phenol ethers have been used as models for the investigation of the change of the effective HLB of surfactants under influence of several hydroxy compounds using the phenol index method. These water‐soluble additives include alcohols, glycols and glycol ethers. The change of the effective HLB of nonionic surfactant depends on the amounts and hydrophobicity of studied additives. In order to explain the change of the effective HLB of surfactants, the considerations based on the effects of the same additives on the micelle formation are also presented. These results are in remarkable agreement with the effects of the same substances on the effective HLB using other methods.

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Nonionic surface-active agents

Cited by 32 publications

References 12 publications

Aggregation of unsaturated long‐chain fatty alcohols in nonaqueous systems

Aggregation of unsaturated long‐chain fatty alcohols in nonaqueous systems

Relationship among Emulsion Type, Emulsion Stability and the Presence of Additives

The Determination of the Effective HLB of Nonionic Surfactants by a Phenol Titration II: The Effect of Several Hydroxy Compounds

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