Surface activity of alcohols ethoxylates at the n-heptane/water interface

Valenzuela, Matías A.; Gárate, M. Pilar; Olea, Andrés F.

doi:10.1016/j.colsurfa.2007.04.059

Cited by 26 publications

(17 citation statements)

References 31 publications

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“…A detailed description of the synthesis and characterization of these compounds has been given elsewhere [9]. Heptane and methylene blue chloride, purchased from Merck, were used as received.…”

Section: Methodsmentioning

confidence: 99%

“…The solubility of C i EO j surfactants in heptane was previously determined in a wide range of concentrations [9]. All surfactants become insoluble at very low concentrations.…”

Section: Solubility and Cmcmentioning

confidence: 99%

“…In previous work, it has been found that these surfactants exhibit surface activity and form micelles in liquid CO 2 [8]. In heptane, the interfacial activity of these surfactants depends on the length of both EO and C groups [9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aggregation of Alcohols Ethoxylates in n‐Heptane

Gárate

Valenzuela

Gárate

et al. 2009

J Surfact & Detergents

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The solubility and aggregation process of polyethoxylated non-ionic surfactants, of general formula C i H 2i?1 -(O-CH 2 -CH 2 ) j -OH with i = 6, 8, 10 and j = 3-6 (C i EO j ), in heptane were studied. The aggregation of C i EO j surfactants in heptane was investigated by using methylene blue (MB) as an absorption probe. In solutions of MB in the presence of these surfactants in heptane, at concentrations larger than the re-dissolution concentration, the UV bands associated to free MB (A 1 ) and MB-EO complex (A 2 ) were detected. The ratio of these intensities A 2 /A 1 , was used to study the kinetics of the complex formation in pure surfactant. The value of A 2 /A 1 depends on the surfactant structure and the media wherein MB is dissolved, being larger in the pure surfactant than in heptane solutions. These results are explained in terms of solvent effect and aggregate structures on the complex formation.

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Section: Methodsmentioning

confidence: 99%

“…The solubility of C i EO j surfactants in heptane was previously determined in a wide range of concentrations [9]. All surfactants become insoluble at very low concentrations.…”

Section: Solubility and Cmcmentioning

confidence: 99%

See 1 more Smart Citation

Aggregation of Alcohols Ethoxylates in n‐Heptane

Gárate

Valenzuela

Gárate

et al. 2009

J Surfact & Detergents

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“…Reorientation model (or two-state model) describes well adsorption behaviour of different oxyethylene surfactants on liquid-air interfaces [2][3][4][5][6]. At low surface concentrations both carbohydrate and oxyethylene groups of those surfactants adsorb simultaneously.…”

Section: Reorientation Modelmentioning

confidence: 99%

Equilibrium and dynamic surface properties of trisiloxane aqueous solutions. Part 2. Theory and comparison with experiment

Ritacco

Fainerman

Ortega

et al. 2010

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The influence of the hydrocarbon chain length as well as of the number of ethylene oxide (EO) groups on the adsorption of polyoxyethylene-based non-ionic surfactants at the air/water [19,20] and oil/water [21] interfaces has been previously reported. In addition, the surface properties of polyoxyethylene glycerol esters derived from cocoa oil, namely equilibrium adsorption, dynamic surface tension and surface rheology, have been recently reported [22].…”

Section: Introductionmentioning

confidence: 99%