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  Phase transitions in non-ionic detergent micelles

Grell, E., Lewitzki, E., Schneider, R., Ilgenfritz, G., Grillo, I., & von Raumer, M. (2002). Phase transitions in non-ionic detergent micelles. Journal of Thermal Analysis and Calorimetry, 68(2), 469-478.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-DC2E-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-DC2F-4
Genre: Journal Article

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 Creators:
Grell, E.1, Author              
Lewitzki, E.2, Author              
Schneider, R., Author
Ilgenfritz, G., Author
Grillo, I., Author
von Raumer, M., Author
Affiliations:
1Department of Biophysical Chemistry, Max Planck Institute of Biophysics, Max Planck Society, ou_2068289              
2Department of Molecular Neurogenetics, Max Planck Institute of Biophysics, Max Planck Society, ou_2068296              

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Free keywords: CMC; DSC; detergent; growth; light scattering; neutron scattering; non-ionic micelle; poly(ethyleneglycol) alkylether; thermal transition; viscosity
 Abstract: Differential scanning calorimetry (DSC) studies of micellar, 60 mM solutions of the octaethyleneglycol alkylethers C14E8 and C16E8 provide evidence for a narrow endothermic transition at 41 and 32degreesC, respectively, characterized by an enthalpy change of 2 kJ mol(-1) for both detergents. The observed thermal transition is indicative of a concerted transition of the surfactant molecules, as illustrated on the basis of a simple molecular model. The effect of co-solvents such as different alcohols on the thermal transition is investigated. Glycerol markedly lowers the transition temperature whereas the transition is absent in the presence of at least 10% ethanol. The calorimetric transition correlates with the temperature dependent increase of viscosity and static light scattering as well as with changes observed by small-angle neutron scattering (SANS). The SANS results provide clear evidence for a distinct structural change occurring at the transition temperature, which is interpreted as a sphere-to-rod transition of the detergent micelles. Moreover, the rod length increases with increasing temperature. We suggest that the process causing the thermal transition acts as the prerequisite of the growth process.

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Language(s): eng - English
 Dates: 2002
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 12006
ISI: 000176363300011
 Degree: -

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Title: Journal of Thermal Analysis and Calorimetry
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 68 (2) Sequence Number: - Start / End Page: 469 - 478 Identifier: -