Bound and free water in surfactant micelles and lipid vesicles

Michel Picquart; Donato Valdez; Humberto Vázquez; Wladimir Urbach; Marcel Waks

doi:10.1063/1.1928163

Bound and free water in surfactant micelles and lipid vesicles

Michel Picquart, Donato Valdez, Humberto Vázquez, Wladimir Urbach, Marcel Waks

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2 Scopus citations

Abstract

Inverse micelles of surfactant AOT at low water contents are studied. From RMN measurements the molar fraction of bound water was obtained. Ultrasonic measurements, which depend on the compressibility, permit to determine the internal radius (water radius) of the micelles. With both results, the size of the bound water layer in this system was found around 0.3 nm. Correlated changes in the FT-IR absorption spectra give us information about the interaction between water and the polar head of AOT. Multilamellar vesicles, at different concentrations, of phospholipid DPPC, studied by DSC and FT-IR present a sub-zero transition near -40°C. This transition is attributed to the interstitial water, i.e. the water confined between two DPPC bilayers. These results emphasize the peculiar properties of the bound water in such systems.

Original language	English
Title of host publication	MATERIALS SCIENCE AND APPLIED PHYSICS
Subtitle of host publication	2nd Mexican Meeting on Mathematical and Experimental Physics
Pages	103-110
Number of pages	8
DOIs	https://doi.org/10.1063/1.1928163
State	Published - 21 Apr 2005
Externally published	Yes
Event	2nd Mexican Meeting on Mathematical and Experimental Physics - Mexico City, Mexico Duration: 6 Sep 2004 → 10 Sep 2004

Publication series

Name	AIP Conference Proceedings
Volume	759
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	2nd Mexican Meeting on Mathematical and Experimental Physics
Country/Territory	Mexico
City	Mexico City
Period	6/09/04 → 10/09/04

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10.1063/1.1928163

Cite this

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title = "Bound and free water in surfactant micelles and lipid vesicles",

abstract = "Inverse micelles of surfactant AOT at low water contents are studied. From RMN measurements the molar fraction of bound water was obtained. Ultrasonic measurements, which depend on the compressibility, permit to determine the internal radius (water radius) of the micelles. With both results, the size of the bound water layer in this system was found around 0.3 nm. Correlated changes in the FT-IR absorption spectra give us information about the interaction between water and the polar head of AOT. Multilamellar vesicles, at different concentrations, of phospholipid DPPC, studied by DSC and FT-IR present a sub-zero transition near -40°C. This transition is attributed to the interstitial water, i.e. the water confined between two DPPC bilayers. These results emphasize the peculiar properties of the bound water in such systems.",

author = "Michel Picquart and Donato Valdez and Humberto V{\'a}zquez and Wladimir Urbach and Marcel Waks",

year = "2005",

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series = "AIP Conference Proceedings",

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note = "2nd Mexican Meeting on Mathematical and Experimental Physics ; Conference date: 06-09-2004 Through 10-09-2004",

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Picquart, M, Valdez, D, Vázquez, H, Urbach, W & Waks, M 2005, Bound and free water in surfactant micelles and lipid vesicles. in MATERIALS SCIENCE AND APPLIED PHYSICS: 2nd Mexican Meeting on Mathematical and Experimental Physics. AIP Conference Proceedings, vol. 759, pp. 103-110, 2nd Mexican Meeting on Mathematical and Experimental Physics, Mexico City, Mexico, 6/09/04. https://doi.org/10.1063/1.1928163

Bound and free water in surfactant micelles and lipid vesicles. / Picquart, Michel; Valdez, Donato; Vázquez, Humberto et al.
MATERIALS SCIENCE AND APPLIED PHYSICS: 2nd Mexican Meeting on Mathematical and Experimental Physics. 2005. p. 103-110 (AIP Conference Proceedings; Vol. 759).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - Bound and free water in surfactant micelles and lipid vesicles

AU - Picquart, Michel

AU - Valdez, Donato

AU - Vázquez, Humberto

AU - Urbach, Wladimir

AU - Waks, Marcel

PY - 2005/4/21

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N2 - Inverse micelles of surfactant AOT at low water contents are studied. From RMN measurements the molar fraction of bound water was obtained. Ultrasonic measurements, which depend on the compressibility, permit to determine the internal radius (water radius) of the micelles. With both results, the size of the bound water layer in this system was found around 0.3 nm. Correlated changes in the FT-IR absorption spectra give us information about the interaction between water and the polar head of AOT. Multilamellar vesicles, at different concentrations, of phospholipid DPPC, studied by DSC and FT-IR present a sub-zero transition near -40°C. This transition is attributed to the interstitial water, i.e. the water confined between two DPPC bilayers. These results emphasize the peculiar properties of the bound water in such systems.

AB - Inverse micelles of surfactant AOT at low water contents are studied. From RMN measurements the molar fraction of bound water was obtained. Ultrasonic measurements, which depend on the compressibility, permit to determine the internal radius (water radius) of the micelles. With both results, the size of the bound water layer in this system was found around 0.3 nm. Correlated changes in the FT-IR absorption spectra give us information about the interaction between water and the polar head of AOT. Multilamellar vesicles, at different concentrations, of phospholipid DPPC, studied by DSC and FT-IR present a sub-zero transition near -40°C. This transition is attributed to the interstitial water, i.e. the water confined between two DPPC bilayers. These results emphasize the peculiar properties of the bound water in such systems.

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Bound and free water in surfactant micelles and lipid vesicles

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