Microstructures in the aqueous solutions of a hybrid anionic fluorocarbon/hydrocarbon surfactant

Dganit Danino; Daphne Weihs; Raoul Zana; Greger Orädd; Göran Lindblom; Masahiko Abe; Yeshayahu Talmon

doi:10.1016/S0021-9797(02)00079-6

Microstructures in the aqueous solutions of a hybrid anionic fluorocarbon/hydrocarbon surfactant

Dganit Danino, Daphne Weihs, Raoul Zana, Greger Orädd, Göran Lindblom, Masahiko Abe, Yeshayahu Talmon^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

Abstract

The aqueous solutions of the anionic hybrid fluorocarbon/hydrocarbon surfactant sodium 1-oxo-1[4-(tridecafluorohexyl)phenyl]-2-hexanesulfate (FC6HC4) shows peculiar rheological behavior. At 25°C the viscosity vs concentration curve goes successively through a maximum and a minimum, while the viscosity vs temperature curve of the 10 wt% aqueous FC6HC4 solution goes through a marked maximum at 36°C [Tobita et al., Langmuir 13 (1997) 5054]. In an attempt to explain these properties the microstructure of aqueous solutions of FC6HC4 has been investigated by means of digital light microscopy, transmission electron microscopy at cryogenic temperature (cryo-TEM), rheology, and self-diffusion NMR. At 20°C, the increase of the FC6HC4 concentration was found to result in a progressive change of structure of the surfactant assemblies from mainly spherical micelles at 0.5 wt% to mainly cylindrical micelles at 10 wt%. At intermediate concentrations small disklike micelles and small complete and incomplete vesicles coexisting with cylindrical micelles were visualized. The occurrence of stretched cylindrical micelles is responsible for the effect of the surfactant concentration on the solution viscosity. Cryo-TEM, rheology, and self-diffusion NMR all suggest that an increase of the temperature brings about a growth of the assemblies present in the 10 wt% solution of FC6HC4. The structure of the assemblies present at the temperature where the viscosity is a maximum could not be elucidated by cryo-TEM because of the probable occurrence of an on-the-grid phase transformation, the result of blotting during specimen preparation. Nevertheless, the results show that the observed large assemblies break up at higher temperature to give rise to a more labile bicontinuous structure that consists of multiconnected disordered lamellae, with many folds and creases, and that may well be the L₃ phase.

Original language	English
Pages (from-to)	382-390
Number of pages	9
Journal	Journal of Colloid and Interface Science
Volume	259
Issue number	2
DOIs	https://doi.org/10.1016/S0021-9797(02)00079-6
State	Published - 15 Mar 2003
Externally published	Yes

Keywords

Cryo-TEM
Hybrid fluorinated surfactant
L3 phase
Lamellar phase
Rheology
Self-diffusion NMR

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10.1016/S0021-9797(02)00079-6

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title = "Microstructures in the aqueous solutions of a hybrid anionic fluorocarbon/hydrocarbon surfactant",

abstract = "The aqueous solutions of the anionic hybrid fluorocarbon/hydrocarbon surfactant sodium 1-oxo-1[4-(tridecafluorohexyl)phenyl]-2-hexanesulfate (FC6HC4) shows peculiar rheological behavior. At 25°C the viscosity vs concentration curve goes successively through a maximum and a minimum, while the viscosity vs temperature curve of the 10 wt% aqueous FC6HC4 solution goes through a marked maximum at 36°C [Tobita et al., Langmuir 13 (1997) 5054]. In an attempt to explain these properties the microstructure of aqueous solutions of FC6HC4 has been investigated by means of digital light microscopy, transmission electron microscopy at cryogenic temperature (cryo-TEM), rheology, and self-diffusion NMR. At 20°C, the increase of the FC6HC4 concentration was found to result in a progressive change of structure of the surfactant assemblies from mainly spherical micelles at 0.5 wt% to mainly cylindrical micelles at 10 wt%. At intermediate concentrations small disklike micelles and small complete and incomplete vesicles coexisting with cylindrical micelles were visualized. The occurrence of stretched cylindrical micelles is responsible for the effect of the surfactant concentration on the solution viscosity. Cryo-TEM, rheology, and self-diffusion NMR all suggest that an increase of the temperature brings about a growth of the assemblies present in the 10 wt% solution of FC6HC4. The structure of the assemblies present at the temperature where the viscosity is a maximum could not be elucidated by cryo-TEM because of the probable occurrence of an on-the-grid phase transformation, the result of blotting during specimen preparation. Nevertheless, the results show that the observed large assemblies break up at higher temperature to give rise to a more labile bicontinuous structure that consists of multiconnected disordered lamellae, with many folds and creases, and that may well be the L3 phase.",

keywords = "Cryo-TEM, Hybrid fluorinated surfactant, L3 phase, Lamellar phase, Rheology, Self-diffusion NMR",

author = "Dganit Danino and Daphne Weihs and Raoul Zana and Greger Or{\"a}dd and G{\"o}ran Lindblom and Masahiko Abe and Yeshayahu Talmon",

note = "Funding Information: This work was supported in part by a “Center of Excellence” grant from the Israel Science Foundation of the Israel Academy of Sciences and Humanities, and by a Technion VPR Fund, R. and M. Rochlin Fund. The cryo-TEM work was performed at the “Cryo-TEM Hannah and George Krumholz Laboratory for Advanced Microscopy” at the Technion, part of the “Technion Project on Complex Fluids.” We thank Judith Schmidt and Berta Shdemati for excellent technical assistance. D.W. is grateful for the Levi Eshkol scholarship, awarded by the Israel Ministry of Science, Culture, and Sport. ",

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doi = "10.1016/S0021-9797(02)00079-6",

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AU - Danino, Dganit

AU - Weihs, Daphne

AU - Zana, Raoul

AU - Orädd, Greger

AU - Lindblom, Göran

AU - Abe, Masahiko

AU - Talmon, Yeshayahu

N1 - Funding Information: This work was supported in part by a “Center of Excellence” grant from the Israel Science Foundation of the Israel Academy of Sciences and Humanities, and by a Technion VPR Fund, R. and M. Rochlin Fund. The cryo-TEM work was performed at the “Cryo-TEM Hannah and George Krumholz Laboratory for Advanced Microscopy” at the Technion, part of the “Technion Project on Complex Fluids.” We thank Judith Schmidt and Berta Shdemati for excellent technical assistance. D.W. is grateful for the Levi Eshkol scholarship, awarded by the Israel Ministry of Science, Culture, and Sport.

PY - 2003/3/15

Y1 - 2003/3/15

N2 - The aqueous solutions of the anionic hybrid fluorocarbon/hydrocarbon surfactant sodium 1-oxo-1[4-(tridecafluorohexyl)phenyl]-2-hexanesulfate (FC6HC4) shows peculiar rheological behavior. At 25°C the viscosity vs concentration curve goes successively through a maximum and a minimum, while the viscosity vs temperature curve of the 10 wt% aqueous FC6HC4 solution goes through a marked maximum at 36°C [Tobita et al., Langmuir 13 (1997) 5054]. In an attempt to explain these properties the microstructure of aqueous solutions of FC6HC4 has been investigated by means of digital light microscopy, transmission electron microscopy at cryogenic temperature (cryo-TEM), rheology, and self-diffusion NMR. At 20°C, the increase of the FC6HC4 concentration was found to result in a progressive change of structure of the surfactant assemblies from mainly spherical micelles at 0.5 wt% to mainly cylindrical micelles at 10 wt%. At intermediate concentrations small disklike micelles and small complete and incomplete vesicles coexisting with cylindrical micelles were visualized. The occurrence of stretched cylindrical micelles is responsible for the effect of the surfactant concentration on the solution viscosity. Cryo-TEM, rheology, and self-diffusion NMR all suggest that an increase of the temperature brings about a growth of the assemblies present in the 10 wt% solution of FC6HC4. The structure of the assemblies present at the temperature where the viscosity is a maximum could not be elucidated by cryo-TEM because of the probable occurrence of an on-the-grid phase transformation, the result of blotting during specimen preparation. Nevertheless, the results show that the observed large assemblies break up at higher temperature to give rise to a more labile bicontinuous structure that consists of multiconnected disordered lamellae, with many folds and creases, and that may well be the L3 phase.

AB - The aqueous solutions of the anionic hybrid fluorocarbon/hydrocarbon surfactant sodium 1-oxo-1[4-(tridecafluorohexyl)phenyl]-2-hexanesulfate (FC6HC4) shows peculiar rheological behavior. At 25°C the viscosity vs concentration curve goes successively through a maximum and a minimum, while the viscosity vs temperature curve of the 10 wt% aqueous FC6HC4 solution goes through a marked maximum at 36°C [Tobita et al., Langmuir 13 (1997) 5054]. In an attempt to explain these properties the microstructure of aqueous solutions of FC6HC4 has been investigated by means of digital light microscopy, transmission electron microscopy at cryogenic temperature (cryo-TEM), rheology, and self-diffusion NMR. At 20°C, the increase of the FC6HC4 concentration was found to result in a progressive change of structure of the surfactant assemblies from mainly spherical micelles at 0.5 wt% to mainly cylindrical micelles at 10 wt%. At intermediate concentrations small disklike micelles and small complete and incomplete vesicles coexisting with cylindrical micelles were visualized. The occurrence of stretched cylindrical micelles is responsible for the effect of the surfactant concentration on the solution viscosity. Cryo-TEM, rheology, and self-diffusion NMR all suggest that an increase of the temperature brings about a growth of the assemblies present in the 10 wt% solution of FC6HC4. The structure of the assemblies present at the temperature where the viscosity is a maximum could not be elucidated by cryo-TEM because of the probable occurrence of an on-the-grid phase transformation, the result of blotting during specimen preparation. Nevertheless, the results show that the observed large assemblies break up at higher temperature to give rise to a more labile bicontinuous structure that consists of multiconnected disordered lamellae, with many folds and creases, and that may well be the L3 phase.

KW - Cryo-TEM

KW - Hybrid fluorinated surfactant

KW - L3 phase

KW - Lamellar phase

KW - Rheology

KW - Self-diffusion NMR

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JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

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Microstructures in the aqueous solutions of a hybrid anionic fluorocarbon/hydrocarbon surfactant

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