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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1021/la100627z
|2 doi
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|a eng
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|a Medronho, B
|e verfasserin
|4 aut
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|a Shear-induced defect formation in a nonionic lamellar phase
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|c 2010
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 30.09.2010
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|a Date Revised 30.06.2010
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a (2)H NMR experiments on a nonionic oriented lamellar phase demonstrate that shear flow induces structural defects in the lamellar structure. These substantial structural changes give rise to a transition from a viscous to a solidlike behavior; the elastic modulus of presheared samples was found to increase, reversibly, with the applied preshear rate. A similar behavior was found when step-cycling the temperature toward the layer-to-multilamellar-vesicle transition and back at constant shear rate. However, while shear rate controls the defect density, the temperature is found to control the defect rigidity. The lamellar phase exhibits a shear-thinning behavior under steady shear conditions, following the power law eta approximately gamma(n), with n approximately -0.4. Both the shear thinning and the elastic behavior are in agreement with the available theoretical models. The observed shear-induced structural defects are reversible and can be regarded as a pretransition prior to the shear-induced formation of multilamellar vesicles
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|a Journal Article
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|a Rodrigues, M
|e verfasserin
|4 aut
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1 |
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|a Miguel, M G
|e verfasserin
|4 aut
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1 |
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|a Olsson, U
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Schmidt, C
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1991
|g 26(2010), 13 vom: 06. Juli, Seite 11304-13
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|x 1520-5827
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|g volume:26
|g year:2010
|g number:13
|g day:06
|g month:07
|g pages:11304-13
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