Shear-Induced Defect Formation in a Nonionic Lamellar Phase
(2010) In Langmuir 26(13). p.11304-11313- Abstract
- H-2 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 similar to gamma(n),... (More)
- H-2 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 similar to gamma(n), with n approximate to -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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1629015
- author
- Medronho, Bruno LU ; Rodrigues, M. ; Miguel, M. G. ; Olsson, Ulf LU and Schmidt, C.
- organization
- publishing date
- 2010
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Langmuir
- volume
- 26
- issue
- 13
- pages
- 11304 - 11313
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000279239900122
- scopus:77954292464
- pmid:20373778
- ISSN
- 0743-7463
- DOI
- 10.1021/la100627z
- language
- English
- LU publication?
- yes
- id
- 2980d920-5dad-4d69-bed0-cdfc0dbd8641 (old id 1629015)
- date added to LUP
- 2016-04-01 10:08:37
- date last changed
- 2022-01-25 20:08:38
@article{2980d920-5dad-4d69-bed0-cdfc0dbd8641,
abstract = {{H-2 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 similar to gamma(n), with n approximate to -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.}},
author = {{Medronho, Bruno and Rodrigues, M. and Miguel, M. G. and Olsson, Ulf and Schmidt, C.}},
issn = {{0743-7463}},
language = {{eng}},
number = {{13}},
pages = {{11304--11313}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Langmuir}},
title = {{Shear-Induced Defect Formation in a Nonionic Lamellar Phase}},
url = {{http://dx.doi.org/10.1021/la100627z}},
doi = {{10.1021/la100627z}},
volume = {{26}},
year = {{2010}},
}