Publication
Shear-induced defect formation in a nonionic lamellar phase
| dc.contributor.author | Medronho, B. | |
| dc.contributor.author | Rodrigues, M. | |
| dc.contributor.author | Miguel, M. G. | |
| dc.contributor.author | Olsson, U. | |
| dc.contributor.author | Schmidt, C. | |
| dc.date.accessioned | 2015-12-02T14:23:40Z | |
| dc.date.available | 2015-12-02T14:23:40Z | |
| dc.date.issued | 2010 | |
| dc.description.abstract | (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 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. | |
| dc.identifier.doi | https://dx.doi.org/10.1021/la100627z | |
| dc.identifier.issn | 0743-7463 | |
| dc.identifier.uri | http://hdl.handle.net/10400.1/7269 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | |
| dc.publisher | American Chemical Society | |
| dc.relation.isbasedon | P-003-4YD | |
| dc.title | Shear-induced defect formation in a nonionic lamellar phase | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 11313 | |
| oaire.citation.startPage | 11304 | |
| oaire.citation.title | Langmuir | |
| oaire.citation.volume | 26 | |
| person.familyName | Medronho | |
| person.givenName | Bruno | |
| person.identifier.ciencia-id | 6918-9AB3-8D22 | |
| person.identifier.orcid | 0000-0003-0972-1739 | |
| person.identifier.rid | P-5927-2014 | |
| person.identifier.scopus-author-id | 9940656700 | |
| rcaap.rights | restrictedAccess | |
| rcaap.type | article | |
| relation.isAuthorOfPublication | 4c03571a-93da-4504-8acf-c74326449852 | |
| relation.isAuthorOfPublication.latestForDiscovery | 4c03571a-93da-4504-8acf-c74326449852 |
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