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Following micelles with rheo-NMR

2011-09Conference object Restricted access
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dc.contributor.authorAlmeida, Pedro L.
dc.contributor.authorFeio, G.
dc.contributor.authorPereira, M.
dc.contributor.authorScheven, U.
dc.contributor.authorR. Leal, Catarina
dc.date.accessioned2020-11-17T14:21:54Z
dc.date.available2020-11-17T14:21:54Z
dc.date.issued2011-09
dc.description.abstractThe rheological behaviour of the micellar system Cetyltrimethylammonium Bromide (CTAB)/Sodium Salicylate (NaSal) in water is highly dependent on the components concentration and temperature. The surfactant CTAB forms spherical micelles in water above a certain concentration (CD), which upon addition of a salt (NaSal) elongate to form entangled wormlike structures, also known as “living polymers”. The viscosity of wormlike micelles solutions increases dramatically with the increase of salt concentration (CS), changing from quasi-newtonian to a viscoelastic behaviour in the gel-like, highly entangled state. Such rich rheological behaviour has already been characterized by some of the authors and in the literature, e.g., [1-3]. The rheological behaviour of CTAB/NaSal aqueous solutions in the regime CD/Cs>1 are presented in this work. Furthermore, we followed the rheological behaviour of these solutions by a rheo-NMR technique, allowing for an insight of “what happens” inside the sample during the application of a shear flow. To achieve this goal we performed quantitative flow rate measurements using velocity NMR mapping in the rheo-NMR experiments, developed by Callaghan [4]. Attempts to characterize the velocity profile in this system has already been described [5] using an optical-shear flow experimental setup, although for solutions with CD/Cs<1, where the surfactant [CTAB] has always a smaller concentration than the salt [NaSal].pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationPORTELA, Raquel; [et al] – Following micelles with rheo-NMR. In 3rd Iberian Meeting on Rheology – Rheology Trends: From Nano to Macro Systems (IBEREO 2011). Costa da Caparica, Portugal. Pp. 277-280pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.21/12382
dc.language.isoengpt_PT
dc.subjectMicellarpt_PT
dc.subjectRheo-NMRpt_PT
dc.titleFollowing micelles with rheo-NMRpt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceSeptember 7-9, 2011 – Costa da Caparica, Portugalpt_PT
oaire.citation.endPage280pt_PT
oaire.citation.startPage277pt_PT
oaire.citation.title3rd Iberian Meeting on Rheology – Rheology Trends: From Nano to Macro Systems (IBEREO 2011)pt_PT
person.familyNameMarques de Almeida
person.familyNameMarques Mendes Almeida da Rosa Leal
person.givenNamePedro
person.givenNameCatarina
person.identifierA-2814-2009
person.identifier.ciencia-id0218-71B2-2DE0
person.identifier.ciencia-idAF15-486E-BB15
person.identifier.orcid0000-0001-7356-8455
person.identifier.orcid0000-0001-5871-4936
person.identifier.ridB-4356-2009
person.identifier.scopus-author-id57190384213
person.identifier.scopus-author-id7005379280
rcaap.rightsclosedAccesspt_PT
rcaap.typeconferenceObjectpt_PT
relation.isAuthorOfPublication429b6d71-328e-42b3-8151-15493de249b8
relation.isAuthorOfPublication4db8990d-5eb1-4515-ae7a-68873cf776a5
relation.isAuthorOfPublication.latestForDiscovery4db8990d-5eb1-4515-ae7a-68873cf776a5

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