Tuning the viscoelasticity of nonionic wormlike micelles with β-Cyclodextrin derivatives: A highly discriminative process

[EN]We report the influence of five β-cyclodextrin (β-CD) derivatives, namely: randomly methylated β-cyclodextrin (MBCD), heptakis (2,6-di-O-methyl)-β-cyclodextrin (DIMEB), heptakis (2,3,6-tri-O-methyl)-β-cyclodextrin (TRIMEB), 2-hydroxyethyl-β-cyclodextrin (HEBCD) and 2- hydroxypropyl-β-cyclodextri...

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Autores: da Silva, Marcelo A., Weinzaepfel, Evelyne, Afifi, Hala, Eriksson, Jonny, Grillo, Isabelle, Valero Juan, Margarita, Dreiss, Cécile A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:España
Institución:Universidad de Salamanca (USAL)
Repositorio:GREDOS. Repositorio Institucional de la Universidad de Salamanca
OAI Identifier:oai:dnet:gredos______::61c77531dcae557287169033aab08738
Acceso en línea:http://hdl.handle.net/10366/171003
Access Level:acceso abierto
Palabra clave:Cyclodextrins
Methylcyclodextrins
Hydroxyethylcyclodextrins
Hydroxypropylcyclodextrins Surfactants
Micelles
ciclodextrinas
micelas
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oai_identifier_str oai:dnet:gredos______::61c77531dcae557287169033aab08738
network_acronym_str ES
network_name_str España
spelling Tuning the viscoelasticity of nonionic wormlike micelles with β-Cyclodextrin derivatives: A highly discriminative process da Silva, Marcelo A. Weinzaepfel, Evelyne Afifi, Hala Eriksson, Jonny Grillo, Isabelle Valero Juan, Margarita Dreiss, Cécile A. Cyclodextrins Methylcyclodextrins Hydroxyethylcyclodextrins Hydroxypropylcyclodextrins Surfactants Micelles ciclodextrinas micelas [EN]We report the influence of five β-cyclodextrin (β-CD) derivatives, namely: randomly methylated β-cyclodextrin (MBCD), heptakis (2,6-di-O-methyl)-β-cyclodextrin (DIMEB), heptakis (2,3,6-tri-O-methyl)-β-cyclodextrin (TRIMEB), 2-hydroxyethyl-β-cyclodextrin (HEBCD) and 2- hydroxypropyl-β-cyclodextrin (HPBCD), on the self-assembly of mixtures of nonionic surfactants: polyoxyethylene cholesteryl ether (ChEO10) and monocaprylin (MCL). Mixtures of ChEO10/MCL in water form highly viscoelastic wormlike micelle solutions (WLM) over a range of concentrations; herein, the composition was fixed at 10 wt % ChEO10/3 wt % MCL. The addition of methylated β-CDs (MBCD, DIMEB, TRIMEB) induced a substantial disruption of the solid-like viscoelastic behavior, as shown from a loss of the Maxwell behavior, a large reduction in G′ and G″ in oscillatory frequency-sweep measurements, and a drop of the viscosity. The disruption increased with the degree of substitution, following: MBCD < DIMEB < TRIMEB. Cryo-TEM images confirmed a loss of the WLM networks, revealing short rods and disc-like aggregates, which were corroborated by small-angle neutron scattering (SANS) measurements. Critical aggregation concentrations (CAC), measured by fluorescence spectroscopy, increased in the presence of DIMEB for both ChEO10 and MCL, suggesting the existence of interactions between methylated β-CDs and both surfactants involved in WLM formation. Instead, hydroxyl-β-CDs had a very different effect on the WLM. HPBCD only slightly reduced the solid-like behavior, without suppressing it. Quite remarkably, the addition of HEBCD reinforced the solid-like characteristics and increased the viscosity 10-fold. Cryo-TEM images confirmed the subsistence of WLM in ChEO10/MCL/HEBCD solutions, while SANS data revealed a slight elongation and thickening of the worms, and an increase of associated water molecules. CAC data showed that HPBCD had little effect on either surfactant, while HEBCD strongly affected the CAC of MCL and only slightly affected the ChEO10. For both DIMEB and HEBCD, time-resolved SANS measurements showed that morphology changes underlying these macroscopic changes occur in less than 100 ms. American Chemical Society http://hdl.handle.net/10366/171003
title Tuning the viscoelasticity of nonionic wormlike micelles with β-Cyclodextrin derivatives: A highly discriminative process
spellingShingle Tuning the viscoelasticity of nonionic wormlike micelles with β-Cyclodextrin derivatives: A highly discriminative process
da Silva, Marcelo A.
Cyclodextrins
Methylcyclodextrins
Hydroxyethylcyclodextrins
Hydroxypropylcyclodextrins Surfactants
Micelles
ciclodextrinas
micelas
title_short Tuning the viscoelasticity of nonionic wormlike micelles with β-Cyclodextrin derivatives: A highly discriminative process
title_full Tuning the viscoelasticity of nonionic wormlike micelles with β-Cyclodextrin derivatives: A highly discriminative process
title_fullStr Tuning the viscoelasticity of nonionic wormlike micelles with β-Cyclodextrin derivatives: A highly discriminative process
title_full_unstemmed Tuning the viscoelasticity of nonionic wormlike micelles with β-Cyclodextrin derivatives: A highly discriminative process
title_sort Tuning the viscoelasticity of nonionic wormlike micelles with β-Cyclodextrin derivatives: A highly discriminative process
author da Silva, Marcelo A.
author_facet da Silva, Marcelo A.
Weinzaepfel, Evelyne
Afifi, Hala
Eriksson, Jonny
Grillo, Isabelle
Valero Juan, Margarita
Dreiss, Cécile A.
author_role author
author2 Weinzaepfel, Evelyne
Afifi, Hala
Eriksson, Jonny
Grillo, Isabelle
Valero Juan, Margarita
Dreiss, Cécile A.
author2_role author
author
author
author
author
author
topic Cyclodextrins
Methylcyclodextrins
Hydroxyethylcyclodextrins
Hydroxypropylcyclodextrins Surfactants
Micelles
ciclodextrinas
micelas
topic_facet Cyclodextrins
Methylcyclodextrins
Hydroxyethylcyclodextrins
Hydroxypropylcyclodextrins Surfactants
Micelles
ciclodextrinas
micelas
description [EN]We report the influence of five β-cyclodextrin (β-CD) derivatives, namely: randomly methylated β-cyclodextrin (MBCD), heptakis (2,6-di-O-methyl)-β-cyclodextrin (DIMEB), heptakis (2,3,6-tri-O-methyl)-β-cyclodextrin (TRIMEB), 2-hydroxyethyl-β-cyclodextrin (HEBCD) and 2- hydroxypropyl-β-cyclodextrin (HPBCD), on the self-assembly of mixtures of nonionic surfactants: polyoxyethylene cholesteryl ether (ChEO10) and monocaprylin (MCL). Mixtures of ChEO10/MCL in water form highly viscoelastic wormlike micelle solutions (WLM) over a range of concentrations; herein, the composition was fixed at 10 wt % ChEO10/3 wt % MCL. The addition of methylated β-CDs (MBCD, DIMEB, TRIMEB) induced a substantial disruption of the solid-like viscoelastic behavior, as shown from a loss of the Maxwell behavior, a large reduction in G′ and G″ in oscillatory frequency-sweep measurements, and a drop of the viscosity. The disruption increased with the degree of substitution, following: MBCD < DIMEB < TRIMEB. Cryo-TEM images confirmed a loss of the WLM networks, revealing short rods and disc-like aggregates, which were corroborated by small-angle neutron scattering (SANS) measurements. Critical aggregation concentrations (CAC), measured by fluorescence spectroscopy, increased in the presence of DIMEB for both ChEO10 and MCL, suggesting the existence of interactions between methylated β-CDs and both surfactants involved in WLM formation. Instead, hydroxyl-β-CDs had a very different effect on the WLM. HPBCD only slightly reduced the solid-like behavior, without suppressing it. Quite remarkably, the addition of HEBCD reinforced the solid-like characteristics and increased the viscosity 10-fold. Cryo-TEM images confirmed the subsistence of WLM in ChEO10/MCL/HEBCD solutions, while SANS data revealed a slight elongation and thickening of the worms, and an increase of associated water molecules. CAC data showed that HPBCD had little effect on either surfactant, while HEBCD strongly affected the CAC of MCL and only slightly affected the ChEO10. For both DIMEB and HEBCD, time-resolved SANS measurements showed that morphology changes underlying these macroscopic changes occur in less than 100 ms.
publishDate 2013
format article
status_str publishedVersion
url http://hdl.handle.net/10366/171003
eu_rights_str_mv openAccess
publisher American Chemical Society
institution Universidad de Salamanca (USAL)
collection GREDOS. Repositorio Institucional de la Universidad de Salamanca
reponame_str GREDOS. Repositorio Institucional de la Universidad de Salamanca
instname_str Universidad de Salamanca (USAL)
_version_ 1878442655057182720
publishDateSort 2013
author_browse Afifi, Hala
Dreiss, Cécile A.
Eriksson, Jonny
Grillo, Isabelle
Valero Juan, Margarita
Weinzaepfel, Evelyne
da Silva, Marcelo A.
publisherStr American Chemical Society
score 6,9303427

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