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Shear-induced nanostructural changes in micelles formed by sugar-based surfactants with varied anomeric configuration

Larsson, Johan LU ; Williams, Ashley P. ; Wahlgren, Marie LU orcid ; Porcar, Lionel ; Ulvenlund, Stefan LU ; Nylander, Tommy LU ; Tabor, Rico F. and Sanchez-Fernandez, Adrian LU orcid (2022) In Journal of Colloid and Interface Science 606. p.328-336
Abstract

Hypothesis: The self-assembly of long tail sugar-based surfactants into worm-like micelles has recently been demonstrated, and the rheological properties of such systems have been shown to be tuneable through subtle modifications of the molecular characteristics of the surfactant monomer. In particular, the anomeric configuration of the hexadecylmaltoside headgroup was shown to induce profound changes in the nanostructure and rheology of the system. The origin of such changes is hypothesised to arise from differences in the structure and relaxation of the micellar networks in the semi-dilute regime. Experiments: Here we explore the molecular background to the flow properties of the two anomers of hexadecylmaltoside (α- and... (More)

Hypothesis: The self-assembly of long tail sugar-based surfactants into worm-like micelles has recently been demonstrated, and the rheological properties of such systems have been shown to be tuneable through subtle modifications of the molecular characteristics of the surfactant monomer. In particular, the anomeric configuration of the hexadecylmaltoside headgroup was shown to induce profound changes in the nanostructure and rheology of the system. The origin of such changes is hypothesised to arise from differences in the structure and relaxation of the micellar networks in the semi-dilute regime. Experiments: Here we explore the molecular background to the flow properties of the two anomers of hexadecylmaltoside (α- and β-C16G2) by directly connecting their rheological behaviour to the micelle morphology. For this purpose, 1–3 plane rheo-small-angle neutron scattering measurements, using a Couette cell geometry, probed the structural changes in the micellar phase under shear. The effect of surfactant anomeric configuration, surfactant concentration, temperature and mixing ratio of the two anomers were investigated. The static micelle structure in the semi-dilute regime was determined using the polymer reference interaction site model. Findings: The segmental alignment of the micellar phase was studied under several flow conditions, showing that the shear-thinning behaviour relates to the re-arrangement of β-C16G2 worm-like micelles, whilst shorter α-C16G2 micelles are considerably less affected by the flow. The results are rationalised in terms of micelle alignment and disruption of the entangled network, providing a detailed mechanism by which sugar-based surfactants control the rheology of the fluid. To further enable future studies, we provide the complete code for modelling micelle structure in the semi-dilute regime using the polymer reference interaction site model.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Rheology, Shear-thinning, Small-angle neutron scattering, Sugar-based surfactants, Sustainable surfactants, Worm-like micelles
in
Journal of Colloid and Interface Science
volume
606
pages
9 pages
publisher
Elsevier
external identifiers
  • pmid:34392029
  • scopus:85112375461
ISSN
0021-9797
DOI
10.1016/j.jcis.2021.08.007
language
English
LU publication?
yes
id
a296ae61-0bf6-4a09-aec3-5e0f465c34ca
date added to LUP
2021-09-03 11:23:30
date last changed
2024-05-19 12:46:19
@article{a296ae61-0bf6-4a09-aec3-5e0f465c34ca,
  abstract     = {{<p>Hypothesis: The self-assembly of long tail sugar-based surfactants into worm-like micelles has recently been demonstrated, and the rheological properties of such systems have been shown to be tuneable through subtle modifications of the molecular characteristics of the surfactant monomer. In particular, the anomeric configuration of the hexadecylmaltoside headgroup was shown to induce profound changes in the nanostructure and rheology of the system. The origin of such changes is hypothesised to arise from differences in the structure and relaxation of the micellar networks in the semi-dilute regime. Experiments: Here we explore the molecular background to the flow properties of the two anomers of hexadecylmaltoside (α- and β-C<sub>16</sub>G<sub>2</sub>) by directly connecting their rheological behaviour to the micelle morphology. For this purpose, 1–3 plane rheo-small-angle neutron scattering measurements, using a Couette cell geometry, probed the structural changes in the micellar phase under shear. The effect of surfactant anomeric configuration, surfactant concentration, temperature and mixing ratio of the two anomers were investigated. The static micelle structure in the semi-dilute regime was determined using the polymer reference interaction site model. Findings: The segmental alignment of the micellar phase was studied under several flow conditions, showing that the shear-thinning behaviour relates to the re-arrangement of β-C<sub>16</sub>G<sub>2</sub> worm-like micelles, whilst shorter α-C<sub>16</sub>G<sub>2</sub> micelles are considerably less affected by the flow. The results are rationalised in terms of micelle alignment and disruption of the entangled network, providing a detailed mechanism by which sugar-based surfactants control the rheology of the fluid. To further enable future studies, we provide the complete code for modelling micelle structure in the semi-dilute regime using the polymer reference interaction site model.</p>}},
  author       = {{Larsson, Johan and Williams, Ashley P. and Wahlgren, Marie and Porcar, Lionel and Ulvenlund, Stefan and Nylander, Tommy and Tabor, Rico F. and Sanchez-Fernandez, Adrian}},
  issn         = {{0021-9797}},
  keywords     = {{Rheology; Shear-thinning; Small-angle neutron scattering; Sugar-based surfactants; Sustainable surfactants; Worm-like micelles}},
  language     = {{eng}},
  month        = {{01}},
  pages        = {{328--336}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Colloid and Interface Science}},
  title        = {{Shear-induced nanostructural changes in micelles formed by sugar-based surfactants with varied anomeric configuration}},
  url          = {{http://dx.doi.org/10.1016/j.jcis.2021.08.007}},
  doi          = {{10.1016/j.jcis.2021.08.007}},
  volume       = {{606}},
  year         = {{2022}},
}