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Tail unsaturation tailors the thermodynamics and rheology of a self-assembled sugar-based surfactant

Larsson, Johan LU ; Leung, Anna E. ; Lang, Christian ; Wu, Baohu ; Wahlgren, Marie LU orcid ; Nylander, Tommy LU ; Ulvenlund, Stefan LU and Sanchez-Fernandez, Adrian LU orcid (2021) In Journal of Colloid and Interface Science 585. p.178-183
Abstract

Hypothesis: The self-assembly of long-tail surfactants results in the formation of nanoscale structures, e.g. worm-like micelles, with the ability to modify the rheology of the system. However, micelle formation, and thus the alteration of the rheology, is subject to the high Krafft temperature of saturated long-tail surfactants. Hexadecylmaltosides are sustainable surfactants that, in solution, form tailorable viscoelastic fluids. The preparation of monounsaturated sugar-based surfactants is hypothesised to reduce the Krafft point compared to the saturated analogues, therefore increasing the temperature range where the surfactant remains in the micellar form.

Experiments: Here we report the synthesis and... (More)

Hypothesis: The self-assembly of long-tail surfactants results in the formation of nanoscale structures, e.g. worm-like micelles, with the ability to modify the rheology of the system. However, micelle formation, and thus the alteration of the rheology, is subject to the high Krafft temperature of saturated long-tail surfactants. Hexadecylmaltosides are sustainable surfactants that, in solution, form tailorable viscoelastic fluids. The preparation of monounsaturated sugar-based surfactants is hypothesised to reduce the Krafft point compared to the saturated analogues, therefore increasing the temperature range where the surfactant remains in the micellar form.

Experiments: Here we report the synthesis and characterisation of a novel sugar-based surfactant with an unsaturated C16-tail, namely palmitoleyl-β-D-maltoside (β-C16-1G2). Differential scanning calorimetry was used to probe the temperature stability of the system. The rheology of β-C16-1G2 solutions was investigated by means of rotational and oscillatory rheology, and these results were connected to the mesoscopic structure of the system as shown by small-angle neutron and X-ray scattering, and dynamic light scattering.

Findings: The presence of a double bond on the alkyl chain moiety leads to a depression in the Krafft point, allowing the surfactant to form a thermodynamically stable micellar solution over a wide range of temperatures, i.e. 5–95 °C. The surfactant self-assembles into worm-like micelles which, upon entanglement in the semi-dilute regime, result in the formation of a non-Newtonian, viscoelastic fluid. These observations have important implications in the development of new sustainable formulated products, enabling the preparation of surfactant phases with remarkable thermal resilience.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Small-angle scattering, Sugar-based surfactant, Unsaturated surfactant, Viscoelastic fluid, Worm-like micelle
in
Journal of Colloid and Interface Science
volume
585
pages
6 pages
publisher
Elsevier
external identifiers
  • pmid:33279700
  • scopus:85097636616
ISSN
0021-9797
DOI
10.1016/j.jcis.2020.11.063
language
English
LU publication?
yes
id
3b91b283-326b-498e-abd4-fdd4cc94ded4
date added to LUP
2020-12-30 17:05:18
date last changed
2024-04-17 22:04:38
@article{3b91b283-326b-498e-abd4-fdd4cc94ded4,
  abstract     = {{<p><i>Hypothesis</i>: The self-assembly of long-tail surfactants results in the formation of nanoscale structures, e.g. worm-like micelles, with the ability to modify the rheology of the system. However, micelle formation, and thus the alteration of the rheology, is subject to the high Krafft temperature of saturated long-tail surfactants. Hexadecylmaltosides are sustainable surfactants that, in solution, form tailorable viscoelastic fluids. The preparation of monounsaturated sugar-based surfactants is hypothesised to reduce the Krafft point compared to the saturated analogues, therefore increasing the temperature range where the surfactant remains in the micellar form.</p><p><i>Experiments</i>: Here we report the synthesis and characterisation of a novel sugar-based surfactant with an unsaturated C16-tail, namely palmitoleyl-β-D-maltoside (β-C<sub>16-1</sub>G<sub>2</sub>). Differential scanning calorimetry was used to probe the temperature stability of the system. The rheology of β-C<sub>16-1</sub>G<sub>2</sub> solutions was investigated by means of rotational and oscillatory rheology, and these results were connected to the mesoscopic structure of the system as shown by small-angle neutron and X-ray scattering, and dynamic light scattering.</p><p> <i>Findings</i>: The presence of a double bond on the alkyl chain moiety leads to a depression in the Krafft point, allowing the surfactant to form a thermodynamically stable micellar solution over a wide range of temperatures, i.e. 5–95 °C. The surfactant self-assembles into worm-like micelles which, upon entanglement in the semi-dilute regime, result in the formation of a non-Newtonian, viscoelastic fluid. These observations have important implications in the development of new sustainable formulated products, enabling the preparation of surfactant phases with remarkable thermal resilience.</p>}},
  author       = {{Larsson, Johan and Leung, Anna E. and Lang, Christian and Wu, Baohu and Wahlgren, Marie and Nylander, Tommy and Ulvenlund, Stefan and Sanchez-Fernandez, Adrian}},
  issn         = {{0021-9797}},
  keywords     = {{Small-angle scattering; Sugar-based surfactant; Unsaturated surfactant; Viscoelastic fluid; Worm-like micelle}},
  language     = {{eng}},
  pages        = {{178--183}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Colloid and Interface Science}},
  title        = {{Tail unsaturation tailors the thermodynamics and rheology of a self-assembled sugar-based surfactant}},
  url          = {{http://dx.doi.org/10.1016/j.jcis.2020.11.063}},
  doi          = {{10.1016/j.jcis.2020.11.063}},
  volume       = {{585}},
  year         = {{2021}},
}