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The cooling process effect on the bilayer phase state of the CTAC/cetearyl alcohol/water surfactant gel

Colafemmina, Giuseppe ; Palazzo, Gerardo ; Mateos, Helena ; Amin, Samiul ; Fameau, Anne Laure ; Olsson, Ulf LU and Gentile, Luigi (2020) In Colloids and Surfaces A: Physicochemical and Engineering Aspects 597.
Abstract

Gel formation by surfactant molecules is generally controlled by thermodynamics rather than kinetics. Mixtures of long-chain alcohols and surfactants are widely used in various cosmetic and pharmaceutical products. The cooling rate used to produce the products is known to be a key parameter to control the rheological properties and the final texture. However, the physical-chemistry links between the cooling process and the rheological properties are still unknown. Here, we investigated the mechanical properties and microstructure of a surfactant gel formulated with cetyltrimethylammonium chloride (CTAC) and cetearyl alcohol in water by using a multi-technique approach involving rheology, small-angle X-ray scattering (SAXS) and diffusion... (More)

Gel formation by surfactant molecules is generally controlled by thermodynamics rather than kinetics. Mixtures of long-chain alcohols and surfactants are widely used in various cosmetic and pharmaceutical products. The cooling rate used to produce the products is known to be a key parameter to control the rheological properties and the final texture. However, the physical-chemistry links between the cooling process and the rheological properties are still unknown. Here, we investigated the mechanical properties and microstructure of a surfactant gel formulated with cetyltrimethylammonium chloride (CTAC) and cetearyl alcohol in water by using a multi-technique approach involving rheology, small-angle X-ray scattering (SAXS) and diffusion NMR. The gels, formed by two cooling processes fast and slow cooling, respectively from a high-temperature mixture, have locally a lamellar structure with periodic repeat distances of 31.4 and 28.5 nm for fast and slow cooling, respectively. The cross-polarized microscopy images reveal the presence of multilamellar vesicles (MLVs). These data on the supramolecular aggregates allow rationalizing the mechanical behavior of the two samples. In fact, the elastic, G′, and the viscous, G′′, moduli were detected to be ca. 4 times higher for the fast-cooling (quenched) sample than for the slow-cooling (relaxed) sample.

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publication status
published
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in
Colloids and Surfaces A: Physicochemical and Engineering Aspects
volume
597
article number
124821
publisher
Elsevier
external identifiers
  • scopus:85083024688
ISSN
0927-7757
DOI
10.1016/j.colsurfa.2020.124821
language
English
LU publication?
yes
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f77f15b4-7ec8-4d2a-b5a9-ecce5835b83f
date added to LUP
2020-04-28 09:51:56
date last changed
2020-09-16 04:44:39
@article{f77f15b4-7ec8-4d2a-b5a9-ecce5835b83f,
  abstract     = {<p>Gel formation by surfactant molecules is generally controlled by thermodynamics rather than kinetics. Mixtures of long-chain alcohols and surfactants are widely used in various cosmetic and pharmaceutical products. The cooling rate used to produce the products is known to be a key parameter to control the rheological properties and the final texture. However, the physical-chemistry links between the cooling process and the rheological properties are still unknown. Here, we investigated the mechanical properties and microstructure of a surfactant gel formulated with cetyltrimethylammonium chloride (CTAC) and cetearyl alcohol in water by using a multi-technique approach involving rheology, small-angle X-ray scattering (SAXS) and diffusion NMR. The gels, formed by two cooling processes fast and slow cooling, respectively from a high-temperature mixture, have locally a lamellar structure with periodic repeat distances of 31.4 and 28.5 nm for fast and slow cooling, respectively. The cross-polarized microscopy images reveal the presence of multilamellar vesicles (MLVs). These data on the supramolecular aggregates allow rationalizing the mechanical behavior of the two samples. In fact, the elastic, G′, and the viscous, G′′, moduli were detected to be ca. 4 times higher for the fast-cooling (quenched) sample than for the slow-cooling (relaxed) sample.</p>},
  author       = {Colafemmina, Giuseppe and Palazzo, Gerardo and Mateos, Helena and Amin, Samiul and Fameau, Anne Laure and Olsson, Ulf and Gentile, Luigi},
  issn         = {0927-7757},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Colloids and Surfaces A: Physicochemical and Engineering Aspects},
  title        = {The cooling process effect on the bilayer phase state of the CTAC/cetearyl alcohol/water surfactant gel},
  url          = {http://dx.doi.org/10.1016/j.colsurfa.2020.124821},
  doi          = {10.1016/j.colsurfa.2020.124821},
  volume       = {597},
  year         = {2020},
}