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Colloidal Structure and Physical Properties of Gel Networks Containing Anionic Surfactant and Fatty Alcohol Mixture

Awad, Tarek LU ; Johnson, Eric S.; Bureiko, Andrei and Olsson, Ulf LU (2011) In Journal of Dispersion Science and Technology 32(6). p.807-815
Abstract
We investigated the mechanical properties, thermal behavior, physical state, and colloidal structure of a model gel network formulated with various ratios of sodium dodecyl sulfate polyacrylamide (SDS) and cetyl/stearyl fatty alcohol (FA) mixture in constant amounts of water (89%). The metastable gel, formed by slowly cooling stirred samples from temperatures above the chain melting temperature (Tm) of the long chain FA, has a lamellar structure with a periodic inter bilayer spacing of approximately 30nm. The bilayers remain homogeneous with SDS being immobilized in the FA matrix upon chain freezing. The chain length mismatch leads to an increased structural disorder among the alkyl chains upon SDS incorporation among the FA. As a result,... (More)
We investigated the mechanical properties, thermal behavior, physical state, and colloidal structure of a model gel network formulated with various ratios of sodium dodecyl sulfate polyacrylamide (SDS) and cetyl/stearyl fatty alcohol (FA) mixture in constant amounts of water (89%). The metastable gel, formed by slowly cooling stirred samples from temperatures above the chain melting temperature (Tm) of the long chain FA, has a lamellar structure with a periodic inter bilayer spacing of approximately 30nm. The bilayers remain homogeneous with SDS being immobilized in the FA matrix upon chain freezing. The chain length mismatch leads to an increased structural disorder among the alkyl chains upon SDS incorporation among the FA. As a result, the elastic modulus decreased with increasing SDS content. Conclusions were based on a large number of experiments involving differential scanning calorimetry, rheology, 1H NMR spectroscopy, and small angle x-ray scattering. Results from this work have uncovered the physical nature of these networks and gave insight into the role of anionic surfactants on the assembly, physical state, and mechanical properties of gel networks. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bilayer, cetyl, stearyl fatty alcohol, DSC, gel network, NMR, rheology, SDS, structure, x-ray
in
Journal of Dispersion Science and Technology
volume
32
issue
6
pages
807 - 815
publisher
Taylor & Francis
external identifiers
  • wos:000290988400006
  • scopus:79957571084
ISSN
0193-2691
DOI
10.1080/01932691.2010.488134
language
English
LU publication?
yes
id
83fd3230-c505-4fde-8b91-08034d121962 (old id 1985929)
date added to LUP
2011-07-06 11:02:18
date last changed
2017-01-01 05:21:34
@article{83fd3230-c505-4fde-8b91-08034d121962,
  abstract     = {We investigated the mechanical properties, thermal behavior, physical state, and colloidal structure of a model gel network formulated with various ratios of sodium dodecyl sulfate polyacrylamide (SDS) and cetyl/stearyl fatty alcohol (FA) mixture in constant amounts of water (89%). The metastable gel, formed by slowly cooling stirred samples from temperatures above the chain melting temperature (Tm) of the long chain FA, has a lamellar structure with a periodic inter bilayer spacing of approximately 30nm. The bilayers remain homogeneous with SDS being immobilized in the FA matrix upon chain freezing. The chain length mismatch leads to an increased structural disorder among the alkyl chains upon SDS incorporation among the FA. As a result, the elastic modulus decreased with increasing SDS content. Conclusions were based on a large number of experiments involving differential scanning calorimetry, rheology, 1H NMR spectroscopy, and small angle x-ray scattering. Results from this work have uncovered the physical nature of these networks and gave insight into the role of anionic surfactants on the assembly, physical state, and mechanical properties of gel networks.},
  author       = {Awad, Tarek and Johnson, Eric S. and Bureiko, Andrei and Olsson, Ulf},
  issn         = {0193-2691},
  keyword      = {Bilayer,cetyl,stearyl fatty alcohol,DSC,gel network,NMR,rheology,SDS,structure,x-ray},
  language     = {eng},
  number       = {6},
  pages        = {807--815},
  publisher    = {Taylor & Francis},
  series       = {Journal of Dispersion Science and Technology},
  title        = {Colloidal Structure and Physical Properties of Gel Networks Containing Anionic Surfactant and Fatty Alcohol Mixture},
  url          = {http://dx.doi.org/10.1080/01932691.2010.488134},
  volume       = {32},
  year         = {2011},
}