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Threadlike Micelles from Cetyltrimethylammonium Bromide in Aqueous Sodium Naphthalenesulfonate Solutions Studied by Static and Dynamic Light Scattering

Brown, Wyn ; Johansson, Karin LU orcid and Almgren, Mats (1989) In The journal of physical chemistry 93(15). p.5888-5894
Abstract
Dynamic and static light scattering measurements have been made on both dilute and semidilute solutions of the threadlike micelles formed in equimolar mixtures of CTAB and sodium naphthalenesulfonate in aqueous solutions. In dilute solution (1 mM), the first normal mode of the chains (tj) was isolated from the contin decay time spectra as a function of measurement angle. The value of t¡ agreed with that estimated by the free-draining Zimm model. At higher, semidilute concentrations (C > 0.02 M) above which the solutions become viscoelastic, the decay time distribution is bimodal with well-separated
components on the time scale. The faster (q2-dependent) component reflects the cooperative motions of the transient network formed... (More)
Dynamic and static light scattering measurements have been made on both dilute and semidilute solutions of the threadlike micelles formed in equimolar mixtures of CTAB and sodium naphthalenesulfonate in aqueous solutions. In dilute solution (1 mM), the first normal mode of the chains (tj) was isolated from the contin decay time spectra as a function of measurement angle. The value of t¡ agreed with that estimated by the free-draining Zimm model. At higher, semidilute concentrations (C > 0.02 M) above which the solutions become viscoelastic, the decay time distribution is bimodal with well-separated
components on the time scale. The faster (q2-dependent) component reflects the cooperative motions of the transient network formed through interchain entanglements. The slow (q-independent) component of large amplitude apparently reflects the disruption/coalescence kinetics of the micellar aggregates, which are characterized by a strong positive concentration dependence of the measured relaxation rate (i.e., a relaxation time which decreased with increasing concentration of the CTAB/naphthalenesulfonate complex) and an activation energy of about 84 kJ-mol"1. (Less)
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author
; and
publishing date
type
Contribution to journal
publication status
published
subject
in
The journal of physical chemistry
volume
93
issue
15
pages
5888 - 5894
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:33845185228
ISSN
0022-3654
DOI
10.1021/j100352a047
language
English
LU publication?
no
id
474b1b7f-56b3-4d3e-aa26-06126ab8fcbd (old id 1737132)
date added to LUP
2016-04-01 17:14:00
date last changed
2021-06-13 06:05:52
@article{474b1b7f-56b3-4d3e-aa26-06126ab8fcbd,
  abstract     = {{Dynamic and static light scattering measurements have been made on both dilute and semidilute solutions of the threadlike micelles formed in equimolar mixtures of CTAB and sodium naphthalenesulfonate in aqueous solutions. In dilute solution (1 mM), the first normal mode of the chains (tj) was isolated from the contin decay time spectra as a function of measurement angle. The value of t¡ agreed with that estimated by the free-draining Zimm model. At higher, semidilute concentrations (C &gt; 0.02 M) above which the solutions become viscoelastic, the decay time distribution is bimodal with well-separated<br>
components on the time scale. The faster (q2-dependent) component reflects the cooperative motions of the transient network formed through interchain entanglements. The slow (q-independent) component of large amplitude apparently reflects the disruption/coalescence kinetics of the micellar aggregates, which are characterized by a strong positive concentration dependence of the measured relaxation rate (i.e., a relaxation time which decreased with increasing concentration of the CTAB/naphthalenesulfonate complex) and an activation energy of about 84 kJ-mol"1.}},
  author       = {{Brown, Wyn and Johansson, Karin and Almgren, Mats}},
  issn         = {{0022-3654}},
  language     = {{eng}},
  number       = {{15}},
  pages        = {{5888--5894}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{The journal of physical chemistry}},
  title        = {{Threadlike Micelles from Cetyltrimethylammonium Bromide in Aqueous Sodium Naphthalenesulfonate Solutions Studied by Static and Dynamic Light Scattering}},
  url          = {{http://dx.doi.org/10.1021/j100352a047}},
  doi          = {{10.1021/j100352a047}},
  volume       = {{93}},
  year         = {{1989}},
}