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Relaxation kinetics of an L-3 (sponge) phase

Le, Thao LU ; Olsson, Ulf LU ; Wennerström, Håkan LU ; Uhrmeister, P; Rathke, B and Strey, R (2002) In The Journal of Physical Chemistry Part B 106(36). p.9410-9417
Abstract
The kinetic response of an L-3 (sponge) phase formed in the C12E5-n-decane-brine system is studied using the Joule-heating temperature jump (JHTJ) technique. The equilibrium state of the spongelike membrane is instantaneously perturbed, and the kinetic response is monitored using a multi-angle light scattering setup. These measurements yield a time-dependent scattering intensity as a function of temperature, scattering vector q, and concentration. We observed a single-exponential relaxation characteristic time, tau(m). The q dependence of the scattering amplitude shows an Omstein-Zernike behavior, but we can identify two concentration regimes with respect to the relaxation behavior. For volume fractions Phi(m) = 0.20, there is no... (More)
The kinetic response of an L-3 (sponge) phase formed in the C12E5-n-decane-brine system is studied using the Joule-heating temperature jump (JHTJ) technique. The equilibrium state of the spongelike membrane is instantaneously perturbed, and the kinetic response is monitored using a multi-angle light scattering setup. These measurements yield a time-dependent scattering intensity as a function of temperature, scattering vector q, and concentration. We observed a single-exponential relaxation characteristic time, tau(m). The q dependence of the scattering amplitude shows an Omstein-Zernike behavior, but we can identify two concentration regimes with respect to the relaxation behavior. For volume fractions Phi(m) = 0.20, there is no detectable q dependence of the relaxation times, while for samples with Phi(m) > 0.30, the relaxation times display the q(-2) dependence typical of a diffusive process and with relaxation times consistent with those found in dynamic light scattering. At the intermediate concentrations, there is a transition from the q-independent to the q(-2) dependence behavior. Analysis from each concentration regime reveals distinct differences in the dependence of tau(m) on temperature and concentration, with an extraordinarily strong concentration dependence of tau(m) (tau(m) approximate to Phi(-9)) in the low concentration regime and a temperature dependence corresponding to a formal Arrhenius activation energy of 720 kJ/mol or 275 kT. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
106
issue
36
pages
9410 - 9417
publisher
The American Chemical Society
external identifiers
  • wos:000177876900033
  • scopus:0037068423
ISSN
1520-5207
DOI
10.1021/jp020186j
language
English
LU publication?
yes
id
3d478d05-5211-4086-91c2-2ea0ceada144 (old id 329100)
date added to LUP
2007-11-14 12:44:20
date last changed
2017-08-13 04:31:16
@article{3d478d05-5211-4086-91c2-2ea0ceada144,
  abstract     = {The kinetic response of an L-3 (sponge) phase formed in the C12E5-n-decane-brine system is studied using the Joule-heating temperature jump (JHTJ) technique. The equilibrium state of the spongelike membrane is instantaneously perturbed, and the kinetic response is monitored using a multi-angle light scattering setup. These measurements yield a time-dependent scattering intensity as a function of temperature, scattering vector q, and concentration. We observed a single-exponential relaxation characteristic time, tau(m). The q dependence of the scattering amplitude shows an Omstein-Zernike behavior, but we can identify two concentration regimes with respect to the relaxation behavior. For volume fractions Phi(m) = 0.20, there is no detectable q dependence of the relaxation times, while for samples with Phi(m) > 0.30, the relaxation times display the q(-2) dependence typical of a diffusive process and with relaxation times consistent with those found in dynamic light scattering. At the intermediate concentrations, there is a transition from the q-independent to the q(-2) dependence behavior. Analysis from each concentration regime reveals distinct differences in the dependence of tau(m) on temperature and concentration, with an extraordinarily strong concentration dependence of tau(m) (tau(m) approximate to Phi(-9)) in the low concentration regime and a temperature dependence corresponding to a formal Arrhenius activation energy of 720 kJ/mol or 275 kT.},
  author       = {Le, Thao and Olsson, Ulf and Wennerström, Håkan and Uhrmeister, P and Rathke, B and Strey, R},
  issn         = {1520-5207},
  language     = {eng},
  number       = {36},
  pages        = {9410--9417},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Relaxation kinetics of an L-3 (sponge) phase},
  url          = {http://dx.doi.org/10.1021/jp020186j},
  volume       = {106},
  year         = {2002},
}