Issue |
Europhys. Lett.
Volume 51, Number 6, September II 2000
|
|
---|---|---|
Page(s) | 608 - 613 | |
Section | Atomic and molecular physics | |
DOI | https://doi.org/10.1209/epl/i2000-00381-x | |
Published online | 01 September 2002 |
Slow plasmon modes in polymeric salt solutions
1
Max-Planck-Institut für Polymerforschung
Postfach 3148 - D-55021 Mainz, Germany
2
University Aboubakr Belkaid, Institute of
Physics - BP 119, Tlemcen 13 000, Algeria
3
Institut Charles Sadron - 6 rue Boussingault, F-67083
Strasbourg, France
4
Laboratoire Européen Associé, ICS - 6 rue Boussingault,
F-67083 Strasbourg, France
Corresponding author: vilgis@mpip-mainz.mpg.de
Received:
10
March
2000
Accepted:
28
July
2000
The dynamics of polymeric salt solutions are presented. The salt consists of
chains and
, which are chemically different and interact with
a Flory-interaction parameter χ, the
chain ends carry a
positive charge whereas the
chain ends are modified by negative
charges. The static structure factor shows a peak corresponding to a micro
phase separation. At low momentum transfer, the interdiffusion mode is
driven by electrostatics and is of the plasmon-type, but with an unusually
low frequency, easily accessible by experiments. This is due to the polymer
connectivity that introduces high friction and amplifies the charge
scattering thus allowing for low charge densities. The interdiffusion mode
shows a minimum (critical slowing-down) at finite k, when the interaction
parameter increases we find then a low k frequency quasi-plateau.
PACS: 36.20.-r – Macromolecules and polymer molecules / 65.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 73.20.Mf – Collective excitations (including plasmons and other charge-density excitations.)
© EDP Sciences, 2000
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