New considerations on the role of covalency in ferroelectric niobates and tantalates |
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Authors: | A Villesuzanne C Elissalde M Pouchard J Ravez |
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Institution: | (1) Laboratoire de Physico-Chimie Théorique, ESA CNRS 7083, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05, France, FR |
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Abstract: | We consider the interaction of an homogeneous polyelectrolyte with an obstacle during electrophoretic drift. We explicitly
take into account the hydrodynamic interactions generated by this mechanical trapping, and we evaluate their influence on
the unhooking process. Important qualitative effects are pointed out in low and moderate field regimes. However, numerical
simulations indicate that, in strong field, the existing simpler local force models, which neglect these hydrodynamic interactions,
are quantitatively acceptable.
Received: 18 March 1998 / Received in final form and accepted: 20 May 1998 |
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Keywords: | PACS 87 15 He Molecular dynamics and conformational changes - 82 45 +z Electrochemistry and electrophoresis - 36 20 -r Macromolecules and polymer molecules |
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