Journal
EUROPEAN PHYSICAL JOURNAL E
Volume 30, Issue 4, Pages 411-415Publisher
SPRINGER
DOI: 10.1140/epje/i2009-10540-5
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The low-field transverse polarizability of the counterions condensed on an isolated charged rod is small. We show that it can be much larger if the rod is a member of an assembly of aligned rods. The polarization free energy of the assembly of rods in a transverse field is then similar to its polarization free energy in a field parallel to the rods. The polarization free energy of the assembly in a transverse field becomes lower than in a parallel field if the extent of the assembly (as measured, for example, by the diameter of a cylindrical assembly) is larger than the length of the individual rods. We suggest that this model may provide a reasonable explanation for the occurrence of anomalous birefringence in systems of interacting charged rodlike particles.
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