Electric Polarizability of Polyelectrolytes: Maxwell-Wagner and Electrokinetic Relaxation
1999; American Physical Society; Volume: 82; Issue: 25 Linguagem: Inglês
10.1103/physrevlett.82.5160
ISSN1092-0145
AutoresTommaso Bellini, Francesco Mantegazza, Vittorio Degiorgio, Roberto Avallone, D. A. Saville,
Tópico(s)Microfluidic and Bio-sensing Technologies
ResumoFrequency-resolved electric birefringence experiments are carried out on dilute colloidal suspensions of charged, rodlike particles over a wide frequency range. The Kerr constant displays new relaxation features impossible to identify with dielectric spectroscopy. Our data provide the first explicit evidence of Maxwell-Wagner relaxation of the electric polarizability of charged colloids. We successfully explain the observed behavior with a model combining electrokinetic and Maxwell-Wagner approaches. Our particles behave as constant charge entities.
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