Frequency-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.
Bellini, T., Mantegazza, F., Degiorgio, V., Avallone, R., Saville, D. (1999). Electric polarizability of polyelectrolytes: Maxwell-Wagner and electrokinetic relaxation. PHYSICAL REVIEW LETTERS, 82(25), 5160-5163 [10.1103/PhysRevLett.82.5160].
Electric polarizability of polyelectrolytes: Maxwell-Wagner and electrokinetic relaxation
MANTEGAZZA, FRANCESCO;
1999
Abstract
Frequency-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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