Binary mixtures of larger and smaller colloids having charges of equal sign display unusual response to low-frequency electric fields. We show here that the previously reported negative torque acting on rodlike particles when in presence of a sea of smaller particles is accompanied by a field-induced clearing of the suspension. Measurements of transmitted intensity performed on mixtures of large (dilute) and small (semidilute) spherical particles indicate that such a clearing effect is universal and due to an anisotropic E2 -dependent redistribution of the small spheres around the large ones. We interpret this behavior as resulting from O (E2) electro-osmotic flows whose magnitude is greatly enhanced by the presence of the small particles. © 2009 The American Physical Society.

Fornasari, L., Mantegazza, F., Jimenez, M., Buscaglia, M., Bellini, T. (2009). Field-induced clearing in sphere-sphere and rod-sphere binary mixtures of charged colloidal particles. PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS, 79(6) [10.1103/PhysRevE.79.060401].

Field-induced clearing in sphere-sphere and rod-sphere binary mixtures of charged colloidal particles

MANTEGAZZA, FRANCESCO;
2009

Abstract

Binary mixtures of larger and smaller colloids having charges of equal sign display unusual response to low-frequency electric fields. We show here that the previously reported negative torque acting on rodlike particles when in presence of a sea of smaller particles is accompanied by a field-induced clearing of the suspension. Measurements of transmitted intensity performed on mixtures of large (dilute) and small (semidilute) spherical particles indicate that such a clearing effect is universal and due to an anisotropic E2 -dependent redistribution of the small spheres around the large ones. We interpret this behavior as resulting from O (E2) electro-osmotic flows whose magnitude is greatly enhanced by the presence of the small particles. © 2009 The American Physical Society.
Articolo in rivista - Articolo scientifico
82.70.Dd; 47.57.jd
English
Fornasari, L., Mantegazza, F., Jimenez, M., Buscaglia, M., Bellini, T. (2009). Field-induced clearing in sphere-sphere and rod-sphere binary mixtures of charged colloidal particles. PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS, 79(6) [10.1103/PhysRevE.79.060401].
Fornasari, L; Mantegazza, F; Jimenez, M; Buscaglia, M; Bellini, T
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/6238
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