Field-induced clearing in sphere-sphere and rod-sphere binary mixtures of charged colloidal particles.
Phys Rev E Stat Nonlin Soft Matter Phys
; 79(6 Pt 1): 060401, 2009 Jun.
Article
en En
| MEDLINE
| ID: mdl-19658461
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.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Phys Rev E Stat Nonlin Soft Matter Phys
Asunto de la revista:
BIOFISICA
/
FISIOLOGIA
Año:
2009
Tipo del documento:
Article
País de afiliación:
Italia
Pais de publicación:
Estados Unidos