Size dependence of the propulsion velocity for catalytic Janus-sphere swimmers.
Phys Rev E Stat Nonlin Soft Matter Phys
; 85(2 Pt 1): 020401, 2012 Feb.
Article
em En
| MEDLINE
| ID: mdl-22463141
ABSTRACT
The propulsion velocity of active colloids that asymmetrically catalyze a chemical reaction is probed experimentally as a function of their sizes. It is found that over the experimentally accessible range, the velocity decays as a function of size, with a rate that is compatible with an inverse size dependence. A diffusion-reaction model for the concentrations of the fuel and waste molecules that takes into account a two-step process for the asymmetric catalytic activity on the surface of the colloid is shown to predict a similar behavior for colloids at the large size limit, with a saturation for smaller sizes.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Coloides
/
Modelos Químicos
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Phys Rev E Stat Nonlin Soft Matter Phys
Ano de publicação:
2012
Tipo de documento:
Article