Decoupling of translational and rotational diffusion in quasi-2D colloidal fluids.
J Chem Phys
; 147(13): 134502, 2017 Oct 07.
Article
en En
| MEDLINE
| ID: mdl-28987111
ABSTRACT
We observe the translational and rotational diffusion of dimer tracer particles in quasi-2D colloidal samples. The dimers are in dense samples of two different sizes of spherical colloidal particles, with the area fraction Ï of the particles varying from dilute to nearly glassy. At low Ï, rotational and translational diffusion have a ratio set by the dimer size, as expected. At higher Ï, dimers become caged by their neighboring particles, and both rotational and translational diffusion become slow. For short dimers, we observe rapid reorientations so that the rotational diffusion is faster than the translational diffusion the two modes of diffusion are decoupled and have different Ï dependence. Longer dimers do not exhibit fast rotations, and we find that their translational and rotational diffusion stay coupled for all Ï. Our results bridge prior results that used spheres (very fast rotation) and long ellipsoids (very slow rotation).
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1
Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
J Chem Phys
Año:
2017
Tipo del documento:
Article
País de afiliación:
Estados Unidos