Brownian motion of optically anisotropic particles in weak polymer gels

P. Díaz-Le, va. , E. Pérez, J.L. Arauz-Lara


The translational and rotational dynamics of optically anisotropic colloidal particles in viscoelastic polymer gels is studied by dynamic light scattering. Polymer gels are formed by polymerization of acrylamide and bis-acrylamide, as cross-linking agent, in water. Particles with crystalline internal structure are made by emulsification of liquid crystal at the nematic phase and a further consolidation. In this work we consider only low fractions of cross-linking, where the systems are ergodic and gaussian statistics is valid. Experimental results for the rotational and translational mean squared displacements, showing the effect of the system's viscoelasticity on both diffusion modes, can be fitted to an extended model of Brownian particles harmonically bounded to a multicomponent of weak elastic restoring forces.


Dynamic light scattering,; rotational diffusion; gels

Full Text:



  • There are currently no refbacks.

REVISTA MEXICANA DE FÍSICA, year 67, issue 1, January-February 2021. Bimonthly Journal published by Sociedad Mexicana de Física, A. C. Departamento de Física, 2º Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Apartado Postal 70-348. Tel. (+52)55-5622-4946,, e-mail: Chief Editor: José Alejandro Ayala Mercado. INDAUTOR Certificate of Reserve: 04-2019-080216404400-203, ISSN: 2683-2224 (on line), 0035-001X (print), both granted by Instituto Nacional del Derecho de Autor. Responsible for the last update of this issue, Technical Staff of Sociedad Mexicana de Física, A. C., Fís. Efraín Garrido Román, 2º. Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Date of last modification, January 4, 2021.

The responsibility of the materials published in Revista Mexicana de Física rests solely with their authors and their content does not necessarily reflect the criteria of the Editorial Committee or the Sociedad Mexicana de Física. The total or partial reproduction of the texts hereby published is authorized as long as the complete source and the electronic address of the publications are cited.

There is no fee for article processing, submission or publication.

Revista Mexicana de Física by Sociedad Mexicana de Física, A. C. is distributed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License