Nondiffusive Brownian motion of deformable particles: Breakdown of the “long-time tail”

Sándalo Roldán-Vargas, Miguel Peláez-Fernández, Ramon Barnadas-Rodríguez, Manuel Quesada-Pérez, Joan Estelrich, and José Callejas-Fernández
Phys. Rev. E 80, 021403 – Published 18 August 2009

Abstract

We study the nondiffusive Brownian motion of both rigid and deformable mesoscopic particles by cross-correlated dynamic light scattering with microsecond temporal resolution. Whereas rigid particles show the classical long-time tail prediction, the transition to diffusive motion of deformable particles presents a striking behavior not explained by the existing hydrodynamic treatments. This observation can be interpreted in terms of a damped oscillatory deformational motion on time scales of the order of the Brownian time. Finally, we show that the nondiffusive Brownian motion depends on the specific flexibility of the particles.

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  • Received 22 December 2008

DOI:https://doi.org/10.1103/PhysRevE.80.021403

©2009 American Physical Society

Authors & Affiliations

Sándalo Roldán-Vargas1,*, Miguel Peláez-Fernández1, Ramon Barnadas-Rodríguez2,3, Manuel Quesada-Pérez4, Joan Estelrich2, and José Callejas-Fernández1

  • 1Departamento de Física Aplicada, Grupo de Física de Fluidos y Biocoloides, Universidad de Granada, E-18071 Granada, Spain
  • 2Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona, Barcelona, E-08028 Catalonia, Spain
  • 3Centre d’Estudis en Biofísica, Facultat de Medicina, Universitat Autònoma de Barcelona, Cerdanyola del Vallès Bellaterra, Barcelona, E-08193 Catalonia, Spain
  • 4Departamento de Física, Escuela Politécnica Superior de Linares, Universidad de Jaén, Linares, E-23700 Jaén, Spain

  • *Corresponding author. sandalo@ugr.es

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Issue

Vol. 80, Iss. 2 — August 2009

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