Nondiffusive Brownian motion of deformable particles: breakdown of the "long-time tail".
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.
Departamento de Física Aplicada, Grupo de Física de Fluidos y Biocoloides, Universidad de Granada, E-18071 Granada, Spain. sandalo@ugr.es
Sándalo
S
Roldán-Vargas
Miguel
M
Peláez-Fernández
Ramon
R
Barnadas-Rodríguez
Manuel
M
Quesada-Pérez
Joan
J
Estelrich
José
J
Callejas-Fernández