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Nondiffusive Brownian motion of deformable particles: breakdown of the "long-time tail"
Sándalo Roldán-Vargas1, Miguel Peláez-Fernández, Ramon Barnadas-Rodríguez
1Departamento de Física Aplicada, Grupo de Física de Fluidos y Biocoloides, Universidad de Granada, E-18071 Granada, Spain. sandalo@ugr.es
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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