• Categoría: Artículo
  • Título: Multifractal detrended fluctuation analysis of intensity time series of photons scattered by tracer particles within a polymeric gel
  • Autor (es): Luciano Telesca, Catalina Haro-Pérez, L. Rebeca Moreno-Torres, Alejandro Ramirez-Rojas
  • Revista: Physica A
  • Volumen: 490
  • Páginas: 994
  • Formato: Enlace
  • Subido por: Catalina Ester

Multifractal detrended fluctuation analysis of intensity time series of photons scattered by tracer particles within a polymeric gel

Luciano Telesca, Catalina Haro-Pérez, L. Rebeca Moreno-Torres, Alejandro Ramirez-Rojas

Some properties of spatial confinement of tracer colloidal particles within polyacrylamide
dispersions are studied by means of the well-known dynamic light scattering (DLS) technique.
DLS allows obtaining sequences of elapsed times of scattered photons. In this
work, the aqueous polyacrylamide dispersion has no crosslinking and the volume fraction
occupied by the tracer particles is 0.02 %. Our experimental setup provides two sequences of
photons scattered by the same scattering volume that corresponds to two simultaneous experiments
(Channel A and Channel B). By integration of these sequences, the intensity time
series are obtained. We find that both channels are antipersistent with Hurst exponent,
H∼0.43 and 0.36, respectively. The antipersistence of the intensity time series indicates a
subdiffusive dynamics of the tracers in the polymeric network, which is in agreement with
the time dependence of the tracer’s mean square displacement.