Issue 16, 2011
From the journal:

Soft Matter

Scale-dependent diffusion of spheres in solutions of flexible and rigid polymers: mean square displacement and autocorrelation function for FCS and DLS measurements

Anna Ochab-Marcineka  and  Robert Hołyst*ab  

* Corresponding authors

a Institute of Physical Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, Warsaw, Poland
E-mail: holyst@ichf.edu.pl

b Cardinal Stefan Wyszyński University, WMP-SNŚ, ul. Dewajtis 5, Warsaw, Poland

Abstract

We present a theoretical description of diffusion of a sphere in polymer solution. The depletion layer around the sphere affects its motion and leads to scale-dependent diffusion. We propose the model of walking confined diffusion. Although it is different from anomalous diffusion, we show that the experimental data generated by this process may have features characteristic of anomalous diffusion. We give analytical formulas for the autocorrelation functions describing this type of motion in: i) dynamic light scattering experiments and ii) fluorescence correlation spectroscopy experiments. We compare our results to existing experimental data for polyethylene oxide, fd-virus, and F-actin solutions.

Graphical abstract: Scale-dependent diffusion of spheres in solutions of flexible and rigid polymers: mean square displacement and autocorrelation function for FCS and DLS measurements

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Article information

DOI
https://doi.org/10.1039/C1SM05217A
Article type
Paper
Submitted
10 Feb 2011
Accepted
04 May 2011
First published
13 Jul 2011

Soft Matter, 2011,7, 7366-7374

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Scale-dependent diffusion of spheres in solutions of flexible and rigid polymers: mean square displacement and autocorrelation function for FCS and DLS measurements

A. Ochab-Marcinek and R. Hołyst, Soft Matter, 2011, 7, 7366 DOI: 10.1039/C1SM05217A

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