Relative distance between tracers as a measure of diffusivity within moving aggregates

Journal article


Publication Details

Author(s): Poenisch W, Zaburdaev V
Journal: European Physical Journal B
Publisher: SPRINGER
Publication year: 2018
Volume: 91
Journal issue: 2
ISSN: 1434-6028


Abstract

Tracking of particles, be it a passive tracer or an actively moving bacterium in the growing bacterial colony, is a powerful technique to probe the physical properties of the environment of the particles. One of the most common measures of particle motion driven by fluctuations and random forces is its diffusivity, which is routinely obtained by measuring the mean squared displacement of the particles. However, often the tracer particles may be moving in a domain or an aggregate which itself experiences some regular or random motion and thus masks the diffusivity of tracers. Here we provide a method for assessing the diffusivity of tracer particles within mobile aggregates by measuring the so-called mean squared relative distance (MSRD) between two tracers. We provide analytical expressions for both the ensemble and time averaged MSRD allowing for direct identification of diffusivities from experimental data.


Additional Organisation
Lehrstuhl für Mathematik in den Lebenswissenschaften


External institutions with authors

Max-Planck-Institut für Physik komplexer Systeme (MPI PKS) / Max Planck Institute for the Physics of Complex Systems


How to cite

APA:
Poenisch, W., & Zaburdaev, V. (2018). Relative distance between tracers as a measure of diffusivity within moving aggregates. European Physical Journal B, 91(2). https://dx.doi.org/10.1140/epjb/e2017-80347-5

MLA:
Poenisch, Wolfram, and Vasily Zaburdaev. "Relative distance between tracers as a measure of diffusivity within moving aggregates." European Physical Journal B 91.2 (2018).

BibTeX: 

Last updated on 2019-07-02 at 13:08