CROSS-CORRELATIONS IN THE BROWNIAN MOTION OF COLLOIDAL NANOPARTICLES

Authors

  • Sz. KELEMEN Babeş-Bolyai University, Faculty of Physics, 1 Kogălniceanu str., 400084 Cluj-Napoca, Romania
  • L. VARGA Babeş-Bolyai University, Faculty of Physics, 1 Kogălniceanu str., 400084 Cluj-Napoca, Romania
  • Z. NÉDA Babeş-Bolyai University, Faculty of Physics, 1 Kogălniceanu str., 400084 Cluj-Napoca, Romania. * Corresponding author: zoltan.neda@ubbcluj.ro https://orcid.org/0000-0002-7319-5123

DOI:

https://doi.org/10.24193/subbphys.2020.04

Keywords:

colloidal particles, Brownian motion, cross-correlation.

Abstract

The two-body cross-correlation for the diffusive motion of colloidal nano-spheres is experimentally investigated. Polystyrene nano-spheres were used in a very low concentration suspension in order to minimize the three- or more body collective effects. Beside the generally used longitudinal and transverse component correlations we investigate also the Pearson correlation in the magnitude of the displacements. In agreement with previous studies we find that the longitudinal and transverse component correlations decay as a function of the inter-particle distance following a power-law trend with an exponent around -2. The Pearson correlation in the magnitude of the displacements decay also as a power-law with an exponent around -1.

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STUDIA UBB PHYSICA, Volume 65 (LXV), No. 1-2, December 2020

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Published

2020-12-30

How to Cite

KELEMEN, S., VARGA, L., & NÉDA, Z. (2020). CROSS-CORRELATIONS IN THE BROWNIAN MOTION OF COLLOIDAL NANOPARTICLES. Studia Universitatis Babeș-Bolyai Physica, 65(1-2), 27–34. https://doi.org/10.24193/subbphys.2020.04

Issue

Volume 65, No. 1-2, 2020

Section

Articles

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