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Gravity-induced phase phenomena in plate-rod colloidal mixtures

Title data

Eckert, Tobias ; Schmidt, Matthias ; de las Heras, Daniel:
Gravity-induced phase phenomena in plate-rod colloidal mixtures.
In: Communications Physics. Vol. 4 (2021) Issue 1 . - No. 202.
ISSN 2399-3650
DOI: https://doi.org/10.1038/s42005-021-00706-0

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
Open Access PublizierenNo information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Gravity can affect colloidal suspensions since for micrometer-sized particles gravitational and thermal energies can be comparable over vertical length scales of a few millimeters. In mixtures, each species possesses a different buoyant mass, which can make experimental results counter-intuitive and difficult to interpret. Here, we revisit from a theoretical perspective iconic sedimentation-diffusion-equilibrium experiments on colloidal plate-rod mixtures by van der Kooij and Lekkerkerker. We reproduce their findings, including the observation of five different mesophases in a single cuvette. Using sedimentation path theory, we incorporate gravity into a microscopic theory for the bulk of a plate-rod mixture. We also show how to disentangle the effects of gravity from sedimentation experiments to obtain the bulk behavior and make predictions that can be experimentally tested. These include changes in the sequence by altering the sample height. We demonstrate that both buoyant mass ratio and sample height form control parameters to study bulk phase behavior.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Colloids; Soft materials; Statistical physics
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics II
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics II > Chair Theoretical Physics II - Univ.-Prof. Dr. Matthias Schmidt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 12 Mar 2022 22:00
Last Modified: 14 Mar 2022 06:53
URI: https://eref.uni-bayreuth.de/id/eprint/68909