Sedimentation profiles and phase stacking diagrams in polydisperse hard rounded rectangle fluids

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00009176
URN to cite this document: urn:nbn:de:bvb:703-epub-9176-2

Title data

Eckert, Tobias ; de las Heras, Daniel ; Velasco, Enrique ; Martínez-Ratón, Yuri:
Sedimentation profiles and phase stacking diagrams in polydisperse hard rounded rectangle fluids.
In: Physical Review E. Vol. 112 (2025) . - 065410.
ISSN 2470-0053
DOI der Verlagsversion: https://doi.org/10.1103/kd2c-5hkf

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Project information

Project title:	Project's official title Project's id Vielteilchensysteme aus weicher Materie unter dem Einfluss externer Felder 550390029 Open Access Publizieren No information
Project financing:	Deutsche Forschungsgemeinschaft

Abstract

We analyze the sedimentation behavior of a polydisperse two-dimensional liquid-crystal fluid using a local density-functional theory based on scaled particle theory. Polydispersity is incorporated through variations in the roundness of hard rectangular particles interacting solely via excluded area effects. Despite its simplicity, the model displays a rich phenomenology. In bulk, the fluid exhibits isotropic, nematic, and tetratic phases. In sedimentation, we obtain complex phase stacking diagrams featuring multiphasic stacking sequences with up to four stacks of different bulk phases, inverted stacking sequences such as top isotropic and bottom nematic together with top nematic and bottom isotopic, as well as stacking sequences with reentrant stacks such as tetratic and nematic stacks floating between two isotropic stacks. This phenomenology arises as a result of an intricate coupling between particle polydispersity and the effect of gravity. Our approach can be easily adapted to investigate the sedimentation behavior of other polydisperse colloidal systems.

Further data

Item Type:	Article in a journal
DDC Subjects:	500 Science > 530 Physics
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors > Chair Theoretical Physics V - Univ.-Prof. Dr. Daniel De Las Heras Diaz-Plaza Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-9176-2
Date Deposited:	11 May 2026 07:46
Last Modified:	11 May 2026 10:17
URI:	https://epub.uni-bayreuth.de/id/eprint/9176

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