Article (Scientific journals)
Strong Effect ofWeak Charging in Suspensions of Anisotropic Colloids
Dorosz, Sven; Shegokar, Nikhilesh; Schilling, Tanja et al.
2014In Soft Matter
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Abstract :
[en] Suspensions of hard colloidal particles frequently serve as model systems in studies on fundamental aspects of phase transitions. But often colloidal particles that are considered as ``hard'' are in fact weakly charged. If the colloids are spherical, weak charging has a only a weak effect on the structural properties of the suspension, which can be easily corrected for. However, this does not hold for anisotropic particles. We introduce a model for the interaction potential between charged ellipsoids of revolution (spheroids) based on the Derjaguin approximation of Debye--Hückel Theory and present a computer simulation study on aspects of the system's structural properties and phase behaviour. In line with previous experimental observations, we find that even a weak surface charge has a strong impact on the correlation functions. A likewise strong impact is seen on the phase behaviour, in particular, we find stable cubatic order in suspensions of oblate ellipsoids.
Research center :
ULHPC - University of Luxembourg: High Performance Computing
Disciplines :
Physics
Author, co-author :
Dorosz, Sven ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Shegokar, Nikhilesh;  Indian Institute of Technology Bombay, Mumbai
Schilling, Tanja ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Oettel, Martin;  Eberhard Karls Universität Tübingen > Institut für Angewandte Physik
Language :
English
Title :
Strong Effect ofWeak Charging in Suspensions of Anisotropic Colloids
Publication date :
April 2014
Journal title :
Soft Matter
ISSN :
1744-6848
Publisher :
Royal Society of Chemistry, Cambridge, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 05 May 2014

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