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Strong effect of weak charging in suspensions of anisotropic colloids

DSpace at IIT Bombay

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Title Strong effect of weak charging in suspensions of anisotropic colloids
 
Creator DOROSZ, S
SHEGOKAR, N
SCHILLING, T
OETTEL, M
 
Subject HARD ELLIPSOIDS
PHASE
PARTICLES
 
Description 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 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-Huckel 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.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2014-12-28T15:01:54Z
2014-12-28T15:01:54Z
2014
 
Type Article
 
Identifier SOFT MATTER, 10(26)4717-4724
1744-683X
1744-6848
http://dx.doi.org/10.1039/c4sm00612g
http://dspace.library.iitb.ac.in/jspui/handle/100/16820
 
Language English