We consider depletion effects of a pear-shaped colloidal particle in a hard-sphere solvent for two different model realizations of the pear-shaped colloidal particle. The two models are the pear hard Gaussian overlap (PHGO) particles and the hard pears of revolution (HPR). The motivation for this study is to provide a microscopic understanding for the substantially different mesoscopic self-assembly properties of these pear-shaped colloids, in dense suspensions, that have been reported in the previous studies. This is done by determining their differing depletion attractions via Monte Carlo simulations of PHGO and HPR particles in a pool of hard spheres and comparing them with excluded volume calculations of numerically obtained ideal configurations on the microscopic level. While the HPR model behaves as predicted by the analysis of excluded volumes, the PHGO model showcases a preference for splay between neighboring particles, which can be attributed to the special non-additive characteristics of the PHGO contact function. Lastly, we propose a potentially experimentally realizable pear-shaped particle model, the non-additive hard pear of revolution model, which is based on the HPR model but also features non-additive traits similar to those of PHGO particles to mimic their depletion behavior.
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21 July 2020
Research Article|
July 20 2020
Self-assembly and entropic effects in pear-shaped colloid systems. II. Depletion attraction of pear-shaped particles in a hard-sphere solvent
Philipp W. A. Schönhöfer
;
Philipp W. A. Schönhöfer
a)
1
College of Science, Health, Engineering and Education, Mathematics and Statistics, Murdoch University
, 90 South Street, Murdoch WA 6150, Australia
2
Institut für Theoretische Physik I, Friedrich-Alexander-Universität Erlangen-Nürnberg
, Staudtstraße 7, 91058 Erlangen, Germany
a)Author to whom correspondence should be addressed: Philipp.Schoenhoefer@fau.de
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Matthieu Marechal
;
Matthieu Marechal
2
Institut für Theoretische Physik I, Friedrich-Alexander-Universität Erlangen-Nürnberg
, Staudtstraße 7, 91058 Erlangen, Germany
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Douglas J. Cleaver
;
Douglas J. Cleaver
3
Materials and Engineering Research Institute, Sheffield Hallam University
, Sheffield S1 1WB, United Kingdom
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Gerd E. Schröder-Turk
Gerd E. Schröder-Turk
b)
1
College of Science, Health, Engineering and Education, Mathematics and Statistics, Murdoch University
, 90 South Street, Murdoch WA 6150, Australia
4
Department of Applied Mathematics, Research School of Physical Sciences and Engineering, The Australian National University
, 0200 Canberra, ACT, Australia
5
Department of Food Science, University of Copenhagen
, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
6
Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University
, Lund 22100, Sweden
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a)Author to whom correspondence should be addressed: Philipp.Schoenhoefer@fau.de
J. Chem. Phys. 153, 034904 (2020)
Article history
Received:
March 11 2020
Accepted:
June 12 2020
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Citation
Philipp W. A. Schönhöfer, Matthieu Marechal, Douglas J. Cleaver, Gerd E. Schröder-Turk; Self-assembly and entropic effects in pear-shaped colloid systems. II. Depletion attraction of pear-shaped particles in a hard-sphere solvent. J. Chem. Phys. 21 July 2020; 153 (3): 034904. https://doi.org/10.1063/5.0007287
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