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Coarse-grained depletion potentials for anisotropic colloids: application to lock-and-key systems

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Original languageEnglish
Article number084907
Number of pages14
JournalJournal of Chemical Physics
Volume145
Issue number8
Early online date29 Aug 2016
DOIs
DateAccepted/In press - 11 Aug 2016
DateE-pub ahead of print - 29 Aug 2016
DatePublished (current) - Aug 2018

Abstract

When a colloid is mixed with a depletant such as a non-adsorbing polymer, one observes attractive effective interactions between the colloidal particles. If these particles are anisotropic, analysis of these effective interactions is challenging in general. We present a method for inference of approximate (coarse-grained) effective interaction potentials between such anisotropic particles. Using the example of indented (lock-and-key) colloids, we show how numerical solutions can be used to integrate out the (hard sphere) depletant, leading to a depletion potential that accurately characterises the effective interactions. The accuracy of the method is based on matching of contributions to the second virial coefficient of the colloids. The simplest version of our method yields a piecewise-constant effective potential; we also show how this scheme can be generalised to other functional forms, where appropriate.

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