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Issue 12, 2011
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Two dimensional assembly of triblock Janus particles into crystal phases in the two bond per patch limit

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Abstract

In recent experimental work on spherical colloidal particles decorated with two hydrophobic poles separated by an electrically charged middle band (triblock Janus particles)—when particles are confined by gravity at the bottom of the sample holder—self-assembly into a Kagome two dimensional lattice has been documented [Qian Chen, Sung Chul Bae and Steve Granick, Nature, 2011, 469, 381]. Here, we assess the ability of a simple two-patch effective potential to reproduce the experimental findings. The model parameters are selected to match the experimental values, with a short-range attraction mimicking hydrophobic interactions and a patch width that allows for a maximum of two contacts per patch. We show that the effective potential is able to reproduce the observed crystallisation pathway in the Kagome structure. On the basis of free energy calculations, we also show that the Kagome lattice is stable at low temperature and low pressure, but that it transforms into a hexagonal lattice with alternating attractive and repulsive bands on increasing pressure.

Graphical abstract: Two dimensional assembly of triblock Janus particles into crystal phases in the two bond per patch limit

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Publication details

The article was received on 15 Dec 2010, accepted on 22 Mar 2011, published on 16 May 2011 and first published online on 16 May 2011


Article type: Paper
DOI: 10.1039/C0SM01494J
Citation: Soft Matter, 2011,7, 5799-5804
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    Two dimensional assembly of triblock Janus particles into crystal phases in the two bond per patch limit

    F. Romano and F. Sciortino, Soft Matter, 2011, 7, 5799
    DOI: 10.1039/C0SM01494J

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