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Issue 47, 2014
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“Crystal-clear” liquid–liquid transition in a tetrahedral fluid

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For a model known to exhibit liquid–liquid transitions, we examine how varying the bond orientational flexibility affects the stability of the liquid–liquid transition relative to that of the crystal phases. For very rigidly oriented bonds, the crystal is favored over all amorphous phase transitions. We find that increasing the bond flexibility decreases both the critical temperature Tc for liquid–liquid phase separation and the melting temperature Tm. The effect of increasing flexibility is much stronger for melting, so that the distance between Tc and Tm progressively reduces and inverts sign. Under these conditions, a “naked” liquid–liquid critical point bulges out in the liquid phase and becomes accessible, without the possibility of crystallization. These results confirm that a crystal-clear, liquid–liquid transition can occur as a genuine, thermodynamically stable phenomenon for tetrahedral coordinated particles with flexible bond orientation, but that such a transition is hidden by crystallization when bonds are highly directional.

Graphical abstract: “Crystal-clear” liquid–liquid transition in a tetrahedral fluid

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Publication details

The article was received on 18 Aug 2014, accepted on 23 Sep 2014 and first published on 23 Sep 2014

Article type: Paper
DOI: 10.1039/C4SM01835D
Author version available: Download Author version (PDF)
Citation: Soft Matter, 2014,10, 9413-9422
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    “Crystal-clear” liquid–liquid transition in a tetrahedral fluid

    F. W. Starr and F. Sciortino, Soft Matter, 2014, 10, 9413
    DOI: 10.1039/C4SM01835D

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