2017
DOI: 10.1098/rsfs.2016.0161
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Purely entropic self-assembly of the bicontinuous Ia 3 d gyroid phase in equilibrium hard-pear systems

Abstract: We investigate a model of hard pear-shaped particles which forms the bicontinuous Ia[Formula: see text]d structure by entropic self-assembly, extending the previous observations of Barmes (2003, 021708. (doi:10.1103/PhysRevE.68.021708)) and Ellison (2006, 237801. (doi:10.1103/PhysRevLett.97.237801)). We specifically provide the complete phase diagram of this system, with global density and particle shape as the two variable parameters, incorporating the gyroid phase as well as disordered isotropic, smectic and… Show more

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Cited by 18 publications
(40 citation statements)
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“…While the phase behavior of spherical ABPs can be explained solely by effective attractions [10,15,16] and that of active nematic rods by an effective (longer) aspect ratio [33], an appropriate effective potential for SPRs should account for their characteristic broken updown symmetry. The most simplistic passive model system with this property consists of hard pear-shaped objects, for which it has been detailed recently that the nematic phase destabilizes with increasing deviation from ellipsoidal shape [56]. This observation suggests an intuitive mapping to describe the IN transition in qualitative agreement with our simulations, which is yet to be quantified.…”
Section: Discussionsupporting
confidence: 77%
“…While the phase behavior of spherical ABPs can be explained solely by effective attractions [10,15,16] and that of active nematic rods by an effective (longer) aspect ratio [33], an appropriate effective potential for SPRs should account for their characteristic broken updown symmetry. The most simplistic passive model system with this property consists of hard pear-shaped objects, for which it has been detailed recently that the nematic phase destabilizes with increasing deviation from ellipsoidal shape [56]. This observation suggests an intuitive mapping to describe the IN transition in qualitative agreement with our simulations, which is yet to be quantified.…”
Section: Discussionsupporting
confidence: 77%
“…2). The simulations are carried out using the same methodology as in [61], adjusted to include the hard-sphere solvent. The system is set up within a cubic box with three-dimensional periodic boundary conditions, with an overall particle packing fraction ρ = 0.56 and a 1:9 volume ratio of solvent particles to pear-shaped particles (v= .…”
Section: Molecular Dynamics Of Mixtures Of Sphere and Pear-shaped Parmentioning
confidence: 99%
“…The implementation of spheres to create curvature might be also an explanation for the stabilisation and preference of the double Diamond phase over the double Gyroid in general. In our earlier studies [61] we determined a correlation between the interdigitation depth and the local Gauss curvature of the system. The further pears reach into the realm of the opposite channel system, the more curvature is contributed to the interface between both pear particle clusters.…”
Section: Self-assembly Of Bicontinuous Phases In Pear Sphere Systemsmentioning
confidence: 99%
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“…While shape and form adapt through evolution, this process is mediated by the physical forces and principles that actually shape the material. Again, this collection offers some insights, both relating to the very same forces that Thompson was considering (surface tension, [16]), as well as more complex interfacial forces [17] and interactions [18], as well as entropic principles [19] and non-equilibrium effects in pattern formation [20]. In our view, science must ultimately reconcile the geometry and forces approaches, that remain largely divorced from each other.…”
mentioning
confidence: 92%