Editing Hard tetrahedron model

[[Image:tetrahedron.png|thumb|right]]
The '''hard tetrahedron model''' is a subset of [[hard polyhedra model]] that has been put forward as a potential model for [[water]]<ref>[http://dx.doi.org/10.1080/00268979500100281 Jiri Kolafa and Ivo Nezbeda "The hard tetrahedron fluid: a model for the structure of water?", Molecular Physics '''84''' pp. 421-434 (1995)]</ref>. 
==Maximum packing fraction==
It has recently been shown that regular tetrahedra are able to achieve packing fractions as high as <math>\phi=0.8503</math><ref>[http://dx.doi.org/10.1038/nature08641 Amir Haji-Akbari, Michael Engel, Aaron S. Keys, Xiaoyu Zheng, Rolfe G. Petschek, Peter Palffy-Muhoray  and  Sharon C. Glotzer "Disordered, quasicrystalline and crystalline phases of densely packed tetrahedra", Nature '''462''' pp. 773-777 (2009)]</ref> (the [[hard sphere model |hard sphere]] packing fraction is  <math>\pi/(3 \sqrt{2}) \approx 74.048%</math> <ref>[http://dx.doi.org/10.1038/26609 Neil J. A. Sloane "Kepler's conjecture confirmed", Nature '''395''' pp. 435-436 (1998)]</ref>). This is in stark contrast to work as recent as in 2006, where it was suggested that the "...regular tetrahedron might even be the convex body having the smallest possible packing density"<ref>[http://dx.doi.org/10.1073/pnas.0601389103 J. H. Conway and S. Torquato "Packing, tiling, and covering with tetrahedra", Proceedings of the National Academy of Sciences of the United States of America '''103''' 10612-10617 (2006)]</ref>.
==Phase diagram==
<ref>[http://dx.doi.org/10.1063/1.3651370 Amir Haji-Akbari, Michael Engel, and Sharon C. Glotzer "Phase diagram of hard tetrahedra", Journal of Chemical Physics '''135''' 194101 (2011)]</ref>
==Truncated tetrahedra==
Dimers composed of Archimedean truncated tetrahedra  are able to achieve packing fractions as high as <math>\phi= 207/208 \approx 0.9951923</math>
<ref>[http://dx.doi.org/10.1103/PhysRevLett.107.155501 Joost de Graaf, René van Roij, and Marjolein Dijkstra "Dense Regular Packings of Irregular Nonconvex Particles", Physical Review Letters '''107''' 155501 (2011)]</ref><ref>[http://dx.doi.org/10.1063/1.3653938  Yang Jiao and Salvatore Torquato "A packing of truncated tetrahedra that nearly fills all of space and its melting properties", Journal of Chemical Physics '''135''' 151101 (2011)]</ref> while a non-regular truncated tetrahedra can completely tile space <ref>[http://dx.doi.org/10.1021/nn204012y Pablo F. Damasceno, Michael Engel and Sharon C. Glotzer "Crystalline Assemblies and Densest Packings of a Family of Truncated Tetrahedra and the Role of Directional Entropic Forces", ACS Nano '''6''' pp. 609-614 (2012)]</ref>.
==Virial coefficients==
[[Virial equation of state#Virial coefficients|Virial coefficients]] <ref>[http://dx.doi.org/10.1080/00268976.2014.996618 Jiří Kolafa and Stanislav Labík "Virial coefficients and the equation of state of the hard tetrahedron fluid", Molecular Physics (''Latest articles'') (2015)]</ref>.
==References==
<references/>
'''Related reading'''
*[http://dx.doi.org/10.1103/Physics.3.37 Daan Frenkel "The tetrahedral dice are cast … and pack densely", Physics '''3'''  37 (2010)]
*[http://dx.doi.org/10.1063/1.4902992  Nikos Tasios, Anjan Prasad Gantapara and Marjolein Dijkstra "Glassy dynamics of convex polyhedra", Journal of Chemical Physics '''141''' 224502 (2014)]


[[category: models]]