Zobrazeno 1 - 10
of 201
pro vyhledávání: '"Fragiadakis, D."'
Autor:
Fragiadakis, D., Roland, C. M.
A broad variety of liquids conform to density scaling: relaxation times expressed as a function of the ratio of temperature to density, the latter raised to a material constant {\gamma}. For atomic liquids interacting only through simple pair potenti
Externí odkaz:
http://arxiv.org/abs/1904.02026
Publikováno v:
Phys. Rev. Lett. 123, 189601 (2019)
Recently Sanz et al. [A. Sanz, T. Hecksher, H.W. Hansen, J.C. Dyre, K. Niss, and U.R. Pedersen, Phys. Rev. Lett. 122, 055501 (2019).] reported that the scaling exponent gamma for tetramethyl-tetraphenyl-trisiloxane (DC704) varied with temperature; i.
Externí odkaz:
http://arxiv.org/abs/1904.01424
Autor:
Fragiadakis, D., Roland, C. M.
Using molecular dynamics simulations we examine the system size dependence of the fast dynamics in two model glass forming liquids, one of them a Lennard-Jones mixture for which cooperative fast relaxation has been reported. We find no indication of
Externí odkaz:
http://arxiv.org/abs/1802.05325
Autor:
Fragiadakis, D., Roland, C. M.
We describe a method to determine whether a material has isomorphs in its thermodynamic phase diagram. Isomorphs are state points for which various properties are invariant in reduced units. Such materials are commonly identified from strong correlat
Externí odkaz:
http://arxiv.org/abs/1706.05994
Autor:
Fragiadakis, D., Roland, C. M.
We show using molecular dynamics simulations that simple diatomic molecules in the glassy state exhibit only limited participation in the Johari-Goldstein (JG) relaxation process. That is, with sufficient cooling local reorientations are essentially
Externí odkaz:
http://arxiv.org/abs/1703.08213
Autor:
Fragiadakis, D., Roland, C. M.
The elusive connection between dynamics and local structure in supercooled liquids is an important piece of the puzzle in the unsolved problem of the glass transition. The Johari-Goldstein beta relaxation, ubiquitous in glass-forming liquids, exhibit
Externí odkaz:
http://arxiv.org/abs/1610.08834
Publikováno v:
J. Chemical Physics 142, 064504 (2015)
The origin of the dramatic changes in the behavior of liquids as they approach their vitreous state - increases of many orders of magnitude in transport properties and dynamic time scales - is a major unsolved problem in condensed matter. These chang
Externí odkaz:
http://arxiv.org/abs/1410.0625
Autor:
Fragiadakis, D., Roland, C. M.
Molecular dynamics simulations were carried out on a Lennard-Jones binary mixture of rigid (fixed bond length) diatomic molecules. The translational and rotational correlation functions, and the corresponding susceptibilities, exhibit two relaxation
Externí odkaz:
http://arxiv.org/abs/1307.6823
Autor:
Fragiadakis, D., Roland, C. M.
Strong correlation between equilibrium fluctuations of the potential energy, U, and the virial, W, is a characteristic of a liquid that implies the presence of certain dynamic properties, such as density scaling of the relaxation times and isochronal
Externí odkaz:
http://arxiv.org/abs/1208.5790
Autor:
Fragiadakis, D., Roland, C. M.
Molecular dynamics simulations (mds) were carried out to investigate the reorientational motion of a rigid (fixed bond length), asymmetric diatomic molecule in the liquid and glassy states. In the latter the molecule reorients via large-angle jumps,
Externí odkaz:
http://arxiv.org/abs/1203.2127