82 citations · 257 across the 11 of their papers we have counts for
12 papers
Chain Flexibility and the Segmental Dynamics of Polymers
Daniel Fragiadakis, C. Michael Roland
Using molecular dynamics simulations we examine the dynamics of a family of model polymers with varying chain length and torsional potential barriers. We focus on features of the d…
Intermolecular distance and density scaling of dynamics in molecular liquids
D. Fragiadakis, C. M. Roland
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 γ.…
Comment on "Experimental Evidence for a State-Point-Dependent Density-Scaling Exponent of Liquid Dynamics"
T. C. Ransom, R. Casalini, D. Fragiadakis +2
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 t…
Cooperativity of short-time dynamics revisited
D. Fragiadakis, C. M. Roland
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 co…
A test for the existence of isomorphs in glass-forming materials
D. Fragiadakis, C. M. Roland
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 redu…
Participation in the Johari-Goldstein Process - Molecular Liquids versus Polymers
D. Fragiadakis, C. M. Roland
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.…