Microscopic structure and dynamics of glass like domains in a low density binary mixture

Varughese, Anna; Jose, Prasanth P.

doi:10.1088/1742-6596/759/1/012019

Cited by 3 publications

(1 citation statement)

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“…Our study also shows that the glass transition in the presence of static structural inhomogeneities is very much similar to the continuous phases. Many aspects of the formation of the glassy domains in the model glassy binary mixtures are studied in the simulations [47,66] and experiments [44,45,67], where glass transition and phase separation coexist, though the inter-molecular potentials and molecular geometry are different from our study. Therefore, the simulations with more model potentials and varying range of attractions are required for obtaining the quantitative information about the microscopic glassy domains formed in the phase separating systems.…”

Section: Discussionmentioning

confidence: 82%

Violation of Stokes–Einstein and Stokes–Einstein–Debye relations in polymers at the gas-supercooled liquid coexistence

Singh

Jose

2020

J. Phys.: Condens. Matter

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Molecular dynamics simulations are performed on a system of model linear polymers to look at the violations of Stokes–Einstein (SE) and Stokes–Einstein–Debye (SED) relations near the mode coupling theory transition temperature T c at three (one higher and two lower) densities. At low temperatures, both lower density systems show stable gas-supercooled-liquid coexistence whereas the higher density system is homogeneous. We show that monomer density relaxation exhibits SE violation for all three densities, whereas molecular density relaxation shows a weak violation of the SE relation near T c in both lower density systems. This study identifies disparity in monomer mobility and observation of jumplike motion in the typical monomer trajectories resulting in the SE violations. In addition to the SE violation, a weak SED violation is observed in the gas-supercooled-liquid coexisting domains of the lower densities. Both lower density systems also show a decoupling of translational and rotational dynamics in this polymer system.

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