The ω³ scaling of the vibrational density of states in quasi-2D nanoconfined solids.

ABSTRACT: The vibrational properties of crystalline bulk materials are well described by Debye theory, which successfully predicts the quadratic ω² low-frequency scaling of the vibrational density of states. However, the analogous framework for nanoconfined materials with fewer degrees of freedom has been far less well explored. Using inelastic neutron scattering, we characterize the vibrational density of states of amorphous ice confined inside graphene oxide membranes and we observe a crossover from the Debye ω² scaling to an anomalous ω³ behaviour upon reducing the confinement size L. Additionally, using molecular dynamics simulations, we confirm the experimental findings and prove that such a scaling appears in both crystalline and amorphous solids under slab-con

SUBMITTER: Yu Y 

PROVIDER: S-EPMC9233700 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature