posted on 2017-05-10, 00:00authored byPooja Sahu, Sk. Musharaf Ali, K. T. Shenoy
The
task of observing and understanding the relationship between
transport and thermodynamic properties of atomic and molecular fluids
has been a continuing open problem in condensed matter. The problem
becomes more complex and challenging when the fluids are confined
in nanoscale dimensions. In order to address this complex problem,
a scaling law has been established by linking the molecular diffusivity
and excess entropy of molecular liquids and liquid mixtures both in
bulk and under nanoconfinement, which is found to be quite universal
and also reproduces the earlier scaling law for atomic diffusion [Nature (London) 1996, 381,
137]. The excess entropy, which is central to this universal scaling
law, has been estimated using a robust and very fast “two phase
thermodynamic” (2PT) method, where density of states (DOS)
has been employed, which may also be obtained from power spectrum
of diffusing liquids using scattering experiments thus offers an indirect
route to determine the molecular diffusivity. The present scaling
law would contribute to the deeper understanding of molecular transport
in bulk and through CNTs, which might be very supportive for various
related fields of liquid filtration, biological applications, and
nanotechnologies.