5 research outputs found
Simple Model of Capillary Condensation in porous media
We employ a simple model to describe the phase behavior of 4He and Ar in a
hypothetical porous material consisting of a regular array of infinitely long,
solid, parallel cylinders. We find that high porosity geometries exhibit two
transitions: from vapor to film and from film to capillary condensed liquid. At
low porosity, the film is replaced by a ``necking'' configuration, and for a
range of intermediate porosity there are three transitions: from vapor to film,
from film to necking and from necking to a capillary condensed phase.Comment: 14 pages, 7 figure
Specific heats of dilute neon inside long single-walled carbon nanotube and related problems
An elegant formula for coordinates of carbon atoms in a unit cell of a
single-walled nanotube (SWNT) is presented and the potential of neon (Ne)
inside an infinitely long SWNT is analytically derived out under the condition
of the Lennard-Jones potential between Ne and carbon atoms.
Specific heats of dilute Ne inside long (20, 20) SWNT are calculated at
different temperatures. It is found that Ne exhibits 3-dimensional (3D) gas
behavior at high temperature but behaves as 2D gas at low temperature.
Especially, at ultra low temperature, Ne inside (20, 20) nanotubes behaves as
lattice gas. A coarse method to determine the characteristic temperature
for low density gas in a potential is put forward. If
, we just need to use the classical statistical
mechanics without solving the Shr\"{o}dinger equation to consider the thermal
behavior of gas in the potential. But if , we
must solve the Shr\"{o}dinger equation. For Ne in (20,20) nanotube, we obtain
K.Comment: 14 pages, 7 figure