Volume 119, Issue 4, 22 July 2003
Index of content:
119(2003); http://dx.doi.org/10.1063/1.1595646View Description Hide Description
A refined formulation of an existing polymerdensity functional theory is presented, wherein an intrachain stiffness is introduced via a bending potential. Comparisons with Metropolis Monte Carlo simulations in a slit geometry shows that this leads to a considerable improvement of the predicted density profile for a hard sphere polymer melt, at low density. We also show how the corresponding surface interactions are affected by the inclusion of this intramolecular correlation. We expect that the improvement obtained will be even more important in the description of, for example, polyelectrolytes, although such comparisons are not made in this preliminary study.
119(2003); http://dx.doi.org/10.1063/1.1594183View Description Hide Description
A new Raman band is observed in two gaseous binary mixtures, and It is attributable to a double Raman scattering process that takes place in pairs of unlike molecules. Spectral scattering intensities are given on an absolute scale. The zero order spectral moment is measured and compared with its long-range interaction value.
119(2003); http://dx.doi.org/10.1063/1.1594184View Description Hide Description
We introduce a mean-fieldmodel for the potential energy landscape of a thin fluid film confined between parallel substrates. The model predicts how the number of accessible basins on the energy landscape and, consequently, the film’s ideal glass transition temperature depend on bulk pressure, film thickness, and the strength of the fluid–fluid and fluid–substrate interactions. The predictions are in qualitative agreement with the experimental trends for the kinetic glass transition temperature of thin films, suggesting the utility of landscape-based approaches for studying the behavior of confined fluids.