Continuous Energies Research Articles

Solute concentration effect on osmotic reflection coefficient

A theory for the effect of concentration on osmotic reflection coefficient, correct to first order, was developed at the molecular level by considering the effect of solute-solute interactions on solute concentration and the fluid stress tensor within a solvent-filled pore. The solvent was modeled as a continuous fluid and potential energies between solute molecules and the pore wall were assumed to be pairwise additive. Although the theory is more general, calculations are presented only for excluded volume effects (hard-sphere for solute, hard-wall for pore). The relationship between the first-order concentration effect and the infinite dilution value of reflection coefficient appears to be geometry independent. The theory is discussed in light of experimental studies of osmotic flow that have recently appeared in the literature.

On the theory of the nonlinear acousto‐optical effect in semiconductors

AbstractThe modulation of the dielectric susceptibility of direct band gap semiconductors due to the interaction with sound waves is considered up to second order of the deformation tensor. The role of the Coulomb interaction between electrons and the holes, i.e. that of exciton states with discrete and continuous energies, is taken into account.