Generation and characterization of surface layers on acoustically levitated drops.

Surface layers of natural and technical amphiphiles, e.g., octadecanol, stearic acid and related compounds as well as perfluorinated fatty alcohols (PFA), have been investigated on the surface of acoustically levitated drops.

FTIR study of CO2 and H2O/CO2 nanoparticles and their temporal evolution at 80 K.

Fourier transform infrared (FTIR) spectroscopy combined with a long-path collisional cooling cell was used to investigate the temporal evolution of CO2 nanoparticles and binary H2O/CO2 nanocomposites in the aerosol phase at 80 K. The experimental conditions for the formation of different CO2 particle shapes as slab, shell, sphere, cube, and needle have been studied by comparison with calculated data from the literature. The H2O/CO2 nanoparticles were generated with a newly developed multiple-pulse injection technique and with the simpler flow-in technique.

Molecular Interactions in Mixed Monolayers of Octadecanoic Acid and Three Related Amphiphiles.

Binary mixed monolayers of octadecanoic acid and three related amphiphilic compounds (octadecanamide, octadecylamine, octadecylurea) have been investigated at the air/water interface by surface pressure-area (Pi-Â) isotherms and their resistances to water evaporation (r). In addition, the excess free energies of mixing (DeltaG(E)) were calculated using the Goodrich method. Both the ln r vs x and DeltaG(E) vs x plots exhibit marked deviations from linearity, indicating a high degree of miscibility and nonideal behavior of the components in the mixed films.

Ignition of combustible/air mixtures by small radiatively heated surfaces.

Optical radiation as an ignition source in potentially explosive atmospheres was investigated for a number of explosive mixtures with respect to the most important case occurring in practice, i.e., absorption of the radiation by a solid target.

Equilibrium Penetration of DMPC Monolayers by Sodium Cholate.

The interaction of dimyristoyl phosphatidylcholine (DMPC) with sodium cholate was studied by equilibrium penetration measurements. Surface pressure-area isotherms for DMPC on substrates containing various concentrations of sodium cholate are presented. From these isotherms, the saturation adsorptions of the bile salt for various surface concentrations of DMPC were calculated.