In a previous study, one of the authors of this work calculated the SOLVATION FORCE of a hard ellipsoid fluid with hard Gaussian overlap potential using hard needle wall interaction and non-linear equation proposed by Grimson-Rickyazen. In the present study, using density functional theory and extended restricted orientation model, the SOLVATION FORCE of hard ellipsoid fluid in the presence of more realistic rod-sphere and rod-surface interactions si calculated. We investigate weak and strong molecule-surface coupling strengths. The colloids distance effects on density profiles are calculated. We could not find the exact or simulation results for comparison. The results in the case k  3. 0 are compared with the SOLVATION FORCE of hard Gaussian overlap fluid and hard needle-wall interaction. The results corresponded, qualitatively.

The model fluids containing hard ellipses (HEs) and Gay-Berne (GB) particles where their center is moving in one dimension and confined between two parallel walls with different interactions are investigated using Monte Carlo simulation, NVT ensemble. The dependency of fluid pressure with respect to the wall distances is studied. The oscillatory behaviors are seen in this quantity against wall separations. The total average number density profile of particles is calculated using the angular number density. For both HE and GB particles confined between hard walls the total average number density at the wall shows a similar oscillatory behavior. We also related the pressure of these systems to the relevant SOLVATION FORCE between two colloidal particles. We have investigated the dependency of this quantity to the packing fraction, temperature, structure of the walls confining the particles and the interaction between ellipses of the fluid. Finally it is possible to reach the required SOLVATION FORCEs by changing the thermodynamic or structural properties.

SOLVATION FORCE in Lennard Jones and Stockmayer fluids at various temperatures is obtained by using the density functional theory (DFT) proposed by Rickayzen and Augousti (RA). The structure of Lennard Jones fluid confined to a slit is calculated by this theory. The density profile of Stockmayer fluid confined to a slit in the presence of external electric field is obtained by the density functional theory introduced by Moradi and Rickayzen. This functional is based on the extended Hypernetted Chain (HNC) theory which originally was introduced by RA. The calculated density profiles are used to obtain the SOLVATION FORCE at various temperatures and, as the results show, the SOLVATION FORCE depends on temperature, the interaction of the fluid molecules and the wall potential. Since the solvent in between colloidal particles is considered as a confined fluid, these calculations can be used to study the behavior of colloidal systems.

A proton NMR method for the determination of SOLVATION numbers of alkaline earth cations with hexamethyl phosphoramide in nitromethane as diluent is described. The method is based on monitoring the resonance frequency of solvent's protons as a function of solvent to metal ion mole ratio at constant metal ion concentration. The average SOLVATION number of cations, n, at any solvent/metal ion mole ratio was calculated from the NMR chemical shift-mole ratio data and was plotted against the mole ratio values. The SOLVATION numbers of alkaline earth cations were obtained from the limiting values of the corresponding n, vs. mole ratio plots.The effect of presence of water on the SOLVATION numbers of alkaline earth cations with HMP A was studied. In this case, variations in the resonance frequency of H2O protons brought about upon titration of the cations by HMP A was used to estimate the SOLVATION number of cations with these solvents.

A proton NMR method for the determination of SOLVATION numbers of alkaline earth cations with hexamethyl phosphoramide (HMPA) in nitromethane (NM) as diluent is described. The method is based on monitoring the resonance frequency of HMPA protons as a function of HMPA/metal ion molar ratio at constant metal ion concentration. The average SOLVATION number of cations, (n) over bar, at any HMPA/metal ion ratio obtained from the NMR chemical shift-molar ratio data was plotted against the molar ratios values. The SOLVATION numbers of each alkaline earth cation was determined from the limiting value of the corresponding (n) over bar, vs. molar ratio plot.

Preferential SOLVATION analysis on experimental solubility data of moxidectin was performed by using Invers Kirkwood-Buff Integrals approach at 298. 15 K. Local mole fraction of solvents in SOLVATION shell of moxidectin as well as the extent of preferential SOLVATION by each of solvents were calculated as a function of the bulk mole fraction of binary mixtures of water with methanol, ethanol, isopropanol and ethylene glycol. Results indicate that preferential SOLVATION of moxidectin by water occurs in water-rich regions. Whereas, beyond water-rich regions, moxidectin was preferentially surrounded by alcohols in all binary mixtures studied.

A proton NMR method for the study of the SOLVATION of alkaline earth cations with methanol (MeOH), ethanol (EtOH) and propanol (PrOH) in nitromethane (NM) as diluent is described. The method is based on monitoring the resonance frequency of alchohols protons as a function of solvent to metal ion mole ratio at constant metal ion concentration. The average SOLVATION number of cation,`n, at any alchohol/methal ion mole ratio was calculated from the NMR chemical shift-mole ratio data and was plotted against the mole ratio values. The SOLVATION numbers of alkaline earth cations were obtained from the limiting values of the corresponding`n vs. mole ratio plots. With regard to the results presented, there are increases in the SOLVATION number from Mg+2 to Sr+2 about every alcohols, but decreases in SOLVATION number from methanol to propanol as concerns every metal ion.