Papers by Keyword: Solubility Parameter

Abstract: Nanofluids, which are suspensions of nanoparticles dispersed in a base fluid, have remarkable potential in a wide range of applications. However, the stability of the nanofluid has remained a challenge and a matter of concern. A lot of research, development work and reviews have been conducted on the preparation and stability of nanofluids. In this study, calculation of solubility parameter values using a molecular modelling software were performed to aid the screening of nanoparticles that are compatible with the base fluid. The solubility parameter is the numerical representation of the solvency behavior between two molecules. A molecular modelling software was used to study the solubility parameter values of nanoparticles to determine their compatibility with the base fluids. To validate the model, the computed values were compared against published literature and it was shown that the model has achieved more than 95% accuracy. The simulations were verified with experimental work with varying concentration of nanoparticles in brine solution and deionized water. Experimental results showed that zinc oxide nanoparticles demonstrated the best compatibility with the base fluid, which tally with the simulation.

Abstract: The compatibilities of polymer blends, Polypropylene (PP) and Polyamide12(PA12), was simulated by molecular dynamics (MD) simulations. Density, cohesive energy density (CED) ,and solubility parameters (δ) of pure substances and PP/PA12 blends were calculated by MD simulations with the COMPASS force field for the prediction of polymer blends compatibility . Results showed that PP/PA12 is not miscrible by comparing the difference in the solubility parameter value ( Δδ), radial distribution function value. The predictions agreed well with the experimental results. So it can be showed that MD simulation is a valid method to provide information on miscibility of polymer blends.

Abstract: swelling; core-shell microspheres; Janus; solubility parameter; polar fraction Abstract. Janus particles have particular properties and potential application for their asymmetry dual-faced structure. In this report, we study the effect of the solubility parameter and the polar fraction of solvent on the swelling assisted with protrusion of polystyrene @ titanium dioxide (PS@TiO₂) core-shell microspheres. The resultant titanium dioxide/polystyrene (TiO₂/PS) Janus particles were characterized by scanning electron microscope. Results indicated that solvent with the solubility parameter of about 9.3 (cal/cm³)^1/2 and with low polarity such as dimethylbenzene, carbon disulfide and methyl methacrylate exhibited the preferable swelling efficiency. Janus particles have particular properties and potential application for their asymmetry dual-faced structure. In this report, we study the effect of the solubility parameter and the polar fraction of solvent on the swelling assisted with protrusion of polystyrene @ titanium dioxide (PS@TiO₂) core-shell microspheres. The resultant titanium dioxide/polystyrene (TiO₂/PS) Janus particles were characterized by scanning electron microscope. Results indicated that solvent with the solubility parameter of about 9.3 (cal/cm³)^1/2 and with low polarity such as dimethylbenzene, carbon disulfide and methyl methacrylate exhibited the preferable swelling efficiency.

Abstract: This article reports on the estimation of solubility parameters using refractive index for a series of imidazolium-based ionic liquids (ILs) and their dependencies on the carbon number of alkyl side-chain of cation and anion. Gathering about 35 ILs of refractive indices data from the literature, the solubility parameters estimation fit well with the suggested correlation. The precision of the estimated solubility parameters obtained indicates that the refractive index-solubility parameters correlation can be an alternative tool to estimate solubility parameter value for ILs.

Abstract: Fluorinated amorphous carbon (a-C:F) films have long attracted much consideration due to their low surface energy, hydrophobicity, low refractive index, good electrical and thermal insulation and good thermal stability, and so on. To repair of some polymer films that have good flexibility and low permeability, F₂₃₁₄ resin was used as main film-forming material of coating in this paper. The solubility parameter of F₂₃₁₄ was estimated by group contribution method, which is 20.548 J^1/2•cm^-3/2. And proper solvents were selected on the basis of the solubility parameter. FEVE resin was selected as one of the components of coating, because of its good adhesion and compatibility. The adhesion of the F₂₃₁₄ coating was improved, and penetration resistance performance of F₂₃₁₄ coating was enhanced to 300(mg•mm)/(m²•h).

Abstract: Water/CO2 (W/C) microemulsion was formed by sodium salt of bis(2,2,3,3,4,4,5,5-octa fluoro-1-pentyl)-2-sulfosuccinate and the phase behavior of this emulsion was investigated in supercritical state. In addition, the change of the phase behavior of W/C microemulsion was observed when various organic solvents were added into this microemulsion. The added organic solvents are isopropanol, n-propanol, ethanol, methanol, pyridine, 2-methoxyethanol, tetrahydrofuran, acetonitrile, acetone, and 1,4-dioxane. According to the results, the phase behavior of W/C microemulsion depended on the temperature and pressure and the microemulsion was thermodynamically stable in the special range of pressure. In case of W/C microemulsion with organic solvents, the phase behavior of this system was affected by the solubility parameter of organic solvents.