Showing papers in "Journal of Colloid and Interface Science in 1997"

TL;DR: State-of-the-art axisymmetric drop shape analysis techniques for the computation of interfacial tensions and contact angles by fitting the Laplace equation of capillarity to the shape and dimensions of pendant and sessile drops are presented.

TL;DR: In this article, anin situattenuated total reflection (ATR) and Fourier transform infrared (FTIR) method was used to measure sulfate adsorption as a function of aqueous sulfate concentration and pH.

TL;DR: The results of this study strongly supports the theory that asphaltenes are the most effective in stabilizing emulsions when they are near the point of incipient precipitation and points to the significance of the solubility state of the asphaltones in determining the emulsifying potential of these crude oils.

TL;DR: The correctness of the application of Good-van Oss theory to the calculation of acid-base components of solid surface free energies is considered, and it is shown that they can be rationalized or eliminated with more acid solvents being included in the solvent set and the properties of the reference solvent being correctly chosen.

TL;DR: The nonspecific binding of human immunoglobulin G (hIgG) and bovine serum albumin (BSA) was studied on gold surfaces modified by self-assembled alkyl thiol monolayers (SAMs) with the following terminal groups: CH3, C6H4OH, COO-, NH2, OH, and oligoethylene oxide (OEO).

TL;DR: It is found that on a given surface a wide range of liquids gave a unique value of reduced hysteresis, which apparently represents an intrinsic parameter describing liquid-solid interactions.

TL;DR: Comparisons reveal that SEI scales the flat plate interaction to the corresponding sphere-flat plate geometry exactly, while the scaling based on the conventional Derjaguin approximation technique grossly overpredicts the interaction energy for small particles and low electrolyte concentrations.

TL;DR: In this paper, the prefactork0 of the fractal aggregate scaling relationship was determined for both diffusion limited and diffusion limited cluster aggregation processes in spatial dimensions of 2, 3, 4, and 5.

TL;DR: The combination of shear- and strain-thickening behavior can be qualitatively explained using a clustering mechanism, which attributes the various phenomena to the formation of temporary, flow-induced clusters.

TL;DR: It was found that the power law force constants for asymmetric interactions are close to the geometric means of those for symmetric interactions and hydrophobic force constants can be combined in the same manner as the Hamaker constants.

TL;DR: Surface properties in terms of surface free energy of solid particles were investigated using capillary rise experimental methods based on Washburn's equation and a new link to the so-called geometrical factor of Washburn’s equation has been established.

TL;DR: From the results of the thermodynamic analysis, standard free energy DeltaG0, standard enthalpy DeltaH0, and standard entropy DeltaS0 of the adsorption process were calculated.

TL;DR: The C-O-C stretching bands of infrared spectra were found to shift toward higher wavenumbers with sol-gel transition, indicating that hydrogen bonding is not the driving force for gelation, and a mechanism of gelation based on micelles packing and entanglements is suggested.

TL;DR: Aqueous solutions of phenol, p-chlorophenol, and p-nitrophenol have been used to determine the adsorption isotherm for single solute systems on activated carbon at different temperatures to investigate the influence of concentration and temperature.

TL;DR: It is demonstrated that mixed Ni/Al hydroxide-like compounds can form when Ni is introduced into a suitable environment in which there is a source of hydrolyzed species of Al.

TL;DR: Although active carbons under study show appreciable differences in the BET specific surface area and the total pore volume, they exhibit quite similar porous properties, which is crucial in profound characterization of porous and nonporous solids by means of comparative methods of adsorption analysis.

TL;DR: The results indicate that the affinity of the organic acids is dominated by the electrostatic attraction, and the intrinsic affinity constants for the exchange reaction of surface water groups and organic acids, expressed per bond, increases with increasing number of reactive groups on the organic molecule.

TL;DR: The ferrofluid based on thiolated maghemite particles is stable between pH 3 and 11 and can be used for biomedical applications, and so the flocculation ranges of the complexed particles have been established for different pH.

TL;DR: Lead ion adsorption was observed to not significantly alter with temperature and was demonstrated to be completely reversible to pH adjustment, as well as established as a function of pH.

TL;DR: Measurements of absolute aggregation rate constants were performed for two samples of well-characterized spheroidal hematite particles with rather different surface morphology in spite of the pronounced differences in the surface roughness.

TL;DR: It has been shown that instead of copper oxide produced in aqueous solution, metallic copper particles are formed in w/o microemulsions because of the high local copper concentration in water pools of the microemulsion.

TL;DR: Quantitative relations between actual three-dimensional cluster parameters such as cluster radius of gyration, fractal dimension and number of monomers per aggregate, and measurable two-dimensional quantities such as longest lengths and projected area are given as a function of monomer overlap.

TL;DR: In this article, the authors reported accurate measurements of the kinetics of adsorption of two closely homologous serum albumins (human and bovine) to a hydrated metal oxide surface, using an accurate integrated optics technique.

TL;DR: Surface force and ellipsometry measurements illustrate that the cellulose film swells considerably in humid air and in water, suggesting that it is mostly amorphous.

TL;DR: In all cases, ferritin was found to be irreversibly adsorbed to gold and to form a stable protein layer, thus making it well suited as a biological receptor layer for immunosensing applications.

TL;DR: In this article, a modified version of the well-known equation for penetration into a single vertical cylindrical capillary and a simple new model for penetration in an assembly of vertical cylinrical capillaries with a radius distribution are discussed.

TL;DR: Time resolved electron microscopy indicated that nanosized primary particles formed immediately after mixing the reactants, followed by aggregation into larger uniform particles of submicrometer size.

TL;DR: The experimental results are shown to be in very good agreement with the theoretical predictions, thus verifying the validity of the model for the transient permeate flux in crossflow filtration and the underlying assumptions in the derivation of themodel.

TL;DR: An experimental study to investigate aggregation and breakup of particles in a Couette flow system with the inner cylinder rotating at constant speed found three different regimes, with the final diameter of the aggregate depending on both shear stress and particle concentration.

TL;DR: The results indicate the importance of using structurally defined surface sites to describe reactions at oxide-water interfaces, and the bond-valence model is described that relates the reactivities of surface functional groups and adsorption complexes to their molecular structures and compositions, and places constraints on the stoichiometries of advertisers' reactions, including proton release.