Showing papers in "Journal of Colloid and Interface Science in 1996"

TL;DR: In this article, a set of image processing algorithms for extracting quantitative data from digitized video microscope images of colloidal suspensions is described, which can locate submicrometer spheres to within 10 nm in the focal plane and 150 nm in depth.

TL;DR: In this paper, an ion adsorption model for metal hydroxides has been developed which deals with the observation that in the case of inner sphere complex formation only part of the surface complex is incorporated into the surface by a ligand exchange reaction while the other part is located in the Stern layer.

TL;DR: In this article, a direct comparison of theoretical predictions and experimental results on instabilities and various stages of dewetting of thin polystyrene films, prepared on silicon wafers with three different nanosized (∼1 nm) coatings, dewet spontaneously above the glass transition temperature by the growth of cylindrical holes with wavy rims.

TL;DR: In this paper, magnetite particles of average diameter 4-7 nm were prepared by precipitation in a polyvinylalcohol (PVA) aqueous solution, and the saturation magnetization of the particles was above 50 emu/g.

TL;DR: The IR data are in good agreement with a monodentate coordination of phosphate to the surfaces, where the three surface complexes only differ in the degree of protonation.

TL;DR: In this paper, the adsorption of both plasmid and chromosomal duplex DNA to silica was investigated with the aim of determining the dominant forces involved in the binding reaction.

TL;DR: In this article, Sessile-drop and captive-bubble techniques were used for contact angle measurements for water and ethylene glycol at self-assembled monolayer surfaces of dodecanethiol.

TL;DR: The reported data, which are supplemented with information on the charging behavior of TiO(2) suspended in indifferent electrolyte solutions, are interpreted in terms of the multi-site surface complexation model.

TL;DR: No basal plane participation is required to explain the site densities determined from proton adsorption isotherms, and independent evidence from scanning force microscopy points to a higher percentage of edge surface area due to thicker particles and basal surface steps than previously assumed.

TL;DR: In this article, a set of analytical equations are developed for calculating the van der Waals and electrostatic interaction energies between a rough spherical particle and a smooth plate, where the particle roughness is modeled as hemispherical asperities of fixed radius, in agreement with SEM micrographs of polystyrene latex spheres.

TL;DR: In this paper, the Tabor-Winterton approximation of the Hamaker constant was compared to the results obtained from other accurate measurement techniques such as the quantifioscillator model, a multiple oscillator model and A's calculated cation of these phenomena.

TL;DR: In this article, the surface properties of oxides and hydroxides depend on their surface hydroxyl configuration (SHC), and the SHC of the various Fe (hydr)oxides has not been systematically studied to date.

TL;DR: In this article, a flotation model was developed by considering both hydrodynamic and surface forces involved in the process, and the hydrophobic forces were determined using a stream function and then used for estimating the kinetic energies that can be used for thinning the water films between bubbles and particles.

TL;DR: In this article, the surface stress changes at solid-gas and solid-liquid interfaces with an atomic force microscope are measured, where the bending of a microfabricated cantilever, prepared with different opposite faces, is measured.

TL;DR: It was found that the tilt of the drop profiles may lead to large errors in the resultant IFT values if the tilt was not corrected before or during the optimization procedure, which could be reduced drastically if a profile were averaged between its two sides and the mean profile were used for optimization.

TL;DR: A coating model is formulated that not only predicts correctly the film thickness, but also captures the postblink lipid spreading commonly observed in experiments and shows explicitly how this breakup time is related to tear viscosity, surface tension, meniscus radius, and initial and final film thicknesses.

TL;DR: An experimental investigation was performed on electrosprays of low electric conductivity liquids (heptane with different amounts of an antistatic additive) that were operated in the cone-jet mode and showed that the droplet size and the spray monodispersity were independent of the electrode configuration.

TL;DR: The CD-MUSIC model is applied to the adsorption of metal cations, using an extended data set for cadmium adsorbing on goethite and the results are consistent with recent EXAFS results.

TL;DR: Comparison of the two polymeric flocculants revealed that both the fractal dimension and the tendency for ruptured fragments to reflocculate were sensitive to the polymer used.

TL;DR: Wetting experiments were performed to determine how contact angles and their hysteresis change with the mechanical properties of soft substrates, and the height of the ridge pulled up by the surface tension of the liquid drop must be greater than the local roughness.

TL;DR: In this paper, the solubilization of small unilamellar lecithin vesicles by some different alkyl sulfate surfactants (C10SO4, C12SO4-, and C14SO4-) was investigated by means of light scattering and cryo-transmis.

TL;DR: In this paper, BSA adsorption experiments were performed, using highly carboxylated PS/PMAA microspheres as well as conventional ones, and two kinds of interaction forces were considered, hydrogen bonding and hydrophobic interactions, while ionic interactions were assumed to be small or constant.

TL;DR: In this paper, the role of polymer conformation was found to be very important upon isolating the electrostatic effect by comparing the flocculation results under constant zeta potential.

TL;DR: In this article, it is shown that metastable fluid films on solid surfaces are destabilized when the applied capillary pressure exceeds a critical disjoining pressure, leading to a wettability reversal of the solid substrate that can be detected using AFM measurements.

TL;DR: In this paper, the authors investigated the rheological properties of aqueous dispersions of the synthetic hectorite clay Laponite RD that form gel-like structures and showed that the reorganization of the gel structure determining this thixotropic phenomenon is interpreted as a cooperative self-delaying process similar to the aging of glassy polymers or precipitation from supersaturated solid solutions.

TL;DR: In this article, it has been concluded that the nuclei of the hematite particles are initially generated with the formation of beta-FeOOH particles and that they are grown by deposition of the solute originally present in the solution phase and indirectly furnished from the alpha-FeOH by dissolution.

TL;DR: In this article, the extinction spectra of sols with the particle size and axial ratio polydispersity are calculated using Mie's theory, the T-matrix method, and various experimental sets of the bulk gold optical constants modified with regard to size-limiting effects.

TL;DR: In this article, the forces of interaction between a flat poly(tetrafluoroethylene) (PTFE) surface and gold spheres (of radii 3-8 μm) were measured as a function of apparent surface separation for different intervening media.

TL;DR: In this paper, two series of cationic surfactants, each with two hydrophilic and two hyrophobic groups in the molecule (gemini) have been synthesized and the dynamic behavior of their aqueous solutions was studied by the maximum bubble pressure method.

TL;DR: In this paper, a kinetic study of the reaction between colloidal manganese dioxide and oxalic acid in aqueous acetate media (pH 4.3-5.1) is reported.