Showing papers in "Journal of Colloid and Interface Science in 1992"

TL;DR: In this paper, the authors investigated the mechanisms behind the formation and growth of silica particles prepared from tetraalkoxysilanes in alcoholic solutions of water and ammonia, and concluded that the growth proceeds through a surface reaction-limited condensation of hydrolyzed monomers or small oligomers.

TL;DR: In this article, contact angles of 17 liquids on 3 hydrophobic solid surfaces, FC721, fluorinated ethylene propylene, and polyethylene terephthalate, were measured by using the Axisymmetric Drop Shape Analysis-Profile (ADSA-P) technique.

TL;DR: In this paper, the surface polymers are modeled by the surface precipitation model and derived from X-ray absorption fine-structure (EXAFS) spectroscopic data interpreted by the polyhedral approach method.

TL;DR: In this paper, the detachment of colloidal particles (5 to 40 μm) from surfaces has been studied and a consistent method is presented to compute the deformation of the particle and the adhesion and lift forces acting on it at equilibrium.

TL;DR: In this paper, the effect of contact angle hysteresis on the effective disjoining pressure isotherms is also taken into account, and possible explanations of some experimental findings with emulsions stabilized by small adsorbed solid particles are proposed.

TL;DR: In this paper, general expressions for the energy of capillary meniscus forces acting between particles attached to a liquid-fluid interface are derived for the cases of two vertical cylinders and two similar spheres partially immersed in a liquid layer on a horizontal solid substrate.

TL;DR: In this article, the thermodynamic data for micelle formation of four selected 1-methyl-4-(C12-alkyl)pyridinium iodides in H2O at 25 and 95°C are described.

TL;DR: In this article, the authors used X-ray absorption fine structure (EXAFS) spectroscopy to study the structure of uranyl species in solution and on a montmorillonite clay and silica colloids.

TL;DR: In this article, pseudocubic particles of hematite (mean edge length 1.65 μm) with an exceedingly narrow size distribution (coefficient of variation 6.0%) have been prepared from highly condensed ferric hydroxide gel of approximately 1 mol dm−3 with a nominal excess concentration of ferric ions of 0.10 mol −3 through aging at 100°C for 8 days.

TL;DR: In this paper, the process of self-assembly of monolayers and bilayers from solution onto molecularly smooth mica surfaces was monitored as a function of time, and it was found that the adsorption or selfassembly of a monolayer or bilayer from solution always occurs in two distinct stages: a fast initial nonequilibrium stage, followed by a much slower phase involving slow molecular and ionic rearrangements toward the final equilibrium state.

TL;DR: In this article, the concentration dependence of surface tension was evaluated with DuNouy ring tensiometry for solutions of α-lactalbumin (α-Lac), β-Lactoglobulin (β-Lg), and bovine serum albumin (BSA).

TL;DR: In this article, the effect of four synthetically prepared compounds, 1,2-dihydroxy-1, 2-bis(dihd-phosphonyl)-1,4-butanedioic acid (BDBA), on the spontaneous precipitation of calcium carbonate in aqueous media was investigated.

TL;DR: In this paper, it was shown that the reversal of bubble charge can be attributed to specific adsorption of Al+3 and its hydroxo complexes at the gas-liquid interface in the low pH range and to precipitation of aluminum hydroxide in the intermediate pH range.

TL;DR: In this paper, a model for two-dimensional rapid and slow surface aggregation was proposed for quiescent systems, based on modified van der Waals and electrostatic interactions between particles at the surface.

TL;DR: In this paper, the Cahn-Hilliard density gradient theory was used in conjunction with the Flory, Orwoll, and Vrij (FOV) and the Sanchez and Lacombe (SL) equations of state theories to predict surface tension with bulk pressure-volume-temperature data.

TL;DR: Both the protein-surface interactions, such as hydrophobic and electrostatic ones, and the lateral interaction between adsorbed molecules are dominant factors that control protein adsorption on these particles.

TL;DR: In this paper, the viscoelastic properties of electrostatically stabilized concentrated dispersions of silica and of glass particles in a glycerol/water mixture are studied by oscillatory shear measurements.

TL;DR: In this paper, a new method for preparing wettability gradients on polyethylene surfaces was developed by treating the polymer sheets in air with corona from a knife-type electrode whose power gradually increases along the sample length.

TL;DR: In this paper, the authors studied the crystallization process in a colloidal system of slightly charged spherical particles with time-resolved static light scattering and found that the size of the crystallites, the number concentration of crystallites and nucleation and crystallite growth rates, as functions of the concentration, are strongly dependent on the concentration of the initially metastable colloidal fluid.

TL;DR: In this paper, the formation of a Cr(OH)3 precipitate on δ-MnO2 was shown to be due to surface-facilitated nucleation.

TL;DR: In this article, the authors presented the first report on the interfacial behavior of surfactin and found that the adsorption, Γmax, of the lipopeptide at the interface of diluted solutions is around 3 × 1018 molecule m−2.

TL;DR: In this paper, the effect of micelle counterion on the interaction of poly (ethyleneoxide) with dodecylsulfate micelles has been studied, using dye solubilization to determine the critical micelle concentration and dynamic light scattering to measure the relative amount of uncomplexed mouselles.

TL;DR: In this paper, the effects of adsorbed fulvic acid, a naturally occurring organic acid, on the kinetics of hematite aggregation and on the resulting structure were investigated.

TL;DR: In this paper, a triblock copolymer of the type polyethyleneoxide-block-polypropyleneoxide, block-polyoxyleneoxide-polyoxide (Pluronic L-64, average composition 26 EO-units and 30 PO-units) was examined with static and dynamic light scattering (DLS), pulsed-gradient spin-echo (PGSE) NMR and fluorescence spectroscopy over a range of concentrations (0.2-25 wt%) and temperatures (15-60°C).

TL;DR: In this article, the authors performed a series of small angle neutron scattering (SANS) measurements on asphaltene solutions in toluene at various temperatures to study the structure and polydispersity of colloids.

TL;DR: In this article, the effects of exposure to a magnetic field on the stability of nonmagnetic colloidal particles, such as ultrafine polystyrene latex and SiO2 particles in electrolyte solutions, were examined by measuring the rapid coagulation rate constant on a low-angle light-scattering apparatus.

TL;DR: In this article, the authors measured the temporal evolution of cluster-size distributions cn(t) during salt-induced aggregation of polystyrene microspheres, 258 nm in radius.

TL;DR: In this paper, the atomic force microscope (AFM) was used to measure forces between a silica surface and a small silica particle, in aqueous CaCl 2 solutions.

TL;DR: In this article, the use of simultaneous, multiangle static light scattering measurements for studying the kinetics of coagulation of monodisperse spherical colloids is reported, and absolute coagulations rate constants are determined from analysis of the change in the angular dependence of the scattered light intensity with time, at the early stage of the aggregation process.

TL;DR: In this paper, a phase contrast microscope equipped with an ultra long working distance objective was used to study the deposition of 736-nm diameter monodisperse polystyrene latex particles from a potassium nitrate solution (1 and 60 m M ) to glass, using varying flow rates (0.034 to 0.456 cm 3 ·s −1 ).