Showing papers in "Journal of Colloid Science in 1961"

TL;DR: In this paper, the deformation, orientation, and burst of fluid drops suspended in a liquid subjected to both hyperbolic and shear flow have been measured for a large number of fluid pairs covering a wide range of viscosity ratio p. At low deformation excellent agreement, with theoretical equations due to Taylor and Cerf was found.

TL;DR: In this article, a general formula has been derived for the interaction of spherical particles surrounded by any number of concentric shells of adsorbed material, and it is shown that the interaction energy of solvated particles may be reduced by factors of the order of 5 to 50 compared to that of unsolvated ones.

TL;DR: In this article, the Helmholtz-Smoluchowski equation for the electrophoretic mobility and the viscosity in the electrical double layer are considered, and the relation between mobility and surface potential is investigated.

TL;DR: In this paper, the relation between the contact angles and the interfacial tensions for a liquid droplet resting on a solid surface is examined and the limitations of Young's equation and Neumann's triangle are defined.

TL;DR: In this article, the hydrodynamic behavior of the particles was typical of rigid rods and the length of the equivalent prolate ellipsoid was much greater for suspensions made from bacterial cellulose than from ramie fibers.

TL;DR: In this paper, a model is described by means of which the elastic modulus of the system can be correlated with the forces acting between the particles, and their contribution to the modulus is calculated.

TL;DR: In this paper, the authors used the variation in electrical conductance with change in concentration of aqueous solutions to determine the critical micelle concentration of several isomeric sodium C10 and C14 alkyl sulfates at temperatures from 10° to 70°C.

TL;DR: In this article, a series of binary mixtures of a horizontally oriented polar polymer with seven different vertically oriented compounds were studied, and the effects of these mixtures on the structure and behavior of mixed films were investigated.

TL;DR: The approach of nitrogen bubbles to the free surface of aqueous glycerol solutions and polyglycol oils was investigated using interference rings and interference colors to estimate the thickness of the liquid films.

TL;DR: In this paper, a treatment of adsorption kinetics is presented, which takes explicit account of the diffusion process without presupposing the absence of an adorption barrier, and a new equation suitable for the treatment of experimental data is derived, and its utility is discussed.

TL;DR: The relation of relative viscosity ηr to volume fraction φ for a series of monodisperse polystyrene latexes was determined for particle diameters between 990 A and and 8710 A as mentioned in this paper.

TL;DR: The circulation pattern inside fluid drops suspended in a liquid subjected to hyperbolic and to shear flow has been studied and compared with that predicted from a fluid mechanical theory which assumes that the drops remain spherical and that shear stresses are transmitted without diminution across the drop interface.

TL;DR: In this paper, a method for obtaining differential double layer capacities on silver iodide was described, and the influence of the nature and concentration of indifferent electrolytes was investigated, viz., the nitrates of Li, K·, Rb·, NH4·, H·, Tl·, Mg··, Ba··, Co··, Cd··, Pb··, La···, Th····, the fluoride, chloride, and sulfate of K ·, NaClO4 in 10−3 and 10−1M solutions.

TL;DR: In this paper, critical micelle concentrations and micellar molecular weights, determined by light scattering, are presented for a series of commercially prepared polyoxyethylene lauryl alcohols and nonyl phenols.

TL;DR: In this article, a self-consistent assignment of composition to the mixed micelles is proposed based on an extrapolation on the conductivity vs. concentration plot to obtain the concentration of monomers in a mixed solution in the same way in which the critical micelle concentration is obtained in a pure system.

TL;DR: In this paper, a general formulation for the phenomenon of charge generation in low conductivity liquids as they flow past surfaces is described. But this formulation is specific to specific situations and is not suitable for the case of uniform velocity profile.

TL;DR: In this paper, an extensive and more complete study of light scattering of three BASF and eight Dow polystyrene latexes was undertaken, and theoretical functions, published in a foregoing paper, were applied.

TL;DR: In this article, the viscoelastic properties of polydimethyl siloxane have been studied by dynamic and creep methods, between −49° and 75°C, and from a maximum frequency of 600 cycles/sec.

TL;DR: In this paper, the bridging mechanism of polymer flocculation is investigated and the model is extended to include the effect of agitation on the adsorption of polyacrylamide and subsequent flocculations.

TL;DR: In this article, the relationship between the overall composition of two micelle-forming components and the critical micelle concentration on the one band and the composition of the mixed micelles on the other is reviewed and activity coefficients introduced to account for the behavior of real systems.

TL;DR: In this article, an instrument was constructed to measure the intensity of light scattered at various angles from a single droplet of dioctyl phthalate of about one micron radius or larger, illuminated by radiation of 436 millimicrons wavelength.

TL;DR: In this article, the effects of sucrose on protein films are studied as spread monolayers and as films adsorbed from solution, together with some bulk foam measurements, which is also relevant to certain technological systems in which foams and emulsions are stabilized by proteins in the presence of sugars.

TL;DR: In this article, the preparation of sols of silver bromide and silver iodide with a high degree of monodispersity is described, and the methods employed utilized the dilution of silver halide complex solutions with distilled water, in both the excess halide and excess silver regions.

TL;DR: In this paper, a method for the use of the maximum bubble pressure method of measuring surface tension, to measure dynamic surface tensions of solutions of slowly diffusing soluble molecules, is presented for aqueous solutions of decanoic acid and decyl alcohol.

TL;DR: In this article, the authors measured the differential capacity of the double layer on a mercury water interface in the presence of polyvinyl pyridine (2 P.V.P.) and poly 4-vinyl polyidine (4 P.P.V.).

TL;DR: In this article, the optical properties of films of Ba-Cu-H stearate formed by successive monolayer transfer from the air-water interface to a solid carrier have been studied by two methods: (a) the Hartman method, which gives thickness and refractive index of stepped multilayers for an incident s-ray, and (b) the Mattuck method, where the thin film increments upon a suitable multilayer carrier.

TL;DR: In this article, a method for continuously monitoring the rate of desorption of stearic acid from a planar surface is reported, which is based on the classical decay equation φ = φ E (1 − e − kt ) at 3°C.

TL;DR: In this paper, the authors show that in order that there be only one nonzero component of the stress tensor for a non-Newtonian fluid in a cone-plate viscometer, inertial forces must be neglected with respect to viscous forces in the equation of motion.