Showing papers in "Journal of Colloid and Interface Science in 1991"

TL;DR: In this paper, the steric repulsion free energy and van der Waals attraction free energy of polyethylene oxide (PEO) chains were calculated as a function of surface density and chain length of PEO.

TL;DR: In this article, a methodology to correlate the absolute surface concentration of protein to the surface plasmon resonance (SPR) response is described, and the thickness and the optical constants for each layer on the sensor chip used were determined with different optical techniques.

TL;DR: In this paper, the effect of surface density of polyethylene oxide (PEO) and protein size on protein resistance to protein adsorption has been studied, and the authors concluded that the longest chain length of PEO at optimum surface density appears best for protein resistance.

TL;DR: In this article, 3-Aminopropyl triethoxy silane (APTES) was deposited onto silicon oxide surfaces under various conditions of solvent, heat, and time, and then exposed to different curing environments, including air, heat and ethanol.

TL;DR: In this paper, the formation of uniform silica particles is investigated and rates of silicon alkoxide reactions are reported and linked to particle growth rates, which are consistent with a particle growth mechanism involving reactions occurring in solution that proceed independently of the presence of particles.

TL;DR: In this article, an aggregative growth model for the formation of uniform particles was developed and tested with rate and particle size distribution data gathered on spheres precipitated from silicon alkoxides.

TL;DR: In this article, the exact meniscus curvature of perfectly wetting liquids draining from pores of general triangular cross section was derived, where the appropriate normalized shape factor for capillary action in triangular pores is the ratio of the area of cross section, A to the square of the perimeter length, P.

TL;DR: In this article, critical micelle concentrations of petroleum asphaltenes were determined at 25°C in mixtures of n-alkanes and toluene using a calorimetric titration method.

TL;DR: In this article, a purification method based on the liquid-solid colloidal phase transition induced by attractive depletion interactions was proposed, which is very sensitive to particle size and can greatly extend the variety of monodisperse suspensions available.

TL;DR: The structural changes in horse cytochrome c, bovine ribonuclease A (RNase A), sperm whale myoglobin, ovalbumin, human hemoglobin, and bovines serum albumin during adsorption on ultrafine silica particles have been studied.

TL;DR: In this article, the dynamics of the formation of metal oxide agglomerates was studied by introducing metal containing salts of magnesium and zinc into a flat flame, and the distribution of the mobility equivalent diameter of the agglomers formed downstream from the flat flame were self-preserving.

TL;DR: In this article, the amphoteric properties of hydrous fluorapatite surfaces have been investigated using potentiometric titrations in 0.1 M NaCl medium at 25°C using a glass electrode.

TL;DR: A comparison of the ability of C6C18 carboxylic acids to stabilize aqueous magnetite fluids is made in this paper, where the particle surface area occupied per molecule of surfactant was found to range between ca. 21 and 38 A2.

TL;DR: In this article, phase analysis light scattering (PALS) is used to determine electrophoretic mobilities of polar and nonpolar colloidal dispersions down to 1 × 10−12 m2 s−1 V−1, with typical resolutions of 5% to 5% depending on the nature of the dispersion being studied.

TL;DR: In this article, the rate of approach and deformation of two small drops of different sizes in buoyancy-driven axi-symmetric motion is analyzed within the asymptotic limit of small capillary number, in which deformation becomes important only when the minimum separation between the drops is much smaller than either radius.

TL;DR: In this paper, the authors investigated the kinetics of capture of suspended colloidal particles in a packed bed of granular material in the presence of attractive double layer interactions and found that when attractive double-layer interactions extend to large distances from the collector surface, the transport of particles toward the collector increases beyond that of pure convective diffusion, and as a result, colloid deposition rates also increase.

TL;DR: In this article, a new procedure to purify nonionic amphiphiles (alkyl polyglycol ethers, C i E j ) was proposed, which utilizes the well-known phase behavior of ternary systems of water, oil, and non-ionic amphphiles to extract simultaneously water and oil-soluble impurities.

TL;DR: In this paper, the authors measured the interfacial mass transfer coefficients for the transfer of the proteins α-chymotrypsin and cytochrome c between a bulk aqueous and a reversed micellar phase using a stirred diffusion cell.

TL;DR: In this paper, a coprecipitation method and subsequent digestion process (below 100°C) was described. And the results showed that the particle size appeared to be a unique function of the ratio of metal ion concentration to hydroxide ion concentration when the digestion conditions were fixed.

TL;DR: In this article, the effect of particle interactions in a flocculated dispersion by measuring the elasticity mechanically and determining the network dimensionality by static light scattering has been investigated, showing that the dispersion changes from fluid to solid within a narrow temperature range, defining a gel transition boundary.

TL;DR: Keville et al. as mentioned in this paper developed an original scheme for producing monodisperse polymer microspheroids of precise size and shape by dispersion polymerization and cross-linked.

TL;DR: In this article, a model was proposed for the ripple structure and the ripple structures were shown to exist as single bilayers, which suggests that the structures observed may result from unbinding fluctuations that disrupt lamellar phases.

TL;DR: In this paper, the effect of octa ethylene glycol mono ndodecyl ether (C12E8) on the size, structure, and leakage of lipid vesicles has been examined by means of static and quasi-elastic light scattering, as well as with cryo-transmission electron microscopy.

TL;DR: In this article, the internal structure and growth rate of rigid flocs formed by rapid coagulation in a linear shear flow were investigated, examining structure by static light scattering and measuring sizes by dynamic light scattering.

TL;DR: In this article, the authors show that micelle-like surface aggregates of limited size are eventually formed when the density or energy of the adsorbing sites is low (case here of the nonionic surfactants but also of the anionic one at a pH where the surface charge is low).

TL;DR: In this paper, the authors examined the structure of latex spheres with aluminum coagulant and found significant alterations in the final floc characteristics depending upon the level of energy input during the short breakup step.

TL;DR: The structural transitions induced by addition of the nonionic surfactant C 12 E 8 (octaethylene glycol n-dodecyl monoether) to small unilamellar lecithin vesicles has been studied by means of static and dynamic light scattering as well as with cryo-transmission electron microscopy.

TL;DR: In this article, the hydraulic permeability of the protein deposit decreased with increasing filtration pressure, although the response to pressure variations was slow with a time constant of more than 100 min.