Showing papers in "Colloids and Surfaces A: Physicochemical and Engineering Aspects in 1996"

TL;DR: In this paper, the authors present theories describing colloid mobilization, deposition, and transport, laboratory experiments in model systems designed to test these theories, and applications of these theories to colloid-facilitated transport experiments in natural groundwater systems.

TL;DR: In this article, the authors examined the adsorption of arsenic onto hydrous ferric oxide (HFO) for both As(III) and As(V) and compared the results with the results obtained using the generalized two-layer model (a surface complexation model in which the coulombic term is fixed by double layer theory).

TL;DR: In this article, a dynamic drop tensiometer is used to measure the viscoelastic modulus in compression/dilation of surfactant-covered interfaces, where a droplet a few mm in diameter is subjected to sinusoidal fluctuations of its volume.

TL;DR: A review of the application of fluorescence techniques to study polymer-surfactant systems can be found in this article, where various methods and materials in use are discussed, with particular emphasis on the study of the complexes formed between surfactants and hydrophobically-modified polymers.

TL;DR: In this paper, the authors discussed the significance of the line tension in three-phase systems and the contribution of the linear free energy to the energy of attachment (detachment) of fine particles at (from) an interface.

TL;DR: In this article, the scaling equation for the stretched-collapsed transition of a salted polymer brush was used to test the stability of a casein micelles in milk.

TL;DR: In this article, the authors explored the reversibility of virus attachment to mineral surfaces and showed that the attachment edge occurred at a pH value about 2.5-3.5 pH units above the pH of the mineral surfaces.

TL;DR: In this paper, an overview of the literature on shear and dilational rheology at liquid interfaces is presented, along with a discussion of specific theoretical aspects necessary to interpret experiments.

TL;DR: In this article, the surface phenomena which are derived are directional movement and assembly of fine colloid particles in thin liquid films were derived, and two distinct mechanisms were now postulated to explain this novel fabrication, (i) they are assembled by convective water flow, stimulated by evaporation at the boundary of the particle arrays (films), (ii) they were packed by the long-range attractive force acting between particles induced by surface tension at the film surface.

TL;DR: In this article, the effect of important parameters like solute concentration, detention time, pH, temperature, agitation rate and particle size of the adsorbent has been addressed and the process of uptake follows first-order kinetics and the data fit the Langmuir isotherm.

TL;DR: In this article, a general relationship between contact angle, corner angle, liquid saturation, and the curvature of a meniscus in the corner of an n-sided tube is derived.

TL;DR: In the case of divalent hydrotalcite compounds, the adsorbed quantity is larger than the A.E.C. as mentioned in this paper, which suggests that CrO42− precipitates at high equilibrium concentration.

TL;DR: In this paper, the authors show that the self-assembled monolayers are insensitive to the presence of water as they provide equal levels of protection in both dry and humid oxygen-containing atmospheres.

TL;DR: In this paper, some fundamental problems concerning equilibrium contact angles are discussed, including the modification of the Young equation for the intrinsic contact angle, the question of whether the actual contact angle is always identical with the intrinsic angle, and the mechanism of contact angle hysteresis.

TL;DR: In this article, a simple ion-binding model is presented to quantify the equilibrium adsorption of ionic surfactants at aqueous-fluid interfaces, and an analytic expression for the surface tension is obtained as a function of physicochemical parameters of the system.

TL;DR: In this paper, the authors present direct in situ X-ray absorption fine structure (XAFS) evidence for the presence of hexavalent chromium(III) at the surface of synthetic magnetite at near neutral pH.

TL;DR: In this article, a colloid transport model with source/sink terms for colloid release and deposition was used to fit the data for different ionic strengths, and fitted release rate coefficients were not sensitive to the ionic strength.

TL;DR: In this paper, the salt effect of NaCl on solutions of poly(ethylene oxide) (PEO) and sodium dodecyl sulfate (SDS) was investigated conductimetrically.

TL;DR: In this paper, a new theoretical approach has been developed which allows mixed kinetics of non-ionic surfactants to be studied in the unitary framework of an extended diffusion-controlled problem.

TL;DR: In this article, the degradative diffusion process was used to obtain uniform polymeric microspheres, with diameters ranging from 2.5 to 60 μm, by the ordinary suspension polymerization of either styrene(hydrophobic) or methyl methacrylate (MMA)-based monomers.

TL;DR: In this article, the critical micelle concentration (CMC) and surface tension at the CMC have been determined for the gemini surfactants alkanediyl-α,ω- bis (dimethylalkylammonium bromide) by means of dynamic surface tension measurements.

TL;DR: In this paper, an attempt is made to calculate the number and type of water molecules (whether non-freezing bound water or freezing bound water) adsorbed by the polar groups with counterions (H+, Na+, Ca2+) common in paper products.

TL;DR: The application of the Dubinin-Radushkevich (DR) and Dubin-Astakhov (DA) equations to the characterization and comparison of microporous solids has been studied in this paper.

TL;DR: Low-rate dynamic contact angles of 17 liquids on a carefully prepared solid surface (FC-722 dip-coated on a mica surface) were measured by axisymmetric drop shape analysis-profile as mentioned in this paper.

TL;DR: In this article, a model for snap-off of a gas thread in a constricted, cornered pore was developed and the time for wetting liquid to accumulate at a pore throat into an unstable collar was examined, as well as the resulting porespanning lens to be displaced from the pore so that snapoff may repeat.

TL;DR: In this article, the behavior of an associating hydrophilic/hydrophobic copolymer of acrylamide and alkyl methacrylate has been studied.

TL;DR: In this paper, the authors outline the current understanding of the drop size dependence of contact angles and line tension of solid-liquid systems and show that for a sessile drop on an ideal solid surface, the line tension is shown to be a positive quantity as required by the condition of stable thermodynamic equilibrium.

TL;DR: Using X-ray absorption spectroscopy (XAS), it was shown that at low pH and Na ion concentration Co(II) forms outer-sphere, mononuclear surface complexes with permanent-charge sites in the interlayer region of smectites as discussed by the authors.

TL;DR: The physical properties of hydrophobically modified polyurethane thickeners have been studied in solution as discussed by the authors, showing that the concentration dependence of the shear modulus of such solutions can be described by a simple model in which there is an interplay between chains taking up loop and link configurations.

TL;DR: In this article, the authors investigated the interaction between coagulants and organics in the absence of suspended solids and found that the removal of organics by coagulation is directly related to the molecular weight.