Showing papers in "Journal of Colloid and Interface Science in 2000"

TL;DR: A new mathematical model was developed for the filtrate flux which accounts for initial foulingDue to pore blockage and subsequent fouling due to the growth of a protein cake or deposit over these initially blocked regions, eliminating the need to use different mathematical formulations to describe these two phenomena.

TL;DR: A model that more accurately describes the size of an asperity based on the measurable parameters of root-mean-square (rms) roughness and the distance between the asperities is derived and is compared to the experimentally determined force of adhesion in systems with nanoscale roughness.

TL;DR: In this article, a model that more accurately describes the size of an asperity based on the measurable parameters of root-mean-square (rms) roughness and the distance between the asperities is derived.

TL;DR: This work shows that the stability behavior of Na-montmorillonite colloids cannot be satisfactorily reproduced by DLVO theory, using the surface parameters experimentally obtained, and is unable to explain their pH-dependent stability behavior caused by the small charge at the edge sites.

TL;DR: The Co(2+) ion doping not only enhanced the photocatalytic activity under ultraviolet-visible (lambda>300 nm) light irradiation but also induced the visible light ( lambda>400 nm) response.

TL;DR: Batch sorption experiments performed on Cr(VI) species sorption showed a significantly enhanced removal of inorganic hexavalent chromium anionic species from aqueous solution by montmorillonite clays modified with quaternary amine, hexadecyltrimethylammonium (HDTMA) bromide.

TL;DR: The experimental results are found to be accurately described over a large range in spheres velocity and liquid viscosity by a simple closed-form expression, and the bridge rupture distance is found to increase like the square root of the separation velocity.

TL;DR: The results emphasize the importance of electrostatic interactions in both adsorption processes, and the forces that attract hydrophobic side chains toward the protein-clay interface are large enough to distort peripheral amphiphilic helical domains.

TL;DR: In this article, a method for distinguishing between the two processes based on the change in zeta potential with increasing adsorption was presented, where the transition point from ad-sorption to surface precipitation was determined by using surface coverages.

TL;DR: The viscous behavior of oil-in-water (O/W) emulsions is studied over a broad range of dispersed-phase concentrations (φ) using a controlled-stress rheometer to derive viscosity data of Newtonian and non-Newtonian emulsion types.

TL;DR: To prepare the monodispersed solid lipid microspheres a temperature-controlled microchannel (MC) emulsification process was devised and the experimental results are discussed using the new mechanism of droplets formation which is caused by the interfacial tension.

TL;DR: In this article, the hydrophobic recovery of polydimethylsiloxane elastomers was studied after exposure to partial electrical discharge, and it was shown that the recovery rates of the oxidized extracted samples are strongly influenced by the applied voltage, humidity, and aging condition.

TL;DR: Measurements of liquid entry pressure measurements are applied to study the hydrophobicity of microporous membranes for aqueous alcohol solutions and the maximum concentration before the spontaneous wetting occurs would be predicted.

TL;DR: This is the first investigation of the molecular structure of Glu and Asp species adsorbed on amorphous TiO(2) using in situ ATR-IR spectroscopy, and application of the Langmuir model to adsorption isotherms yields a single binding constant for Asp and two binding constants for Glu, further supporting the evidence for different Adsorbed Glu species.

TL;DR: It is feasible to produce high-quality microporous activated carbon from corn cob agrowaste using N( 2) carbonization followed by physical activation with CO(2) or steam.

TL;DR: Possibility of encapsulating macromolecules in defined amounts per capsule are discussed andAlternating adsorption of multivalent ions and oppositely charged polyelectrolytes on colloid particles has been investigated.

TL;DR: It was shown that the adsorption of both phenols and 3-chlorophenol could be fitted to a pseudo-second-order rate law, and that of both dyes could befitted to an intraparticle diffusion model.

TL;DR: In this paper, the streaming potential technique is utilized to measure the ζ-potential of glass surface in contact with a variety of aqueous solutions A flow cell made of a parallel-plate microchannel is devised to conduct the stream potential measurements Particular efforts are made to characterize the well-recognized effect of surface conductance and to determine its role in the electrokinetic phenomenon.

TL;DR: FTIR and X-ray diffraction data suggest that the aggregate responsible for gel is an assembly of hydrogen-bonded molecular ladders, which are initially formed from numerous molecules through intermolecular hydrogen bonding, and finally immobilize organic fluids.

TL;DR: The zeta potentials of bubbles with ordinary cationic and ionic surfactants are consistent with others' previous results, and for nonionic AG, a possible charging mechanism based on known mechanisms is suggested to explain the negative charge.

TL;DR: This article presents a versatile, rigorous, and efficient methodology for extracting various geometric and topological parameters of 3D discrete porous media using the morphological skeleton of the pore structure, derived by a fully parallel thinning algorithm.

TL;DR: In this article, the authors examined the local molecular coordination of strontium in the extended X-ray absorption fine structure (EXAFS) of kaolinite, amorphous silica, and most goethite sorption samples with a single first shell of 9-10 (+/-1) oxygen atoms around strontius at an average Sr-O bond distance of 2.61 (+/-0.02) A, indicating hydrated surface complexes.

TL;DR: The interaction of methyl violet, a cationic dye, with various surfactants, viz. anionic (SDS), nonionic (Triton X-100), and cationIC (CTAB), has been investigated spectrophotometrically in submicellar and micellar concentration range.

TL;DR: In this paper, stable nanosize gold and silver particles are spontaneously formed by reduction of aqueous metal salt solutions in the presence of sugar-persubstituted poly(amidoamine) dendrimers (sugar ball).

TL;DR: Analysis of the F(-) data with the CD-MUSIC approach shows that the formation of the fluoride surface complex is accompanied by a redistribution of charge, which is approximately equivalent with the change of a donating H bond into an accepting H bond.

TL;DR: In this paper, the authors describe the characterization of these well-organized aggregates and propose a mechanism for the influence of the hydroxypropylmethylcellulose (HPMC) on the crystallite and aggregate shape.

TL;DR: It was observed that the ECs were adhered more onto the positions with moderate hydrophilicity of the wettability gradient surface than onto the more hydrophobic or hydrophilic positions.

TL;DR: Surfactants with more hydrophilic headgroups exhibited higher CAC, though this trend was moderated by the alkyl chain length, and comparing the chemically synthesized sucrose esters with their enzymatically synthesized equivalents revealed only minor differences in the CAC and the surfactant efficiency.

TL;DR: A model to determine the electrical potential and ionic concentration distributions in the overlapped EDL fields between two infinitely large flat plates was developed after it was found that the treatment in the classical theory may lead to an inaccurate description due to the misuse of the Boltzmann equation.

TL;DR: The dynamics of migration of the sorbate ions from the bulk onto the sorbent surface was studied and the results obtained under various experimental conditions were found to follow standard adsorption isotherms.