ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScanning of the Cationic Surfactant Adsorption on a Hydrophilic Silica Surface at Low CoveragesJ. L. Trompette, J. Zajac, E. Keh, and S. PartykaCite this: Langmuir 1994, 10, 3, 812–818Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.org/doi/10.1021/la00015a036https://doi.org/10.1021/la00015a036research-articleACS PublicationsRequest reuse permissionsArticle...

The influence of the alkyl chain length and concentration exchangeable sodium cations at solid/water interface on energetics cationic surfactant adsorption a hydrophilic silica surface free pH has been studied. Adsorption isotherms, electrophoretic mobilities particles, differential molar enthalpies displacement for benzyldimethyldodecylammonium bromide (BDDAB) original sample (SilNa) different ionic strengths (pure deionized water 0.1 M NaBr solution) were compared, as well those washed...

The particle separation efficiency by flotation sharply decreases or even completely fails when the diameter of dispersed particles falls into nanoscale. In present laboratory work, humic acid was used to enhance removal TiO2 nanoparticles from suspension in a chemical coagulant-free dissolved air process. Without acid, merely 63.8% were removed. For acid-assisted flotation, pH solution significantly influenced efficiency: more than 90% could be separated stock acidic; however, basic...

The influence of the nature three representative monovalent co-ions on gelation kinetics Ludox suspensions has been investigated. At a given volume fraction and for same concentration potassium salt, time is longer as studied anion presents more pronounced kosmotrope character. As screening silica surface charge similar since cationic counterion taken, these results highlight unexpected role played by hydration effects imparted when particles are pushed together proceeds. This reveals that...

The rheological behavior of two hydrogels, poly(sodium acrylate) and polyacrylamide gels, synthesized in the presence same crosslinking agent molecule, N,N′-methylene bis-acrylamide, has been investigated. variation norm complex shear modulus |G*| vs. monomer concentration (sodium acrylate or acrylamide) exhibited a different power law, depending on nature molecule. This discrepancy was ascribed to influence properties molecules crosslinked structure gelified networks. analysis experimental...

The aggregation kinetics of negatively charged polystyrene latex particles in the presence monovalent electrolytes have been investigated. inferred coagulation critical concentrations were compared to establish stability sequence. With same representative co-ions, this sequence is reversed when using kosmotrope sodium and chaotrope potassium cations. results ascribed a variable competition co-ions toward hydrophobic surface depending on lyotropic nature associated counterion. They provide...

Calorimetric measurements of adsorption for the surfactant (benzyldimethyldodecylammonium bromide) and its polar head-group (benzyltrimethylammonium from aqueous solutions on two different silica surfaces (hydrophilic hydrophobic one) allow a more detailed picture subsequent stages process to be drawn. It is possible determine precisely boundary between individual molecules formation surface aggregates. The local disruption structure interfacial water by cations gives an endothermic...

Comparative electrodeposition of iron onto the surface silicon was investigated at large overpotential in presence some base electrolytes. The nanostructure electrodeposits analyzed with SEM and FE-SEM measurements. results highlight influences ion specificity on rate hydrogen evolution selective adsorption morphology electrodeposits.

Comparative electrolysis experiments were performed at platinum electrodes in the presence of some aqueous salt solutions a concentration 0.3 M and same imposed electrical potential, i.e., −1500 mV/SCE. A characteristic coalescence behavior, which is called "train coalescence", was observed when ammonia gas either electrogenerated from ammonium or directly dissolved specific electrolytes.