Publications by authors named "Alain Foissy"
This study demonstrates the influence of a cationic surfactant on colloidal particle electrodeposition (migration and adhesion). Three cetyltrimethylammonium salts (CTA+) with various counterions (bromide, chloride, and hydrogenosulphate) were studied. Particle transport toward the electrode was driven by the electrophoretic force.
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- The study investigated how rinsing affects the stability of self-assembled polyelectrolyte films made from poly(allylamine hydrochloride) (PAH) and poly(styrene sulfonate) (PSS).
- Rinsing at a pH of 9 (same as the film buildup) kept the films stable, whereas rinsing at higher pH levels caused significant polymer release, leaving only a PAH monolayer.
- Thicker films (4+ bilayers) remained stable at lower pH, but stability of thinner films varied; films with PSS on top stayed stable, while those with PAH released more material.
The removal of divalent metal ions from hard waters or galvanic wastewater by polymer-assisted membrane filtration using alginate was investigated. The ability of this natural polymer to form aggregates and gels in presence of metal ions was studied, in order to carry out metal removal by ultra or micro-filtration. Alginate titrations have shown the presence of amine groups in addition to carboxylates onto the polymer backbone.
View Article and Find Full Text PDFAdsorption of barium and calcium chloride onto negatively charged alpha-Fe(2)O(3) particles.
J Colloid Interface Sci
November 2002
Adsorption of cations (Na(+), Ca(2+), Ba(2+)) onto negatively charged (pH 10.4) hematite (alpha-Fe(2)O(3)) particles has been studied. The oxide material was carefully prepared in order to obtain monodisperse suspensions of well-crystallized, quasi-spherical particles (50 nm in diameter).
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