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Article
Surface modification of colloidal silica particles
Colloidal silica particles in organic solvents were grafted, using several reagents, in order to make them hydrophobic. The hydrophobicity of the beads could be easily varied. Quasielastic light scattering an...
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Article
Structural evidence of charge renormalization in semi-dilute solutions of highly charged polyelectrolytes
We show experimentally that Manning counterion condensation also leads to a renormalization of the charge density at high concentrations of highly charged, flexible, hydrophilic polyelectrolytes. Investigation...
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Article
Highly hydrophobically modified polyelectrolytes stabilizing macroemulsions: relationship between copolymer structure and emulsion type
The types of emulsions, oil (n-dodecane) in water (O/W) or water in oil (W/O), stabilized with highly hydrophobically grafted linear poly(sodium acrylate)s, were investigated as a function of polymer chemical ar...
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Article
Highly hydrophobically modified polyelectrolytes: Field variables to control emulsion type
Highly hydrophobically modified (with n-dodecylamide chain) linear poly(acrylic acid)s (HHMPAAH) and poly(sodium acrylate)s (HHMPAANa) with various degrees of grafting (τ) were synthesized and used as emulsifier...
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Chapter and Conference Paper
Emulsions stabilized with hydrophobically modified poly(acrylic acid)
Hydrophobically Modified (with alkylamide chain) linear Poly(acrylic acid) Sodium Salt (HMPAANa) of various degree of grafting (τ) and alkyl chain length (n) were synthesized and used as emulsifiers of n-dodecane...
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Chapter
Mechanisms of flocculation and stabilisation of suspensions by organic polymers
Disperse systems are encountered in a wide variety of fields, especially in the chemical industry where they can be used as end products (paints, printing inks, drilling muds, cosmetics, agrochemical or pharma...
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Article
Coupling between polymer adsorption and colloidal particle aggregation
Studies of the adsorption of high molecular weight polymers on colloidal latex and silica particles and their subsequent flocculation were carried out. Neutral polyethylene oxide samples with both a narrow and...
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Article
Rheological behavior of moderately concentrated silica suspensions in the presence of adsorbed poly(ethylene oxide)
Adsorption and flocculation properties have been investigated for a well-characterized aqueous system of precipitated nanometric silicabeads in the presence of a high molecular-weight poly(ethylene oxide). Par...
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Article
Reversible flocculation of silica suspensions by water-soluble polymers
The possibility to concentrate, then redisperse colloidal suspensions is not only of great theoretical interest, but is also relevant to the industrial process of solid-liquid separation, which must often be f...
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Article
13C NMR spectroscopy of cationic copolymers of acrylamide
Random copolymers of acrylamide and a quaternary ammonium acrylate monomer have been investigated by13C NMR spectroscopy in aqueous solution. Cleavage of the ester function has been shown to occur in mild alkalin...
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Article
Short range order of silica particles bound through adsorbed polymer layers
Small angle neutron scattering was used to examine the organization of silica spheres which had been flocculated by various cationic copolymers. When the adsorbed polymers bound the spheres without compensatin...
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Chapter
Sol—Gel Transition Induced by Friedel—Crafts Crosslinking of Polystyrene Solutions
Friedel—Crafts crosslinking of polystyrene has been performed with 9,10-dichloromethylanthracene (A(MC)2) in 1,2-dichloroethane solution. The extent of the reaction is followed by UV spectroscopy. The number of c...
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Chapter and Conference Paper
Adsorption of cationic polyelectrolytes at clay-colloid interface in dilute aqueous suspensions — effect of the ionic strength of the medium
The behavior of dilute clay colloids/cationic copolymers systems is investigated as a function of the ionic strength I of the medium for various charge levels of the polyelectrolyte chain. Changing I not only ...
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Chapter
Galactomannan—Borate Systems: A Complexation Study
We study the formation of weak reversible gels of galactomannans induced by borate complexation. Phase diagrams observed in water and in 1M NaCl are presented. To obtain information about the crosslinking mech...
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Article
Evidence by light scattering of hydroxyethylcellulose aggregation induced by solution filtrations
It is reported from light-scattering results that a thermoreversible aggregation may occur when hydroxyethylcellulose (HEC) solutions are filtered. The aggregation extent depends on concentration and filter po...
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Article
Light-scattering studies of hydroxyethylcellulose in water/nonionic surfactant binary mixtures
The following paper reports the occurrence of interactions in nonionic polymer (hydroxyethylcellulose : HEC)/nonionic surfactant (polyethylene oxide nonyl phenyl ether) systems through light-scattering studies...
