Flocculation properties of some water-soluble cationic copolymers toward silica suspensions: A semiquantitative interpretation of the role of molecular weight and cationicity through a “patchwork” model

Mabire, Frederic; Audebert, R.; Quivoron, Claude

doi:10.1016/0021-9797(84)90280-7

Cited by 146 publications

(86 citation statements)

References 16 publications

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“…The capacitive currents of the cationic copolymers become progressively higher as their charge densities increase, indicating that their effectiveness in replacing chloride ions from the surface decreases. Adsorption of positively charged polymers onto a positively charged surface has been reported previously (1). There the adsorption is not electrostsatic, but is the non-specific (dispersion forces) kind of bonding shown by non-ionic polymers.…”

Section: Resultsmentioning

confidence: 78%

A tensammetric study of the adsorption of cationic polymers and copolymers

Smith‐Palmer¹,

Roberts²

1991

Can. J. Chem.

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Section: Resultsmentioning

confidence: 78%

A tensammetric study of the adsorption of cationic polymers and copolymers

Smith‐Palmer¹,

Roberts²

1991

Can. J. Chem.

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“…The charge neutralization of colloidal particles or the formation of polymer bridges between more than two particles is recognized as main mechanisms to induce colloidal flocculation [3][4][5][6][7][8][9]. Both mechanisms are induced by the adsorption of polyelectrolyte to the colloidal surface, which is taking place in the mixing flow.…”

Section: Introductionmentioning

confidence: 99%

Initial stage of bridging flocculation of PSL particles induced by an addition of polyelectrolyte under high ionic strength

Adachi

Xiao

2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Dynamics of colloidal flocculation of polystyrene latex (PSL) particles induced by cationic polyelectrolyte was studied in order to evaluate the effective layer thickness of adsorbing polyelectrolyte under sufficiently high ionic strength, where charges in polyelectrolyte chains are substantially shielded. The size of polyelectrolyte in the solution, a p , was evaluated by the viscometry and by dynamic light scattering (DLS). Normalizing method of end-over-end rotation was adopted to analyze the initial-stage dynamics of flocculation. Rate of coagulation of monodispersed PSL particles induced by simple salt monitored by the Coulter Counter confirmed to be proportional to the initial number concentration, thus validating the method of analysis. Drimethylamino ethylmethacrylates with nominal molecular weights of 4.9 million and 2.0 million were tested as flocculants. In contrast to coagulation with a simple salt, the rate of flocculation just after the onset of mixing with polyelectrolyte was remarkably enhanced and then decreased or stopped abruptly after certain period. The protruding length of polyelectrolyte obtained from the enhancement of the rate of flocculation in the first stage, δ He , was found to be several times larger than the size of polyelectrolyte in bulk solution determined by viscometry and DLS. Stretched conformation of polyelectrolyte chain in the mixing flow condition is the reason for the formation of apparently thick adsorbed polyelectrolyte layer.

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“…On the other hand, is it also expected by screening effects to reduce the electro-attractive interactions between the charged flocculant and the oppositely charged particles and thus strongly affect the flocculation rate and polymer efficiency. The presence of salt is also expected to play a role on the flocculant conformations by promoting, for example, polymer folding and collapse [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Salt concentration influence on the efficiency of two cationic polymeric flocculants

Palomino

Hunkeler²,

Stoll

2012

Colloid Polym Sci

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The influence of the increase of the solution ionic strength on the flocculation of charged latex particles in the presence of cationic polymers is reported. Empirical flocculation rate constants are experimentally determined using particle counting and for two cationic polymers, one linear and the second with two branches. Comparisons are made with a solution containing monovalent salt only at different ionic concentrations in the absence of polymers. In all cases, polymer-induced flocculation is significantly more efficient than charge screening effects using salt only. Analysis of zeta potential measurements indicates that the charge neutralization and surface charge variations dictate the stability of the latex suspensions. Moreover, the addition of a small amount of salt in the polymer-particle mixtures results in a dramatic decrease of the polymer efficiency which is more pronounced for the linear polymeric flocculant. By increasing further the ionic strength, the rates of polymer flocculation are found to increase again but remain smaller than in the absence of salt.

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Flocculation properties of some water-soluble cationic copolymers toward silica suspensions: A semiquantitative interpretation of the role of molecular weight and cationicity through a “patchwork” model

Cited by 146 publications

References 16 publications

A tensammetric study of the adsorption of cationic polymers and copolymers

A tensammetric study of the adsorption of cationic polymers and copolymers

Initial stage of bridging flocculation of PSL particles induced by an addition of polyelectrolyte under high ionic strength

Salt concentration influence on the efficiency of two cationic polymeric flocculants

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