Kinetics of polyelectrolyte adsorption onto polystyrene latex particle studied using electrophoresis: Effects of molecular weight and ionic strength

Aoki, Kenji; Adachi, Yasuhisa

doi:10.1016/j.jcis.2006.03.027

Cited by 48 publications

(45 citation statements)

References 25 publications

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“…With respect to polymer molecular weight, the shift in bubble zeta potential to less positive values was surprising as Aoki and Adachi (2006) had observed that the electrophoretic mobility of polystyrene latex particles with adsorbed fully quaternised polyDMAEMA was constant, regardless of the polymer molecular weight. However, the adsorption of polymers onto bubbles may be inhibited not only by steric interferences in the case of high molecular weight polymers, but also by electrostatic repulsion in areas where cationic unimers have adsorbed to form areas of high charge concentration.…”

Section: Bubble Coating With Hydrophobically Functionalised Polymersmentioning

confidence: 99%

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

et al. 2014

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Cyanobacteria Flotation PosiDAFWater soluble polymers a b s t r a c t Dissolved air flotation (DAF), an effective treatment method for clarifying algae/cyanobacteria-laden water, is highly dependent on coagulation-flocculation. Treatment of algae can be problematic due to unpredictable coagulant demand during blooms. To eliminate the need for coagulation-flocculation, the use of commercial polymers or surfactants to alter bubble charge in DAF has shown potential, termed the PosiDAF process. When using surfactants, poor removal was obtained but good bubble adherence was observed.Conversely, when using polymers, effective cell removal was obtained, attributed to polymer bridging, but polymers did not adhere well to the bubble surface, resulting in a cationic clarified effluent that was indicative of high polymer concentrations. In order to combine the attributes of both polymers (bridging ability) and surfactants (hydrophobicity), in this study, a commercially-available cationic polymer, poly(dimethylaminoethyl methacrylate) (polyDMAEMA), was functionalised with hydrophobic pendant groups of various carbon chain lengths to improve adherence of polymer to a bubble surface. Its performance in PosiDAF was contrasted against commercially-available poly(diallyl dimethyl ammonium chloride) (polyDADMAC). All synthesised polymers used for bubble surface modification were found to produce positively charged bubbles. When applying these cationic micro-bubbles in PosiDAF, in the absence of coagulation-flocculation, cell removals in excess of 90% were obtained, reaching a maximum of 99% cell removal and thus demonstrating process viability. Of the synthesised polymers, the polymer * Corresponding author.E-mail address: r.henderson@unsw.edu.au (R.K. Henderson). 1 Current address: School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.Available online at www.sciencedirect.com ScienceDirect journal h ome page: www.elsevier.com/loca te/watres w a t e r r e s e a r c h 6 1 ( 2 0 1 4 ) 2 5 3 e2 6 2 http://dx

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Section: Bubble Coating With Hydrophobically Functionalised Polymersmentioning

confidence: 99%

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

et al. 2014

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“…These rules of the flocculation model are based on some known facts such as: 1) a colloidal suspension is sometimes stabilized by the hydrophilic nature of polymer flocculant which excessively adheres to the particle surface (Fleer and Lyklema, 1974;Napper, 1977;Gregory and Barany, 2011); and 2) appearance of a lump of polymer flocculant leads to a decrease in bridging ability. However, this model does not consider the following phenomena which are encountered in practice: 1) breakage of flocs; 2) changes in flocculation rate due to the growth of the flocs (Higashitani et al, 1978;Tambo and Watanabe, 1984);, 3) changes in flocculation ability due to a combination of physical and chemical properties of particle and polymer; 4) changes in adsorption rate and adsorbed amount of polymer due to change of the flocculant morphology and its concentration (Black et al, 1966;Van de Ven, 1994;Aoki and Adachi, 2006;Gregory and Barany, 2011); and 5) flocculation by polymer flocculant other than bridging mechanism (Gregory, 1973;Gregory and Barany, 2011;Feng et al, 2015). Therefore, this model is restricted to systems where bridging is the predominant mechanism of flocculation.…”

Section: Model Simulation Of Bridging Flocculationmentioning

confidence: 99%

Effect of Intermittent Addition on Turbidity Removal by Polymer Flocculant: Computer Simulation of Simplified Flocculation Model

Kadooka

Miyajima

Tanaka

et al. 2018

J. Chem. Eng. Japan / JCEJ

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Since there are many factors which in uence the process of occulation by polymer occulant, the scienti c understanding of the occulation mechanism is still under discussion. We have proposed a simple bridging model which expresses occulation under various additive manners of the occulant and enables the understanding of qualitative trends of the occulation system. In the present study, from the simulated results based on the model and experimental data, we obtained the following knowledge: 1) the intermittent addition of polymer occulant gives better and reproducible turbidity removal; 2) the optimum dosage, which results in maximum turbidity removal in a given manner of addition, increases as the number of doses under the intermittent addition increases; 3) at a given amount of primary particles, the reproducibility at the optimum dosage of the 1-time dose is the worst among all results, irrespective of the additive manner. It could, therefore, be concluded that all these ndings are originating from the di erence of probability of bridging formation among particles under various additive manners.

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“…The explanation for the aforementioned results is given as follows. Under lower ionic strengths, polymer chains are rigidly adsorbed on the oppositely charged particles while they repel each other with strong electrostatic repulsion among charged segments, making both polymers and particles difficult to move as illustrated in Figure 27 [39][40][41]. In contrast, under the high ionic strength, that is, when polymer-particle electrostatic attraction and polymerpolymer repulsion are screened, adsorbed polyelectrolytes smoothly undergo reconformation and subsequently produced flocs easily rearrange their structures to have increased contact points.…”

Section: Monitoring Rearrangement Of Floc Structuresmentioning

confidence: 99%

Flocculation kinetics and hydrodynamic interactions in natural and engineered flow systems: A review

Oyegbile

Narra

2016

Environmental Engineering Research

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Dynamic behaviors of unstable colloidal dispersions are reviewed in terms of floc formation. Geometrical structure of flocs in terms of chemical conditions and formation mechanics is a key to predict macroscopic transportation properties. The rate of sedimentation and rheological properties can be described with the help of fractal dimension (D) that is the function of the number of contacts between clusters (N c ). It is also well known that the application of water soluble polymers and polyelectrolytes, which are usually used as a conditioner or flocculants in colloidal dispersions, critically affects the process of flocculation. The resulted floc structure is also influenced by the application of polymer. In order to reveal the roles of the polymers, the elementary rate process of polymer reaching to colloidal interface and subsequent reconformation process into more stable adsorption state are needed to be analyzed. The properties of permeable flocs and adsorbed polymer (polyelectrolyte) layers formed on the colloidal surfaces remain to be worked out in relation to inhomogeneous porous structure and electrokinetics in the future.

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Kinetics of polyelectrolyte adsorption onto polystyrene latex particle studied using electrophoresis: Effects of molecular weight and ionic strength

Cited by 48 publications

References 25 publications

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

Hydrophobically-associating cationic polymers as micro-bubble surface modifiers in dissolved air flotation for cyanobacteria cell separation

Effect of Intermittent Addition on Turbidity Removal by Polymer Flocculant: Computer Simulation of Simplified Flocculation Model

Flocculation kinetics and hydrodynamic interactions in natural and engineered flow systems: A review

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