Polydispersity and Functional Group Distribution of Dispersant Polymer: Adsorption Properties and Magnetic Paint Dispersion

Soga, Iwao

doi:10.1006/jcis.2001.7681

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…Polymer adsorption/desorption on/from colloids has been extensively involved in both industrial and biomedical applications, such as flocculation, , coating, and drug delivery . Different from small molecules, polymer adsorption/desorption, especially those nonspecific protein adsorption/desorption, usually does not produce much detectible spectroscopic changes; therefore, characterization of polymer adsorption/desorption on/from colloidal particles is often based on the consequences caused by the density distribution changes of polymer segments upon adsorption/desorption, such as changes in hydrodynamics, sedimentation, diffusion, and scattering.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Polymer Desorption from Colloids Probed by Aggregation-Induced Emission Fluorophore

et al. 2018

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Polymer adsorption and desorption are fundamental in many industrial and biomedical applications. Here, we introduce a new method to monitor the polymer desorption kinetics in situ based on the behavior of aggregation-induced emission. Poly(ethylene oxide) and colloidal silica (SiO) were used as a model system. It was found that the aggregation-induced emission method could be successfully used to determine the polymer desorption kinetics, and the polymer desorption followed the first-order kinetics. It was also found that the polymer desorption rate constant decreased with the increasing molecular weight, which could be described by a power law function k ≈ M, close to that of the adsorption rate constant.

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Section: Introductionmentioning

confidence: 99%

Kinetics of Polymer Desorption from Colloids Probed by Aggregation-Induced Emission Fluorophore

et al. 2018

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“…Consequently, slime coatings can be suppressed or even completely eliminated. Fundamental understanding of polymeric dispersant structure-dependent adsorption behaviour is critical for judicious selection or tailoring of polymer structures for an enhanced mineral dispersing efficiency (Dasgupta, 1991;Israelachvili, 1991;Nsib, 2006Nsib, ,2007Soga, 2001;Somasundaran, 2003;Tjipangandjara, 1990).…”

Section: Slime Coating Mitigationmentioning

confidence: 99%

Slime coating mitigation on mineral surfaces in froth flotation by saline water

Zhao¹

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Fine and ultra-fine particle flotation is central to the mining industry as a result of the need to treat low grade and difficult ores which require fine grinding to liberate valuable minerals from gangue minerals. However, the flotation of fine and ultra-fine particles is not efficient and a slime coating with slime gangue particles attaching to valuable minerals is one of the most popular barriers. A slime coating prevents the adsorption of collectors on the surface of valuable minerals resulting in low flotation recovery or low product quality.Saline water is also an important issue in the mining industry. In Western Australia, bore water with a high ionic strength has to be used at mine sites for production, site rehabilitation, and downstream processing because fresh water is not available locally. In Queensland, most mine sites have adopted water re-use as a means for making freshwater savings. However, water re-use results in increased salinity in site water stores, which is driven largely by evaporation and ongoing salt inputs from spoil, minerals and groundwater. Flotation relies on a large amount of water and therefore the impact of saline water on flotation performance has gained more and more attention.In this research, the role of saline water in the mitigation of slime coatings was studied and a generic approach to improve fine and ultra-fine particle flotation by using saline water was developed, building on the previous research. A model slime coating system was established by using copper minerals in the presence of clay particles. It was found that chalcocite flotation was depressed in the presence of bentonite slimes while chalcopyrite flotation was less affected.Electrostatic interactions between copper minerals and clay particles were found to be responsible for the different flotation of chalcocite and chalcopyrite in the presence of clay minerals. It was found that surface oxidation occurred during II grinding and changed the surface properties of chalcopyrite and chalcocite.Chalcocite was strongly oxidized while chalcopyrite was slightly oxidized after the grinding with stainless steel media. The different extent of surface oxidation resulted in the different electrical property of chalcocite and chalcopyrite surfaces.The strongly oxidized chalcocite surface became positively charged after grinding at the same pH and electrostatically attractive to bentonite particles resulting in the depressed chalcocite flotation. In contrast, the slightly oxidized chalcopyrite surface remained negatively charged after grinding at pH 9.0 and entropically repulsive from bentonite slime particles. Therefore, bentonite slimes did not influence chalcopyrite flotation as much as chalcocite flotation.Mitigation of slime coatings on chalcocite in flotation by using electrolytes was further investigated and kaolinite was used to introduce the slime. The results indicated that in tap water, the presence of kaolinite slimes depressed chalcocite flotation. With the addition of electrolytes to the flotation...

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Impact of functional group distribution on the adsorption of a polymeric dispersant

Soga

2003

J. Coatings Tech.

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Polydispersity and Functional Group Distribution of Dispersant Polymer: Adsorption Properties and Magnetic Paint Dispersion

Cited by 6 publications

References 21 publications

Kinetics of Polymer Desorption from Colloids Probed by Aggregation-Induced Emission Fluorophore

Kinetics of Polymer Desorption from Colloids Probed by Aggregation-Induced Emission Fluorophore

Slime coating mitigation on mineral surfaces in froth flotation by saline water

Impact of functional group distribution on the adsorption of a polymeric dispersant

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