Bridging Flocculation by Polymers

Hogg, R.

doi:10.14356/kona.2013005

Cited by 53 publications

(28 citation statements)

References 26 publications

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“…Complex flocculation occurs when solid components attach to each other in a multistep sequence of different single flocculation mechanisms. Also, the patching and the bridging flocculation can occur together as a combined patch‐bridge flocculation . The typical negative surface charge of pulp fibers of −20 mV to −25 mV, when submersed in water, is attributed to the presence of ionizable functional groups present in the fibers, e.g., carboxylic acid groups or sulfonic acid groups …”

Section: Design and Manufacturing Of Highly Filled Papersmentioning

confidence: 97%

“…a) A schematic of two basic flocculation mechanisms: the patch flocculation between the surfaces of two idealized particles with opposite charges (top part of the schematic) and the bridging flocculation between particles connected by polymer chains (according to refs. ). b) A schematic of a complex flocculation mechanism: Pulp fibers and filler particles, which are first covered by a cationic binder, then exposed to shear stresses and covered by anionic microparticles.…”

Section: Design and Manufacturing Of Highly Filled Papersmentioning

confidence: 99%

“…When the cationic binder is dissected into smaller chains by applied shearing forces, anionic microparticles help to reconnect the broken‐up chain segments of the cationic binder (according to refs. ).…”

Section: Design and Manufacturing Of Highly Filled Papersmentioning

confidence: 99%

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Highly Filled Papers, on their Manufacturing, Processing, and Applications

et al. 2019

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Since more than a decade ago, the research on highly filled papers, as well as paper-derived inorganic materials, has greatly intensified. As presented in this review, highly filled papers as preforms allow for the design of porous or dense, multilayered, and geometrically complex structures. These paperderived ceramic-or metal-based materials are generated by the heattreatment of highly filled papers. Paper-derived materials are potential materials of choice for applications in transportation, energy-generation, environmental conservation, support structures, medical uses, and electronic components. Due to the adjustability of the filler content and the good machinability of highly filled papers, paper-derived sheets or multilayers may include intricate structures and tailored gradients in phase structure or porosity. Paper-derived multilayers also may contain cast ceramic tapes or other functionalized layers, as presented in some examples. Computer-aided manufacturing processes for paper-derived materials can be supplemented by prediction models for the sintering shrinkage in order to identify optimal post-processing steps, stacking orders and orientations for highly filled paper layers within multilayer green bodies. The accuracy of established component-level sintering models can be significantly increased by microstructure models of the highly filled paper. ParameterName Unit α Mismatch parameter for fiber cross-sections, Equation (5) Dimensionless α p Layer position in viscoelastic paper structure model, Equation (2) Dimensionless A 0 Initial amplitude of perturbation, Equations (15) 10 À6 m A(f) Parameter for evolution of instantaneous carbon conversion rate, Equation (7) Dimensionless A diff Source controlled diffusion parameter, Equations (9) 10 À7 N A match Modeling parameter, Equations (8) Dimensionless a Inter-particle contact-area radius, Equations (19) 10 À8 m a Local average pore area, Equation (4) 10 À6 m 2 b Pore geometry constant, Equation (20) Dimensionless ß evo , m evo Empirical constants for grain evolution in SOVS model, Equation (8) Dimensionless ß r(c)p Proportionality constant for bimodal packing fraction determination, Equation (18) Dimensionless C Modeling constant for debindering pressure calculation, Equation (7) 10 À6 (m 2 Á s)/K C 1 , C 2 , C 3 , C 4 , C 5 Parameters in the Riedel model that are determined by the dihedral angle, Equations (9) Dimensionless c glue Heat capacity of the adhesive layers, Equation (3) 10 À6 s c L , c s Volume fraction of larger-sized/smaller-sized particles in a multimodal mixture of particles, Equation (17)and (18) 10 0 vol% c vol Volume concentration of pulp fibers, Equation (4) 10 0 vol% γ, γ 0 Strain relaxation rate of calendered paper with initial value, Equation (2) Dimensionless γ B Grain boundary energy density, Equation (13) 10 0 J m À2 γ b Specific energy for grain boundary diffusion, Equation (9) 10 3 J mol À1 γ S Material surface energy, Equation (8, 11, and 13) 10 0 J m À2 Δ Half of the inter-particle boundary thickness, Equation (19) 10 À8...

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Section: Design and Manufacturing Of Highly Filled Papersmentioning

confidence: 97%

Section: Design and Manufacturing Of Highly Filled Papersmentioning

confidence: 99%

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Highly Filled Papers, on their Manufacturing, Processing, and Applications

et al. 2019

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“…The addition of polymers to the emulsions may result in flocculation by depletion or bridging. Bridging flocculation occurs when polymer molecules adsorb simultaneously on more than one drop (Hogg 2013;Różańska et al 2013). The polymers used in the study do not adsorb on the surface of oil droplets, so in the emulsions shown in Fig.…”

Section: Structure Of Emulsionsmentioning

confidence: 99%

Flow of Emulsions Stabilized by Polymers Through Packed Bed

Różańska

Różański

2019

Transp Porous Med

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In this study, we present the results of measurements of pressure drops during the flow of emulsions stabilized by carboxymethylcellulose sodium salt (NaCMC), xanthan gum (XG) and poly(ethylene oxide) (PEO) through a packed bed of glass spheres. The concentration of dispersed phase ranged from 10 to 50 vol% and consisted of flocculated droplets with diameters much smaller than the pore size. Highly flocculated emulsions with the addition of NaCMC were yield-stress fluids whose flow curve can be described by the Herschel-Bulkley equation. An empirical model was formulated for Herschel-Bulkley fluids which allows predicting pressure losses during their flow through a packed bed. In this model, the friction factor was made dependent on the Reynolds number proposed by Kembłowski and

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“…There are many factors affecting flocculation of suspension by use of polymer flocculants, such as molecular weight of the polymer, its constituent monomer species and their combination, its concentration in a target colloidal system, the affinity between polymer and colloidal particles, and solution environment (pH, ionic strength, etc.) (Gregory, 1973;Ash and Clayfield, 1976;Higashitani and Kubota, 1987;Adachi et al, 1994;Hogg, 2013). Therefore, it is difficult to evaluate the actual flocculation process quantitatively.…”

Section: Introductionmentioning

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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Bridging Flocculation by Polymers

Abstract: A comprehensive evaluation of flocculation processes is presented with emphasis

Cited by 53 publications

References 26 publications

Highly Filled Papers, on their Manufacturing, Processing, and Applications

Highly Filled Papers, on their Manufacturing, Processing, and Applications

Flow of Emulsions Stabilized by Polymers Through Packed Bed

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

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