Effect of polyelectrolytes on the degree of flocculation of papermaking suspensions

Nasser, Mustafa S.; Twaiq, Farouq; Onaizi, Sagheer A.

doi:10.1016/j.seppur.2012.10.024

Cited by 61 publications

(32 citation statements)

References 20 publications

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“…It must be stated that particle size of these minerals are in the colloidal range. As a result, they are difficult to settle during wastewater treatment (Nasser et al, 2013).…”

Section: Pandp From Virgin Fiber -Production Techniquesmentioning

confidence: 99%

Review on recent developments on pulp and paper mill wastewater treatment

Kamali

Khodaparast

2015

Ecotoxicology and Environmental Safety

445

246

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“…It must be stated that particle size of these minerals are in the colloidal range. As a result, they are difficult to settle during wastewater treatment (Nasser et al, 2013).…”

Section: Pandp From Virgin Fiber -Production Techniquesmentioning

confidence: 99%

Review on recent developments on pulp and paper mill wastewater treatment

Kamali

Khodaparast

2015

Ecotoxicology and Environmental Safety

445

246

View full text Add to dashboard Cite

“…The charged molecules stemmed from liquid paper components that were not attached to the pulp fibers . For future zeta potential measurements on highly papers, using additional digital imaging techniques might be beneficial for tracking flocculation processes by time‐dependent changes in the turbidity of the papermaking furnish …”

Section: Design and Manufacturing Of Highly Filled Papersmentioning

confidence: 99%

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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“… 17 However, anionic polyelectrolytes also tend to create larger flocs of fibers compared to cationic ones. 8 …”

Section: Introductionmentioning

confidence: 99%

Polyelectrolyte Complex Coacervate Assembly with Cellulose Nanofibers

et al. 2020

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Polyelectrolytes are used in paper manufacturing to increase flocculation and water drainage and improve mechanical properties. In this study, we examine the interaction between charged cellulosic nanomaterials and polyelectrolyte complex coacervates of weak polyelectrolytes, polyacrylic acid salt, and polyallylamine hydrochloride. We observe that by changing the order of addition of the polyelectrolytes to cellulose nanofibers (CNFs), we can tune the interactions between the materials, which in turn changes the degree of association of the coacervates to the CNFs and the rate at which they aggregate. Importantly for the papermaking process, when adding the polyelectrolytes sequentially to the CNFs, we found faster aggregation to the fibers and lower water retention values compared to those when preformed coacervates or CNFs by themselves were used. Coarse-grain molecular dynamic simulations further support the fundamental mechanism of aggregation by taking into consideration the interaction between cellulose and the complexes at the molecular level. The simulations corroborate the experimental observations by showing the importance of strong electrostatic interactions in aggregate formation.

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Effect of polyelectrolytes on the degree of flocculation of papermaking suspensions

Cited by 61 publications

References 20 publications

Review on recent developments on pulp and paper mill wastewater treatment

Review on recent developments on pulp and paper mill wastewater treatment

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

Polyelectrolyte Complex Coacervate Assembly with Cellulose Nanofibers

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