The influence of electrostatic interactions in polyelectrolyte complexes on water retention values of cellulose nanofiber slurries

Khan, Nasreen; Renfroe, Alexis R.; Grey, Petra von; Witherow, Heather A.; Brettmann, Blair

doi:10.1007/s10570-022-04827-9

Cited by 3 publications

(1 citation statement)

References 65 publications

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“…The charge carried by polyelectrolytes endows them with water solubility and also provides a mechanism for attractive interactions with opposite charges. Applications for this affinity range from stabilizing or destabilizing suspended particles or colloids to constructing ultrathin films via the layer-by-layer assembly process. , Large quantities of polyelectrolytes are used as flocculants for treating types of suspensions in water treatment, in papermaking, in biotechnology, and for mineral processing . Particle bridging by polyelectrolytes enables their use in soil stabilization. , …”

Section: Introductionmentioning

confidence: 99%

Relative Strength of Polycation Adsorption on Oxide Surfaces

Akintola,

Abou Shaheen,

et al. 2024

Langmuir

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Polyelectrolyte adsorption onto surfaces is widely employed in water treatment and mining. However, little is known of the relative interaction strengths between surfaces and polymer. This fundamental property is assumed to be dominated by electrostatics, i.e., attractive interactions between opposite charges, which are set by the overall ionic strength ("salt concentration") of the solution, and charge densities of the surface and the polymer. A common, counterintuitive finding is a range of salt concentrations over which the amount of adsorbed polyelectrolyte increases as electrostatic interactions are tempered by the addition of salt. After an adsorption maximum, higher salt concentrations then produce the expected gradual desorption of polyelectrolyte. In this work, the salt response of the adsorption of the same narrow molecular weight distribution polycation, poly(N-methyl-4-vinylpyridinium), PM4VP, to a variety of surfaces was explored. Oxide powders for adsorption included Al 2 O 3 , SiO 2 , Fe 2 O 3 , Fe 3 O 4 , TiO 2 , ZnO, and CuO. Planar surfaces included silicon wafers, mica, calcium carbonate, and CaF 2 single crystals. The PM4VP was radiolabeled with 14 C so that sensitive, submonolayer amounts could be detected. The position of the peak maximum, or the lack of a peak, in response to added salt was used to rank the electrostatic component of the interaction. The importance of charge regulation, a shift in the surface pK a in response to solution species, was highlighted as a mechanism for adsorption on the "wrong" side of the isoelectric point and also as a factor contributing to the difficulty of reaching the totally desorbed state even at the highest salt concentrations.

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Section: Introductionmentioning

confidence: 99%

Relative Strength of Polycation Adsorption on Oxide Surfaces

Akintola,

Abou Shaheen,

et al. 2024

Langmuir

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Carboxylated nanocellulose for wound healing applications – Increase of washing efficiency after chemical pre-treatment and stability of homogenized gels over 10 months

Chinga-Carrasco¹,

Pasquier²,

Solberg³

et al. 2023

Carbohydrate Polymers

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Water chemistry challenges in pulping and papermaking – fundamentals and practical insights: Part 2: Conductivity, charge, and hardness

Pruszyński¹,

Xu²,

Hart³

2023

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Although water is essential to the papermaking process, papermakers often overlook its importance and focus on fibers, fillers, and chemical additives. A better understanding of water properties and chemical interactions associated with water at the wet end leads to a sound foundation for high-quality paper production and smooth operation. Water is an excellent solvent for ionic substances, both organic and inorganic. These substances contribute to system conductivity, charge, and hardness and significantly impact the papermaking process. Part 1 of this paper, published in TAPPI J. 21(6): 313(2022), discussed fundamental water properties, water chemistry, and the impact of pH on pulping and papermaking operations. In this paper, we review definitions, sources, and the typical symptoms of the effect of conductivity, charge, and hardness on the productivity of the papermaking process. Sources of conductivity, charge, and hardness impacting these factors, measurement methods, and available correction strategies for their control are also discussed.

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The influence of electrostatic interactions in polyelectrolyte complexes on water retention values of cellulose nanofiber slurries

Cited by 3 publications

References 65 publications

Relative Strength of Polycation Adsorption on Oxide Surfaces

Relative Strength of Polycation Adsorption on Oxide Surfaces

Carboxylated nanocellulose for wound healing applications – Increase of washing efficiency after chemical pre-treatment and stability of homogenized gels over 10 months

Water chemistry challenges in pulping and papermaking – fundamentals and practical insights: Part 2: Conductivity, charge, and hardness

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