Effect of cationic polyelectrolyte and surfactant on cohesion and friction in contacts between cellulose fibers

Амелина, Е. А.; Shchukin, E. D.; Parfenova, A.M.; Pelekh, V. V.; Vidensky, Igor; Bessonov, A. I.; Aranovich, G. L.; Donohue, Marc D.

doi:10.1016/s0927-7757(99)00300-3

Cited by 21 publications

(6 citation statements)

References 7 publications

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“…Under this hypothesis, we should have observed a correlation between membrane flexibility and sap surface tension. Surfactants can impact the rheological properties of cellulosic fibers (Swerin, 1998;Amelina et al, 2000) and surface tension did modify membrane flexibility in Pinus as indicated by the greater drop in conductivity in the high pressure injection experiment (Fig. 6).…”

Section: Discussionmentioning

confidence: 98%

New Insights into the Mechanisms of Water-Stress-Induced Cavitation in Conifers

et al. 2009

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Cavitation resistance is a key parameter to understand tree drought tolerance but little is known about the mechanisms of air entry into xylem conduits. For conifers three mechanisms have been proposed: (1) a rupture of pit margo microfibrils, (2) a displacement of the pit torus from its normal sealing position over the pit aperture, and (3) a rupture of an air-water menisci in a pore of the pit margo. In this article, we report experimental results on three coniferous species suggesting additional mechanisms. First, when xylem segments were injected with a fluid at a pressure sufficient to aspirate pit tori and well above the pressure for cavitation induction we failed to detect the increase in sample conductance that should have been caused by torus displacement from blocking the pit aperture or by membrane rupture. Second, by injecting xylem samples with different surfactant solutions, we found a linear relation between sample vulnerability to cavitation and fluid surface tension. This suggests that cavitation in conifers could also be provoked by the capillary failure of an air-water meniscus in coherence with the prediction of Young-Laplace's equation. Within the bordered pit membrane, the exact position of this capillary seeding is unknown. The possible Achilles' heel could be the seal between tori and pit walls or holes in the torus. The mechanism of water-stress-induced cavitation in conifers could then be relatively similar to the one currently proposed for angiosperms.

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Section: Discussionmentioning

confidence: 98%

New Insights into the Mechanisms of Water-Stress-Induced Cavitation in Conifers

et al. 2009

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“…The coefficient of friction is most likely influenced by surface properties, e.g., charge, the amount of lignin and fiber morphology as well as the properties of the fiber bulk, whereas F 0 is expected to be proportional to the contact area. [24] The same pulps studied in this work have been investigated in another work made by Risén et al [25] In this work, the chemical composition of the fiber surfaces was studied. It has been shown by Andersson et al [14] that m for wet pine kraft pulp fibers decreases as the kappa number decreases.…”

Section: Influence Of Bleaching On Network Strengthmentioning

confidence: 97%

Influence of Fiber Properties on the Network Strength of Softwood and Hardwood Kraft Pulp Fibers from Different Stages of a Bleaching Sequence

Risén

Hultén

Paulsson

2004

Journal of Wood Chemistry and Technology

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During chemical pulping and bleaching operations, fiber properties are gradually changed due to mechanical and chemical treatment. The changes in fiber properties, in turn, influence network strength, i.e., the rigidity of fiber networks. In this study, the influence of fiber length, lignin content, specific surface area, total charge, and fiber flexibility on the network strength of commercial unbleached and totally chlorine free (TCF) bleached (ozone and hydrogen peroxide) softwood and hardwood kraft pulp suspensions have been investigated. The fiber length, total lignin content, and total charge decreased together with the network strength along the fiber line while the specific surface area and fiber flexibility increased. Correlations equal to or greater than 90% were found between network strength and fiber length, lignin content, specific surface area, and total charge. The interrelationship between the fiber properties indicated that for a given pulp, the total lignin content was the parameter that had the greatest influence on the network strength.

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“…[1] Due to their electrostatic nature, these materials are, usually, water-soluble, being classified as polybases, polyacids, or polysalts, depending on the nature of their dissociation. [5] These polymers are used in the stabilization of enzymes in colloidal systems that are used in several applications, such as detergents, food and textile processing, and biosensors; in these systems, many of the enzymes are unstable and need refrigeration to maintain their stability by some sort of matrix stabilization, a problem that has been overcome with the use of polyelectrolytes as stabilizers, since adsorbed polyelectrolyte conformation and the charges of the particles covered by them have decisive influence on the stability and flocculation of suspensions. [2] Initially, these polymers were mainly used as rheology modifiers, [3] but one of the most interesting uses of these materials has been the stabilization and flocculation of a wide variety of colloidal systems, [4] as well as the modification of solid surfaces and interfaces.…”

Section: Introductionmentioning

confidence: 99%

Polyelectrolytes in Solution and the Stabilization of Colloids

Vasconcelos

Pereira

Fonseca

2005

Journal of Dispersion Science and Technology

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Polyelectrolytes are very versatile macromolecular materials that have found more and more applications in several technologies. In this article applications related to their use as (de)stabilizers for colloids are reviewed. Additionally, some theories that deal with colloid stabilization are described. Finally, the rheology of the disperser phase as well as the relationship between the rheology of the whole colloidal system and polyelectrolyte stabilization are discussed.

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Effect of cationic polyelectrolyte and surfactant on cohesion and friction in contacts between cellulose fibers

Cited by 21 publications

References 7 publications

New Insights into the Mechanisms of Water-Stress-Induced Cavitation in Conifers

New Insights into the Mechanisms of Water-Stress-Induced Cavitation in Conifers

Influence of Fiber Properties on the Network Strength of Softwood and Hardwood Kraft Pulp Fibers from Different Stages of a Bleaching Sequence

Polyelectrolytes in Solution and the Stabilization of Colloids

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