Dispersion Mechanisms of Lignosulfonates in Concentrated TiO 2 Suspensions and Pastes: The Effects of Molecular Weight Distributions and Ionic Composition.
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| Title: | Dispersion Mechanisms of Lignosulfonates in Concentrated TiO 2 Suspensions and Pastes: The Effects of Molecular Weight Distributions and Ionic Composition. |
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| Authors: | Selvik, Veslemøy Margrethe1,2 (AUTHOR), Salas-Bringas, Carlos1,2 (AUTHOR), Øye, Gisle1,2 (AUTHOR) gisle.oye@ntnu.no |
| Source: | Polymers (20734360). Jan2026, Vol. 18 Issue 2, p270. 18p. |
| Subjects: | Lignosulfonates, Molecular weights, Rheology, Physisorption, Ionic structure, Electrolyte analysis, Dispersion (Chemistry), Titanium dioxide |
| Abstract: | This study investigates how molecular weight, ionic strength, and ionic composition influence the performance of sodium lignosulfonate as a dispersant for titanium dioxide (TiO2) suspensions. Adsorption behavior was quantified using a quartz crystal microbalance with dissipation monitoring (QCM-D), while dispersion efficiency was assessed in concentrated suspensions via particle analysis (LUMiSizer) and in pastes through rheological measurements. In salt-free conditions, no adsorption occurs; however, the observed low particle size and viscosity can be attributed to depletion stabilization by non-adsorbing lignosulfonates. Both low- and high-molecular-weight fractions exhibit dispersing performance, but high-molecular-weight lignosulfonate provides the greatest stability across electrolyte variations. Increasing ionic strength enhances adsorption, leading to elastic particle network formation and higher viscosity due to reduced Debye length. With divalent ions, this effect is stronger and promoted by divalent cation bridging. These findings underscore the importance of tailoring lignosulfonate molecular weight and dosage to operating conditions, supporting formulation strategies for mineral-rich suspensions and industrial effluents. Future work should address long-term stability, temperature effects, and behavior on hydrophobic surfaces. [ABSTRACT FROM AUTHOR] |
| Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 191214677 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Dispersion Mechanisms of Lignosulfonates in Concentrated TiO 2 Suspensions and Pastes: The Effects of Molecular Weight Distributions and Ionic Composition. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Selvik%2C+Veslemøy+Margrethe%22">Selvik, Veslemøy Margrethe</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Salas-Bringas%2C+Carlos%22">Salas-Bringas, Carlos</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Øye%2C+Gisle%22">Øye, Gisle</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> gisle.oye@ntnu.no</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Jan2026, Vol. 18 Issue 2, p270. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Lignosulfonates%22">Lignosulfonates</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+weights%22">Molecular weights</searchLink><br /><searchLink fieldCode="DE" term="%22Rheology%22">Rheology</searchLink><br /><searchLink fieldCode="DE" term="%22Physisorption%22">Physisorption</searchLink><br /><searchLink fieldCode="DE" term="%22Ionic+structure%22">Ionic structure</searchLink><br /><searchLink fieldCode="DE" term="%22Electrolyte+analysis%22">Electrolyte analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Dispersion+%28Chemistry%29%22">Dispersion (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Titanium+dioxide%22">Titanium dioxide</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This study investigates how molecular weight, ionic strength, and ionic composition influence the performance of sodium lignosulfonate as a dispersant for titanium dioxide (TiO2) suspensions. Adsorption behavior was quantified using a quartz crystal microbalance with dissipation monitoring (QCM-D), while dispersion efficiency was assessed in concentrated suspensions via particle analysis (LUMiSizer) and in pastes through rheological measurements. In salt-free conditions, no adsorption occurs; however, the observed low particle size and viscosity can be attributed to depletion stabilization by non-adsorbing lignosulfonates. Both low- and high-molecular-weight fractions exhibit dispersing performance, but high-molecular-weight lignosulfonate provides the greatest stability across electrolyte variations. Increasing ionic strength enhances adsorption, leading to elastic particle network formation and higher viscosity due to reduced Debye length. With divalent ions, this effect is stronger and promoted by divalent cation bridging. These findings underscore the importance of tailoring lignosulfonate molecular weight and dosage to operating conditions, supporting formulation strategies for mineral-rich suspensions and industrial effluents. Future work should address long-term stability, temperature effects, and behavior on hydrophobic surfaces. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/polym18020270 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 270 Subjects: – SubjectFull: Lignosulfonates Type: general – SubjectFull: Molecular weights Type: general – SubjectFull: Rheology Type: general – SubjectFull: Physisorption Type: general – SubjectFull: Ionic structure Type: general – SubjectFull: Electrolyte analysis Type: general – SubjectFull: Dispersion (Chemistry) Type: general – SubjectFull: Titanium dioxide Type: general Titles: – TitleFull: Dispersion Mechanisms of Lignosulfonates in Concentrated TiO 2 Suspensions and Pastes: The Effects of Molecular Weight Distributions and Ionic Composition. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Selvik, Veslemøy Margrethe – PersonEntity: Name: NameFull: Salas-Bringas, Carlos – PersonEntity: Name: NameFull: Øye, Gisle IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 01 Text: Jan2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 20734360 Numbering: – Type: volume Value: 18 – Type: issue Value: 2 Titles: – TitleFull: Polymers (20734360) Type: main |
| ResultId | 1 |
