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Structural, microrheological and kinetic properties of a ternary silica-Pluronic F127-starch thermosensitive system
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
Karlsruhe Inst Technol, Inst Mech Proc Engn & Mech.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).ORCID iD: 0000-0002-1256-1708
2018 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 514, p. 459-467Article in journal (Refereed) Published
Abstract [en]

Hypothesis: The sol-gel transition in aqueous suspensions consisting of silica particles and thermosensitive polymer is controlled by inter-particle forces and solution properties of the polymer. Addition of a second non-thermosensitive polymer may affect the transition. The purpose of this work was to characterize the kinetics of the sol-gel transition and to understand the effects of a second non-thermosensitive polymer on the microstructure, using a combination of classical rheology and microrheology. Experiments: Classical rotational rheology as well as two microrheology methods, Multiple Particle Tracking (MPT) and Diffusing Wave Spectroscopy (DWS), were used to investigate the sol-gel transition of a ternary silica-Pluronic F127-starch thermosensitive system. Findings: Classical rheometry and DWS indicated sol-gel transition temperature similar to 25 degrees C at 1 wt% Pluronic, independently of the concentration of the other components. DWS showed a fast gelation process, less than two minutes for all samples, beside a second slow kinetic process. In the gel state, MPT indicated micro-structural and micro-viscoelastic differences compared to rotational rheology. This was explained by formation of an elastic matrix of silica and polymers in combination with assembly of silica particles in large macroporous agglomerates. Presence of starch led to breakdown of the macro porous network, leaving the homogeneous elastic network left.

Place, publisher, year, edition, pages
Academic Press, 2018. Vol. 514, p. 459-467
Keywords [en]
Thermosensitive; Silica-pluronic-starch; Sol-gel transition; Kinetic; Microrheology; Microstructure
National Category
Chemical Sciences
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-66616DOI: 10.1016/j.jcis.2017.12.051ISI: 000424963700050PubMedID: 29289030OAI: oai:DiVA.org:kau-66616DiVA, id: diva2:1188828
Available from: 2018-03-08 Created: 2018-03-08 Last updated: 2018-08-15Bibliographically approved

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Petkova-Olsson, YanaUllsten, HenrikJärnström, Lars

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