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DOI: 10.5445/IR/1000078407
DOI: 10.1016/j.jcis.2017.12.051

Structural, microrheological and kinetic properties of a ternary silica-Pluronic F127-starch thermosensitive system

Petkova-Olsson, Yana; Oelschlaeger, Claude; Ullsten, Henrik; Järnström, Lars

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 $\sim$ 25 °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 compar ... mehr

Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 0021-9797, 1095-7103
URN: urn:nbn:de:swb:90-784079
KITopen ID: 1000078407
Erschienen in Journal of colloid and interface science
Band 514
Seiten 459-467
Vorab online veröffentlicht am 19.12.2017
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