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  • 1.
    Carlsson, Gunilla
    et al.
    Karlstad University, Division for Chemistry.
    Järnström, Lars
    Karlstad University, Division for Chemistry.
    van Stam, Jan
    Karlstad University, Division for Chemistry.
    Latex Diffusion at High Volume Fractions Studied by Fluorescence Microscopy2006In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 298, no 1, p. 162-171Article in journal (Refereed)
  • 2.
    Carlsson, Gunilla
    et al.
    Karlstad University, Division for Chemistry.
    Warszynski, Piotr
    van Stam, Jan
    Karlstad University, Division for Chemistry.
    Dynamic Fluorescence Microscopy As a Feasible Technique for Estimating the Diffusion Coefficients of Small Particles in the Presence of Additives2003In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 267, no 2, p. 500-508Article in journal (Refereed)
  • 3.
    Petkova-Olsson, Yana
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
    Oelschlaeger, Claude
    Karlsruhe Institute of Technology, Germany.
    Ullsten, Henrik
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
    Järnström, Lars
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
    Structural, microrheological and kinetic properties of a ternary silica-Pluronic F127-starch thermosensitive system2018In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 514, p. 459-467Article in journal (Refereed)
    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.

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