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  • 1.
    Petkova-Olsson, Yana
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
    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).
    Thermosensitive silica-pluronic-starch model coating dispersion-part I: The effect of Pluronic block copolymer adsorption on the colloidal stability and rheology2016In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 506, p. 245-253Article in journal (Refereed)
    Abstract [en]

    The colloidal stability of a model paper coating dispersion consisting of silica particles, Pluronic F127, starch and glycerol was studied with respect to PF127 temperature responsiveness and its adsorption on the silica surface. Rheological characterization of this system in order to extract structural information for the wet suspension state was accomplished in terms of rotational tests. The analysis, done by Krieger-Dougherty model and the elastic floc model for all flow curves at three different temperatures, 20 degrees C, 25 degrees C and 30 degrees C, and at different particle volume fractions (phi between 0 and 0.31), revealed that the structure of the system changes. Two regions with different behaviour and a plateau region at particle volume fraction of phi similar to 0.16 were observed. At phi <= 0.16 temperature was affecting the suspension structure. By rising the temperature the well dispersed suspension at 20 degrees C transformed to flocculated one, where the higher the temperature was, more open floc structures were detected in terms of degree of flocculation parameter, C-fp, but at the same time with increasing the particle concentration the flocs got denser according to the calculated. At phi >= 0.16, there were not detected major structural differences by changing temperature or particle concentration. At phi similar to 0.16 a plateau in yield stress values was observed. The behaviour of the investigated model coating suspension was discussed in terms of shear stresses and C-fp. 

  • 2.
    Petkova-Olsson, Yana
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
    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).
    Thermosensitive Silica-Pluronic-Starch model coating dispersion-Part II: The relationship between rheology and microstructure2016In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 509, p. 415-426Article in journal (Refereed)
    Abstract [en]

    The colloidal interaction between the components in coating dispersions play a key role in the structural organization on a micro level, which has influence upon the macroscopic properties of the material. The viscoelastic properties of a model coating suspension, consisting of colloidal silica particles, a temperature-responsive triblock copolymer Pluronic F127 and starch were studied and related to the corresponding dried structures. Pluronic F127 was used in order to produce a temperature-sensitive starch system and to simulate the drying of a paper coating at a low shear rates. The gelation process was investigated by the change in storage modulus upon heating and the change in particle volume fraction, empty set. The results revealed a dense disordered liquid-like state at empty set less than or similar to 0.10, where the strength of attraction between particles increased with increasing particle volume fraction and increasing temperature, a solid-like microcrystalline state at empty set greater than or similar to 0.20, where the temperature did not affect the rheology of the system and a solid-like microcrystalline state were coexisting at empty set similar to 0.16. The structures detected by rheology were related to the dried structures of the corresponding suspensions. At empty set less than or similar to 0.10 and elevated temperatures, a controlled formation of self-supporting floc structure was performed, which could be used to promote the even distribution of starch within the composite material. 

  • 3.
    van Stam, Jan
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
    Hansson, Rickard
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
    Lindqvist, Camilla
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
    Ericsson, Leif
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering. Karlstad University, Faculty of Technology and Science, Materials Science.
    Moons, Ellen
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Fluorescence spectroscopy studies on polymer blend solutions and films for photovoltaics2015In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 483, p. 292-296Article in journal (Refereed)
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