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Poly(vinylpyrrolidone) as dispersing agent for cerium-gadolinium oxide (CGO) suspensions

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Abstract

The behaviour of selected poly(vinylpyrrolidone) grades to act as dispersant for ethanol-based cerium-gadolinium oxide suspensions was investigated and related to the molecular weight characteristics. The number, weight, and z-average molecular weights M n, M w, and M z were determined by gel permeation chromatography and then used in a numerical method to evaluate the viscosity average molecular weight (M v) via an empirically modified Mark–Houwink–Sakurada (MHS) equation. The MHS equation parameters (a and K) and the polydispersity correction factor (q MHS) were also evaluated. Three grades with different molecular weight features were selected and further studied as dispersants by means of rheology. Despite the differences, only slight shifts in the amount of polymer required for achieving fully stabilized dispersions were observed, whereas comparable packing properties were obtained. This was explained as an effect of the polydispersity, expressed as q MHS.

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Acknowledgements

Financial support from Danish Energy Agency (EUDP-Energy Technology Development and Demonstration Program) through the projects SOFC Accelerated-Development to Accelerate Field Demonstrations (Project 64012-0225) is gratefully acknowledged. The authors acknowledge Lene Knudsen and Søren Christensen for valuable assistance in the experimental work.

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Authors and Affiliations

  1. Department of Energy Conversion and Storage, Technical University of Denmark (DTU), Frederiksborgvej 399, 4000, Roskilde, Denmark

    Debora Marani, Bhaskar Reddy Sudireddy & Ragnar Kiebach

  2. Department of Micro- and Nanotechnology, Technical University of Denmark (DTU), Produktionstorvet 423, 2800, Lyngby, Denmark

    Lotte Nielsen & Sokol Ndoni

  3. Center for Nanostructured Graphene, Technical University of Denmark (DTU), 2800, Lyngby, Denmark

    Lotte Nielsen & Sokol Ndoni

Authors
  1. Debora Marani
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  2. Bhaskar Reddy Sudireddy
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  3. Lotte Nielsen
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  4. Sokol Ndoni
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  5. Ragnar Kiebach
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Correspondence to Debora Marani.

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Marani, D., Sudireddy, B.R., Nielsen, L. et al. Poly(vinylpyrrolidone) as dispersing agent for cerium-gadolinium oxide (CGO) suspensions. J Mater Sci 51, 1098–1106 (2016). https://doi.org/10.1007/s10853-015-9439-5

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  • DOI: https://doi.org/10.1007/s10853-015-9439-5

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