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Novel nanostructured PCC fillers

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Abstract

New filler and pigment technologies are needed to improve the optical properties of paper. Filler contents in different paper grades are approaching the maximum levels achievable with current papermaking practices. Much work has been done to maximize the light scattering potential of fillers and pigments by modifying their particle size distribution or specific surface area. The refractive index (RI) is an optical constant of pigment, and less attention has been paid to the possibility of increasing this parameter. In the present study, a novel nanostructured filler-grade precipitated calcium carbonate (PCC) pigment was synthesized. Zinc-based nanostructures, physically contacted with the host PCC material, increase the differences in RI between filler-fiber and filler-air interfaces, yielding increased light scattering. The effective RI of the novel filler was measured using a method which combines a multi-function spectrometer with the immersion liquid method. This method enables effective RI measurement from pigment suspensions, irrespective of the shape, size, and nanostructures occurring on the host pigments. When compared to conventional PCC, the results gained with the nanostructured PCCs suggest an increase in the effective RI. When used as filler in paper, nanostructured PCC yields improved light scattering, i.e., better opacity.

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Acknowledgements

Financial support from Finnish Funding Agency for Technology and Innovation (Tekes), J.M. Huber Finland Oy, M-real Oyj, Omya Oy, and UPM-Kymmene Oyj is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Forest Products Technology, Paper and Printing Technology, Helsinki University of Technology TKK, P.O. Box 6300, 02150, Espoo, Finland

    Kimmo Koivunen & Hannu Paulapuro

  2. Measurement and Sensor Laboratory, University of Oulu, Technology Park 127, 87400, Kajaani, Finland

    Ilpo Niskanen

  3. Department of Physics and Mathematics, University of Joensuu, P.O. Box 111, 80101, Joensuu, Finland

    Kai-Erik Peiponen

Authors
  1. Kimmo Koivunen
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  2. Ilpo Niskanen
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  3. Kai-Erik Peiponen
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  4. Hannu Paulapuro
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Correspondence to Kimmo Koivunen.

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Koivunen, K., Niskanen, I., Peiponen, KE. et al. Novel nanostructured PCC fillers. J Mater Sci 44, 477–482 (2009). https://doi.org/10.1007/s10853-008-3095-y

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  • DOI: https://doi.org/10.1007/s10853-008-3095-y

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