Simultaneous characterization of coated paper topography and optical contrast by near-field scanning optical microscopy (NSOM)

    Authors

    D. Q. Ma; R. D. Carter; D. Haefner;A. Dogariu

    Comments

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    Abbreviated Journal Title

    Nord. Pulp Paper Res. J.

    Keywords

    Coated paper; Topography; Optical contrast; Near-field scanning optical; microscopy (NSOM); POLARIZED-LIGHT REFLECTOMETRY; COATING STRUCTURE; FLUORESCENCE; RESOLUTION; SURFACE; Materials Science, Paper & Wood

    Abstract

    Paper coatings are composite materials with their dielectric functions varying randomly with position. Their optical properties are determined by both refractive index fluctuations and topography. We demonstrate that near-field scanning optical microscopy (NSOM) provides a unique capability of measuring simultaneously the information about both local topography and optical contrast at resolutions better than conventional far-field techniques. We present results of studying fine kaolin blends with broad and narrow particle size distribution ground calcium carbonates in top coat of double-coated paper from a high speed pilot coating. We found that the optical contrast in the proximity of the coating layer is a direct indication of samples diffusiveness. Also, our results demonstrate that the addition of fine platy kaolin increased the topographic correlation lengths resulting in a smoother varying surface. The NSOM measurements suggest that surface roughness and correlation length of the topography affect surface anisotropy and optical properties. The complex characterization approach introduced here may have potential applications in studies of optical loss, adhesion, and friction.

    Journal Title

    Nordic Pulp & Paper Research Journal

    Volume

    23

    Issue/Number

    4

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    438

    Last Page

    443

    WOS Identifier

    WOS:000262102700014

    ISSN

    0283-2631

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