Light-scattering efficiency of starch acetate pigments as a function of size and packing density

Antti Penttilä, Kari Lumme, Lauri Kuutti

    Research output: Contribution to journalArticleScientificpeer-review

    14 Citations (Scopus)

    Abstract

    We study theoretically the light-scattering efficiency of paper coatings made of starch acetate pigments. For the light-scattering code we use a discrete dipole approximation method. The coating layer is assumed to consists of roughly equal-sized spherical pigments packed either at a packing density of 50% (large cylindrical slabs) or at 37% or 57% (large spheres). Because the scanning electron microscope images of starch acetate samples show either a particulate or a porous structure, we model the coatings in two complementary ways. The material can be either inside the constituent spheres (particulate case) or outside of those (cheeselike, porous medium). For the packing of our spheres we use either a simulated annealing or a dropping code. We can estimate, among other things, that the ideal sphere diameter is in the range 0.25–0.4  μm.
    Original languageEnglish
    Pages (from-to)3501-3509
    Number of pages9
    JournalApplied Optics
    Volume45
    Issue number15
    DOIs
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Dive into the research topics of 'Light-scattering efficiency of starch acetate pigments as a function of size and packing density'. Together they form a unique fingerprint.

    Cite this