Small-angle Rayleigh scattering by relatively large latex particles

Robert Y. Ofoli, Dennis C. Prieve

    Research output: Research - peer-reviewArticle

    • 10 Citations

    Abstract

    According to the Rayleigh-Debye (RG) theory of light scattering, the intensity of forward scattering is proportional to the volume-squared of the scatterers, independent of their shape or orientation. This makes small-angle light scattering (SALS) attractive as a tool for studying the kinetics of flocculation of model latexes, where the conformation of elemental particles in any floe is unknown. In preparation for such a study using a modified version of the apparatus of Lips and Willis (1973), we experimentally determine the limits under which SALS produced by a He-Ne laser can be used for sizing of monodisperse polystyrene latexes. For every particle in the sample volume to experience the same intensity of incident light (i.e. for negligible extinction), the particle concentration must be less than cmax, where cmaxld6=(1.08 ± 0.09) × 10-26 m4, l is the pathlength and d is the particle diameter. For c <cmax, the scattering per particle at 2° is proportional to d6 provided d is less than 1 μm, which is considerably larger than for scattering at larger angles. We speculate that the scattering by flocs will be proportional to the square of the number of elemental particles in dependent of their conformation provided the floe is also smaller than 1 μm.

    LanguageEnglish (US)
    Pages4837-4842
    Number of pages6
    JournalLangmuir
    Volume13
    Issue number18
    StatePublished - Sep 3 1997

    Profile

    Rayleigh scattering
    Latexes
    Light scattering
    Particles (particulate matter)
    Scattering
    Latex
    latex
    Conformations
    scattering
    light scattering
    Forward scattering
    Light extinction
    Flocculation
    Polystyrenes
    Kinetics
    Lasers
    styrofoam
    sizing
    forward scattering
    polystyrene

    ASJC Scopus subject areas

    • Colloid and Surface Chemistry
    • Physical and Theoretical Chemistry

    Cite this

    Small-angle Rayleigh scattering by relatively large latex particles. / Ofoli, Robert Y.; Prieve, Dennis C.

    In: Langmuir, Vol. 13, No. 18, 03.09.1997, p. 4837-4842.

    Research output: Research - peer-reviewArticle

    Ofoli, Robert Y. ; Prieve, Dennis C./ Small-angle Rayleigh scattering by relatively large latex particles. In: Langmuir. 1997 ; Vol. 13, No. 18. pp. 4837-4842
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