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Order and Disorder in Monodisperse Latexes

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Polymer Colloids

Abstract

Iridescence due to Bragg diffraction of visible light is exhibited by electrolyte-free monodisperse polymer latexes, and also by redispersions of the polymer spheres in certain polar organic media. The center-to-center particle separation D, the particle diameter Do, and the volume fraction ϕ are related by ϕ(D/Do)3 = 0.74, the value 0.74, being the volume fraction occupied by spheres in a close-packed lattice. The structure responsible for the diffraction is thus identified as a lattice-like array which pervades the entire suspension, and is due to long-range coulombic forces between charged particles. Addition of electrolyte shortens the range of inter-particle forces through a screening action, thereby destroying the lattice and producing a disordered, non-diffracting suspension. At intermediate electrolyte levels, ordered and disordered phases coexist at equilibrium; the volume fractions of the coexisting phases are functions of the ionic strength.

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Author information

Authors and Affiliations

  1. Department of Chemistry and Division of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio, 44106, USA

    Irvin M. Krieger & P. Anne Hiltner

Authors
  1. Irvin M. Krieger
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  2. P. Anne Hiltner
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Editor information

Editors and Affiliations

  1. Department of Chemistry, The University of Connecticut, Storrs, Connecticut, USA

    Robert M. Fitch

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© 1971 Plenum Press, New York

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Krieger, I.M., Anne Hiltner, P. (1971). Order and Disorder in Monodisperse Latexes. In: Fitch, R.M. (eds) Polymer Colloids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1920-7_4

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  • DOI: https://doi.org/10.1007/978-1-4684-1920-7_4

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4684-1922-1

  • Online ISBN: 978-1-4684-1920-7

  • eBook Packages: Springer Book Archive

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