Role of counterion size and distribution on the electrostatic component to the persistence length of wormlike polyions

Kenneth S. Schmitz

doi:10.1117/12.44170

1 June 1991 Role of counterion size and distribution on the electrostatic component to the persistence length of wormlike polyions

Kenneth S. Schmitz

Author Affiliations +

Proceedings Volume 1430, Photon Correlation Spectroscopy: Multicomponent Systems; (1991) https://doi.org/10.1117/12.44170
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Applications of the Poisson-Boltzmann (P-B) equation to simple electrolytes and polyelectrolytes, and Manning's two-state theory for counterion condensation on rodlike polyions are reviewed. A modified Scatchard approach applied to generate binding isotherms for the association of univalent ions of finite size to a linear lattice of unite charges, where two equilibrium conditions are taken into consideration: the number of stacks (ns), and the fraction of bound sites (0). Calculations indicate a rapid change in free ion concentration occurs in the range 0.75 < 0 < 0.9 for site separation values (b) less than the Bjerrum length of 7.12 $A. The apparent observation that counterion condensation does not obey a 'mass-action' law may therefore be an 'experimental illusion'.

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Kenneth S. Schmitz "Role of counterion size and distribution on the electrostatic component to the persistence length of wormlike polyions", Proc. SPIE 1430, Photon Correlation Spectroscopy: Multicomponent Systems, (1 June 1991); https://doi.org/10.1117/12.44170

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