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Electrostatic effects in macromolecular and interfacial systems

Wang, Zhen-Gang (2013) Electrostatic effects in macromolecular and interfacial systems. In: 246th ACS National Meeting & Exposition, Sept. 8-12, 2013, Indianapolis, IN.

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In this talk, I discuss two electrostatic effects that have profound effects in macromol. and interfacial systems and yet have not been much appreciated in the main literature on electrolytes or polyelectrolytes. The first effect is the Born solvation energy or more generally the self-energy of salt ions. The preference of an ion to be solvated by the more polarizable component in a liq. mixt. creates a significant driving force for phase sepn. and is responsible for the nonuniform salt concn. and charge sepn. near an interface. The preferential solvation effect is used to explain the dramatic increase in the order-disorder transition temp. of Polyethylene Oxide-Polystyrene diblock copolymer upon the addn. of small amts. of lithium salts. I also present a simple theory for explaining the long-standing Jones-Ray and ion size effects in the interfacial tension for electrolyte solns. The second effect is the Donnan potential effect in biol. systems. The presence of mostly neg. charged macromols. in the cellular milieu generates a substantial neg. potential relative to a monovalent salt soln. I present a theory that argues that this Donnan potential explains the prevalence of neg. overcharged RNA viruses in Nature.

Item Type:Conference or Workshop Item (Paper)
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Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 2013 American Chemical Society.
Record Number:CaltechAUTHORS:20131011-083218067
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41885
Deposited By: Tony Diaz
Deposited On:11 Oct 2013 20:57
Last Modified:03 Oct 2019 05:53

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