Water-Soluble Highly Charged Fullerene Derivatives as
Spherical Electrolytes.
Electrostatic Contributions to Thermodynamic Functions of Systems Containing
Mixtures of Counterions Differing in Charge and SizeJože Škerjanc
Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva
5,
1000 Ljubljana, Slovenia
Absrtract
The Poisson-Boltzmann equation has
been solved to obtain the electrostatic potential for the spherical cell model
of a fullerene molecule at which charged functional groups are attached. The
fullerene macroion is surrounded by mixtures of small counterions differing in
size and charge. The electrostatic internal and free energies, degree of binding
of counterions, osmotic coefficient, and distribution of counterions around the
charged fullerene shell are calculated. These properties are presented as
functions of radii, charges and mole fractions of counterions.
Key words: Poisson-Boltzmann equation, spherical cell model, thermodynamic
functions, polyelectrolyte solutions, fullerene electrolytes,
fullerenehexamalonic acid