## FCSys.Characteristics.'SO3-'.Ionomer

C9HF17O5S- ionomer

### Information

Assumptions:

1. Constant specific volume (i.e., incompressible and without thermal expansion)

The specific volume (`v = U.cc*m/(2.00*U.g)`) is based on [Lin2006, p. A1327]. Note that this is approximately 1.912 M, which does not match the default density of 'H+'.Ionomer (0.95 M), but it simplifies the model by requiring only C19HF37O5S- (not C19HF37O5S) for charge neutrality.

Additional notes:

- Most of the data for this species is for C19HF37O5S rather than C19HF37O5S- (with the exception of specific mass).
- A form of C19HF37O5S is C7HF13O5S.(C2F4)6, which is a typical configuration of Nafion sulfonate (after hydrolysis) [Mark1999, p. 234].
- Thermodynamic data for this material is not available from [McBride2002]. The default specific heat capacity (bc = `[4188*U.J*m/(U.kg*U.K)]`) is based on [Shah2009, p. B472].
- According to [Avogadro], the furthest distance between two atoms of C19HF37O5S is 2259.8 pm and is between fluorines. The radius of F is 147 pm (http://en.wikipedia.org/wiki/Fluorine).
- From [Avogadro], the molecular weight of C19HF37O5S is 1044.214 g/mol. However, the "11" in Nafion 11x indicates a molecular weight of 1100 g/mol. According to http://en.wikipedia.org/wiki/Nafion, "the molecular weight of Nafion is uncertain due to differences in processing and solution morphology."

For more information, please see the Characteristic package.

Extends from BaseClasses.Characteristic (Package of thermodynamic and diffusive properties).