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Gels from a semifluorinated n-alkane in fluorinated solvents as a probe for intermolecular interactions.

Journal of colloid and interface science (2009-08-18)
Lorenzo Tattini, Pierandrea Lo Nostro, Luca Scalise, Barry W Ninham, Piero Baglioni
ABSTRACT

Diblock semifluorinated n-alkanes can form aggregates and gels in fluorinated solvents. We have investigated the thermal behavior of binary mixtures comprising F(CF(2))(8)(CH(2))(16)H and fluorinated solvents. The solvents were perfluorohexane, perfluoroheptane, perfluorooctane, perfluorooctyl bromide, perfluorodecalin, and perfluorotributylamine. The phase diagrams were used to calculate the activity coefficients of the two components and the main excess thermodynamic functions. The solubility and self-assembly behavior of F(8)H(16) in the fluorinated solvents are related to the different solute-solvent dispersion interactions that depend on the polarizabilities and ionization potentials of the interacting species, and on the structural properties of the solvent.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Hexadecafluoroheptane, technical grade, 85%