Diblock semifluorinated n-alkanes purification by gel phase formation in organic solvent :C8F17C18H37 in alcohols

The formation of a gel-like phase observed with some diblock semifluorinated n-alkanes dissolved in organic solvents was investigated as a purification method for these compounds. Experiments were carried out with F(CF2)(8)(CH2)(18)H by using absolute ethanol or methanol as solvent. Starting from samples with different initial degrees of purity, and using a very strict methodology, the amount of solvent giving the highest yield of purification was determined. The different solubilizing power of the solvents used did not greatly influenced the purification process. Different cooling rates were also investigated, but only small influences on the treatment effectiveness were observed.