Fluorinated vs hydrogenated surfactants in mixtures with valinomycin-The Langmuir monolayer study

摘要

Selected fluorinated and hydrogenated surfactants, namely a semifluorinated alkane (SFA): 1,1,1, 2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10-henicosafluorononacosane (F10H19), two long chain alcohols: 18,18,18,17,17,16,16.15,15,14,14,13,13,12,12,11,11-heptadecafluorooctade cane-1-ol (F8H10OH) and octadecane-1-ol (C18OH) and with two long chain thiols of the analogous apolar part structure to the above-mentioned alcohols, i.e.: 18,18,18,17,17,16,16,15,15,14,14,13,13,12,12,11,11-heptadecafluorooctade cane-1-thiol (F8H10SH) and octadecane-1-thiol (C18SH) have been tested in mixtures with valinomycin as potential artificial matrixes for its immobilization. The thermodynamic analysis (Delta G(exc) vs X-val plots) based on surface pressure-area isotherm registration for particular valinomycin/surfactant mixtures, complemented with BAM images of the films structure indicate that only fluorinated surfactants are suitable materials for valinomycin incorporation as they form homogeneous miscible monolayers at X-val below 0.5.