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Synthesis and Some Properties of Fluorinated Cationic Surfactants
Author(s) -
Mohamed M. Z.,
Mohamed A. S.
Publication year - 2009
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-009-1126-6
Subject(s) - chemistry , cationic polymerization , critical micelle concentration , surface tension , adsorption , gibbs isotherm , aqueous solution , pulmonary surfactant , bromide , amine gas treating , thermodynamics of micellization , stoichiometry , micelle , inorganic chemistry , organic chemistry , thermodynamics , biochemistry , physics
Three fluorinated cationic surfactants were prepared by condensing N ‐methyl diethanol amine pentafluoro benzoate with stoichiometric amounts of octyl, dodecyl or hexadecyl bromide. The surface properties and parameters were investigated to find the relationship between the structures of the hydrophobic portion of such compounds. The properties studied include surface tension, critical micelle concentration (CMC), effectiveness (Π cmc ), maximum surface excess (Γ max ) and minimum surface area (A min ) were investigated with respect to different concentrations at 25 °C. Standard free energies of micellization and adsorption of the prepared surfactants in the aqueous solution were studied. The values of Γ max , standard free energies of micellization Δ G mic oand adsorption Δ G ads owere found to increase with the chain length, while the cmc and minimum surface area occupied by one molecule A min were found to decrease. The biocidal activity was determined through the inhibition zone diameter of prepared compounds which were measured against five strains of a representative group of microorganisms.