Aggregation behavior of N-alkyl perfluorooctanesulfonamides in dimethyl sulfoxide solution

Journal of Colloid and Interface Science
Guo-Li LiJin-Xin Xiao

Abstract

N-alkyl perfluorooctanesulfonamides (C8F17SO2NHCnH2n+1, FC8-HCn, n = 2, 4, 6, 8) were shown to form aggregates in dimethyl sulfoxide (DMSO). Surface tension results revealed that the dissolution of FC8-HCn reduced the surface tension of DMSO in a manner analogous to common surfactants in aqueous solutions. Maximum surface excess amount (Gamma(max)) and minimum surface area per molecule (Amin) at the air-liquid interface were estimated. Gamma(max) decreases and Amin increases with an increase of the hydrocarbon chain length of FC8-HCn. Steady-state fluorescence and NMR measurements demonstrated that both fluorocarbon and hydrocarbon chains of FC8-HCn molecules were incorporated inside the aggregates. UV-vis spectroscopy confirmed the formation of aggregates and determined the critical micelle concentration (cmc) of FC8-HC6 and FC8-HC8 solutions. The thermodynamic parameters DeltaG(0)(agg), DeltaH(0)(agg), and DeltaS(0)(agg) for the aggregate formation of FC8-HCn in DMSO derived from the temperature dependence of the cmc revealed that the aggregate formation is an enthalpy-driven process, which was further confirmed by isothermal titration calorimetry (ITC) measurements. Moreover, the absolute values of DeltaG(0)(agg) and DeltaH(...Continue Reading

References

Apr 25, 2003·Journal of Pharmaceutical Sciences·Ping Li, Luwei Zhao
Mar 19, 2004·Journal of Colloid and Interface Science·Wenjian HuangDarryl Y Sasaki
Dec 13, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Caroline SeguinRobert M Dalgliesh
Mar 14, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Caroline SeguinIsabelle Grillo
Aug 7, 2007·Journal of Colloid and Interface Science·Caroline SeguinIsabelle Grillo

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Citations

Jan 4, 2012·Journal of Molecular Recognition : JMR·Rajesh GhaiBrett M Collins
May 2, 2013·The Journal of Physical Chemistry Letters·Vitaly V Chaban, Oleg V Prezhdo

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