Hydrophobicity enhancement in micelles of Triton X-165 by the presence of the cosolvent 2,2,2 trifluoroethanol (TFE)
作者： Concepción Civera , Concepción Arias , María A. Elorza , Begoña Elorza , Francisco García-Blanco
DOI: 10.1016/J.MOLLIQ.2014.08.017
关键词:
摘要: Abstract This work focuses on the effect of 2,2,2-trifluoroethanol (TFE) certain micellar properties Triton X-165 (TX-165) in aqueous solutions. The results obtained from various experimental techniques are used to interpret interactions systems studied. added TFE has strong lowering cloud point (CP) solutions TX-165. is consistent with partial dehydration oxyethylene groups micelle. decrease both critical micelle concentration (CMC) and CP increase justified by interaction between molecule group TX-165, low hydrogen bond ability hydroxyl oxygen atom water structure maker TFE. aggregation number determined fluorescence decreases initially then increases for highest concentrations. Fluorescence quenching data indicate that about 45% pyrene probe accessible quencher (TFE). viscosity ellipsoidal shape TX-165 micelles. changes intrinsic increasing may reflect solvation micelles conformational polar head These factors affect packing monomers number. cosolvent confers hydrophobicity
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