Keywords
dimeric surfactants
pyrene
premicellar aggregation
How to Cite
Abstract
Two series of alkanediyl-a,w-bis (dimethylalkylammonium bromide (n-2-n and n-6-n; n=8, 10,12,and 16) have been synthesized and their micelles properties studied in aqueous solution using pyrene,
pyrenecarboxaldehyde (PCA) and 1,8 anilinonaphtalene sulfonic acid sodium salt (ANS) as fluorescent
probes. The micelles from these surfactants have been characterized on the basis of the information
provided by micelle-solubilized fluorescent probes. The obtained results indicated that the surfactant
concentration at which a marked decrease in l max parameter of pyrenecarboxaldehyde (PCA) occurs
corresponds to the CMC determined by conductimetric measurements. Changes in the emission spectra
of ANS and PCA observed in the submicellar range for both surfactants series (n-2-n and n-6-n) were
interpreted as formation of pre-aggregates. It was found that the dimeric surfactants with long spacer (s=
6) form more hydrated aggregates when compared with those formed by the n-2-n and C n TAB surfactants
series. This was attributed to a more difficult packing of n-6-n surfactant molecules to form micelles.
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