Fluorescence Quenching in Microheterogeneous Media: A Laboratory Experiment Determining Micelle Aggregation Number

1995 ◽  
Vol 72 (7) ◽  
pp. 662 ◽  
Author(s):  
M. Flor Rodríguez Prieto ◽  
M. Carmen Ríos Rodríguez ◽  
Manuel Mosquera González ◽  
Ana M. Ríos Rodríguez ◽  
Juan Carlos Mejuto Fernández
Keyword(s):  
Fluorescence Quenching ◽  
Laboratory Experiment ◽  
Aggregation Number ◽  
Micelle Aggregation Number ◽  
Microheterogeneous Media

scholarly journals Determination of micelle aggregation numbers of alkyltrimethylammonium bromide and sodium dodecyl sulfate surfactants using time-resolved fluorescence quenching

2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Martin Pisárčik ◽  
Ferdinand Devínsky ◽  
Matúš Pupák
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Concentration Dependence ◽  
Anionic Surfactant ◽  
Cationic Surfactants ◽  
Aggregation Number ◽  
Sodium Dodecyl ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Micelle Aggregation Number ◽  
Sds Micelle

AbstractThe time-resolved fluorescence quenching method was applied to determine the micelle aggregation number of cationic single-chain surfactants dodecyltrimethylammonium bromide (DTAB), cetyltrimethylammonium bromide (CTAB) and anionic surfactant sodium dodecyl sulfate (SDS). The concentration dependence of micelle aggregation number was found to be linear for all investigated surfactants in the concentration range 2‒15 × the value of critical micelle concentration of the respective surfactant. The values of micelle aggregation number were found in the range 30‒77. Different trends in the linear concentration dependence of micelle aggregation number were observed for cationic surfactants and for the anionic surfactant SDS. A small slope value was found for cationic surfactants, while the SDS micelle aggregation number concentration dependence showed significantly a larger slope value. The aggregation number increase with the increasing SDS concentration results in the micellar growth. Results from a simple analysis based on computer models of cationic and anionic surfactant molecules with dodecyl chains supports, the formation of intramicellar hydrogen bonding between surfactant molecules in SDS micelle shell.

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