Size of Micelles Determined by Static Fluorescence Quenching

Jiann‐Jong ‐J Jeng, Jin‐Ming ‐M Chen, Chung‐Yuan ‐Y Mou

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We developed a new method to measure the average aggregation number of large rod‐like micelles using static fluorescence self‐quenching of a solubilized fluorophore. The method is based on the increase of self‐quenching of micelle‐solubilized pyrene through excimer formation. We consider the effect of random distribution of pyrene in micelles and the micellar size distribution. The measured average aggregation <n> M is based on a new M‐weighted raging similar to our exponential‐weighted averaging in the transient decay method. We apply this method to study the effect of a large concentration of salt on the average aggregation behavior of sodium dodecyl sulfate (SDS) and cetyle tetraammonium bromide (CTAB). The sizes increase with increasing ionic concentrations. For SDS, we used the thermodynamic model developed by Missel et al. to calculate < n > M which we compare with experimental results.

Original languageEnglish
Pages (from-to)513-520
Number of pages8
JournalJournal of the Chinese Chemical Society
Issue number6
Publication statusPublished - Dec 1991
Externally publishedYes


  • Critical micelle concentration
  • Excimer formation
  • Exponent‐weighted average aggregation number
  • Fluorescence probe
  • Mass‐weighted average aggregation number
  • Micellar solution

ASJC Scopus subject areas

  • General Chemistry


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