We used the static fluorescence method to determine the aggregation number and found that this number is less than 10.
if you know the surfactant molecular size and you can determine the size of the aggregates formed, you could estimate the number of surfactant molecules in the aggregates. Afterthat, you could relate the fluorescence results to the calculations.
What kind of surfactant, at which concentration and what is the environment. Could there be an analytical error? Any indication of aggregation by a second method?
Knowing the cmc light scattering (or scattering in general) could provide you the answer.
Dear Karen,
does this work in aqueous environment? There are a huge number of hydrogen bonds.
In a recent work, we could determinereliable aggregation numbers of some pluronic block copolymer (EOx-POy-EOx) using differential scanning calorimetry. However, some conditions have to be met in order to apply this method. Have a look at: http://pubs.acs.org/doi/abs/10.1021/la303599d
do PGSE NMR measurements. You can determine how much polymer is free and how much is into an aggregate.
Many good techniques, but all have suitability for certain concentration ranges and contrast between free and micellised surfactant. In my lab we would use small angle scattering or PFG NMR.
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