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7969804 
Book/Book Chapter 
[Aggregation behavior of Span-80 in cyclohexane by steady-state fluorescent probe] 
Zhao, H 
2011 
American Applied Sciences Research Institute 
La Puenta, CA 
2011 AASRI Conference on Artificial Intelligence and Industry Application (AASRI-AIIA 2011), vol. 4 
344-347 
Chinese 
WOS:000398853900087 
The aggregation behavior of span-80 in cyclohexane has been investigated by the steady-state fluorescent probe with pyrene (Py) as the probe and diphenyl ketone as the quencher. The ratio variation of monomer pyrene's first vibronic band intensity I-1 (lambda=373nm) and third one I-3 (lambda=384.4nm) with span-80 concentration (Cs) was examined to determine the span-80's critical micelle concentration (CMC). The micellar aggregation number (N) of span-80 was obtained via the linear relationship between the natural logarithm of I-1 and the concentration of diphenyl ketone. The Results showed that there were two catastrophe points in the developing trend of I-1/I-3. At the first catastrophe point (C-s =0.7x10(-3)mol/L) span-80 molecules fully covered the solution's surface, and at the second point the formed micelle notably influenced the solution's properties and thus the corresponding span-80 concentration of 0.035mo1/L was considered as CMC. The aggregation behavior of span-80 can be recognized as three stages based on variation of the micellar aggregation number with span-80 concentration. The first stage was for the increase of micelle concentration, the second was for the linear increase of micellar aggregation number, and the third was for the formation of more complicated micelle. The critical micellar aggregation number could not be reasonable to be obtained by extrapolating the linear relationship in the second stage while ignoring the first stage. 
Deng, W 
9781937728021 
AASRI Conference on Artificial Intelligence and Industry Application (AASRI-AIIA 2011) 
Male, Maldives 
May 23-24, 2011