The Effect of the Number of Hydrophobic Carbon Atoms on the Aggregation Behavior of Amphoteric Surfactant was Studied by Pyrene Steady-state Fluorescence Method
In order to study the effect of hydrophobic carbon atomic number on the aggregation behavior of amphoteric surfactants,the critical micellar concentration(CMC)of sodium sulfonate amphoteric surfactants(Sm)with hydrophobic carbon atomic number(m)of 12,14,16 and 18 was determined by using hydrophobic pyrene as a fluorescent probe,and the micropolarity of the synthesized samples was determined.Based on the relationship between fluorescence intensity ratioI1/I3at 373 nm and 384 nm and sample concentration,CMC of S12～S18 is 7.90×10-4 mol/L,5.39×104 mol/L,4.72×10-4 mol/L,4.14×10-4 mol/L,respectively.The equilibrium I1/I3 were 1.667,1.211,1.272 and 1.294,respectively.The results showed that with the increase of the number of hydrophobic carbon atoms,the ability of the synthesized sample to form ordered aggregates was enhanced,and the surface activity of the synthesized sample was increased,among which the sample S14 with the number of hydrophobic carbon atoms was 14 formed the tightest aggregate structure.
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