Study of C12-2-En-C12×2Br Preaggregation Behavior in Aqueous Solution by 1-Pyrenebutyric Acid Fluorescence Probe

The premicellization of C₁₂-2-En-C₁₂×2Br in an aqueous solution has been investigated by the steady state fluorescence method using 1-Pyrenebutyric acid (PBA) as the probe. The critical premicelle concentrations (cpc) at 30oC were 0.0295（n=1），0.0373（n=2）and 0.0501（n=3）mmol/L, respectively. Compared with the traditional method (i.e., conductivity method), the steady state fluorescence method is more sensitive to illustrates the premicellar behavior of gemini surfactants，and it is a suitable method for the determination of critical premicelle concentrations of gemini surfactants.