Study on Aggregation Properties of Nonionic Surfactant of Fatty Alcoholpolyoxyethylene Ether by Steady-state Fluorescence Probe Method

Taken the pyrene as the fluorescence probe and diphenyl ketone as quencher,three different structure fatty alcohol-polyoxyethylene ether(FAPE) surfactants of steady-state fluorescence spectrum were determined by fluorescence probe method.A kind of method about FAPE surfactant of critical micelle concentration(CMC) and critical micelle aggregation number(Nm) was established.Ensure the proper concentration of fluorescence probe is 6×10-6mol/L,the proper concentration range of quencher is 0.06~0.12mmol/L.According to relationship fluorescence intensity ratio of pyrene I336/I394 with surfactant concentration of aqueous solution.CMC values for stright-chain,branched-chain,aromatics alcohol ether were 0.2mmol/L,0.1mmol/L,0.05mmol/L,respectively,Nm values for stright-chain,branched-chain,aromatics alcohol ether were 1168,255,6.0.The experimental results showed that the FAPE series nonionic surfactant,critical micelle concentration and micelle aggregation number decrease as carbon chain structure from straight-chain→ branched-chain→aromatics.