荧光探针法测定脂肪醇聚氧乙烯醚非离子表面活性剂的临界胶束浓度

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1、---------------------------------------------------------------范文最新推荐------------------------------------------------------荧光探针法测定脂肪醇聚氧乙烯醚非离子表面活性剂的临界胶束浓度15/16---------------------------------------------------------------范文最新推荐-----------------------

2、-------------------------------荧光探针法测定脂肪醇聚氧乙烯醚非离子表面活性剂的临界胶束浓度15/16---------------------------------------------------------------范文最新推荐------------------------------------------------------摘要：以芘为荧光探针，二苯甲酮为猝灭剂，采用稳态荧光探针法测定了聚氧乙烯（21）硬脂基醚（Brij721）表面活性剂增溶芘

3、后的稳态荧光光谱，建立了Brij721非离子表面活性剂的临界胶束浓度（CMC）和临界胶束聚集数（Nm）的测试方法。根据I322/I337与Brij721浓度变化的关系，可得到Brij721的临界胶束浓度为3.45×10-6mol/L。确定荧光探针芘的适宜浓度Cp为6×10-7mol/L，猝灭剂的适宜浓度CQ范围取为0.002～0.003mmol/L，表面活性剂溶液浓度为3~12倍CMC时，胶束聚集数(N)随表面活性剂浓度增大而线性增大，并用线性拟合作图法得到Brij721

4、的临界胶束聚集数为9。同时，外部添加的试剂如无机盐、乙醇均影响其临界胶束浓度。7833关键字：荧光探针法；临界胶束浓度；临界胶束聚集数；脂肪醇聚氧乙烯醚DeterminationofCriticalMicelleConcentration(CMC)ofNonionicSurfactantofFattyAlcohol-polyoxyethyleneEtherbySteady-StateFluorescenceProbeMethodAbstract:Takenthepyreneasthefluore

5、scenceprobeanddiphenylketoneasquencher,thesteady-statefluorescencespectrumofPolyoxyethylene(21)stearylether(Brij721)surfactantwasdeterminedbyfluorescenceprobemethod.Asensitivemethodfordeterminingcriticalmicelleconcentration(CMC)andcriticalmicelleaggr

6、egationnumber(Nm)ofBrij721surfactantwasestablished.AccordingtothechangeoffluorescenceintensityratioofpyreneI322/I337withthechangeofsurfactantconcentrationofaqueoussolution,CMCvalueforBrij721was3.45×10-6mol/L.Ensuretheproperconcentrationoffluore

7、scenceprobeis15/16---------------------------------------------------------------范文最新推荐------------------------------------------------------6×10-7mol/L,theproperconcentrationrangeofquencheris0.002~0.003mmol/L,theaggregationnumber(N)increasesli

8、nearlywiththeincreaseofBrij721concentrationintherangeof3~12timesofCMCandNmwhichis9canbeextrapolatedfromN-Cfittingcurve.Inaddition,theexternallyaddedreagentssuchassaltsandethanolalsoinfluenceCMC.2.4.3胶束聚集数（N）的测定123结果与讨论133.1聚氧乙烯（21）硬脂基醚的稳态荧光光谱133.1.1不