十二烷基硫酸钠的临界胶束浓度的测定及影响分析

Determination of Sodium Dodecyl Sulfate Critical Micelle Concentration and Impact Analysis

临界胶束浓度（CMC）是表面活性剂活性的度量。采用电导法测定表面活性剂十二烷基硫酸钠的临界胶束浓度,并探讨了温度、NaCl或乙醇等对临界胶束浓度的影响。随着温度的升高,CMC增大;NaCl的加入量增大时,CMC在较低浓度下增大,在0.2~0.8 mmol/L范围内CMC随NaCl的量增大而降低;乙醇的加入量随体积比从0%~2.5%增大时,CMC增大,并分析了SDS的CMC发生变化的原因。

Critical micelle concentration is a measure of surfactant activity. The critical micelle concentration（ CMC） of the surfactant sodium dodecyl sulfate was determined by conductance method. The impact of temperature, sodium chloride and ethanol were discussed. With the temperature rised,CMC increased. When amount of sodium chloride increased,CMC of sodium dodecyl sulfate increased at low concentration. The amount of sodium chloride increased,CMC of sodium dodecyl sulfate decreased from 0. 2 to 0. 8mmol / L. With the addition of ethanol volume ratio increases from 0% ~ 2. 5%,CMC increased. The cause of change in CMC of sodium dodecyl sulfate was analyzed.