利用电导法和表面张力法,研究了离子液体表面活性剂溴化1-十二烷基-3-甲基咪唑(C12 mimBr)与阴离子染料甲基橙(MO)之间的相互作用.通过分别测定C12mimBr、MO以及C12 mimBr与MO混合溶液的电导率,计算了C12mimBr与MO的结合特性.C12mimBr与MO以等摩尔比结合,在288.1、298.1和308.1 K下的结合常数分别为4.89×105、4.88×104和5.76×103 L/mol,该结合反应属于焓驱动的自发放热反应.分别测定了C12 mimBr与MO等摩尔混合体系及其在NaBr溶液中的临界胶束浓度(cmc),加入MO使C12 mimBr的cmc从9.1×10-3 mol/L降低到7.3×10-5 mol/L,显著提高了C12mimBr的表面活性.
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