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本工作研究了十二烷基三羟乙基氯化铵(C_(12)NE)和十二烷基硫酸钠(C_(12)SNa),十二烷基三羟乙基氯化铵(C_(12)NE)和八烷基硫酸钠(C_8SNa)两体系的正、负离子表面活性剂混合溶液的表面吸附和胶团形成。用液体积法测定了一系列不同比例C_(12)NE～C_(12)SNa、C_(12)NE～C_8SNa混合水溶液在25℃、总离子强度为0.1000m时的表面张力,用Gibbs公式计算了总吸附量和分吸附量。另外,初步探索了混合溶液的某些胶团性质。结果表明: 1.正、负离子表面活性剂混合物具有较高的表面活性。等摩尔C_(12)NE～C_(12)SNa混合溶液的cmc为4.0×10~(-5)m,分别为单个C_(12)SNa、C_(12)NEcmc的1/208和1/240。等摩尔C_(12)NE～C_8SNa混合溶液的cmc为7.4×10~(-4)m,分别为单个C_(12)NE、C_8SNa cmc的1/13和1/189。 2.对于碳原子数相同(如C_(12)NE～C_(12)SNa)的正、负离子表面活性剂的混合溶液,不论其混合比例如何,在饱和吸附时,总吸附量接近6.7×10~(-10)mol/cm~2,吸附层中也是近于等摩尔吸附,每个分子所占面积约为25A~2,这是由于正、负表面活性剂离子之间相互强烈作用导致表面层中成紧密排列结构。 碳原子数不同的正、负离子表面活性剂(如C_(12)NE～C_8SNa)的混合溶液,不论其比例如何,其饱和吸附时总吸附量接近5.4×10~(-10)mol/cm
In this work, the effects of dodecyl trihydroxyethyl ammonium chloride (C_ (12) NE) and sodium lauryl sulfate (C_ (12) SNa), dodecyl trihydroxyethyl ammonium chloride (12) NE) and sodium octadecylsulfate (C_8SNa) system of positive and negative surfactant mixed solution surface adsorption and micellar formation. The surface tension of a series of mixed aqueous solutions of C12N12-C12Na-C12Na-C_8SNa at 25 ° C and a total ionic strength of 0.1000 m was determined by the liquid volume method and was calculated by Gibbs formula The total amount of adsorption and adsorption capacity. In addition, some micellar properties of the mixed solution were initially explored. The results showed that: 1. Positive and negative ion surfactant mixtures with high surface activity. The cmc of equimolar mixture of C 12 NE ~ C 12 Sna was 4.0 × 10 ~ (-5) m, which was respectively 1/208 and 1/240 of single C 12 SNa and C 12 Ncmc . The cmc of the equimolar mixture of C 12 NE ~ C_8SNa was 7.4 × 10 ~ (-4) m, which was 1/13 and 1/189 of the single C_ (12) NE and C_8SNa cmc, respectively. 2. For the mixed solution of positive and negative surfactants with the same carbon number (such as C 12 NE-C 12 SNa), the total adsorption capacity is close to 6.7 × 10 ~ (-10) mol / cm ~ 2, the adsorption layer is also nearly equimolar adsorption, each molecule occupies an area of about 25A ~ 2, which is due to the strong interaction between positive and negative surfactant ions lead to the surface Layer into a close arrangement of the structure. Regardless of its ratio, the total adsorption capacity of the mixed solution of positive and negative ion surfactants (such as C 12 NE-C 8 SNa) with different carbon atoms is close to 5.4 × 10 -10 mol / cm