N-十二烷基-N-羟乙基氯化铵的性能研究

Properties of N-alkyl-N-hydroxyethyl ammonium chloride

用滴体积法对合成纯化所得 N -烷基 -N-羟乙基氯化铵 (AEAC)水溶液测定表面张力发现 ,随着 N原子上羟乙基数的增加 ,AEAC的临界胶束浓度降低 ,但此时的表面张力上升。 AEAC胶束化的主要驱动力是熵变。 AEAC的表面过剩浓度随 N原子上羟乙基数的增加而增加 ,但表面分子面积减小。 AEA

The surface tension of N alkyl N hydroxyethyl ammonium chloride (AEAC) synthesized and purified was determined by drop volume method. With the increasing of the number of hydroxyethyl,the critical micelle concentration (cmc) decreased while the surface tension at cmc increased. The entropy change is the main drive force for the micelle formation. With the increase of the number of the hydroxyethyl on nitrogen atom,the surface excessive concentration of AEAC was increased. However, the area of AEAC molecule at the surface of aqueous solution was decreased. The efficiency of AEAC in decreasing surface tension was increased with the increase of the number of the hydroxyethyl.