Potassium N-lauroyl glycinate (PLG) is an amino acid surfactant widely used in detergents and has excellent chemical properties. In the present work, PLG was mixed in different molar ratios (α 1 ) with the commonly used amphoteric surfactant lauryl amidopropyl betaine (LAB) or the non-ionic surfactant alkyl glycoside (APG). Subsequently, the surface tension, average hydrodynamic radius and number of micellar aggregates of the individual surfactants and the compound systems were measured using the hanging plate method, dynamic light scattering and fluorescence probe method, respectively, and the corresponding surface activity parameters were calculated. The results show that the binary PLG/LAB and PLG/APG systems exhibit non-ideal behaviour and that there was mutual attraction in the systems. The broad distribution of the micelle radius of the PLG/LAB compound system indicates that there are two types of micelles, namely spherical and rod-shaped in the systems. The distribution of the micelle radius of the PLG/APG compound system decreases to the minimum value at α 1 = 0.5. At α 1 = 0.7 and 0.9, double peaks and a broad distribution were also observed. The number of micelle aggregates in the PLG/LAB and PLG/APG compound systems is less than that of the individual surfactants at the respective mole fractions.

中文翻译：

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N-月桂酰甘氨酸钾二元复合体系的协同效应及形态研究

N-月桂酰甘氨酸钾（PLG）是一种广泛用于洗涤剂的氨基酸表面活性剂，具有优异的化学性能。在目前的工作中，PLG 以不同的摩尔比 (α 1 ) 与常用的两性表面活性剂月桂酰氨基丙基甜菜碱 (LAB) 或非离子表面活性剂烷基糖苷 (APG) 混合。随后，分别采用悬板法、动态光散射法和荧光探针法测量了各表面活性剂和复合体系的表面张力、平均流体动力学半径和胶束聚集体数，并计算了相应的表面活性参数。结果表明，二元PLG/LAB和PLG/APG系统表现出非理想行为，并且系统之间存在相互吸引。PLG/LAB复合体系胶束半径的广泛分布表明体系中存在球形和棒状两种胶束。PLG/APG 复合体系的胶束半径分布在α 1 = 0.5 时降至最小值。在 α 1 = 0.7 和 0.9 时，还观察到双峰和宽分布。PLG/LAB 和 PLG/APG 复合体系中胶束聚集体的数量少于各自摩尔分数的单个表面活性剂的数量。