Abstract

Interactional study of triphenylmethane-based cationic dye i.e., basic violet-4 dye (BV) in the mixed-micellar system of two anionic surfactants viz. sodium dodecyl sulfate (NaDS) and sodium stearate (NaS) is encompassed in this manuscript. The composite micelles of nonionic surfactant triton X-100 (TX) served as better colloidal carriers to facilitate aggregation, deep penetration, and stability of dye molecules than single surfactants. The thermodynamics of the micellization was assessed conductometrically, whereas the extent of dye-surfactant interaction was quantified spectroscopically. The nonionic/anionic mixture favored micellization and lowered critical micellar concentration (CMC). Furthermore, it is observed that dye partitioning, binding, and micellization were spontaneous processes. The thermodynamic parameters including entropy, enthalpy, and Gibb’s free energy of micellization along with the determination of the CMC, degree of ionization are also explained. The parameters in terms of partition constant, partition coefficient, binding constant, Gibb’s free energy of partition, and binding were calculated from differential absorption spectroscopy. The comparative study revealed that NaDS/TX showed superior performance in dye penetration as compared to NaS/TX system.

摘要

基于三苯甲烷的阳离子染料即碱性紫 4 染料 (BV) 在两种阴离子表面活性剂的混合胶束体系中的相互作用研究，即。本手稿包含十二烷基硫酸钠 (NaDS) 和硬脂酸钠 (NaS)。非离子表面活性剂 triton X-100 (TX) 的复合胶束作为比单一表面活性剂更好的胶体载体，促进染料分子的聚集、深度渗透和稳定性。胶束化的热力学是通过电导法评估的，而染料-表面活性剂相互作用的程度是通过光谱法量化的。非离子/阴离子混合物有利于胶束化并降低临界胶束浓度 (CMC)。此外，观察到染料分配、结合和胶束化是自发过程。热力学参数包括熵，还解释了焓和胶束化吉布自由能以及 CMC 和电离度的测定。分配常数、分配系数、结合常数、分配的吉布斯自由能和结合方面的参数由差示吸收光谱计算。比较研究表明，与 NaS/TX 系统相比，NaDS/TX 在染料渗透方面表现出更优异的性能。