Fernández-Peña Laura, Guzmán Eduardo, Oñate-Martínez Teresa, Fernández-Pérez Coral, Ortega Francisco, Rubio Ramón G, Luengo Gustavo S
Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain.
Centro de Espectroscopía y Correlación, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain.
Polymers (Basel). 2023 Jul 12;15(14):3011. doi: 10.3390/polym15143011.
This work investigates the effect of dilution on the phase separation process of binary charged polysaccharide-surfactant mixtures formed by two cationic polysaccharides and up to four surfactants of different nature (anionic, zwitterionic, and neutral), as well as the potential impact of dilution-induced phase separation on the formation of conditioning deposits on charged surfaces, mimicking the negative charge and wettability of damaged hair fibers. The results obtained showed that the dilution behavior of model washing formulations (concentrated polysaccharide-surfactant mixtures) cannot be described in terms of a classical complex precipitation framework, as phase separation phenomena occur even when the aggregates are far from the equilibrium phase separation composition. Therefore, dilution-enhanced deposition cannot be predicted in terms of the worsening of colloidal stability due to the charge neutralization phenomena, as common phase separation and, hence, enhanced deposition occurs even for highly charged complexes.
本研究考察了稀释对由两种阳离子多糖和多达四种不同性质（阴离子型、两性离子型和中性）表面活性剂形成的二元带电多糖 - 表面活性剂混合物相分离过程的影响，以及稀释诱导的相分离对带电表面上调理沉积物形成的潜在影响，模拟受损毛发纤维的负电荷和润湿性。所得结果表明，模型洗涤配方（浓缩多糖 - 表面活性剂混合物）的稀释行为不能用经典的复合沉淀框架来描述，因为即使聚集体远离平衡相分离组成时也会发生相分离现象。因此，由于电荷中和现象导致胶体稳定性变差，无法预测稀释增强的沉积，因为即使对于高电荷复合物也会发生常见的相分离，从而增强沉积。
