Nivard Maud, Ortega Francisco, Rubio Ramón G, Guzmán Eduardo
Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Cité Scientifique-Bât. C7, Avenue Mendeleïev-CS 90108, 59652 Villeneuve D'Ascq Cedex, France.
Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria, Plaza de la Ciencias s/n, 28040 Madrid, Spain.
Polymers (Basel). 2025 Jan 15;17(2):207. doi: 10.3390/polym17020207.
This study examines the adsorption and bulk assembly behaviour of quaternized hydroxyethylcellulose ethoxylate (QHECE)-sodium dodecyl sulphate (SDS) complexes on negatively charged substrates. Due to its quaternized structure, QHECE, which is used in several industries, including cosmetics, exhibits enhanced electrostatic interactions. The phase behaviour and adsorption mechanisms of QHECE-SDS complexes are investigated using model substrates that mimic the wettability and surface charge of damaged hair fibres. Two preparation methodologies, and , were employed to examine their impact on the complex equilibrium, phase behaviour, and adsorption properties of the complexes. The measurements of turbidity, electrophoretic mobility, and conductivity demonstrate the existence of nonequilibrium dynamics during the mixing process, which exert a significant influence on the structural and functional characteristics of the complexes. The quartz crystal microbalance with dissipation monitoring (QCM-D) was employed to investigate the adsorption of the complexes onto the substrates. The results demonstrated the critical role of intermediate SDS concentrations in enhancing deposition. The findings emphasise the importance of formulation and preparation protocols in designing stable, high-performance cosmetic products. This research advances our understanding of polyelectrolyte-surfactant interactions and provides insights into optimising QHECE-based formulations.
本研究考察了季铵化羟乙基纤维素乙氧基化物（QHECE）-十二烷基硫酸钠（SDS）复合物在带负电荷底物上的吸附和本体组装行为。由于其季铵化结构，QHECE在包括化妆品在内的多个行业中使用，表现出增强的静电相互作用。使用模拟受损毛发纤维润湿性和表面电荷的模型底物研究了QHECE-SDS复合物的相行为和吸附机制。采用两种制备方法， 和 ，来考察它们对复合物平衡、相行为和吸附性能的影响。浊度、电泳迁移率和电导率的测量表明，混合过程中存在非平衡动力学，这对复合物的结构和功能特性有显著影响。采用带耗散监测的石英晶体微天平（QCM-D）研究复合物在底物上的吸附。结果表明，中间SDS浓度在增强沉积方面起着关键作用。这些发现强调了配方和制备方案在设计稳定、高性能化妆品中的重要性。本研究推进了我们对聚电解质-表面活性剂相互作用的理解，并为优化基于QHECE的配方提供了见解。
