Interaction between Anionic Dye ECAB, Micelle of Triton X-100 in Aqueous Solution and Hemimicelie at Solid/Liquid Interface

Abstract

Interaction between dye (ECAB), nonionic surfactant (TX-100) micelle in aqueous solution and TX-100 hemimicelie at solid (SiO₂)/liquid interface has been investigated quantitatively. There are linear relationships between concentrations of free ECAB(C_a), ECAB bound with TX-100 micelles in solution(C_m) and ECAB bound with TX-100 hemimicelles at interface of solid/liquid(C_hm). The slopes of the three straight lines are 0.32 for C_hm∼C_a -1.32 for C_m∼C_a and -1.00 for (C_m+C_hm∼C_a respectively. The linear relationships can be described by three linear equations as follows: C_hm=0.32 (C_a−O.88×10⁻⁵),C_m.=4.0×10⁻⁵-l.33 C_a and C_hm+C_m=3.742×l0⁻⁵-C_a,. It is inferred that the interaction between ECAB, TX-100 micelles and TX-100 hemimicelles is essentially partition of ECAB molecules in solution, TX-100 micelles and hemimicelles. The concentration of ECAB bound with TX-100 micelles well as electronic repulsion. Additionally, A quantitative method to determine adsorbance of surfactant TX-100 on silica gel by spectroscopy in coadsorption conditions of dye (ECAB) and TX-100 was proposed.