Abstract: The aqueous dispersions of C. I. Disperse Blue 79 of different concentrations were prepared in the presence of anionic or nonionic surfactants in this research. The influences of simple inorganic electrolyte on the stability and the electrokinetic properties of the dispersions were studied by using the settlement value as the stability parameter, and the electrokinetic potential as the parameter of the electric double layer of the particles. Good agreement was obtained between the two parameters. The results showed that the simple inorganic electrolyte might initially increase the stabilities of the dispersions at low concentration by assisting the building-up of the electric double layer, but decrease the stabilties by compressing this double layer when its concentration went beyond a critical value. Although the increase of the adsorption of surfactants on the dye particles caused by the increasing concentration of the electrolyte might increase the absolute value of the electrokinetic potential and there are increase the stabilities of the dispersions, the direct influence of the electrolyte on the electrie double layer was always dominant.

摘要： 本文制备了不同浓度的阴离子表面活性剂或非离子表面活性剂—分散染料(C.I.分散蓝79)水分散体系,并以沉降度作为分散体的稳定参量,动电位为颗粒电结构参量,研究了无机电解质对这些分散体的稳定性和动电性质的影响。动电性质实验和沉降实验良好符合。结果表明,较低浓度的无机电解质能辅助扩散双电层的建立从而增加分散体稳定性;当其浓度超过某临界值时又会压缩双电层从而成为不稳定因素。尽管电解质浓度增大使表面活性剂在染料颗粒表面吸附量增大,但电解质对双电层的直接影响始终占主导地位。