十二烷基硫酸钠在纤维／溶液界面吸附的研究

Study on the Adsorption of C_(12)H_(25)OSO_3Na on the Interface of Fibers/Solutions by the Surface Tension Method

用滴体积测表面张力的方法作出了１５℃时纯棉和纯毛纤维在不同ｐＨ值和盐浓度的水溶液中对十二烷基硫酸钠的吸附及脱附等温线．发现在不含盐及中性水溶液中，表面带负电的纯棉仍对Ｃ１２Ｈ２５ＯＳＯ３－负离子有少量吸附．讨论了溶液中加盐和降低溶液ｐＨ值时棉和毛对十二烷基硫酸钠的吸附量、吸附等温线的形状、临界表面胶团浓度（ＨＭＣ）以及表面胶团聚集数的变化．首次估算了表面胶团聚集数，并讨论了相应的吸附原因和吸附层结构．

The adsorption and/ or desorption isotherms of sodium dodecylsulfate(C12 H25OSO3Na) on the sufaces of both the clean cotton fibre and the clean wool fibre of the various pH and salt concentrations at 15 ℃ were obtained by the surface tension method. It was found that the clean cotton fibre which is negatively charged in the neutral and salt-free aqueous solution can still adsorb a certain amount of the anion C12H25OSO3-. The effects of deducing the pH and adding the salt concentration in the solutions, from which C12H25OSO3Na is absorbed on the surfaces of both the clean cotton and the clean wool fibres, on the adsorption amounts, the shapes of tth adsorption isotherms,the critical hemimicelle concetrations (HMC) aam the aggregation numbers of the hemimicelle were studied in detail. The aggregation numbers of the hemimicelle for the studied adsorption systerms were estimated firstly, and the possible adsorption mechanism the the construction of the adsorbed layers for them were also discussed.