【摘要】 实验探索了脂肪醇聚氧乙烯醚硫酸盐 (AES)、氯化十六烷基吡啶 (CPC)、β -萘磺酸聚合物 (NS)以及烷基酚聚氧乙烯醚 (TX -10 )等四种不同类型的表面活性剂在普通硅酸盐水泥表面的吸附行为。研究表明 ,AES在水泥颗粒表面的吸附是一种快吸附 ,属于LS型 ;CPC在水泥颗粒表面的吸附过程则是一种慢吸附 ,受动力学因素所控制 ;NS的吸附量与其浓度成线性关系 :TX -10则基本上不被吸附。结果显示 ,被吸附的三种表面活性剂都是疏水基朝向水相 ,增加了水泥颗粒的疏水性。然而AES随着添加量的增大 ,由于吸附胶束的形成 ,使水泥颗粒表面经由亲水 -疏水 -亲水的变化过程。从表面电荷的变化来看 ,AES、NS的添加均使水泥表面Zeta电位有所增加 ,而CPC却使得水泥颗粒表面从带负电变到带正电。文中所提出的改进Stern双电层模型能很好地说明几种表面活性剂在水泥颗粒表面的吸附特性更多还原

【Abstract】 WT5”BZ]:On the surface of Portland cement, four surfactants have different adsorptive behaviors: ethoxylated fatty alcohol sulfate(AES) belongs to LS type of adsorption; cetyl piridinium chloride(CPC) is kinetically controlled; condensates of naphthalene formaldehyde (NS) has a linear relationship of adsorbance vs. concentration; and ethoxylated alkyl phenol (TX-10) does not be adsorbed. All adsorbed surfactants have hydrocarbon chain toward liquid phase and increase hydrophobicity of cement surface. However, AES suffered a change of hydrophilic → hydrophobic → hydrophilic because of formation of adsorptive micelle. Both AES and NS only increase zeta-potential, but CPC changes zeta-potential from negative to positive. A modified stern double-layer model has been proposed to illustrate adsorptive characteristics of above surfactants.更多还原