The synthesis and surfactant activities of two new cationic gemini surfactants containing triazole compound as spacer were described. Their critical micelle concentrations (CMC), which are 1.8×10-4 mol/L and 3.9...The synthesis and surfactant activities of two new cationic gemini surfactants containing triazole compound as spacer were described. Their critical micelle concentrations (CMC), which are 1.8×10-4 mol/L and 3.9×10-4 mol/L respectively, are much lower than that of conventional surfactant cetyltrimethyl ammonium chloride (CTAC). In addition, compared with some gemini surfactants containing phenylene, xylylene and stilbenyl as spacer, this new kind of surfactants has good solubility in water at room temperature because of containing more hydrophilic groups or atoms in molecules.展开更多
用表面张力法研究了阳离子gemini表面活性剂乙基-1,2-双(十二烷基二甲基溴化铵)(简写为12-2-12)和非离子表面活性剂十二烷基聚氧乙烯醚(C_(12)E_n,其中n=4,10,23)混合体系在气液界面上的吸附行为;用扩张流变技术研究了吸附膜的扩张粘弹...用表面张力法研究了阳离子gemini表面活性剂乙基-1,2-双(十二烷基二甲基溴化铵)(简写为12-2-12)和非离子表面活性剂十二烷基聚氧乙烯醚(C_(12)E_n,其中n=4,10,23)混合体系在气液界面上的吸附行为;用扩张流变技术研究了吸附膜的扩张粘弹行为,实验数据用Lucassen-van den Tempel(LVT)模型进行拟合并根据模型得到了极限弹性值.最后研究了混合体系的泡沫行为,用泡沫塌陷到初始高度一半所对应的时间(t_(1/2))来表征泡沫的稳定性.结果表明,所有的非离子表面活性剂C_(12)E_n均与12-2-12产生了吸引作用.在12-2-12浓度相同的情况下,混合吸附层中吸附分子的最小分子占据面积的顺序为12-2-12/C_(12)E_(23)>12-2-12/C_(12)E_(10)>12-2-12/C_(12)E_4,而极限弹性的顺序为ε_(0,fit)(12-2-12/C_(12)E_4)>ε_(0,fit)(12-2-12/C_(12)E_(10))>ε_(0,fit)(12-2-12/C_(12)E_(23)).与单组分12-2-12形成的吸附膜相比,只有12-2-12/C_(12)E_4形成更加紧密的结构.具有较小亲水头基的非离子表面活性剂C_(12)E_4的加入可增强12-2-12吸附膜的弹性,进而增强了对应体系泡沫的稳定性.展开更多
基金We are grateful for the financial support from the National Natural Science Foundation of China(29971001,20031010)the Naturai Science Foundation of Anhui Province(0045115)the Science Foundation for Excellent Young Teachers of Universities of Anhui Province(01080309).
文摘The synthesis and surfactant activities of two new cationic gemini surfactants containing triazole compound as spacer were described. Their critical micelle concentrations (CMC), which are 1.8×10-4 mol/L and 3.9×10-4 mol/L respectively, are much lower than that of conventional surfactant cetyltrimethyl ammonium chloride (CTAC). In addition, compared with some gemini surfactants containing phenylene, xylylene and stilbenyl as spacer, this new kind of surfactants has good solubility in water at room temperature because of containing more hydrophilic groups or atoms in molecules.
基金supported by the National Natural Science Foundation of China(21473032,21273040)~~
文摘用表面张力法研究了阳离子gemini表面活性剂乙基-1,2-双(十二烷基二甲基溴化铵)(简写为12-2-12)和非离子表面活性剂十二烷基聚氧乙烯醚(C_(12)E_n,其中n=4,10,23)混合体系在气液界面上的吸附行为;用扩张流变技术研究了吸附膜的扩张粘弹行为,实验数据用Lucassen-van den Tempel(LVT)模型进行拟合并根据模型得到了极限弹性值.最后研究了混合体系的泡沫行为,用泡沫塌陷到初始高度一半所对应的时间(t_(1/2))来表征泡沫的稳定性.结果表明,所有的非离子表面活性剂C_(12)E_n均与12-2-12产生了吸引作用.在12-2-12浓度相同的情况下,混合吸附层中吸附分子的最小分子占据面积的顺序为12-2-12/C_(12)E_(23)>12-2-12/C_(12)E_(10)>12-2-12/C_(12)E_4,而极限弹性的顺序为ε_(0,fit)(12-2-12/C_(12)E_4)>ε_(0,fit)(12-2-12/C_(12)E_(10))>ε_(0,fit)(12-2-12/C_(12)E_(23)).与单组分12-2-12形成的吸附膜相比,只有12-2-12/C_(12)E_4形成更加紧密的结构.具有较小亲水头基的非离子表面活性剂C_(12)E_4的加入可增强12-2-12吸附膜的弹性,进而增强了对应体系泡沫的稳定性.
