【摘要】 使用法国I.T.Concept公司生产的Tracker全自动液滴界面张力仪,通过对悬挂气泡/液滴的面积采用正弦振荡方案,利用滴外形分析方法测定阴离子型表面活性剂(发泡剂)HY—3溶液的表面/界面扩张黏弹性质。利用气泡(液滴)扩张压缩法研究了动态表面张力和表面扩张黏弹模量的影响因素。结果表明,随表面活性剂浓度的升高,HY—3溶液的表面张力逐渐降低,但当表面活性剂浓度达到临界胶束浓度时,HY—3溶液的表面张力不再降低;温度升高,HY—3溶液的表面张力降低,有助于提高液膜的稳定性。随着表面活性剂浓度的升高,表面扩张黏弹模量逐渐增大,但当表面活性剂浓度达到临界胶束浓度时,HY—3溶液的表面扩张黏弹模量开始减小;随着扩张频率的增大,表面扩张黏弹模量增大,液膜的机械强度增大,其自修复能力强,导致泡沫体系抗形变能力增强,泡沫稳定性呈现上升的趋势。更多还原

【Abstract】 Through the sinusoidal oscillation program of pendant bubble/drop area,Tracker automatic droplet interfacial tension instrument made by the French I.T.CONCEPT was used to measure surface/interfacial dilational rheological viscoelasticity of anionic surfactant (foaming agent) HY—3 solution with the method of drop shape analysis.Influence factors of dynamic surface tension and surface dilational viscoelasticity modulus were investigated with the method of bubble (drop) expansion and compression.The results demonstrate that,the surface tension of HY—3 solution decreased with the concentration of HY—3 increased until the concentration reached critical micelle concentration (CMC);surface tension of HY—3 solution reduced along with the temperature increases,which is beneficial to improve stability of liquid film.On the contrary,the surface dilational viscoelasticity modulus increases gradually with the surfactant concentration increased.But when the surfactant concentration reaches up to the CMC,the surface dilational viscoelasticity modulus began to decrease.With the frequency of expansion increases,the surface dilational viscoelasticity modulus increases,the mechanical strength of liquid film intensifies,the capacity for self-repair strengthenes,which resultes in the deformation resistant of foam system is enhanced.Therefore,foam stability showes a upward trend.更多还原