电导法研究胶质液泡稳定性

Investigation of stability of colloidal liquid aphrons by conductance measurement

应用电导法考察了溶剂极性和溶液离子强度对胶质液泡稳定性的影响,并提出了胶质液泡的稳定性模型。测量得到的电导率值kt随时间t的变化曲线出现a、b和c三个明显不同的区域。由增比电导率值kr随时间变化关系曲线的陡峭程度和a区所占时间,分析了溶剂种类和溶液离子强度对胶质液泡稳定性的影响。根据电导率值变化敏感的b区的动力学分析,结合胶质液泡液滴的上升、聚并和破乳等体系不稳定因素提出了胶质液泡稳定性模型。胶质液泡体系模型拟合值与稳定性实验测量数据的符合程度是令人满意的。

The effects of solvent properties and solution ionic strength on the stability of colloidal liquid aphrons （CLAs） were investigated experimentally by conductance measurement, and a stability model was proposed. The obtained electrical conductivity （k,） vs time curve showed three different regions （a, b and c）. According to the variation of slope of the incremental ratio of specific conductivity （kr） vs time curves and the time taken by region a, the effects of solvent properties and solution ionic strength on the stability of CLAs were analyzed. From the kinetic analysis of region b in which electrical conductivity changed drastically, the stability model of dispersed CLAs was proposed in view of destabilizing factors of CLAs systems, such as buoyant rise, flocculation, coalescence and demulsification of the dispersed CLAs. The agreement of model prediction with experimental data was satisfactory.