羟基磺基甜菜碱氟碳表面活性剂在油水界面的扩张粘弹性

Dilational Rheological Properties of an Amphoteric Fluorocarbon Surfactant at the Oil / Water Interface

氟碳表面活性剂是目前表面活性最高的特种表面活性剂,在三次采油等领域具有良好的应用前景。用小幅周期振荡法研究了羟基磺基甜菜碱型氟碳表面活性剂(FS)在油-水界面的扩张粘弹性能,考察了振荡频率、FS质量分数、无机盐(Na Cl、Ca Cl2、Mg Cl2)对FS在油-水界面的扩张粘弹性能的影响。结果表明,FS溶液在油水界面的扩张模量、扩张弹性和扩张粘度随着FS质量分数的增加而出现最大值,随着频率的增大而略有增加。加入无机盐时,扩张模量、扩张弹性随Na Cl质量分数增大而出现最大值,而随着Ca Cl2或者Mg Cl2质量分数的增加,FS溶液的扩张模量、扩张弹性和扩张粘度减小,而当Ca Cl2或者Mg Cl2质量分数分别为0.05%、0.1%时,tanθ达到最大值。

Fluorocarbon surfactant as the highest surface active surfactant shows a good potential in enhanced oil recovery area. The dilational rheological properties of perfluorooctane sulfonamide dimethyl ammonium ethanol sulfonate（FS） at the oil/water interface were investigated using the oscillating barriers method at low frequency（0. 033 -0. 1 Hz）. Many factors, such as the oscillating frequency, bulk concentration and salts, greatly affect the dilational rheological properties. The increase and the dilational viscosity slightly increase results reveal that the dilational modulus and elasticity as the dilational frequency increases. The dilational modulus passes through a maximum value with the FS concentration increasing. Additionally, adding a moderate concentration of NaCl can increase the FS dilational modulus, while adding CaCl2 or MgCl2 yields opposite results, and the concentration of CaCl2 or MgCl2 reaches to 0. 05% and 0. 1%, respectively, tanθ is less than 45°.