表面活性剂作用后的固体润湿性

通过考察经石油磺酸盐(PS)浸泡后的载玻片与油、水的接触角以及经石油磺酸盐浸泡后的云母片的表面形貌,研究表面活性剂作用后的固体润湿性。结果表明:对于亲水固体,经低质量浓度的石油磺酸盐作用后,其上因石油磺酸盐单分子层吸附而发生润湿性反转,而经高质量浓度的石油磺酸盐作用后,其上因石油磺酸盐双分子层吸附而保持水湿性,同时其润湿性达到稳定的时间随石油磺酸盐温度的升高而缩短;对于亲油固体,经低温高质量浓度的石油磺酸盐作用后,其润湿性难以改善,而经高温低质量浓度的石油磺酸盐作用后,其润湿性易因油湿性物质脱附而反转,但若此后该溶液继续作用,石油磺酸盐则会在新固体表面发生单层吸附,令其再次亲油;要高效利用表面活性剂改善润湿性,需要综合考虑表面活性剂浓度、温度以及作用时间的影响。

Solid wettability after surfactant acting

By measuring the contact angle of oil/water/glass slide that has been soaked in petroleum sulfonate(PS),as well as examining the surface topography of mica which also has been soaked by petroleum sulfonate,the solid wettability after surfactant acting was researched.The results show that,for hydrophilic solid,after being soaked in low concentration PS solution,its wettability alternates due to the adsorption of PS monomolecule layer on its surface.However,after being soaked in high concentration PS solution,its wettability keeps water-wet due to the adsorption of PS bilayer on its surface.Meanwhile,the time for hydrophilic solid reaching stable wettability shortens with elevated PS temperature.For hydrophobic solid,after being soaked in low temperature high concentration PS solution,its wettability rarely improves.However,after being soaked in high temperature low concentration PS solution,its wettability improves easily due to the desorption of oil-wet materials from its surface.But if the solid is soaked any more,its wettability will alternate again due to the adsorption of PS monomolecule layer on the new solid surface.Consequently,it demands comprehensive consideration about the surfactant concentration,temperature and action time to effectively use surfactant improving wettability.