物理化学学报 >> 1999, Vol. 15 >> Issue (09): 789-793.doi: 10.3866/PKU.WHXB19990904

研究论文 上一篇    下一篇

石油磺酸盐水溶液及其油/水平衡体系

陈咏梅, 徐峰, 张睿, 王涵慧, 俞稼镛   

  1. 中国科学院感光化学研究所,北京 100101
  • 收稿日期:1998-11-16 修回日期:1999-01-30 发布日期:1999-09-15
  • 通讯作者: 陈咏梅

Solution of Petroleum Sulfonate Sulfonate and its Oil/Water Equilibrated System

Chen Yong-Mei, Xu Feng, Zhang Rui, Wang Han-Hui, Yu Jia-Yong   

  1. Institute of Photographic Chemistry,The Chinese Academy of Sciences,Beijing 100101
  • Received:1998-11-16 Revised:1999-01-30 Published:1999-09-15
  • Contact: Chen Yong-Mei

摘要:

应用ESR法研究了石油磺酸盐水溶液及其油 /水平衡体系中水溶液胶束的形成及其微观性质 .结果表明 ,石油磺酸盐 / 3%正丁醇 / 0 3%氯化钠 /十二烷平衡体系的有效临界胶束浓度 (c*)远高于石油磺酸盐在 3%正丁醇、0 3%氯化钠中的临界胶束浓度 (CMC) .讨论了产生此结果的原因.

关键词: 石油磺酸盐, 胶束微环境, ESR

Abstract:

Micelle and premicellar solution of petroleum sulfonate and its oil/water equilibrated system have been studied by ESR with nitroxide spin probe. The ESR parameters decrease at CMC(critical micelle concentration) and c *(efficient critical micelle concentration in water/oil system). Spectral overlapping due to probes in bulk solution and into micelle have been analyzed. The CMC of petroleum sulfonate (YM 3A) in 3%n-butanol, 0.30%NaCl solution was found to be 0.003%(mass fraction). However, upon equilibration with n-dodecane, the c *in the equilibrated aqueous phase was found to be 0.02%~0.05%. It is proposed that upon equilibration with oil, the higher molecular weight species partition preferentially in the oil phase whereas low molecular weight species remain preferentially in the brine phase. Thus, after equilibration with oil, the average weight of surfactant remaining in the aqueous phase is considerable less than the average equivalent weight of the original surfactant. These results give an explanation that c *for SPS upon equilibration with dodecane is higher than CMC. 

Key words: Petroleum sulfonate, Microscopic environmert of micelle, ESR