物理化学学报 >> 2002, Vol. 18 >> Issue (10): 920-923.doi: 10.3866/PKU.WHXB20021011

研究论文 上一篇    下一篇

辛基三甲基溴化铵与辛基硫酸钠混合水溶液的相行为

胡尚林;贾晓非;戴乐蓉   

  1. 北京大学化学与分子工程学院, 北京　100871
  • 收稿日期:2002-02-07 修回日期:2002-03-26 发布日期:2002-10-15
  • 通讯作者: 戴乐蓉 E-mail:dlr@chem.pku.edu.cn

Phase Behavior of Mixed Aqueous Solution of Octyltrimethylamonium Bromide and Sodium Octyl Sulfate

Hu Shang-Lin;Jia Xiao-Fei;Dai Le-Rong   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing　100871
  • Received:2002-02-07 Revised:2002-03-26 Published:2002-10-15
  • Contact: Dai Le-Rong E-mail:dlr@chem.pku.edu.cn

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摘要： 对辛基三甲基溴化铵(OTAB)与辛基硫酸钠(SOS)正、负离子混合表面活性剂水溶液的相行为进行了研究.在高浓度的溶液中,混合表面活性剂形成液晶相,随着混合摩尔比OTAB/SOS接近于1,液晶结构由六角相转层状相,同时夹杂少量沉淀物;在中等浓度时,任意混合摩尔比例下皆为均相透明溶液;在低浓度下,在很宽的OTAB/SOS混合摩尔比的范围,出现双水相,其中的表面活性剂稀薄相,为不同大小的胶团与囊泡组成的稀溶液,另一表面活性剂富集相中则为数密度很大的囊泡聚集体,富集相对油溶性染料的增溶作用比非富集相高得多.

关键词: 正负离子混合表面活性剂, 相行为, 液晶(LC), 双水相, 囊泡

Abstract: The phase behavior of aqueous mixture of octyltrimethylamonium bromide (OTAB) and sodium octyl sulfate (SOS)was studied. In concentrated solution, a liquid crystal phase formed and converted form hexangonal structure to lamellar when the molar ratio of OTAB/SOS approached to 1.The mixed surfactant solution is a homogeneous and transparent liquid in middle concentration range. When the concentration is low, aqueous two-phase system appears in a wide range of OTAB/SOS molar ratio. In the aqueous surfactant two phase system, both vesicles and micelles exist in the surfactant-poor phase, while concentrated vesicle aggregates were contained in the surfactant-rich phase. Solubilization amount of oil-soluble dye in the surfactant-rich phase is much higher than that in the surfactant-poor phase.

Key words: Mixed cationic-anionic surfactant, Phase behavior, Liquid crystal, 　Aqueous two phase, Vesicles