高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (1): 140-144.doi: 10.7503/cjcu20190452

• 物理化学 • 上一篇    下一篇

己二酸二酯原位功能化SiO2稳定Pickering乳液的相反转研究

陈静1,陈进华2,尹德忠1,2,*(),张伟1   

  1. 1. 西北工业大学理学院, 西安 710072
    2. 西北工业大学长三角研究院, 苏州 215400
  • 收稿日期:2019-08-14 出版日期:2019-12-05 发布日期:2019-11-14
  • 通讯作者: 尹德忠 E-mail:dezh_yin@nwpu.edu.cn
  • 基金资助:
    国家重点研发计划项目批准号:(2016YFC0301302);陕西省基础研究基金资助批准号:(2017JM5080)

Phase Inversion of Pickering Emulsion Stabilized by Adipate-functionalized SiO2 Particles

CHEN Jing1,CHEN Jinhua2,YIN Dezhong1,2,*(),ZHANG Wei1   

  1. 1. School of Science, Northwestern Polytechnical University, Xi’an 710072, China;
    2. Yangtze Delta Research Institute, Northwestern Polytechnical University, Suzhou 215400, China
  • Received:2019-08-14 Online:2019-12-05 Published:2019-11-14
  • Contact: Dezhong YIN E-mail:dezh_yin@nwpu.edu.cn
  • Supported by:
    ? Supported by the National Key Research and Development Program of China No(2016YFC0301302);the Shaanxi Provincial Natural Science Foundation, China No(2017JM5080)

摘要:

研究了原位改性SiO2稳定的己二酸二酯-水体系的乳液相反转特性, 探究了不同己二酸二酯分子对SiO2的功能化改性能力. 研究发现, 己二酸二酯的烷基链长对乳化行为有重要影响, 长分子链二酯倾向于形成O/W乳液, 而短分子链二酯则倾向于形成W/O型乳液. 结果表明, 短分子链的己二酸二酯对SiO2粒子的原位功能化改性效果更好, 其原因在于短分子链的己二酸二酯空间位阻较小, 酯基与Si—OH形成氢键能力较强. 改性SiO2的红外光谱证明了SiO2表面不同己二酸二酯的数量变化. 碱性条件下乳液稳定特性再次证实了所提出的机理.

关键词: Pickering乳液, 相反转, 表面改性, 己二酸二烷基酯

Abstract:

Phase inversion of emulsion of dialkyl adipate-water mixture stabilized by adipate-functionalized SiO2 particles was described. Ability of different adipate to functionalize SiO2 particles for Pickering emulsion was investigated systematically. Chain length of alkyl in adipates was found to be crucial to the property of formed emulsion. Adipate with long alkyl chain was apt to form oil-in-water emulsion, while adipate with short alkyl chain was apt to form wate-in-oil emulsion. The reason of this difference was explored by analyzing the phase inversion. Adipate with short alkyl chain has strong hydrogen bonding ability with Si—OH on SiO2 particles. Fourier transform infrared(FTIR) spectra verified directly the difference of adipate archored on SiO2 particles. Properties of emulsion prepared under pH=9 reconfirmed the proposed mechanism.

Key words: Pickering emulsion, Phase inversion, Surface functionalization, Dialkyl adipate

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