广西师范大学学报（自然科学版） ›› 2018, Vol. 36 ›› Issue (2): 69-77.doi: 10.16088/j.issn.1001-6600.2018.02.010

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基于多季铵盐改性纳米SiO2的Pickering乳液的制备及其性能研究

魏晓倩1,刘华荣1*,赖璐1,2   

  1. 1.长江大学化学与环境工程学院,湖北荆州 434023;
    2.非常规油气湖北省协同创新中心,湖北武汉 430100
  • 收稿日期:2017-08-25 出版日期:2018-05-10 发布日期:2018-07-18
  • 通讯作者: 刘华荣(1980—),女,湖北荆州人,长江大学副教授。E-mail:huarongliu2003@126.com
  • 基金资助:
    国家自然科学基金青年基金(201403017)

Synthesis and Properties of Pickering Emulsions Stabilized by Modified Nano-silica with Multiple Quaternary Ammoniums

WEI Xiaoqian1, LIU Huarong1*, LAI Lu1,2   

  1. 1. College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou Hubei 434023,China;
    2. Hubei Cooperative Innovation Center of Unconventional Oil and Gas,Wuhan Hubei 430100,China
  • Received:2017-08-25 Online:2018-05-10 Published:2018-07-18

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摘要： 采用多季铵盐(MQAS)对亲水型纳米SiO2进行表面改性,并以改性后的纳米SiO2为乳化剂,制备Pickering乳液,探讨乳化剂浓度、温度、pH、盐的加入对上述Pickering乳液稳定性的影响。结果表明,与MQAS和亲水型纳米SiO2单独乳化相比,MQAS改性后的纳米SiO2的乳化性能更为优异。随着MQAS浓度的增加,乳液的出水率降低。随着pH的降低,乳液的出水率逐渐增加,液滴粒径逐渐增大,这说明当pH较低时,多季铵盐与纳米SiO2之间的静电相互作用受到影响,从而导致乳液的稳定性下降。随着NaCl浓度的增加,乳液出水率和液滴粒径均逐渐增大,这说明盐的加入屏蔽了多季铵盐离子头基的电荷,从而导致乳液稳定性降低。

关键词: 纳米SiO2, 多季铵盐, Pickering乳液, 乳化性能

Abstract: The nano-silica particles were modified with multiple quaternary ammoniums (MQAS).The Pickering emulsions were prepared using the modified nano-silica particles as emulsifier and the effects of emulsifier concentration, temperature, pH value, and the addition of salts on the stability of Pickering emulsions were studied. The results showed that the emulsification properties become much better than those using the emulsifier of MQAS or nano-silica alone. The ratio of exudative water decreases with the increase of concentration of MQAS. Upon decreasing the pH value, the ratio of exudative water and the droplet diameter of emulsions increase, which indicates that a low pH value influences the electrostatic interactions between multiple quaternary ammoniums and nano-silica particles and thus weakens the stability of emulsions. The ratio of exudative water and the diameter of emulsion droplets also increase with an increasing concentration of NaCl, which suggests that the stability of emulsions is weakened due to the shielding effect of NaCl on the head charges of multiple quaternary ammoniums.

Key words: nano-silica, multiple quaternary ammoniums, Pickering emulsions, emulsifying property

中图分类号: 

  • O648
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