Page 38 - 201812

第 35 卷第 12 期 精 细 化 工 Vol.35, No.12
2018 年 12 月 FINE CHEMICALS Dec. 2018

功能材料
疏水改性核壳结构颗粒对 Pickering 乳液的稳定作用

*
姜秋艳，李自闯，李秋红 ，李爱香，丛日敏，司维蒙
（山东理工大学 材料科学与工程学院，山东 淄博 255049）

摘要：为了探究固体颗粒对乳液的稳定作用,采用双亲染料分子罗丹明 B 对核壳结构的 Fe 3 O 4 @SiO 2 纳米颗粒进
行疏水改性，并将改性后的纳米颗粒作为稳定剂制备 Pickering 乳液。通过 Zeta 电位、FTIR、XRD、SEM、接
触角测量、光学显微镜、电导率仪对 Fe 3 O 4 @SiO 2 纳米颗粒以及 Pickering 乳液的结构、形貌和性能进行表征与
分析，结果表明：制备的纳米颗粒粒径小，约为 150 nm，为单分散球形核壳结构；罗丹明 B 成功修饰到 Fe 3 O 4 @SiO 2
纳米颗粒表面，改性后颗粒接触角由 30°增加至 120°；随乳化剂颗粒质量浓度的增加，制备的乳液液滴的粒
径减小。另外，所得 Pickering 乳液具有良好的磁场响应性，可通过外加磁场实现对乳液稳定性的可逆调控，且
此过程可重复 3 次以上。
关键词：罗丹明 B；疏水改性；Pickering 乳液；磁场调控；功能材料
中图分类号：O647 文献标识码：A 文章编号：1003-5214 (2018) 12-2006-06

Hydrophobic Modification of Core-shell Nanoparticles and Its
Stabilizing Effect on Pickering Emulsions

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JIANG Qiu-yan, LI Zi-chuang, LI Qiu-hong , LI Ai-xiang, CONG Ri-min, SI Wei-meng
（School of Materials Science and Engineering, Shandong University of Technology, Zibo 255049, Shandong, China）

Abstract: In order to explore the stabilizing effect of solid particles on the emulsions, core-shell
Fe 3O 4@SiO 2 nanoparticles were hydrophobically modified by Rhodamine B and then the resulting
modified nanoparticles were used as stabilizer to prepare Pickering emulsions. The structure, morphology
and properties of modified Fe 3O 4@SiO 2 nanoparticles and Pickering emulsions were characterized and
investigated by Zeta potential, FTIR, XRD, SEM, contact angle measurement, optical microscope and
conductivity measurement. The results showed that mono-dispersed, spherical and core/shell structure
nanoparticles with particle diameter 150 nm were synthesized successfully. Rhodamine B was successfully
introduced onto the surface of Fe 3O 4@SiO 2 nanoparticles. After Fe 3O 4@SiO 2 nanoparticles was modified,
its contact angle increased from 30° to 120°. The particle size of the emulsion droplets decreased with the
increase of emulsifier mass concentration. Moreover, the resulting Pickering emulsion had good magnetic
field responses. An externally applied magnetic field could modulate the stability of emulsions, and the
process could be repeated at least three times.
Key words: Rhodamine B; hydrophobic modification; Pickering emulsions; magnetic modulation;
functional materials
Foundation item: National Natural Science Foundation of China (21706148)

Pickering 乳液是由固体粒子替代传统表面活性 乳液的稳定机理主要是固体颗粒吸附于油/水界面，
[1]
剂作稳定剂的新型乳液，由 Ramsden 和 Pickering [2] 形成固体颗粒单层/多层膜，提高乳液的稳定性 [3-4] 。
于 20 世纪初发现并提出，其具有成本低、环境友好 与传统乳化剂相比，固体颗粒乳化剂在流体界面上
[5]
且稳定性高等优势，近年来受到广泛关注。Pickering 的吸附几乎不可逆 。目前，Pickering 乳液的研究

收稿日期：2018-03-19; 定用日期：2018-06-25; DOI: 10.13550/j.jxhg.20180185
基金项目：国家自然科学基金（21706148）
作者简介：姜秋艳（1994—），女，硕士生。联系人：李秋红（1979—），女，电话：0533-2782232，E-mail：qhli@sdut.edu.cn。