Citation: Zhao Ruotong, Han Tianhao, Sun Dayin, Shan Dan, Liu Zhengping, Liang Fuxin. Multifunctional Fe₃O₄@SiO₂Janus Particles[J]. Acta Chimica Sinica, ;2020, 78(9): 945-954. doi: 10.6023/A20060208 shu

Multifunctional Fe₃O₄@SiO₂Janus Particles

Zhao Ruotong ^a,† ,
Han Tianhao ^c,† ,
Sun Dayin ^b ,
Shan Dan ^d ,
Liu Zhengping ^a,, ,
Liang Fuxin ^b,,

a.
College of Chemistry, Beijing Normal University, Beijing 100875;
b.
Institute of Polymer Science and Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084;
c.
Sinopec Research Institute of Petroleum Processing, China Petroleum and Chemical Corporation, Beijing 100083;
d.
Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100020

Corresponding author: Liu Zhengping, lzp@bnu.edu.cn Liang Fuxin, liangfuxin@tsinghua.edu.cn
Received Date: 4 June 2020
Available Online: 13 July 2020
Fund Project: the National Natural Science Foundation of China 51622308the National Natural Science Foundation of China 51673119Project supported by the National Natural Science Foundation of China (Nos. 51673119, 51622308)

Figures(11)

Fe₃O₄@SiO₂ particles were synthesized by a solvothermal method and a classical stber method. Superparamagnetic Fe₃O₄ was the core, and a sol-gel coating of SiO₂ was the shell. After the SiO₂ surface was modified with amino groups, benzaldehyde was conjugated to the particles by a Schiff base reaction. The Fe₃O₄@SiO₂ particles were emulsified in paraffin/water as a solid emulsifier to obtain an oil-in-water Pickering emulsion. After cooling the paraffin, the particles were fixed on the surface of the emulsion droplets. The particles were etched in ammonium fluoride aqueous solution, and Janus particles with different structures could be obtained by adjusting the etching time. Via the in situ growth of metal Pt or Ag nanoparticles, superparamagnetic Fe₃O₄@SiO₂-Pt or Fe₃O₄@SiO₂-Ag Janus particles were obtained. The movement of Fe₃O₄@SiO₂-Pt Janus particles was observed due to the catalytic decomposition of hydrogen peroxide aqueous solution. It was found that in the short term, there was a linear motion, while in the long term, the motion direction and trajectory were random. Fe₃O₄@SiO₂-Ag Janus particles were used as magnetic solid surfactants to stabilize the emulsions and catalyze the nitro reduction. About 60% of the surficial area of the Janus particles was modified by phenyl groups, while the remaining 40% was covered with Ag nanoparticles. Under the premise of maintaining the Janus balance, the whole particle became more hydrophobic, which was conducive to the formation of the water-in-oil emulsion. In addition, the Ag side of the Janus particles was towards the aqueous phase, and the opposite hydrophobic side was towards the oil phase. The Janus particles possessed a fixed orientation assembly at the oil-water interface. The assemble membrane possessed Janus characteristics, and it facilitated the stable dispersion of the emulsion and the catalysis. The method has the advantages of a simple principle, capability for mass production, universality and versatility. It is expected that Janus particles will be used to more precisely regulate the zoning with different functional substances.
- Janus particle,
- magnetic response,
- self-driven,
- solid emulsifier,
- catalysis
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Multifunctional Fe₃O₄@SiO₂Janus Particles