Key synthesis of magnetic Janus nanoparticles using a modified facile method--颗粒学报PARTICUOLOGY

Ali, N., Zhang, B., Zhang, H., Zaman, W., Li, W., & Zhang, Q. (2014). Key synthesis of magnetic Janus nanoparticles using a modified facile method. Particuology, 17, 59–65. https://doi.org/10.1016/j.partic.2014.02.001

Key synthesis of magnetic Janus nanoparticles using a modified facile method

Nisar Ali ^a, Baoliang Zhang ^a, Hepeng Zhang ^a, Wajed Zaman ^b, Wei Li ^a, Qiuyu Zhang ^a *

a Key Laboratory of Applied Physics and Chemistry in Space of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi’an 710072, China b School of Material Science & Engineering, Northwestern Polytechnical University, Xi’an 710072, China

10.1016/j.partic.2014.02.001

Volume 17, December 2014, Pages 59-65

Received 9 October 2013, Revised 22 January 2014, Accepted 10 February 2014, Available online 30 March 2014.

E-mail: qyzhang@nwpu.edu.cn

Highlights

• P(MMA-AA-DVB)/Fe₃O₄ magnetic Janus nanoparticles were synthesized using a solvothermal process.

• Fe₃O₄ grew preferentially on one side of the polymeric precursor nanoparticle surface.

• Particle size was controlled to be 200 nm by adjusting amount of cross-linker in polymerization.

• Janus nanoparticles were superparamagnetic with a saturation magnetization of less than 25 emu/g.

Abstract

Inorganic/organic poly(methylmethacrylate-acrylic acid-divinylbenzene) iron oxide Janus magnetic nanoparticles (P(MMA-AA-DVB)/Fe₃O₄) with strong magnetic domains and unique surface functionalities were prepared using a solvothermal process. The P(MMA-AA-DVB) nanoparticles were prepared via soap-free emulsion polymerization and used as a precursor for preparing Janus nanoparticles. The morphology and magnetic properties of the magnetic Janus nanoparticles formed were characterized using a laser particle size analyzer, transmission electron microscopy, Fourier transform infrared spectroscopy, vibrating sample magnetometry, and thermogravimetric analysis. The synthesized P(MMA-AA-DVB)/Fe₃O₄ magnetic Janus nanoparticles were characterized by a Janus structure and possessed a stable asymmetric morphology after being dually functionalized. The particle size, magnetic content, and magnetic domain of the P(MMA-AA-DVB)/Fe₃O₄ magnetic Janus nanoparticles were 200 nm, 40%, and 25 emu/g, respectively. The formation mechanism of the Janus nanoparticles was also investigated, and the results revealed that the reduction of Fe³⁺ ions and growth of Fe₃O₄ took place on the surface of the P(MMA-AA-DVB) polymeric precursor particles. The size of the Janus particles could be controlled by narrowing the size distribution of the P(MMA-AA-DVB) precursor nanoparticles.

Graphical abstract

Keywords

Janus; Magnetic nanoparticles; Solvothermal process; Composite; Emulsion polymerization

文章导读