Ultrasonic assisted rapid synthesis of high uniform super-paramagnetic microspheres with core-shell structure and robust magneto-chromatic ability

Wenyan Zhang, Jiahua Chen, Wei Wang, Gong Xuan Lu, Lingyun Hao, Yaru Ni, Chunhua Lu, Zhongzi Xu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Super-paramagnetic core-shell microspheres were synthesized by ultrasonic assisted routine under low ultrasonic irradiation powers. Compared with conventional routine, ultrasonic effect could not only improve the uniformity of the core-shell structure of Fe3O4@SiO2, but shorten the synthesis time in large scale. Owing to their hydrophilicity and high surface charge, the Fe3O4@SiO2 microspheres could be dispersed well in distilled water to form homogeneous colloidal suspension. The suspensions have favorable magneto-chromatic ability that they sensitively exhibit brilliant colorful ribbons by magnetic attraction. The colorful ribbons, which distributed along the magnetic lines, make morphology of the magnetic fields become “visible” to naked eyed. Those colorful ribbons originate from strong magnetic interaction between the microspheres and magnetic fields. Furthermore, the magneto-chromatic performance is reversible as the colorful ribbons vanished rapidly with the removing of magnetic fields. The silica layer effectively enhanced the acid resistance and surface-oxidation resistance of theFe3O4@SiO2 microspheres, so they could exhibit stable magnetic nature and robust magneto-chromatic property in acid environment.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalJournal of Magnetism and Magnetic Materials
Volume426
DOIs
StatePublished - 15 Mar 2017

Keywords

  • Composite
  • Magneto-chromatic
  • Optical
  • Super-paramagnetic
  • Ultra-rapid

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