Fabrication of novel anisotropic magnetic microparticles

Dyab, Amro K. F.; Dyab, Amro K.F.; Ozmen, Mustafa; Ersoz, Mustafa; Paunov, Vesselin N.

Abstract

We report a novel technique for fabrication of magnetically anisotropic microparticles based on “arresting” of the alignment of oleic acid coated magnetite nanoparticles (OCMNs) dispersed within the oil drops of a polymerisable oil-in-water emulsion. This was achieved by polymerising the oil drops after gelling the continuous aqueous phase in the presence of an external magnetic field. This approach allowed us to produce magnetic Janus particles with anisotropic optical and magnetic properties which form unusual zig-zag chains and structures when exposed to an external magnetic field. We studied the magnetic properties of these novel microparticles and showed that they retained remanence magnetisation with high coercivity values indicative of ferromagnetic behaviour. This indicates that the composite polymeric Janus microparticles posses a net magnetic dipole and behave like micromagnets due to the “arrested” orientation of the OCMNs in their polymeric matrix. Utilizing the same technique, magnetic Janus microparticles have been prepared based on emulsions stabilised only by OCMNs without the use of surfactants, and the effect of pH of continuous aqueous phase on the morphology of these microparticles has been investigated.

Citation

Dyab, A. K. F., Ozmen, M., Ersoz, M., & Paunov, V. N. (2009). Fabrication of novel anisotropic magnetic microparticles. Journal of Materials Chemistry, 19(21), 3475-3481. https://doi.org/10.1039/b814971m

• Journal Article Type: Article
• Acceptance Date: Mar 13, 2009
• Online Publication Date: Apr 15, 2009
• Publication Date: Jun 7, 2009
• Deposit Date: Nov 13, 2014
• Journal: Journal Of Materials Chemistry
• Print ISSN: 0959-9428
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 19
• Issue: 21
• Pages: 3475-3481
• DOI: https://doi.org/10.1039/b814971m
• Keywords: anisotropic particles, Janus particles, magnetic anisotropy, polymer microparticles, self-assembly, directed assembly, supraparamagnetic particles, ferromagnetic particles,
• Public URL: https://hull-repository.worktribe.com/output/461083
• Contract Date: Nov 13, 2014