Core-Shell Magnetic Particles and Related Methods

Technology

The current technology describes the development of a silicon dioxide shell around a plurality of magnetic nanoparticles (such as magnetite). The silicon dioxide shell would contain various functional groups (such as functionalized alkyl silanes) which are covalently bonded to the shell, and allow the overall particle to attach to other substances. Depending on the type of attachment desired, different functional groups can be chosen. The technology also describes methods of producing these shells, by combining an aqueous solution of magnetite, a reactive silicate and the functionalized alkyl silanes.

Problem Addressed

The magnetic particles tend to lose their functionality over time, either due to loss of magnetization of the particles, or from being dissolved or oxidized by the aqueous solutions in which they are used. Methods currently exist to create a protective shell around a magnetic core, in order to increase the durability of these particles. However, such methods of fabrication are either cumbersome, or not applicable to a wide range of aqueous media. The current technology presents a variety of alternative methods to develop a protective shell around a magnetic core that overcomes these challenges.

Advantages

• Uses synthetic functional groups that are less susceptible to biological degradation.
• Protects a magnetic core from oxidation and dissolution.
• Can be fabricated without the cumbersome use of microemulsion.