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Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

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Published on: October 25, 2017

Heterostructured magnetic nanotubes.

Daeyeon Lee¹, Robert E Cohen, Michael F Rubner

¹Department of Chemical Engineering and Department of Materials Science and Engineering and the Center for Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|December 28, 2006

Summary

Magnetic nanotubes were created using layer-by-layer assembly for potential drug delivery. These superparamagnetic nanostructures show tunable release of molecules, enabling targeted delivery applications.

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Area of Science:

Materials Science
Nanotechnology
Biomedical Engineering

Background:

Layer-by-layer assembly is a versatile technique for creating complex nanostructures.
Functional nanomaterials are crucial for advanced applications in separation and drug delivery.
Superparamagnetic nanoparticles offer unique properties for targeted manipulation and release.

Purpose of the Study:

To synthesize heterostructured magnetic nanotubes using a template-assisted layer-by-layer assembly method.
To investigate the superparamagnetic properties and surface functionalization of the fabricated nanotubes.
To evaluate the potential of these magnetic nanotubes as vehicles for separation and targeted delivery of anionic molecules.

Main Methods:

Fabrication of multilayer nanotubes via layer-by-layer deposition of polyelectrolytes (poly(allylamine hydrochloride) and poly(styrene sulfonate)) and magnetite (Fe3O4) nanoparticles within polycarbonate membrane pores.
Characterization using Transmission Electron Microscopy (TEM) and SQUID magnetometry.
Assessment of separation and release kinetics of anionic molecules (ibuprofen, rose bengal, acid red 8) under varying conditions.

Main Results:

Successfully assembled submicrometer heterostructured magnetic tubes with an inner shell of magnetite nanoparticles.
Confirmed superparamagnetic behavior at room temperature.
Demonstrated selective separation of dye molecules (rose bengal) by activating nanotubes in acidic solution.
Observed differential release kinetics: rapid release of small molecules (ibuprofen) and slow release of bulky molecules (rose bengal) in buffer solution.

Conclusions:

The developed method provides a versatile route to create functional magnetic nanotubes with tunable properties.
These magnetic nanotubes show promise for applications in molecular separation and targeted delivery of therapeutics.
The controlled release behavior suggests potential for site-specific drug delivery systems.