Structural and Magnetic Properties of Iron-Palladium and Iron-Nickel Nanoparticle Biocomposites
Abstract
Biocomposites containing magnetic nanoparticles have the potential to combine the unique, tunable properties of nanoparticles with the strong mechanical and environmentally sustainable properties of natural fibers like cellulose. Recently, a method to synthesize Fe-Pd nanoparticles in cellulose has been developed. This study presents a detailed investigation on how magnetic properties of Fe-Pd nanoparticles are affected by increasing the metal load at a fixed atomic composition. An analysis of their magnetic response in static and dynamic magnetic fields indicates a polydisperse ensemble of nanoparticles with up to four distributions of blocking temperatures. In addition to the Fe-Pd studies, novel Fe-Ni nanoparticle biocomposites are presented for the first time. A unique energetic event was observed during the nitrogen reduction in Fe-Ni composites with low Fe-content. During this event, the cellulose matrix is degraded, an ensemble of Ni-Fe magnetic nanoparticles is formed, and the materials appear to store hydride. For samples for which no energetic event occurs, limited nanoparticle growth and weak magnetic properties are observed. The introduction of Fe into the Ni matrix appears to cause increased magnetic disorder. Both systems have been developed and characterized with the goal of creating magnetically active nanoparticle biocomposites for potential applications in electromagnetic shielding.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 16, 2022
- Accession Number
- AD1171842
Entities
People
- Matthew J. Fox
Organizations
- United States Naval Academy