Communication
How octopod Mn–Fe oxide nanoparticle tracers minimize relaxation time and enhance MPI resolution
25 nm Octopod Mn–Fe oxide nanoparticles reduce crystal anisotropy, leading to faster relaxation times, a narrower MPI point spread function (PSF), and consequently improved spatial resolution.
Paper
Proximity effects, exchange bias and magnetic relaxation in γ-Fe2O3 nanoparticles
Carbon-encapsulated γ-Fe2O3 nanoparticles (NPs) exhibit emerging magnetic proximity effects together with a robust exchange-bias.
Paper
Insights into the formation of free radicals using metal ferrite nanocatalysts (MFe2O4, M = Fe, Mn, Zn, Co) prepared by a highly reproducible microwave-assisted polyol method
A microwave-assisted polyol method yielded metal ferrite nanocatalysts with >95% reproducibility. EPR analysis revealed that Mn promotes ˙OOH formation, Zn suppresses ROS formation via passivation, and acetate buffer masks radical detection.
Solution synthesis of antiferromagnetic manganese nanoparticles
Highly electrophilic Mn(0) nanoparticles were synthesized via an organometallic approach. Their magnetic properties indicate antiferromagnetic behaviour, while solution NMR studies unveiled the dynamic nature of weakly coordinated surface ligands.
A magnetic hybrid sol–gel ionic network catalyst for direct alcohol esterification under solvent-free conditions
A cross-linked magnetic acidic poly(ionic liquid) network with a high ionic content as an efficient, water-tolerant, and recyclable catalyst for direct esterification.
About this collection
Guest edited by Professors Nguyễn T. K. Thanh (University College London, United Kingdom), Teresa Pellegrino (Italian Institute of Technology, Italy), Ali Abou-Hassan (Sorbonne University, France), Anna Cristina S. Samia (Case Western Reserve University, United States), Olivier Sandre (University of Bordeaux, France) and Lise-Marie Lacroix (Toulouse University, France).
Magnetic nanoparticles are a class of materials that exhibit unique superparamagnetic properties due to their nanoscale size and high surface-to-volume ratio. The synthesis of magnetic nanoparticles is central to their widespread use, with several methods developed over the years to produce them in a controlled, reproducible manner. One of the most well-known and widely adopted methods is the alkaline co-precipitation method developed by Prof. René Massart in the early 1980s. Originally conducted in water (though it can be adapted to a dispersed state in less polar media), it is a widely used, cost-effective technique for synthesizing magnetic nanoparticles, especially iron oxide (magnetite and maghemite), as well as other spinel-structured metal oxides (e.g., cobalt, manganese, and zinc ferrites). Known for its simplicity, up-scalability, and ability to relatively control particle size and magnetic properties, the Massart process is extensively employed for producing nanomaterials for in biomedical, environmental, and industrial applications due to its efficiency and versatility in producing large quantities of tailored nanoparticles.
This themed collection aims to provide a comprehensive overview of the advances in the field of magnetic nanoparticle research, by covering its different facets ranging from rational design of synthesis processes to improved properties dispersion states, and end applications. In tribute to René Massart, this collection will cover various aspects of magnetic nanoparticles.