68. Antiphase Boundaries in Truncated Octahedron-shaped Zn-doped Magnetite Nanocrystals

Nerio Fontaiña-Troitiño, Miguel A. Ramos-Docampo, Martín Testa-Anta, Benito Rodríguez-González, Manuel Bañobre-López, Laura Bocher, Keith P. McKenna, Verónica Salgueiriño

J. Materials Chemistry C (2018) 6, 12800-12807 (DOI: 10.1039/C8TC05731A).

The presence of antiphase boundaries with local ferromagnetic coupling is herein related to the magnetic performance of truncated octahedron-shaped zinc-doped magnetite nanocrystals. Atomic resolution STEM imaging reveals the presence of these antiphase boundaries perpendicular to the [111] direction of the spinel structure of the nanocrystals. Magnetic characterization and DFT calculations indicate a local ferromagnetic order, originating from Fe-Fe enrichment at these individual lattice defects in the nanocrystals, as the underlying cause of the magnetic response measured.

 33 2018 JMaterChemC

67. Shaping Iron Oxide Nanocrystals for Magnetic Separation Applications

Martín Testa-Anta, Sara Liébana-Viñas, Beatriz Rivas-Murias, Benito Rodríguez-González, Michael Farle, Verónica Salgueiriño

Nanoscale (2018), 10, 20462-20467 (DOI: 10.1039/C8NR05864D).
Iron oxide nanostructures are attractive for a variety of bio-related applications given their wide range of magnetic properties. Here, we report on the study of the magnetophoretic mobility of octapod-shaped nanocrystals, which we relate to stoichiometry, quality and elongation in the <111> direction of these cubic structures. This special morphology combines magnetocrystalline anisotropies, increases shape anisotropy and hinders the formation of an epitaxial wüstite-magnetite interface. As a result, one obtains nanocrystals with large magnetic susceptibility and small coercivity, that is, with optimum characteristics for magnetic guidance, separation, and drug delivery, due to the increased magnetophoretic mobility displayed.

 32 2018 Nanoscale

66. Self-Assembly of Spherical or Rod-shaped Magnetic Nanocrystals onto Curved Substrates governed by the Radius of Curvature

Martín Testa-Anta, Miguel A. Correa-Duarte, Verónica Salgueiriño

Particle & Particle Systems Characterization (2018), 1800046 (DOI: 10.1002/ppsc.201800046).

 31 2018 Particle copia

65. Solvothermal Clustering of Magnetic Spinel Ferrite Nanocrystals: A Raman Perspective

Ruth Otero-Lorenzo, Miguel A. Ramos-Docampo, Benito Rodríguez-González, Miguel Comesaña-Hermo, Verónica Salgueiriño

Chemistry of Materials (2017), 29, 8729-8736 (DOI: 10.1021/acs.chemmater.7b02881).

 30 2017 ChemMater

64. Thermodynamically driven Oxidation-induced Kirkendall Effect in Octahedron-shaped Cobalt Oxide Nanocrystals

Miguel A. Ramos-Docampo, Beatriz Rivas-Murias, Benito Rodríguez-González, Verónica Salgueiriño

CrystEngComm (2017), 19, 5542-5548 (DOI: 10.1039/c7ce01285c).

 29 CrystEngComm copy