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Probing the stability and magnetic properties of magnetosome chains in freeze-dried magnetotactic bacteria

Abstract: Magnetospirillum gryphiswaldense biosynthesize high-quality magnetite nanoparticles, called magnetosomes, and arrange them into a chain that behaves like a magnetic compass. Here we perform magnetometry and polarized small-angle neutron scattering (SANS) experiments on a powder of freeze-dried and immobilized M. gryphiswaldense. We confirm that the individual magnetosomes are single-domain nanoparticles and that an alignment of the particle moments along the magnetic field direction occurs exclusively by an internal, coherent rotation. Our magnetometry results of the bacteria powder indicate an absence of dipolar interactions between the particle chains and a dominant uniaxial magnetic anisotropy. Finally, we can verify by SANS that the chain structure within the immobilized, freeze-dried bacteria is preserved also after application of large magnetic fields up to 1 T.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Nanoscale Adv., 2020,2, 1115-1121

Editorial: Royal Society of Chemistry

 Año de publicación: 2020

Nº de páginas: 7

Tipo de publicación: Artículo de Revista

 DOI: 10.1039/c9na00434c

ISSN: 2516-0230

Proyecto español: MAT2017-83631-C3-R

Proyecto europeo: info:eu-repo/grantAgreement/EC/FP7/604448/EU/Nanometrology Standardization Methods for Magnetic Nanoparticles/NanoMag/

Url de la publicación: https://doi.org/10.1039/c9na00434c

Autores/as

MARCANO PRIETO, LOURDES

ORUE GOIKURIA, IÑAKI

DIEGO ALBA VENERO

HONECKER, DIRK

PHILIPP FLORIAN BENDER

MUELA BLÁZQUEZ, ALICIA

MARIA LUISA FERNANDEZ-GUBIEDA RUIZ