INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
Spatial Resolution in Micrometric Periodic Assemblies of Magnetotactic Bacteria and Magnetic Nanoparticles
MORENO, ALEJANDRO; GONZÁLEZ, E; GODOY, MANUEL S.; PETTINARI M. JULIA; ANTONEL, P.S.; JORGE, GUILLERMO A; BEKERIS, VICTORIA
IEEE TRANSACTIONS ON MAGNETICS
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Lugar: New York; Año: 2013 vol. 49 p. 4572 - 4572
We developed a simple method for obtaining micro arrays of magnetic nanoparticles using audio tapes. We present spatial micro-arrangements of magnetotactic bacteria (Magnetospirillum gryphiswaldense), magnetite (Fe O ) and functionalized cobalt ferrite (CoFe O ) nanoparticles. Computer generated square audio waves of different frequencies (100 Hz?10 kHz) were recorded leading to magnetic patterns of different micrometer spatial wavelengths. Drops of aqueous suspensions were deposited on the tapes to control particle density, and bacteria and particles were trapped at locations where magnetic energy is minimized, as observed using conventional optical microscopy after the dispersium medium was evaporated. We discuss the spatial limits of the magnetic nanoparticles and the bacteria assemblies, concluding that cell walls of bacteria inhibit agglomeration and optimize spatial organization.