Properties of Magnetosome Suspension under the Influence of Magnetic Field

A. Józefczak a, M. Molčan b, Z. Rozynek c,d, T. Hornowski a, A. Skumiel a, M. Timko b, J. Tóthová e, P. Kopčanský b and B. Leszczyński a,f aInstitute of Acoustics, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland bInstitute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia cInstitute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland dDepartment of Physics, NTNU, Høgskoleringen 5, NO-7491 Trondheim, Norway eDepartment of Physics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia fNanoBioMedical Centre, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

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The magnetotactic bacteria synthesize chains of nanosized magnetic particles that function as a compass needle to navigate in the direction of the earth's magnetic field. Magnetosomes are bacterial magnetic nanoparticles containing iron mineral crystals of magnetite or greigite, enveloped by a natural biological membrane. The objective of the work is to study the influence of magnetic field on rheology and acoustic properties of magnetosome suspension. Experimental results show a clear effect of the external magnetic field on the acoustic parameters such as velocity and attenuation of ultrasonic wave, and the viscosity of the suspension, arising from the biogenic magnetic particles aggregation.

DOI: 10.12693/APhysPolA.127.629 PACS numbers: 75.50.Mm, 43.35.Bf