Off-axis electron holography of bacterial cells and magnetic nanoparticles in liquid

Prozorov, Tanya; Almeida, Trevor P.; Kovacs, Andras; Dunin-Borkowski, Rafal E.

doi:10.1098/rsif.2017.0464

Title: Off-axis electron holography of bacterial cells and magnetic nanoparticles in liquid

Journal Article · Mon Oct 02 00:00:00 EDT 2017 · Journal of the Royal Society Interface

DOI:https://doi.org/10.1098/rsif.2017.0464· OSTI ID:1406562

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Ames Lab., Ames, IA (United States)
Imperial College London, London (United Kingdom)
Forschungszentrum Julich, Julich (Germany)

Here, the mapping of electrostatic potentials and magnetic fields in liquids using electron holography has been considered to be unrealistic. Here, we show that hydrated cells of Magnetospirillum magneticum strain AMB-1 and assemblies of magnetic nanoparticles can be studied using off-axis electron holography in a fluid cell specimen holder within the transmission electron microscope. Considering that the holographic object and reference wave both pass through liquid, the recorded electron holograms show sufficient interference fringe contrast to permit reconstruction of the phase shift of the electron wave and mapping of the magnetic induction from bacterial magnetite nanocrystals. We assess the challenges of performing in situ magnetization reversal experiments using a fluid cell specimen holder, discuss approaches for improving spatial resolution and specimen stability, and outline future perspectives for studying scientific phenomena, ranging from interparticle interactions in liquids and electrical double layers at solid–liquid interfaces to biomineralization and the mapping of electrostatic potentials associated with protein aggregation and folding.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358; (FP7/2007-2013); 320832

OSTI ID:: 1406562

Report Number(s):: IS-J-9452; TRN: US1703042

Journal Information:: Journal of the Royal Society Interface, Vol. 14, Issue 135; ISSN 1742-5689

Publisher:: The Royal SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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