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Related Concept Videos

Other Unique Bacteria01:18

Other Unique Bacteria

Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...
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Preparation of Samples for Electron Microscopy

To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Updated: May 20, 2026

Remote Magnetic Actuation of Micrometric Probes for in situ 3D Mapping of Bacterial Biofilm Physical Properties
14:42

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Published on: May 2, 2014

Superomniphobic magnetic microtextures with remote wetting control.

Anton Grigoryev1, Ihor Tokarev, Konstantin G Kornev

  • 1Department of Chemistry and Biomolecular Science, Clarkson University , 8 Clarkson Avenue, Potsdam, New York 13699, United States.

Journal of the American Chemical Society
|July 21, 2012
PubMed
Summary
This summary is machine-generated.

Scientists demonstrate remote control over surface wetting behavior using magnetic fields. A special microstructured surface can switch between repelling and attracting liquids on demand.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Controlling surface wetting properties is crucial for various applications.
  • Existing methods often lack remote control or broad applicability.
  • Microstructured surfaces offer tunable wetting but require robust control mechanisms.

Purpose of the Study:

  • To demonstrate universal remote control of wetting behavior.
  • To enable a switchable transition between superomniphobic and omniphilic states.
  • To utilize an external magnetic field for reconfiguring surface properties.

Main Methods:

  • Fabrication of a reconfigurable microtexture using Nickel (Ni) micronails.
  • Investigation of wetting behavior with various liquids (water, surfactant solutions, organic liquids).
  • Application of external magnetic fields to alter surface curvature and induce wetting transitions.

Main Results:

  • The Ni micronail surface exhibited superomniphobic behavior, repelling diverse liquids.
  • Application of a magnetic field pulse induced a transition to an omniphilic state.
  • The surface became wetted by all tested liquids after magnetic field application, demonstrating reversibility.

Conclusions:

  • A novel method for universal remote control of wetting is presented.
  • Magnetic field-actuated reconfigurable microtextures offer dynamic control over surface interactions.
  • This technology has potential applications in microfluidics, anti-fouling, and smart coatings.