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Related Experiment Video

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Optimizing Sample Preparation for Cryogenic Electron Microscopy
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Nanofluidic and monolithic environmental cells for cryogenic microscopy.

S Gorelick1,2, T Alan3, A Z Sadek4

  • 1Department of Biochemistry and Molecular Biology, Faculty of Medicine, Nursing and Health Sciences, Monash University, 23 Innovation Walk, 3800 Clayton, Victoria, Australia.

Nanotechnology
|December 25, 2018
PubMed
Summary
This summary is machine-generated.

We developed a novel device integrating nanofluidics and cryogenic transmission electron microscopy (cryo-TEM) for near-native imaging of water-soluble samples. This technology enables high-resolution visualization of biological specimens without air-water interfaces.

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Area of Science:

  • Materials Science
  • Biophysics
  • Microscopy

Background:

  • Cryogenic transmission electron microscopy (cryo-TEM) requires samples to be rapidly frozen to form vitreous water, preserving near-native structures.
  • Conventional cryo-TEM sample preparation can be limited by air-water interfaces and crystalline ice formation, hindering high-resolution imaging.

Purpose of the Study:

  • To present a novel device combining nanofluidics and cryo-TEM for inspecting water-soluble samples under near-native conditions.
  • To demonstrate a fabrication method for robust, single-wafer devices compatible with standard cryo-TEM workflows.

Main Methods:

  • Fabrication of micro/nano-scale channels between electron-transparent silicon nitride windows on a single wafer.
  • Integration of thin membrane windows using a single-step through-membrane electron beam exposure.
  • Compatibility testing with standard TEM holders and rapid freezing techniques (plunge freezing).

Main Results:

  • Demonstrated devices with channel heights from 80-500 nm and widths from 100-2000 μm.
  • Fabrication process yields devices resistant to thermal stress, eliminating wafer alignment issues.
  • Successful preparation of vitreous water using plunge freezing of the chips, confirmed by imaging experiments.

Conclusions:

  • The developed nanofluidic-cryo-TEM device enables near-native imaging of water-soluble samples.
  • The fabrication method is scalable and produces robust devices compatible with standard cryo-TEM.
  • This technology offers a promising approach for high-resolution structural analysis of biomolecules.