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Wet-STEM tomography: principles, potentialities and limitations.

Karine Masenelli-Varlot1, Annie Malchère1, José Ferreira1

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Summary
This summary is machine-generated.

Environmental scanning electron microscopy (ESEM) enables 3D imaging of hydrated materials. This study presents a new device for ESEM tomography, demonstrating its feasibility for wet samples like mesoporous silica.

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Area of Science:

  • Materials Science
  • Microscopy
  • Nanotechnology

Background:

  • Determining the 3D structure of biological and inorganic materials in native-like states is a significant technological challenge.
  • Environmental scanning electron microscopy (ESEM) allows for the observation of hydrated samples in aqueous environments.

Purpose of the Study:

  • To present a specialized device for environmental scanning electron microscopy (ESEM) in scanning transmission electron microscopy (STEM) mode.
  • To enable the acquisition of tilt-series for tomographic reconstructions of hydrated samples.
  • To assess the feasibility and resolution of 3D imaging for wet materials using ESEM tomography.

Main Methods:

  • Development of a specific device for ESEM in STEM mode.
  • Acquisition of tilt-series data from hydrated samples.
  • Tomographic reconstruction of 3D structures.
  • Monte Carlo simulations to determine minimum detectable water thickness.

Main Results:

  • The device allows for the acquisition of tilt-series suitable for tomographic reconstruction.
  • Demonstrated the feasibility of performing tomography on wet materials, using hydrophilic mesoporous silica (MCM-41) as an example.
  • Calculated the minimum detectable water thickness and compared it with the expected resolution.

Conclusions:

  • The developed ESEM tomography device facilitates 3D structural characterization of hydrated materials under near-native conditions.
  • This technique opens new avenues for studying wet biological and inorganic samples with high resolution.
  • The findings provide insights into the capabilities and limitations of ESEM tomography for analyzing hydrated nanomaterials.