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Morphology


Transmission Electron Microscopy (TEM), High Resolution Transmission Electron Microscopy (HRTEM), Electron Tomography (ET)

Objects of study

Dispersed powder materials.

Applications

The following parameters are defined:

  • Morphology and sizes of the particles.
  • Real structure by the methods of diffraction and phase contrasts.
  • Atomic structure of the crystals with using of high resolution microscopy and computer simulation of the images.
  • The structure of the particles in size to 100 nm by micro diffraction method, in size to 1 nm – by nanobeam diffraction.
  • Elemental composition by energodispersion X-ray analysis (EDXA), locality is about 5 nm.
  • Phase transformations in situ studies (heating up to 900°C and cooling to –170°C) in real time.
  • Nanoparticles texture in 3 dimensions by Electron Tomography with resolution 1–2 nm.

Instrument facilities

Jeol JEM-100CX and JEM-2010 electron microscopes (Japan) are designated for recording of transmission electron images with the magnification up to 1500 000 times. Accelerating voltage is 100 kV for JEM-100CX and 200 kV for JEM-2010. The lattice resolution is 0.2 nm at JEM-100CX, 0.14 nm at JEM-2010.

There are goniometers available for sample inclination up to 45° around the axes x and y and tomographic holder for the samples inclination up to 72° around the axe x. It used detachable device for the sample heating (up to 900°C) and cooling (to –170°C).

Electron microscopes are equipped with video-recording electron system, JEM-2010 is equipped by X-ray microanalyzer EDAX (EDAX Co) with semi-conductor detector, energy resolution is not worse than 130 eV. The elements from B to U are determined.

Samples requirements

Dispersed sample in a quantity of several milligrams.

An example of reconstruction of the shape of metallic particle and carbon filament that formed on the particle in oxidation of hydrocarbons. The method of electron tomography (in High Angle Centered Dark Field regime).

The model of the surface of metal particle (reconstruction) The model of the surface of metal particle (reconstruction)
The model of carbon filament with metal particle (reconstruction) The model of carbon filament with metal particle (reconstruction)

Leading scientists and their research interests

Dr. V.I. Zaikovskii. Catalysts and adsorbents.


Scanning Electron Microscopy (SEM)

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Scanning Probe Microscopy (SPM)

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