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Cryo-electron Microscopy01:28

Cryo-electron Microscopy

Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...

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Cryogels: morphological, structural and adsorption characterisation.

Vladimir M Gun'ko1, Irina N Savina, Sergey V Mikhalovsky

  • 1Chuiko Institute of Surface Chemistry, 17 General Naumov Street, Kiev 03164, Ukraine. vlad_gunko@ukr.net

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|December 11, 2012
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Summary

This study analyzes cryogel properties using various characterization techniques. It establishes regularities in cryogel structure and water states, aiding material design for diverse applications.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Biotechnology

Background:

  • Cryogels are versatile materials with applications in various fields.
  • Understanding their structural and textural properties is crucial for optimizing their performance.
  • Characterization methods provide insights into cryogel behavior under different conditions.

Purpose of the Study:

  • To analyze and compare experimental results and data treatment methods for polymer, protein, and composite cryogels.
  • To establish regularities in cryogel properties related to pore size and water states.
  • To provide a comprehensive picture of textural, structural, and adsorption properties of cryogels.

Main Methods:

  • Microscopic image analysis with specialized software.
  • Cryoporometry, relaxometry, thermoporometry, and small-angle X-ray scattering (SAXS).
  • Adsorption (equilibrium and kinetic), diffusion breakthrough studies, and cell interaction studies.
  • (1)H NMR, DSC, TSDC, TG for water state analysis.

Main Results:

  • Quantitative structural information obtained from image treatment, useful for analyzing drying effects.
  • Consistent and comprehensive characterization of textural, structural, and adsorption properties.
  • Established regularities in cryogel properties linked to pore size classification (nanopores, micropores, macropores).
  • Distinguished at least five states of water in hydrated cryogels.

Conclusions:

  • Software-based analysis of experimental data enables quantitative characterization of cryogels.
  • Understanding pore structure and water states is key to tailoring cryogel properties.
  • The findings contribute to the rational design of cryogels for specific applications.