Cryogels: Morphological, structural and adsorption characterisation

Vladimir M. Gun'ko, Irina N. Savina, Sergey V. Mikhalovsky

Research output: Contribution to journalReview articlepeer-review

147 Citations (Scopus)

Abstract

Experimental results on polymer, protein, and composite cryogels and data treatment methods used for morphological, textural, structural, adsorption and diffusion characterisation of the materials are analysed and compared. Treatment of microscopic images with specific software gives quantitative structural information on both native cryogels and freeze-dried materials that is useful to analyse the drying effects on their structure. A combination of cryoporometry, relaxometry, thermoporometry, small angle X-ray scattering (SAXS), equilibrium and kinetic adsorption of low and high-molecular weight compounds, diffusion breakthrough of macromolecules within macroporous cryogel membranes, studying interactions of cells with cryogels provides a consistent and comprehensive picture of textural, structural and adsorption properties of a variety of cryogels. This analysis allows us to establish certain regularities in the cryogel properties related to narrow (diameter 0.4<d<2 nm), middle (2<d<50 nm) and broad (50<d<100 nm) nanopores, micropores (100 nm<d<100 μm) and macropores (d>100 μm) with boundary sizes within modified life science pore classification. Particular attention is paid to water bound in cryogels in native superhydrated or freeze-dried states. At least, five states of water-free unbound, weakly bound (changes in the Gibbs free energy-ΔG<0.5-0.8 kJ/mol) and strongly bound (-ΔG>0.8 kJ/mol), and weakly associated (chemical shift of the proton resonance δH=1-2 ppm) and strongly associated (δH= 3-6 ppm) waters can be distinguished in hydrated cryogels using 1H NMR, DSC, TSDC, TGand othermethods.Different software for image treatment or developed to analyse the data obtained with the adsorption, diffusion, SAXS, cryoporometry and thermoporometrymethods and based on regularisation algorithms is analysed and used for the quantitative morphological, structural and adsorption characterisation of individual and composite cryogels, including polymers filled with solid nano- or microparticles.

Original languageEnglish
Pages (from-to)1-46
Number of pages46
JournalAdvances in Colloid and Interface Science
Volume187-188
DOIs
Publication statusPublished - 2013

Keywords

  • Adsorption
  • Cryogel
  • Cryoporometry
  • Diffusion
  • Interfacial phenomena
  • Microscopic image treatment
  • Structural characteristics
  • Thermoporometry

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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