Comparative analysis of heterogeneous solid and soft materials by adsorption, NMR and thermally stimulated depolarisation current methods |
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Authors: | VM Gun’ko VV Turov VI Zarko B Charmas |
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Institution: | a Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine b Department of Chemical Physics, Maria Curie-Sklodowska University, 20-031 Lublin, Poland |
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Abstract: | Structural characterisation of such bio-objects as fibrinogen solution, yeast cells, wheat seeds and bone tissues has been done using two versions of cryoporometry based on the integral Gibbs-Thomson (IGT) equation for freezing point depression of pore liquids and the measurements by 1H NMR spectroscopy (180-200 < T < 273 K) and the thermally stimulated depolarisation current (TSDC) method (90 < T < 273 K) of structured water. The IGT equation was solved using a self-consisting regularization procedure including the maximum entropy principle applied to the distribution function of pore size (PSD). Both methods give clear pictures of changes in the structural characteristics caused, e.g., by hydration and swelling of wheat seeds and yeast cells, coagulation and interaction of fibrinogen with solid nanoparticles in the aqueous media, and the human bone tissue disease. |
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Keywords: | 61 43 Gt powders Porous materials 68 08 &minus p liquid-solid interfaces 68 43 &minus h chemisorption/physisorption Adsorbates on surfaces |
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