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Article
TSDC spectroscopy of relaxational and interfacial phenomena
Advances in Colloid and Interface Science (2007)
  • Vlad M Gun'ko, Institute of Surface Chemistry
Abstract
Applications of thermally stimulated depolarisation current (TSDC) technique to a variety of systems with different dispersion phases such as disperse and porous metal oxides, polymers, liquid crystals, amorphous and crystalline solids, composites, solid solutions, biomacromolecules, cells, tissues, etc. in gaseous or liquid dispersion media are analysed. The effects of dipolar, direct current (dc) and space charge relaxations are linked to the temperature dependent mobility of molecules, their fragments, protons, anions, and electrons and depend on thermal treatment, temperature and field intensity of polarisation, heating rate on depolarisation or cooling rate on polarisation. Features of the relaxation mechanisms are affected not only by the mentioned factors but also by morphological, structural and chemical characteristics of materials. The interfacial phenomena, especially the role of interfacial water, received significant attention on analysis of the TSDC data. Comparison of the data of TSDC and dielectric relaxation spectroscopy (DRS), differential scanning calorimetry (DSC), 1H NMR spectroscopy with layer-by-layer freezing-out of bulk and interfacial water, adsorption/desorption of nitrogen, water and dissolved organics demonstrates high sensitivity and information content of the TSDC technique, allowing a deeper understanding of interfacial phenomena.
Keywords
  • TSDC; Interfacial water; Fumed silica; Fumed mixed oxides; Silica gel; Amorphous solids; Glasses; Crystalline solids; Liquid crystals; Polymers;
Publication Date
Winter 2007
Citation Information
Vlad M Gun'ko. "TSDC spectroscopy of relaxational and interfacial phenomena" Advances in Colloid and Interface Science Vol. 131 Iss. 1-2 (2007)
Available at: http://works.bepress.com/vlad_gunko/1/