TSD current spectra

The TSD current spectra of triboelectrets of polar as well as nonpolar polymers show three peaks (Table 4.3). PE peak II is attributed to relaxation of the residual polarization as a result of accumulation and orientation... 

Fig. 6 Charge TSD and TSD current spectra of parylene HT samples without annealing solid) and annealed at 400 °C for 1 h before charging dashed). The surface potentials are normalized to the initial values, and the TSD current is shown in an arbitrary unit (Lo and Tai 2008)...

FIgura 38 Effect of electrode material on TSD current spectra of PTUFA. (From Ret 2S.)... 

The principal characteristics of the triboelectret state in polymers recorded experimentally are i) the efficient surface charge density (ESCD) value and ii) the thermally stimulated depolarization (TSD) current spectrum, i.e. the discharge current dependence of the electret on its heating temperature. The analysis of TSD spectra helped to estimate the parameters of the triboelectret state, including the homo- to heterocharge relation in a dielectric, activation energy of the charge relaxation processes, relaxation time and others. 

FIGURE 7.57 (a) TSDC spectra of individual water and water located in rat tail vertebrae initially and after additional adsorption of water vapor for 24 h (+6 wt%) (discharging current has the opposite sign to that of the TSD current) and (b) pore size distribution calculated on the basis of the TSDC for initial bone tissue (sample I) for dipolar relaxation at 7 <225 K. (Adapted from Colloids Surf. B Biointerfaces, 48, Turov, V.V., Gun ko, V.M., Zarko, V.I. et al.. Weakly and strongly associated nonfreezable water bound in bones, 167-175, 2006a, Copyright 2006, with permission from Elsevier.)... 

When an electret is reheated at a linear rate, a discharge current te produced in the external circuit This ibermally stimulated discharge current is recorded as a function of temperature. The resulting TSD spectrum shows maxima which corresponds to various decay processes. In polymer electrets, these decay modes correspond to various polymeric relaxations. Therefore, analysis of TSD spectra of polymer electrets provides very useful information on various aspects of charge storage mechanisms and relaxation processes. 

Polarization Temperature (T [193] The polarizing temperature, has a significant influence on the position and magnitude of the peak current due to various processes in the TSD spectra. For a process with a single relaxation lime, the peak in the TSD spectrum remains urultered, while its magnitude increases with increasing In a dis-... 

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