By Tofail Syed;Paul O'Brien;Harold Craighead;Harry Kroto;Halina Podbielska

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2). By continuously decreasing the temperature down to T0 (usually room temperature), the oriented dipoles will be frozen. At the temperature T0, the external electrostatic field is switched off. To remove a free space charge, the sample is short-circuited for time t0. After that, the sample is linearly heated and the depolarization current is recorded as a function of temperature with a highly sensitive electrometer. For polymers, current peaks are usually observed around the glass-transition temperature, at which polarization is completely removed and all trapped charges are released.

In dry conditions, the charge measurement methods are generally based on direct measurement of depolarization or the discharging current of the sample, or indirect measurement of charge induced on capacitive-coupled probe. RSC Nanoscience & Nanotechnology No. 21 Biological Interactions with Surface Charge in Biomaterials Edited by Syed A. M. org 26 Surface Charge Measurements on Biomaterials in Dry and Wet Conditions 27 The thermally stimulated depolarization current (TSDC) measurement technique has been used especially for electret biomaterials.

The TOC study was also performed with Ag-doped TiO2 amorphic nanopowders that were prepared by sol-gel route. The results showed that this powder acts as an effective photocatalyst in mineralization of phenol, and a decrease in the TOC value with irradiation time was observed. However, the presence of metallic silver in the anatase form of TiO2 leads to slight decrease Photocatalytic Effects in Doped and Undoped Titania 23 in the photocatalytic activity in comparison to the non-doped sample. This effect of Ag-doped titania on the photocatalytic activity can be related to the fact that the deposited silver is present on the surface in form of metallic particles with a size of approximately 33 nm.

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