Influence of humidity on the electrical charging properties of cork agglomerates |
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Institution: | 1. Departamento de Ciência dos Materiais, Secção de Materiais Electroactivos (CENIMAT), Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;2. Department of Physics, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany;3. Department of Physics, Technical University of Iasi, B-dul D. Mangeron 67, Iasi 700050, Romania;1. Technical University of Lodz, Lodz, Poland;2. Naval Research Laboratory, Washington, DC, USA |
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Abstract: | Cork is a natural cellular and electrically insulating material which may have the capacity to store electric charges on or in its cell walls. Since natural cork has many voids, it is difficult to obtain uniform samples with the required dimensions. Therefore, a more uniform material, namely commercial cork agglomerate, usually used for floor and wall coverings, is employed in the present study. Since we know from our previous work that the electrical properties of cork are drastically affected by absorbed and adsorbed water, samples were protected by means of different polymer coatings (applied by spin-coating or soaking). Corona charging and isothermal charging and discharging currents were used to study the electrical trapping and detrapping capabilities of the samples. A comparison of the results leads to the conclusion that the most promising method for storing electric charges in this cellular material consists of drying and coating or soaking with a hydrophobic, electrically insulating polymer such as polytetraflouroethylene (Teflon®). |
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