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Multi-wall carbon nanotube networks prepared from pure MWCNT and their oxidised forms effect of compressive strain on electric resistence
Olejník, R. ; Slobodian, P. ; Říha, Pavel ; Kimmer, D. ; Sáha, P.
Multi-wall carbon nanotube networks were prepared by filtration of CNT aqueous dispersions. CNT dispersions were prepared with the help of surfactant system (sodium dodecyl sulfate with amylalcohol) by ultrasonication. Three types of MWCNT tubes were used. The first were pure CNT delivered by supplier. The others were oxidized CNT oxidized (1. acid solution of KMnO4; 2. the mixture of acids H2SO4 + HNO3). It was found that oxidization significantly changes properties of prepared carbon nanotube networks. There were observed differences in porous structures networks analyzed by SEM microscopy. Moreover, the apparent density of prepared MWCNT networks also changes according to the used CNT. The network electrical resistance is also affected by process of MWCNT oxidation as well as by compressive strain. It was found that the network resistance is sensitive to compressive strain both in the course of strain growth and when loading/unloading cycles are imposed.
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Application of Nanofibres in Filtration Processes
Kimmer, D. ; Vincent, I. ; Petras, D. ; Fenyk, J. ; Zatloukal, M. ; Sambaer, W. ; Slobodian, P. ; Salmela, H. ; Lehtimaki, M. ; Ždímal, Vladimír
The metod making possible to achieve the requireed of the nanofibres is demonstrated on the influence of telative humidity and solvent type on the fibre- forming process taking place in an electrostatic field. the effect of homogenity of the nanofibre deposition on the collection substrate is assessed empoying images from scanning electron microscopy (SEM) and tests of filtering abilities oh the nanofibre layers. Also, some measurements obtained when nanofibres were used in filtation of air, liquids and dispersions of carbon nanotubes in a liquid are presented.
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