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(37) Production(s) de TAHIR S.
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Reinforcement of an epoxy resin by single walled nanotubes
Auteur(s): Vaccarini L, Desarmot G, Almairac Robert, Tahir S., Goze-Bac C., Bernier Patrick
Conference: 14th International Winter School on Electronic Properties on Novel Materials (KIRCHBERG (AUSTRIA), FR, 2000-03-04)
Actes de conférence: ELECTRONIC PROPERTIES OF NOVEL MATERIALS-MOLECULAR NANOSTRUCTURES, vol. 544 p.521-525 (2000)
Résumé: The anisotropic shape and the very high stiffness of carbon nanotubes make them good candidates for the reinforcement of various materials. For instance polymer-nanotubes blends could be used as a new material but also as a matrix for carbon fibre composites in order to improve their mechanical properties, in particular under compressive loading. Tn this study, we have prepared several SWNTs-epoxy blends containing various SWNTs weight percentages (from 0 to 35%). Blends are themselves composite materials, observed and characterized by SEM, TEM and X-ray diffraction. Two methods are used to evaluate their stiffness: Vickers microindentation and three points bending tests. We observe a linear increase of the Young's modulus with the weight percentage of SWNTs. For comparison SWNTs purifted by a cross flow filtration process have also been used. The obtained results are discussed.
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Investigation of the role of yttrium in the production of SWNT by arc discharge
Auteur(s): Gavillet J, Loiseau A, Stephan O, Tahir S., Bernier Patrick
Conference: 14th International Winter School on Electronic Properties on Novel Materials (KIRCHBERG (AUSTRIA), FR, 2000-03-04)
Actes de conférence: ELECTRONIC PROPERTIES OF NOVEL MATERIALS-MOLECULAR NANOSTRUCTURES, vol. 544 p.222-225 (2000)
Résumé: We present a TEM study of single wall nanotubes (SWNTs) produced with the electric are discharge technique using a Ni/Y catalyst (of various relative proportions). The study shows that SWNT ropes grow from metallic nanoparticles which are found to have definite Ni-Y compositions. This link has been confirmed for the different Ni/Y anode compositions investigated.
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