Electro-mechanical properties of multilayer graphene-based polymeric composite obtained through a capillary rise method

A new sensor made of a vinyl-ester polymer composite filled with multilayer graphene nanoplatelets (MLG) is produced through an innovative capillary rise method for application in strain sensing and structural health monitoring. The new sensor is characterized by high stability of the piezoresistive response under quasi-static consecutive loading/unloading cycles and monotonic tests. This is due to the peculiarity of the fabrication process that ensures a smooth and clean surface of the sensor, without the presence of filler agglomerates acting as micro- or macro-sized defects in the composite

Electromagnetic and electromechanical applications of graphene-based materials

This volume contains the extended abstracts of the contributions presented at the workshop Nanoscale Excitations in Emergent Materials (NEEM 2015) held in Rome from 12 to 14 October 2015, an event organized and supported in the framework of the Bilateral Cooperation Agreement between Italy and India within the project of major relevance "Investigating local structure and magnetism of cobalt nano-structures", funded by the Italian Ministry of Foreign Affairs and the Department of Science and Technology in India

Electro-Mechanical Properties of Multilayer Graphene-Based Polymeric Composite Obtained through a Capillary Rise Method

A new sensor made of a vinyl-ester polymer composite filled with multilayer graphene nanoplatelets (MLG) is produced through an innovative capillary rise method for application in strain sensing and structural health monitoring. The new sensor is characterized by high stability of the piezoresistive response under quasi-static consecutive loading/unloading cycles and monotonic tests. This is due to the peculiarity of the fabrication process that ensures a smooth and clean surface of the sensor, without the presence of filler agglomerates acting as micro- or macro-sized defects in the composite

Tenebre bianche. Immaginari coloniali fin de si\ue8cle

Come Joseph Conrad lascia intravedere nel suo capolavoro, \ue8 proprio alla fine del XIX secolo che il Cuore di tenebra africano insinua le sue inquietanti rifrazioni sulla cultura imperiale delle nazioni europee. Il progetto che gli immaginari coloniali di Francia, Belgio, Inghilterra e Portogallo contribuiscono a stratificare nella cultura europea non \ue8 altro che il tentativo di legittimare l\u2019impero con l\u2019idea. I quattro saggi raccolti in queste Tenebre Bianche provano a decostruire i potenti dispositivi mitografici, concentrandosi sulle rappresentazioni letterarie e fotografiche, che le nazioni d\u2019Europa piegano alla propria causa imperiale. (quarta di copertina

Electrical and electromechanical properties of stretchable multilayer-graphene/PDMS composite foils.

Multilayer graphene (MLG)/polydimethylsiloxane (PDMS) composite foils are developed for possible application in wearable electronics as stretchable conductors or in strain sensing. The MLG/PDMS foils are prepared through infiltration of PDMS into porous freestanding MLG papers. The freestanding MLG papers are first produced through vacuum filtration of MLG-flake suspensions and are characterized by sheet resistance in the range from ~0.7 to ~1.1 Ω/□ and average thickness in the range from ~75 to ~110 μm. The electromechanical characteristic of the produced MLG/PDMS foils is assessed experimentally by measuring the dc electrical resistance of the produced specimen during tensile strength tests. It results that the breaking load of the new composite foils, occurring after an elongation of ~11 mm, which corresponds to a deformation of ~80%, is nearly doubled with respect to the one of neat PDMS. Moreover, for an elongation up to 2 mm the total dc resistance of the foil exhibits an increase lower than the 20% of its original value

Electromechanical characterization of flexible and highly conducting multilayer graphene/polydimethylsiloxane composite paper

Multilayer graphene (MLG)/polydimethylsiloxane (PDMS) composite has been prepared by infiltrating free-standing MLG paper, obtained through the vacuum filtration of MLG-suspension using a nanoporous filter, with PDMS prepolymer. Electrical properties of both free-standing MLG paper and MLG/PDMS composite paper were investigated by four-point probe measurements. The obtained results show that the annealed MLG paper is characterized by a sheet resistance of ~ 0,69 Ω/□ which does not increase significantly with polymer infiltration. Moreover the electromechanical behaviour of the composite paper has been investigated experimentally by measuring the DC electrical resistance of the produced specimen during a tensile strength test. It results that the breaking of composite paper occurs at ~ 80% strain, like for the neat polymer, but with a more than doubled applied load. Furthermore, it is noted that for strain smaller than ~ 10%, the electrical resistance of MLG/PDMS composite paper is nearly constant