The demand for high performance multifunctional wearable devices is more and pushing towards the development of novel low-cost, soft flexible sensors with sensitivity. In present work, we describe fabrication process properties new polydimethylsiloxane (PDMS) foams loaded multilayer graphene nanoplatelets (MLGs) application as sensitive piezoresistive pressure sensors. effective DC conductivity produced measured a function MLG loading. response MLG-PDMS foam-based sensor at different strain...

The development of lightweight microwave absorber, operating in a wide range frequencies, is still challenging task. A novel broadband radar absorbing material developed using phenolic aramid honeycomb (HC) coated with graphene-filled polymeric paint, which made colloidal suspension graphene nanoplatelets (GNPs) dispersed mixture polyvinyl-alcohol, water, and 1-propanol. This study describes the production process GNP-filled paint lossy HC, investigates morphological electromagnetic...

Innovative graphene-based sensors are produced through the spray deposition of multilayer graphene suspension in 1-propanol. They cost effective and suitable for large-scale integration aeronautical-grade composite structures. The piezoresistive characteristic new sensor has been assessed static, quasi-static, dynamic tests. obtained results show that detecting strains any directions due to isotropic material. Moreover, potentiality proposed situ non-destructive investigations...

In this work we investigate the piezoresistive effect in multilayer graphene (MLG) based films produced by two different cost-effective techniques, spray coating and drop casting. Both techniques enable direct deposition of sensor over structure to be monitored. The behavior MLG-based sensors has been investigated experimentally measuring variation electrical resistance during three point bending tests. response stabilized through an optimized mechanical treatment. obtained results show that...

In this work we investigate the shielding properties of graphene-based films, produced by spray casting deposition, which is a cost-effective technique that can be directly scaled to industrial applications. The deposition process optimized in order produce uniform films made well dispersed graphene nanoplatelets (GNP), having thicknesses range 3-8 microns. sheet resistance and effectiveness up 18 GHz using GNP-suspensions at different concentrations are measured compared with ones carbon...

Thin and flexible freestanding graphene nanoplatelets (GNPs)-based paper-like materials are fabricated experimentally characterized to assess their employment as radiofrequency electromagnetic interference shields. Samples obtained by vacuum filtration of ultrasonicated suspensions. Different suspensions prepared mixing either acetone/DMF or acetone/NMP worm-like exfoliated graphite expanded at the temperature 1150 °C 1250 for 5s. We investigated effect thermal annealing mechanical...

In this work we developed novel stretchable sensors constituted by a percolating network of graphene nanoplatelets (GNPs) which has been deposited via spray coating over polyester fabric and integrated in biocompatible elastomer. The electromechanical response the is firstly investigated through quasi-static tensile tests. measured resistance variation under applied stress confirms piezoresistive behavior fabricated sensors, having maximum gauge factor 90 at strain 25%. Moreover, GNP-based...

In this work, we develop graphene-gold electrodes (GGEs) for flexible nanogenerators made of porous piezoelectric PVDF films. The bilayer electrode structure was conceived in order to avoid the short circuit between top and bottom produced through direct Au sputtering over film surface. Gold sputtered chemical-vapor- deposition (CVD) grown graphene film, that subsequently transferred onto a film. We analysed morphology electrical properties GGEs with increasing thickness optimize surface...

In this work we analyze the feasibility of a broadband radar absorbing material made with an aeronautical grade honeycomb panel, coated thin conducting film multilayer graphene nanoplatelets (MLGs). The is deposited over surface phenolic-aramid sheet and characterized in terms resistance thickness. morphology flakes analyzed by atomic force scanning electron microscopies. deposition parameters are optimized order to control MLG film. microwave properties MLG-coated panel predicted through 3D...

Current key technologies to meet the future emission standards for internal combustion engines are downsizing, down-speeding, and advanced charging concepts. While turbocharging already combines high specific rated engine power with low fuel consumption, there is still potential optimization achieve prospective demands efficiency emissions. Using exhaust energy, turbine underlies pulsating flow conditions from towards zero mass at almost constant blade speed. The average then affected jet...

A novel lightweight wideband radar absorbing material (RAM) for radio-frequency is developed using a rohacell (RC) panel coated with film of carbon nanostructures. The coating produced through the dispersion either commercial graphene nanoplatelets (GNPs) or nanofibers (CNFs) in 1-propanol and deposition so-obtained colloidal suspension onto RC surface bristle brush. Finally, polymeric deposited over carbon-based lossy layer order to protect from external environment. electromagnetic...

In this work, we have developed novel flexible strain sensors based on an highly interconnected three-dimensional Polyurethane (PU) foam coated with a Polyvinyl alcohol (PVA)-multilayer graphene nanoplatelets (MLGs) paint. The electromechanical response of the embedded in biocompatible elastomer is firstly investigated through quasi-static tensile tests. measured resistance variation under applied stress confirmed piezoresistive behavior fabricated sensors, showing gauge factor 8 at 20%....

The present study focuses on the turbulent flow with separated boundary layers in a rotor-stator cavity low aspect ratio subjected to weak centripetal radial inflow. One of major results is show, help numerous experimental data, that core swirl always evolves according power law dimensionless radius. Starting from this simple behaviour law, new original properties are highlighted and particularly existence an invariant quantity region.

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 both paper and MLG/PDMS were investigated four-point probe measurements. The results show that annealed is characterized sheet resistance ~ 0,69 Ω/□ which does not increase significantly polymer infiltration. Moreover electromechanical behaviour...