Nanocomposites of epoxy resin with graphene nanoplates and exfoliated graphite: Synthesis and electrical properties

Abstract

.pl , Phone: þ48 22 822 02 11, Fax: þ48 22 822 59 96Nanocomposites are nowadays one of the most promising materials. Among different fillers, e.g. carbon nanotubes and silicon carbide nanowires (NWSiC), already used with epoxy resin matrices, graphene exfoliated graphite (EG) and graphene nanoplates have some characteristics that make them unique for electromagnetic shielding materials. However, there is still an unresolved problem of proper dispersion that will ensure the homogeneity of samples. To overcome this drawback, inorganic fibres were proposed. An amount of 0.25 phr (parts per hundred; filler content presented as wt.% of the whole polymeric matrix) NWSiC, added to the EG 1 phr/epoxy resin sample, efficiently prevents filler agglomeration. NWSiC were obtained in combustion synthesis and EG was produced from intercalated graphite using microwaves. Finally, nanocomposites with EG from self-propagating high-temperature synthesis were also tested. The properties of the samples have been characterized, revealing an observable improvement of pure resin features.Raw products of combustion synthesis of Si/polytetra-fluoroethylene (PTFE) stoichiometric mixture, carried out in the larger of the presented reactors.

Magnetic properties of N-doped graphene with high Curie temperature

“…The temperature of the combustion can be very high (as 5000 K) and the rate of wave propagation can be very rapid (as 25 cm/s), hence this process offers the opportunity to investigate reactions in conditions of extreme thermal gradients (as 10 5 K/cm). SHS is widely applied in producing various materials, including carbon-free, this method has not yet been applied to synthesizing CNTs 45 ; It has been known that magnesium can act as a carbon reducer to produce various solid-state structure of the carbon; for example, magnesium has been used as reducer in combustion synthesis to produce exfoliated graphite with teflon 46 , few-layer graphene with CO 47 and CO 2 (dry ice) 48 ; it also is used to react with CaCO 3 to produce few-layer graphene with a conventional calcination method 49 . However, to the best of our knowledge, our group firstly developed the high-throughput SHS method for synthesizing few-layer graphene and doping nitrogen into few-layer graphene 50 51 .…”

Self‐propagating high‐temperature fast reduction of magnesium oxalate to novel nanocarbons

“…All combustions were carried out in the high‐pressure (pre‐tested up to 20 MPa) stainless‐steel reactor (provided with the observation port for optical diagnostics and observation) following the protocol outlined elsewhere − Fig. .…”

Broadband Microwave Attenuator Based on Few Layer Graphene Flakes

“…A comparative study of the electric field emission behavior of vertically aligned few-layer graphene and carbon nanotubes was then evaluated in a parallel-plate-type setup in [25]. In the current design, the adopted graphene patch was obtained by means of an innovative technique introduced recently by the authors [26]. Expandable graphite produced and commercialized by Asbury is used as a source to obtain graphene nanoplatelets.…”