Influence of the chemical structure of diisocyanate on the electrical and thermal properties of polymerized polyurethane-graphene composite films.

If the conductivity and thermal properties of polyurethane films are improved with fillers, they can be used in wearable electronics, strain sensors, In this regard, the present study aims to examine the effects of various diisocyanates as hard segments on polyurethane-graphene (PU/G) nanocomposites. To achieve this, nanocomposites are synthesized, first, and then the structural, electrical, and thermal properties of them are investigated. The results indicate that only PU/G composites based on toluene diisocyanate (TDI), methylene dicyclohexyl diisocyanate (HMDI), and hexamethylene diisocyanate (HDI) have non-zero - curves and are in the percolation zone.

2D materials coated on etched optical fibers as humidity sensor.

In this investigation, etched-fibers are coated by 2D layers such as Molybdenum disulfide (MoS), Molybdenum diselenide (MoSe) and composition of graphene and graphene oxide (G/GO) to modify humidity sensing. The relative differentiation of attenuations (RDA) in presence of relative humidity (RH) is measured by Optical Loss Test Set at two standard-wavelengths-telecommunication (1310 nm and 1550 nm). Results show that the etched single-mode fiber (ESMF) coated with G/GO has relatively high and one by one function for RDA versus RH (more than 30%).

Heterogeneous Ice Nucleation by Graphene Nanoparticles.

Nanostructure, chemical composition and size distribution of aerosols have prime important effects on their efficiency in heterogeneous ice nucleation (HIN). The ice nucleation usually requires active sites in the aerosols in order to act as ice nuclei (IN). In this study, HIN and probable active sites of the graphene-graphene oxide nanoparticles (GGON), obtained from graphite oxide by low temperature thermal shock (LTTS), were investigated.