The properties of an array of carbon nanostructures or a material containing its is differ from the properties of individual components. For bulk array of carbon nanostructures it is unknown to what extent the electrons of each layer participate in conductivity, the role of defects is not defined. properties. So, this work presents some answers to these questions.
The electrical and mechanical properties of nanocomposites based on carbon nanostructures has been studied. It is sown that a t a concentration of carbon nanotubes of 15-30 wt. %, the electrical resistance of the samples decreases to 1 order, while its mechanical properties change insignificantly, which is due to the transfer of free electrons from the metal to the CNT, which is comparable to the number of electrical contacts between the constituent elements of the composite and the competition between the numbers of tu nneling and ohmic contacts.
Non-standart properties of carbon nanomaterials and nanostructures open wide possibilities of their application. The electrical resistance of bulk arrays of carbon nanotubes in cyclic loading-unloading processes was studied. It is shown that when the volume of the powder sample decreases, the resistance first decreases sharply, and at a certain degree of compression the process of its chang e begins to occur more smoothly, which is associated with increased contacts between neighboring nanostructures and van der Waals bond between them.
This work investigate electromagnetic and thermal properties of poly(lactic) acid-based composites with graphene nanoplates (GNP) and multiwalled carbon nanotubes (MWCNTs), produced by solution blending method. It was found that the MWCNT carbon nanotubes are an effective filler for both absorption and reflection of electromagnetic waves in the GHz and THz frequency domains. The higher aspect ratio of carbon nanotubes, compared to industrial MWCNT, is the cause of better electromagnetic characteristics of nanocomposites prepared by solution blending method (SB). The DSC analysis of the samples shows that the glass transition is around 60oC, followed by cold crystallization with enthalpy and melting temperature around 150oC. The TGA analysis show, that the thermal stability of PLA polymer is improved by addition of 6% MWCNTs and GNP.
The recent subject of great research challenge and one of the most active area of research for well in materials science include the development of nanofiller reinforced polymer materials for additive manufacturing application. The dispersion of nanofiller in polymer matrix is a critical issue not only for control of processing but also for pre-defined properties. Quantitative analysis of extent of dispersion of nanofiller by measuring the rheological and surface characteristics of polymer nanocomposites has great technical importance for improving processing conditions, as well as for understanding the fundamental characteristics of materials at the nanoscale. The incorporation of nanofiller graphene into polymers is a promising approach to impart certain electrical and magnetic properties, mechanical reinforcement and high thermal conductivity to the resulting material. Rheological and surface properties of the poly(lactic) acid (PLA) based nanocomposites incorporating 0-9 wt.%. graphene nanoplates (GNPs) were investigated in the present work and a new strategy to tune such properties of PLA matrix by varying filler content is proposed.
The work considers the use of carbon nanotubes to enhance the functional characteristics of polymer materials. The results on studies of the electrophysical properties of polymers doped with carbon nanotubes are presented and prospects for the use of such materials are discussed.
The results of experimental studies of the thermophysical properties of high-heat-conducting polymer micro- and nanocomposite materials based on various polymer matrices (polyethylene, polypropylene, polycarbonate and polymethylmethacrylate) and fillers (carbon nanotubes, aluminum and copper microparticles) are presented. The data on study of the heat conductivity coefficient, specific heat, and heat of crystallization of the composites in question are analyzed in a wide range of changes in the mass fraction of fillers from 0.2 to 10%.
The development of ecological and efficient vehicles powered by hydrogen or electricity is one of the priorities of the automotive industry at the moment. These new propulsion systems should come as a replacement for the internal combustion engines, which use gasoline or diesel fuel and therefore produce toxic emissions. One of the problems, that hydrogen powered vehicles face, is hydrogen storage and that is the main topic of our paper Conventional technologies for hydrogen storage, like high pressure and cryogenic reservoirs, have many drawbacks in terms of compactness, mass (weight), efficiency and safety. In order to get over these problems, there have been many researches throughout the years in effort to develop new, commercially available technologies. The most advanced storage technologies today, are tanks filled with metal hydrides which absorb hydrogen by forming chemical bonds with it, and tanks filled with large contact surface materials that are able to adsorb hydrogen. In this paper we will present the requirements that these solutions have to fulfill, their current level of development and the expectations for future improvement and usage.