Overview of Graphene Water Dispersion

Graphene is a two-dimensional network carbon nanomaterial. All carbon atoms inside the graphene form a unique two-dimensional hexagonal honeycomb lattice structure by sp2 hybridization. This monatomic layer structure makes graphene the thinnest and strongest material in the world. Graphene also has excellent physical and chemical properties, such as mechanical properties, thermal properties, electrical properties, and optical properties. That is why, graphene has prospects for practical application and a wider value. The graphene is also compared with other members of the carbon nanomaterials family, namely one-dimensional carbon nanotubes and zero-dimensional fullerenes.

Recently, graphene is often combined with ceramic, polymer and metal materials to prepare graphene-reinforced composites. And this situation is not only making the composite materials’ physical and chemical properties greatly improved, but also expanding the application of graphene in the field of biosensors, optoelectronic materials, and catalysts. In some applications graphene water dispersion is needed to use and gives better properties to the materials.

Dispersions of graphene are beneficial for the use of graphene in various industrial applications, such as: use as component or additive of elastomeric compositions for tires. If graphene level is 1–1.5% in the dispersion many superior properties can be achieved like an improved gas barrier effect, with consequent increase of impermeability, causing the tire to deflate more slowly; improvement of the mechanical dynamic properties, in particular rolling resistance; increase of thermal conductivity, useful for heat dissipation; increase of electrical conductivity, useful for the dissipation of electrostatic energy.

If graphene water dispersions are used as additive or component of silicon and paints compositions, increase of electrical conductivity, increase of thermal conductivity for heat dissipation can be obtained to reach conductive compounds; to give anticorrosion and antifouling properties, gas and liquid barrier effect with consequent increase of impermeability.

In textiles if graphene levels reach 40% in water dispersion good electrical conductivity for producing intelligent textiles, good thermal conductivity, liquid barrier effect, flame retardant properties and IR shielding can be obtained.

Carbon Nanotube Threads

Since its discovery, carbon nanotube (CNT) has attracted many interests in different technology fields due to its extraordinary properties. Properties such as, high strength, great electrical and thermal conductivity, light weight and flexibility made CNT one of the best materials for wide range of applications. However, from its name it can be understood that CNT is a nanoscale material which is very small to be applied for the production of daily products. Researchers all around the world are working on finding methods and techniques which could produce new materials with the extraordinary properties of CNT. Image retrieved from: https://worldindustrialreporter.com/strong-light-flexible-carbon-nanotubes-threads-with-ultrahigh-conductivity/ One of these research is focusing on the production of high strength threads that can be used in the manufacturing of fabrics, cables and ropes. An international group of scientists were able to produce a flexible conductive thread th...

Multi Walled Carbon Nanotube Dispersions

Carbon nanotubes (CNTs) have attracted enormous attention in recent years due to its unique physical, electronic, optical and potential applications in materials science and nanotechnology. The van der Waals interaction between tubes, however, makes CNTs aggregate in most organic solvents and aqueous solutions, which is the major limitation of their practical applications.Various approaches have been studied to alter the CNT surface to promote the dispersion of individual nanotubes and prevent their reaggregation. On the basis of this widely accepted viewpoint, numerous techniques such as covalent bonding, surfactant coating and polymer wrapping have been developed for surface modification or sidewall functionalization.These methods, however, are complicated, time-consuming and cause permanent damage to the CNT structure and properties of the surface, which produces residues of the dispersion agent for the final product. Figure: Single Walled Carbon Nanotube (SWCNT) It ha...

Magnesium Oxide Nanoparticles/Nanopowder and Applications

General Information about Magnesium Oxide Magnesium oxide which has the chemical formula of MgO, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of Magnesium. It is a white powder at room temperature. Magnesium Oxide has very high melting point (2825 o C) and boiling point (3600 o C). Magnesium Oxide Nanoparticles/Nanopowder an...

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