In this blog, provide you knowledge about properties and applications of carbon nanotubes. For more information about carbon nanotubes, synthesis and its types go through the below link…..
Properties of carbon nanotubes:
- Mechanical properties
- Thermal properties
- Electrical properties
- Magnetic properties
Hardness: Under specific conditions of high temperature and pressure, graphite changes into diamond. Diamond is known as hardest material. Nanoindenter was used for the measured of the hardness this material and required as 62–152 GPa pressure. The hardness of boron nitride and diamond samples was found to be 62 and 150 GPa, respectively. The bulk modulus hardness of compressed SWNT was found 462–546 GPa while value of diamond was 420 GPa.
Strength: Carbon nanotubes have high elastic modulus and tensile strength. Due to covalent Sp2 bonds between carbon-carbon atoms and they show better result for strength. The tensile strength of a multi-walled carbon nanotube was found to 63 (GPA). The specific strength of a carbon nanotube has 49,000 KN·m·kg−1 as compared to high-carbon steel’s 155 KN·m·kg−1 that known for better materials.
Thermal properties: Both SWNT and MWNT are good thermal conductors and property called as “ballistic conductors”. Thermal conductivity of SWNT at room temperature along its tube axis is about 3600 W·m−1·K−1. The temperature stability of carbon nanotubes is required in vacuum about 2800oC and air about 750°C.
Electrical properties: If band gap is small then the electrical properties can be either semiconducting. Nanotubes can carry 4×109 A/cm2, which is 1000 times greater than metals such as copper. They are one dimensional conductor only along the axis.
Magnetic properties: It was observed that clean multi walled nanotubes do not have bulk magnetism. On the other hand, when they are placed on a flat ferromagnetic substrate then Magnetic force microscopy can detect to the fringing fields. Magnetic contrast is observed for carbon nanotubes placed on cobalt or magnetite substrates, but it is not present on silicon, gold or copper. Spin transfer of about 0.1 µB per contact carbon atom is obtained.
Applications of carbon nanotubes:
Carbon nanotubes are used in several catalytic reactions and as catalyst or catalyst supports. Carbon nanotubes are well-suited for virtually any application requiring high strength, electrical conductivity, durability, thermal conductivity and lightweight properties compared to conventional materials. Currently, carbon nanotubes are mainly used as additives to synthetics. It is commercially available as a powder (in an agglomerated form). Due to special properties it can evenly spread in the substrate.
Applications of carbon nanotubes in several area such as field emission, thermal conductivity, energy storage, conductive properties, conductive adhesive, thermal materials, Molecular electronics based on structural applications, fibers and fabrics, biomedical applications, Air & Water Filtration, catalyst supports, Other CNT applications.
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