CNTs have been successfully applied in pharmacy and medicine due to their high surface area that is capable of adsorbing or conjugating with a wide variety of therapeutic and diagnostic agents (drugs, genes, vaccines, antibodies, biosensors, etc.). Moreover, CNTs have been recently revealed as a promising antioxidant.
Carbon Nanotubes Properties
- CNTs have high thermal conductivity.
- CNTs have high electrical conductivity.
- CNTs aspect ratio.
- CNTs are very elastic ~18% elongation to failure.
- CNTs have very high tensile strength.
- CNTs are highly flexible — can be bent considerably without damage.
- CNTs have a low thermal expansion coefficient.
Nanotubes have high tensile strength , so they are strong in tension and resist being stretched.
Fullerene is able to fit inside the hydrophobic cavity of HIV proteases, inhibiting the access of substrates to the catalytic site of enzyme. It can be used as radical scavenger and antioxidant. In addition, fullerenes have been used as a carrier for gene and drug delivery systems.
A lubricant is a substance that helps to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces.
What is the best lubricant for tractor roller? Explanation: Generally, grease is used for the tractor rollers as they are high pressure and low speed vehicles. Grease is a cheaper one.
Water is generally not very good at separating two surfaces that are in contact but it disperses too easily. However, it is quite fluid in movement so if you have a large enough amount of water, it can be a good lubricant but only in specific circumstances.
A solid lubricant is a material used as powder or thin film which reduces friction and wear of contacting surfaces in relative motion and provides protection from damage. Solid lubricant friction is a special form of friction which occurs when using solid lubricants. Many materials qualify as solid lubricants.
The delocalised electrons are free to move through the structure, so graphite can conduct electricity. The layers in graphite can slide over each other because the forces between them are weak. This makes graphite slippery, so it is useful as a lubricant .
The two main dry lubricants are graphite and molybdenum disulfide. They offer lubrication at temperatures higher than liquid and oil-based lubricants operate. Dry lubricants are often used in applications such as locks or dry lubricated bearings.
Dry spray lubricants, most commonly graphite, don't spray on completely dry, but their solvents evaporate rapidly, leaving behind a dry film. Dry lubricants are good for interior hinges, interior locks, drawer slides, and toolbox drawers.
The greatest benefit to using graphite (rather than oil) is that the graphite leaves no sticky residue that may later attract dust. This is because the lubricating properties of graphite lie in its weak covalent bonds that allow the layers of graphite to “slide” on top of one another with very little resistance.
Mylvaganam and Zhang found that the nanotubes were resistant to bullet speeds of over 2000 m/s, even after multiple impacts. Although they stop bullets from penetrating, they do this by dissipating force over an area larger than the bullet, which can still cause injuries known as blunt force trauma.
You probably have the ingredients to produce CNTs in your pantry. (But don't try it at home—your oven's not hot enough.) Baking soda, table salt, and detergent are surprisingly effective ingredients for cooking up carbon nanotubes. Each tube is made from a rolled-up lattice of hexagonally arranged carbon atoms.
Carbon nanotubes are the strongest and stiffest materials yet discovered in terms of tensile strength and elastic modulus respectively. This strength results from the covalent sp2 bonds formed between the individual carbon atoms.
Carbon nanotube-metal matrix composites are essential for various industrial and structural applications and can act a replacement for steel.
Carbon nanotubes have a very high melting point, as each carbon atom is joined to three other carbon atoms by strong covalent bonds. This also leaves each carbon atom with a spare electron, which forms a sea of delocalised electrons within the tube, meaning nanotubes can conduct electricity.
New studies on the strength of these submicroscopic cylinders of carbon indicate that on an ounce-for-ounce basis they are at least 117 times stronger than steel and 30 times stronger than Kevlar, the material used in bulletproof vests and other products.
The new material, a sponge-like configuration with a density of just 5 percent, can have a strength 10 times that of steel. In its two-dimensional form, graphene is thought to be the strongest of all known materials.
Graphene is a two-dimensional material, basically a single layer of graphite, with carbon atoms arranged in a hexagonal, honeycomb lattice. Carbon nanotubes are hollow, cylindrical structures, essentially a sheet of graphene rolled into a cylinder.
Summary: Carbon nanotubes are supermaterials that can be stronger than steel and more conductive than copper, but they're rare because, until now, they've been incredibly expensive.
