Nanomaterials

Done by: Guan Ruofei 3P3 (6)

Content

What are nanomaterials? Carbon nanotube Nano copper Nano silver References

What are nanomaterials?

Nanomaterials is a field which takes a materials science-based approach to nanotechnology. It studies materials with morphological features on the nanoscale, and especially those which have special properties stemming from their nanoscale dimensions.

Nanoscale is usually defined as smaller than a one tenth of a micrometer in at least one dimension

Carbon nanotube

Carbon nanotubes (CNTs) are allotropes of carbon with a cylindrical nanostructure. Nanotubes have been constructed with length-to-diameter ratio of up to 132,000,000:1, which is significantly larger than any other material.

Uses of carbon nanotube

These cylindrical carbon molecules have novel properties that make them potentially useful in many applications in nanotechnology, electronics, optics and other fields of materials science, as well as potential uses in architectural fields. They exhibit extraordinary strength and unique electrical properties, and are efficient thermal conductors.

Limitation of carbon nanotube

Their final usage, however, may be limited by their potential toxicity and controlling their property changes in response to chemical treatment.

Nano copper

Copper nanoparticles smaller than 50 nm are considered super hard materials that do not exhibit the same malleability and ductility as bulk copper.

Uses of nano copper

It is an ideal medicament in the prevention and treatment of osteoporosis, primary and secondary osteoporosis, and fracture resulted from osteoporosis, its curative effect is definite, and there is little toxic and side effect.

Nano silver

Silver nanoparticles are nanoparticles of silver, i.e. silver particles of between 1 nm and 100 nm in size. While frequently described as being 'silver' some are composed of a large percentage of silver oxide due to their large ratio of surface to bulk silver atoms.

Uses of nano silver

Appliances such as refrigerator or air conditioner with silver nano coating to their inner surfaces for can gain an overall anti-bacterial and anti-fungal effect. As air circulates, the coated surfaces contact with the silver ions which can resist any airborne bacteria, which in turn suppress the respiration of bacteria, adversely affects bacteria's cellular metabolism and inhibits cell growth.

Uses of nano silver

There is an effort to incorporate silver nanoparticles into a wide range of medical devices:

bone cement

surgical instruments,

surgical masks,

wound dressings.

treatment of HIV-1.

Difference between nano-silver and colloidal silver

The primary benefit of nano silver, as opposed to other colloidal silver preparations, is increased surface area of the smaller particles, which boosts their reactivity. Perhaps even more importantly, the small size of the particles prevents them from becoming lodged in internal tissue, and creating toxicity or discoloration.

Food for thought

It is often claimed that nano silver has beneficial effects on the human immune system . While it's true that most people who take nano silver report improved health and strong immune function, the direct connection between nano silver and the immune system remains elusive. It is likely, instead, that the silver particles reduce the workload of the immune system by combating bacteria and viruses the body's natural defenses would otherwise have to confront.

References http://en.wikipedia.org/wiki/Carbon_nanotube http://www.advanceddynamics-usa.com/xue_files/image004.jpg http://en.wikipedia.org/wiki/Silver_Nano http://www.nanobiosilver.com/images/silvert2-ellectronsmall.jpg http://www.ehow.com/facts_5009003_advantages-nano-silver-

treatment-aids.html http://en.wikipedia.org/wiki/File:C60_Buckyball.gif http://en.wikipedia.org/wiki/Silver_nanoparticles http://thetechnologicalcitizen.com/wp-content/uploads/2010/01/

Question.jpg http://www.sumobrain.com/patents/wipo/Use-nano-copper-

powder-in/WO2004067016.html