Single- and Multiwalled Carbon Nanotubes Toxicity and Potential Applications in Neuroregeneration

The use of nanomaterials in biomedical application and nanomedicine has increased dramatically in the past decade because of their unique properties and capabilities in the physiological environment. Some materials have shown an increase in their bioactivity and biodegradability as their crystallite size decreased from micron size to nanoscale.1, 2 Toxicity can be dened as the degree to which a material can damage an exposed cell or a whole organ. It should be noted that toxicity is in direct relation to the amount of damage. All materials elicit some type of responses when they come into contact with living tissues but toxicity is a dose-dependent effect.3 Therefore, when we evaluate the toxicity of a material we need to consider many parameters.