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Multi-walled carbon nanotubes have been investigated in several species for their potential to promote mutagenesis. Studies in spinach, mice, various human cell lines , and rats have shown that MWCNT exposure is associated with oxidative damage , increased apoptosis , chromosome damage, and necrosis .
Lalwani et al. have reported a novel radical initiated thermal crosslinking method to fabricated macroscopic, free-standing, porous, all-carbon scaffolds using single- and multi-walled carbon nanotubes as building blocks. [5] These scaffolds possess macro-, micro-, and nano- structured pores and the porosity can be tailored for specific ...
Soon after, ensemble membranes consisting of multi-walled and double-walled carbon nanotubes were fabricated and studied. [4] It was shown that water can pass through the graphitic nanotube cores of the membrane at up to five magnitudes greater than classical fluid dynamics would predict, via the Hagen-Poiseuille equation, both for multiwall ...
Helping to create the initial excitement associated with carbon nanotubes were Iijima's 1991 discovery of multi-walled carbon nanotubes in the insoluble material of arc-burned graphite rods; [11] and Mintmire, Dunlap, and White's independent prediction that if single-walled carbon nanotubes could be made, they would exhibit remarkable ...
Nanotubes can help with cancer treatment. They have been shown to be effective tumor killers in those with kidney or breast cancer. [4] [5] Multi-walled nanotubes are injected into a tumor and treated with a special type of laser that generates near-infrared radiation for around half a minute. These nanotubes vibrate in response to the laser ...
A nanotube is a nanoscale cylindrical structure with a hollow core, typically composed of carbon atoms, though other materials can also form nanotubes. Carbon nanotubes (CNTs) are the most well-known and widely studied type, consisting of rolled-up sheets of graphene with diameters ranging from about 1 to tens of nanometers and lengths up to ...
The exact mechanism which promotes this synergy is not clearly understood but it is believed to be linked to the unique surface chemistry of carbon nanostructures (i.e. the large aspect ratio of carbon nanotubes, high surface energy in GO sheets). Human applications of carbon nano materials have not been tested due to the unknown potential hazards.
Single-walled carbon nanotubes can be shortened in a scalable manner using oleum (100% H 2 SO 4 with 3% SO 3) and nitric acid. The nitric acid cuts carbon nanotubes while the oleum creates a channel. [6] In one type of chemical modification, aniline is oxidized to a diazonium intermediate.