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    Breaking News

    OCSiAl: No Ecotoxicity Found in TUBALL Single Wall Carbon Nanotubes

    The range of applications of carbon nanotubes is continuing to increase rapidly.

    OCSiAl: No Ecotoxicity Found in TUBALL Single Wall Carbon Nanotubes
    TUBALL SWCNT (SEM image)/Courtesy OCSiAl
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    10.17.18
    Testing of the ecotoxicity potential of TUBALL single-wall carbon nanotubes carried out according to the relevant OECD guideline, has shown no toxic effects on algae, in contrast to a set of recent results on similar tests with multi-wall carbon nanotubes. Among plausible reasons for this is the unique physical nature, particularly the high flexibility, of single-wall carbon nanotubes compared with most other types of carbon nanomaterials.    
     
    The range of applications of carbon nanotubes is continuing to increase rapidly and now extends far beyond only hi-tech products to include convenience goods. This has raised concerns about potential adverse environmental effects of carbon nanotubes. A single wall carbon nanotube is a one-atom-thick sheet of graphene that is rolled into a tube: this type of nanotube possesses a number of exciting properties, including high flexibility, that is far superior to those of multi-wall carbon nanotubes or carbon fibers. Envigo, an independent European research laboratory, has conducted studies on possible ecotoxic effects of TUBALL single-wall carbon nanotubes, produced by OCSiAl. The ecotoxicity potential of these nanotubes was examined by treating algae, which are acknowledged as being a very sensitive species, with a saturated solution of the nanotubes for 72 hours, as per the OECD chemical testing guideline 201. The measured algal biomass densities and thus the growth rates demonstrated that there were no toxic effects after exposure of algae to TUBALL nanotubes. 
     
    “There is no indication that dissolved TUBALL single-wall carbon nanotubes have any intrinsic ecotoxic properties at all when tested in solution as stipulated by the testing guideline. Furthermore, unlike multiwall carbon nanotubes and carbon fibers, single-wall carbon nanotubes are highly flexible and may thus generally have a lower potential to harm the cell walls of algae,” Dr. Detlef Schuler said in his article that is currently being prepared for publication. 
     
    Fundamentally distinctive features of single-wall carbon nanotubes, compared with multi-wall nanotubes and carbon fibers, have historically been underestimated by researchers. A number of recent test results have illuminated various effects of these nanomaterials interacting with the environment. One example is a study led by the Russian Far Eastern Federal University that demonstrated both acute and chronic toxic effects of multi-wall carbon nanotubes on marine algae. The researchers concluded that mechanical damage to the cell walls was the reason for this effect and that this was due to the rigid nature of this type of nanotube. 
     
    More specific and comprehensive studies on single-wall carbon nanotubes’ potential toxic properties are expected to be conducted in the very near future, including inhalation toxicity studies to be carried according to the relevant OECD test guidelines. Tests on the migration of single-wall carbon nanotubes from a material’s matrix and case studies in the workplace to measure the exposure to inhaled nanoparticles and the environmental risk for workers are already in the public domain.
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