One of the more popular stories on Yahoo! News right now is an AFP piece about the evils of carbon nanotubes:
Scientists delivered a warning Tuesday about nanotechnology after tests on lab rodents found that microscopic, needle-like fibres that are already in commercial use led to lesions similar to those caused by asbestos.
In experiments, researchers led by Ken Donaldson of the University of Edinburgh, Scotland, exposed the mesothelium lining that swathes the lungs, the abdomen and the heart to fibres measuring billionths of a metre.
The fibres resulted in the same kind of inflammation and scarring, called granulomas, that are caused by exposure to asbestos, their study said.
“The granulomas and the inflammation are extremely strong indicators of mesothelioma,” the cancer that attacks the body cavity’s lining, said co-author Andrew Maynard.
If the mice had been allowed to carry on living, cancer would most probably have developed where the fibres were present, he told AFP.
Sounds scary, right? Well, here’s a passage that’s in the SF Gate coverage of that same subject that didn’t make it into the Yahoo! News story:
The main concern, however, is the effect on people processing carbon nanotubes and manufacturing the materials containing them.
In other words, you’re not going to get lung cancer from your fishing rod or solar cell, but you might if you were to handle the graphite fibers used to make it without protection.
The SF Gate story goes on to mention that companies working with nanotubes are already taking precautions against this:
At Unidym, a Menlo Park company exploring the possibilities of using carbon nanotubes in such items as touch screens, precautions already have been taken.
“This is what we expected. It fits with the paradigm that long and skinny fibers can cause asbestosis. It does not really matter if they are made of carbon or asbestos. The key is not getting them into the body,” said Ken McElrath, vice president for product development materials at Unidym’s facility in Houston, which manufactures the carbon nanotubes.
To protect employees from breathing nanotubes, the manufacturing is conducted in closed ventilated systems. People working with the nanotubes also are protected by dust masks with respiratory filters.
McElrath said he found the study to contain some positive news: Shorter carbon nanotubes might not be harmful.
“We are using these kinds of findings in our product design,” he said. “We try to stay away from things that potentially cause problems.”
In other words, it looks like sensible measures are already in place.
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