Today's post deals with news of the really tiny.
We'll start at nanoscale -- and that's as big as we'll consider today. (One nanometer, 1 billionth of a meter, is the scale of small molecules. Living cells are no larger than microscale, measured in millionths of meters.)
There's been a fair amount of uncertainty about the health implications of nanoparticles. Why? Much of the allure of nanotech has been that materials often act differently in nanoscale particles than in bulk -- and yet for a long while, safety studies (if any) were performed only using bulk quantities.
A few years ago, at a nanotech conference, an insurance-company rep brought up, off the record, fears of a parallel between nanomaterials and asbestos. Asbestos is a useful material whose health implications (asbestosis and mesothelioma) went unrecognized for decades. Related health science was behind the curve and insurers were taken entirely by surprise.
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| Chemotherapy with nanoparticles |
So what are nanoscale particles of zinc oxide in some new sunblocks doing to us? Or the nanoscale silver particles sometimes used as antibacterial agents? Or nanoscale ... whatever in cosmetics?
Although this article has languished in my files for several months, it's encouraging to note (from
IEEE Spectrum) that "
New Study Indicates Nanoparticles Do Not Pass Through Skin."
Sticking for a bit with nanotech, consider (again from
IEEE Spectrum) that "
Hybrid Nanomaterial Converts Both Light and Heat to Electricity." Many forms of distributed tech require devices to power themselves by local harvesting of energy. (Remember when that meant self-winding watches?) The article's conclusion:
"By increasing the number of the micro-devices on a chip, this
technology might offer a new and efficient platform to complement or
even replace current solar cell technology."
Now let's consider some
really small stuff ...