Not Such a Gold Standard
I’ve written half of this while traveling, and the rest while sleep-deprived. Science gets way more exciting when one is misreading every other word in a sentence. Apologies if any of that carried over!)
The Gold Standard…or is that the Silver Standard?
From slaying vampires and monsters to holding holy relics, silver has long stood as a sacred metal in religious and mythical lore. In modern times, it has done its fair share too, but, somehow, the credit always goes to gold.
Now, whether cleaning polluted water, or helping us diagnose illness, silver is becoming one of our most important elements.
“Silver nanowires have been extensively studied and used for a variety of applications, including transparent conductive electrodes for solar cells and optoelectronic devices,” said nanoscientist Yugang Sun of Argonne’s Center for Nanoscale Materials. “By chemically converting them into semiconducting silver chloride nanowires, followed by adding gold nanoparticles, we have created nanowires with a completely new set of properties that are significantly different from the original nanowires.”
“A scientist at the U.S. Department of Energy’s (DOE) Argonne National Laboratory has created visible-light catalysis, using silver chloride nanowires decorated with gold nanoparticles, that may decompose organic molecules in polluted water.”
While this is still far from advanced enough to deal with wide-spread disasters like the Gulf spill, it may lead us to new methods of cleaning polluted water. As water becomes more scarce and pollution becomes more common, this could be one of our most important lines of research.
The scientists running the study speculate that the nanowires may also be used to split water into hydrogen.
http://www.sciencedaily.com/releases/2010/06/100615122534.htm
Silver is also the focus of research that may lead to clean water at a fraction of the cost and difficulty of current methods. Utilizing the antibacterial properties of silver, nanowires and electricity work together to clean water.
“The scientists knew that contact with silver and electricity can destroy bacteria, and decided to combine both approaches. They spread sub-microscopic silver nanowires onto cotton, and then added a coating of carbon nanotubes, which give the filter extra electrical conductivity. Tests of the material on E. coli-tainted water showed that the silver/electrified cotton killed up to 98 percent of the bacteria. The filter material never clogged, and the water flowed through it very quickly without any need for a pump.”
Granted, it only takes that pesky 2% of E. Coli to make life pretty miserable, but this is a start, at least. Clean water technology needs to be one of our priorities, right alongside clean fuel.
NANOPARTICLES!
What do researches get when they add vitamin C, ascorbic acid and an antiseptic (usually found in cosmetics) to silver nitrate and the gold compound chloroauric acid? Nanoparticles, apparently.
No, not little machines running amok through your system, clearing out all of your diseases. We aren’t in *that* future(yet). These are just foundations—or building blocks–for future advances.
But, these little baubles could be a new method of drug-delivery (hello, Big Brother conspiracies!) or the foundation of new technology. (It is worth noting that there is also technology being developed that would tattle if you skip your pills. While this could be of great use , the potential is a bit worrying.)
“The precise structures of the nanoparticles were revealed using a high-resolution elemental mapping technique. The analysis shows the nanoparticles to have multiple layers, shells of gold within silver within gold, in the case of the bimetallic particles and some blending, or alloying, of the metals occurred.”
Silver Bells, Silver Bells
And, finally, in deference to the holidays: jewelry that might just help Alzheimer’s patients hold onto a bit of their past. Using technology in conjunction with beautiful things, researchers are personalizing recorded memories. Citing the impersonal disposability of technology today, researchers have started working to make technology something to hand down and treasure
I’m particularly curious to hear thoughts on this last bit. With technology advancing so quickly—and being so fragile—is it really worth making into heirlooms? Is it even feasible? From an SF point of view, it isn’t that far out there, but for practical use, I’m not so sure.


