It’s an intriguing mental exercise trying to flip the tables on nature as an inspiration for art to start discussing ‘artmimetics’ as they seem to be doing at Northeastern University (Boston, Massachusetts, US), according to a Dec. 11, 2013 news item on Azonano,
There are examples of art imitating nature all around us—whether it’s Monet’s pastel Water Lilies or Chihuly’s glassblown Seaforms, the human conception of natural phenomena dazzles but does not often surprise.
Yet when associate professor of physics Latika Menon peered under the electron microscope last fall, she discovered the exact opposite. Instead of art imitating nature, she found nature imitating art.
The Dec. 10, 2013 Northeastern University news release by Angela Herring, which ‘inspired’ the news item, describes how Menon and her colleagues came to reverse the inspirational direction,
Menon grew up in the eastern region of India and was vaguely familiar with a cultural dance from the western state of Rajasthan known as the Bhavai pot dance. Nimble dancers sway their hips as a tall stack of wide-bellied pots balances gingerly atop their heads. Back in the lab at Northeastern, Menon’s team recently created gallium nitride nanowires, which bore a striking resemblance to that stack of pots.
What’s more, a postdoctoral research associate in Menon’s lab, Eugen Panaitescu, jumped on the bandwagon with a cultural art reference of his own. Panaitescu, who hails from Romania, also saw his country’s famous Endless Column reflected in the nanowires. Dedicated to the fallen Romanian heroes of World War I, Constantin Brancusi’s 96-foot-tall monolith is constructed of 17 three-dimensional rhombuses, periodically wavering from a wider circumference to a narrower one.
The news release goes on to explain more about applications using gallium nitride and why Menon’s insight may prove useful in developing new uses for gallium nitride nanowires,
… Gallium nitride is used across a range of technologies, including most ubiquitously in light emitting diodes. The material also holds great potential for solar cell arrays, magnetic semiconductors, high-frequency communication devices, and many other things. But these advanced applications are restricted by our limited ability to control the material’s growth on the nanoscale.
The very thing that makes Menon’s nanowires beautiful represents a breakthrough in her ability to process them for these novel uses. She deposited onto a silicon substrate small droplets of liquid gold metal, which act as catalysts to grab gaseous gallium nitride from the atmosphere of the experimental system. The net forces between the tiny gold droplet, the solid substrate, and the gas cause the nanowire to grow in a particular direction, she explained. Depending on the size of the gold catalyst, she can create wires that exhibit periodic serrations.
“It first tries to grow outward, but that gives the gold a larger surface area,” she said. “So now the wire gets pulled in the inward direction, and then the gold gets a smaller surface area, so it grows outward again.” This inward and outward growth repeated itself again and again to create a periodic structure nearly 6 million times smaller than the endless column and is significantly more promising for its use in advanced devices.
“That there is very little implementation of nanowire technology in electronics or optical devices is due to the fact that it’s very hard to control their shape and dimensions,” said Menon. But now that she has a very simple way of controlling growth, the next step is to control the size of the catalytic droplet with which she starts.
Another advantage of Menon’s approach is using what Panaitescu called “macroscopic techniques” to create nanoscale materials, thus making it scalable and inexpensive. “We just control a few parameters and then leave it, let it do it’s natural thing,” explained Menon.
Here’s an image the researchers have supplied to illustrate their insights and their work,
I’m not sure I can connect the imagery in this pot dance video (it does show some pretty astonishing feats of balance) with any of the images from Menon’s lab but sometimes the source of an inspiration is not readily accessible to those who are not amongst the inspired or perhaps there other versions of the dance that make it more obvious to an untrained eye,
Here’s an image of the other artistic inspiration, Constantin Brancusi’s Endless Column found on Dr. Cătălina Köpetz’s (University of Maryland) webpage featuring Brancusi’s work along with this quote from him “Create like a god, comand like a king, work like a slave.”Interestingly, Dr. Köpetz is a social psychologist working in the university’s Center for Addictions, Personality, and Emotion Research.
For anyone who’d like to read more about Menon’s work, here’s a link to a webpage featuring a PDF selection of her papers and a citation for her latest paper on the work described in the news release,
Vapor–liquid–solid growth of serrated GaN nanowires: shape selection driven by kinetic frustration by Zheng Ma, Dillon McDowell, Eugen Panaitescu, Albert V. Davydov, Moneesh Upmanyu and Latika Menon, Physics Faculty Publications (2013)
Compound semiconducting nanowires are promising building blocks for several nanoelectronic devices yet the inability to…
The paper is open access although you will have to click a few times to retrieve it.