If you’re going to build a swarm of nanobots to take over the world, you’ll need a lot of very tiny batteries. You could build microscopic AAs with exceedingly diminutive tools, or turn to the best nano-scale builder known: Nature. Scientists at Yale were studying how some cells turn chemical energy into electrical energy (brain cells, the cells that give electric eels their zap) when they inadvertently created synthetic cell batteries.

The simple cells are essentially lipid sacks filled with salt water and a modified protein. When two of the synthetic cells touch, they stick together. The proteins create pores between the two cells. If the two cells have different salt concentrations, positive or negative ions will pass through the pores shared wall until salt concentrations in both cells reach an equilibrium. Stick the cells with electrodes to siphon off the ions and you’ve got a microscopic battery.

Two 200-nanoliter drops of the cells in solution can deliver electricity for about 10 minutes. An 11-microleter volume can put out a charge for more than four hours.

Researchers say the cells turn chemical energy into electrical energy at about 10 percent efficiency, which is frankly pretty terrible for a battery. But it’s pretty good when compared to tiny solar cells or piezoelectric devices that generate electricity from mechanical stress.

Link to Gizmag article

The Pharaohs built the pyramids to thwart time, to survive the elements for eternity. Nearly 4,500 years later they show few signs of erosion and will likely last for generations. Modern buildings, however, barely last a decade without significant maintenance. Thanks to engineers at MIT, that could all change. A team of civil engineers have figured out how to make standard concrete resist the ravages of time for 16,000 years.

It all comes down to “creep.” It’s the technical term for the process that makes cement break down. Basically concrete particles settle into different densities over time, thus cement cracks and crumbles. Professor Franz-Josef Ulm and his team at MIT have figured out how to manipulate concrete at the nano scale to slow creep to a crawl. Using silica fumes, a waste material from aluminum production, they’ve shown they can cut the rate of creep by nearly three times.

That makes extremely dense concrete that, on the short side, can last for more than 100 years without maintenance. The new material is also much stronger than conventional concrete, which means engineers can use less of it in construction. Says Professor Franz-Josef Ulm of MIT:

“The thinner the structure, the more sensitive it is to creep, so up until now, we have been unable to build large-scale lightweight, durable concrete structures,” said Ulm. “With this new understanding of concrete, we could produce filigree: light, elegant, strong structures that will require far less material.”

Using less concrete will also reduce CO2 emissions. Current concrete construction accounts for 2 to 8 percent of worldwide CO2 emissions.

Link to MIT article

Batteries seem to be stuck in the days of Edison—heavy, toxic bricks that hold measly amounts of energy and wear out far too quickly. Even hallowed lithium-ion batteries are expensive and unstable. Thankfully the next generation of batteries are on the horizon, and they’re hellishly awesome.

Engineers at the University of Waterloo in Canada have revived lithium-sulphur batteries. They promise to pack three times as much power as lithium-ion batteries, and weigh much less than current power cells.

Lithium-sulphur batteries aren’t anything new. They were developed ages ago, but abandoned due to high cost, poor efficiency, and short lifespan. Charging and discharging a lithium-sulphur battery involves moving lithium ions between two electrodes within the battery. Theoretically, sulphur should be able to hold twice as many lithium ions. But sulphur is an insulator, making it difficult for electrons and ions to move freely into and out of the sulphur electrode.

The scientists at Waterloo have overcome the technical issues using a nanostructure of carbon rods. Sulphur is melted into the carbon nanostructure, giving ions much better access to the sulphur. Essentially, ions and electrons can travel down the carbon rods to reach the sulphur melted between them.

The battery is in testing phases right now, which means we’ll likely not see lithium-sulphur batteries in laptops, iPods, or electric cars for a few years.

Link to Gizmodo article

Link to Technology Review article

Want to get 130 horsepower out of a 750cc engine? Blast it with compressed air. Researchers at Switzerland’s ETH Zurich school of engineering have rigged a tank of compressed air to a tiny 750cc two-cylinder, blasting it with boost right off idle. A turbo takes over at higher RPMs, providing boost for rolling acceleration. The engine puts out as much power as a 2-liter four cylinder, but consumes 30 percent less fuel.

When the engine decelerates, its cylinders pump air back into the tank. The system completely eliminates turbo lag and manages to wring more power out of smaller displacement engines. The ultimate goal? A 1-liter two-cylinder that puts out as much power as a 3-liter V6.

And the technology is cheap. The researchers say that compressed air hybrid engines would cost about 20 percent more than traditional engines, but provide vastly improved fuel economy. Compare that to gas-electric drivetrains, which are about three times more expensive than regular gasoline setups, and you have a clear winner for developing nations like India and China.

The same setup could be applied to diesel engines, which are inherently more efficient than gasoline engines.

Link to Wards article

UPDATE: It seems that in my zeal to report such a high-output, small-displacement engine, I failed to do my research. Weber Automotive GmbH is making a four-stroke 750cc two-cylinder turbo-charged engine that puts out 100 kW or about 135 horsepower. It’s called the MPE 750 (Multipurpose Engine, 750cc)and the German company is making it as a sort of drop-in power plant for anything from snowmobiles to small autos. It was used in the Rinspeed eXasis concept car, a translucent plastic buggy-like sports car. No info on the 750 MPE’s fuel consumption, but more info on the engine can be found on the Weber Motor site.

Two teams of U.S. scientists have pushed Moor’s Law into overdrive, crafting transistors and memory storage material on the nano scale. 

Jeremy Levy and his team at the University of Pittsburgh have created two-nanometer transistors out of lanthanum aluminate and strontium titanate. Levy used an atomic force microscope to etch a miniscule wire between the two insulators, creating the world’s smallest transistor. Even more intriguing, the team was able to use the microscope to “erase” the wire. Using this technique, the team could conceivably reconfigure the transistor to make memory modules. 

Levy says he got the idea for the transistor from an Etch A Sketch, which uses a stylus to scrape aluminum powder off a glass plate.

The new transistor is several times smaller than the smallest silicon transistor (currently 45 nanometers).

Even better, Levy says that atomic force microscopes could be miniaturized down to the size of a wristwatch. Not that you’d ever want to set up a nano transistor factory on your wrist, but still.

Meanwhile, engineers/scientists/all-around-good-guys-and-gals at the University of Massachusetts Amherst and the University of California Berkeley have created a method of reliably making thin-film polymer memory material. Others have tried to make polymer thin-film memory material, but it usually falls apart when spread over large surfaces.

The teams at Amherst and Berkeley used a lattice of sapphire crystals to make a grid to lay the thin-film sheet on. This makes nearly perfect arrays of film that’s 15 times denser than anything that’s ever been made before. And we’re talking dense, about 250 DVDs worth of data on a surface the size of a quarter.

Behold your Young Lady’s Illustrated Primer. Or at least the bits and pieces that could make one.

Link to University of Pittsburgh press release

Link to Wired article

Light bulbs siphon a lot of juice out of the grid, which makes them perfect targets for anyone trying to conserve power. Compact fluorescents (CFLs) have been leading the charge, armed with mercury vapor and phosphor that emits far more light per watt than hot incandescent bulbs. But they’re toxic and expensive, so engineers are looking for alternatives.

Enter LEDs, light-emitting diodes. They can be twice as efficient as CFLs and 10 times as efficient as incandescent bulbs. But they’re expensive, complex structures of gallium nitride crystals, reflectors and even sapphires. Until now. Researchers at Perdue University have figured out how to make LEDs using good-old silicon wafers. The new process could mean LEDs that compete, price-wise, with CFLs and even incandescent bulbs. And the new LEDs are efficient—between 47 to 64 percent efficient. Compare that to an incandescent bulb’s paltry 10 percent and you can see how the new lights could save a ton of electricity.

That’s not all. LED manufacturer OSRAM has developed a new LED that’s significantly brighter than existing bulbs. They’ve managed to push 500 lumens out of a single 1-mm-square LED. To put things into perspective, a 100-watt incandescent bulb puts out about 1700 lumens. The new LEDs are also extremely efficient, cranking out about 136 lumens per watt. Again, a 100-watt incandescent only manages about 17 or 18 lumens per watt. OSRAM plans to put the new bulbs on the market within a year. Possible uses include small projectors, automobile lights and interior lighting for the home.

If that wasn’t enough, the startup Vu1 is producing a new type of light bulb altogether. They’re called ESL (electron stimulated luminescence) and they use electrons to directly stimulate a layer of phosphorus on the inside of a bulb. It’s the same technology that makes the old-timey tube TVs glow. The company claims that their bulbs emit about 40 lumens per watt. The light, they say, matches incandescent light in color and quality. The bulbs should be available in September 2008 for about $12 a piece. Not cheap, but on par with the price of a dim-able CFL.

So what difference will all these newfangled bulbs make? The US uses a third of its energy for lighting. Engineers at Perdue estimate that switching out incandescent bulbs could cut US energy consumption by about 10 percent.

Link to TreeHugger article.

Link to Gizmodo article.

Link to Gizmodo article.

Turns out that your average plasma TV sucks more electricity from the grid than those fancy new plug-in hybrid cars that are coming on the market. According to officials at the Electric Power Research Institute who were quoted in a recent Associated Press article, big-screen plasma TVs drain about four times as much power as plug-in hybrids.

Why should you care? It means that the U.S. power grid is capable of handling a few million plug-in hybrids without blowing its gigantic, irreplaceable fuse. The logic goes something like this: Consumers have purchased millions of big-screen plasma sets during the past few years. They’ve all plugged them in and probably leave them on for HOURS each day. Plug-in hybrids, on the other hand, will likely be plugged in during off-peak hours, late at night while most people sleep and when the grid isn’t being taxed. 

The grid may be able to handle plug-in cars, but we’ll still need to generate more electricity to meet their demands. Hopefully that energy will come from solar and wind rather than coal-fired power plants.

Link to GlobeAuto story.

Before swarms of nanites can organize to eradicate the human race, they’ll need a leader. Engineers in Japan have made the first steps in creating such a microscopic overlord, building a nanomachine that imitates human brain cells. The tiny machine can receive information from the macro world and transmit it to a small cadre of its companions. Working in concert, teams of the molecular contraptions could do everything from terminate tumors to crunch vast amounts of data in the blink of an eye.

Dr. Anirban Bandyopadhyay of the International Center for Young Scientists, in Tsukuba, Japan, led the team that developed the nanobrain. It’s made from 17 molecules of an compound called duroquinone, 16 arranged in orbit around one. The whole thing is held together by weak hydrogen bonds. Using a scanning electron microscope, Bandyopadhyay was able to send electrical impulses to the central molecule to change its configuration or state. The lead molecule then transfers its state to the other 16, like dominoes falling one after another.

It’s basically parallel processing on a micro scale, the same kind of number crunching that our brains are capable of. In fact, Bandyopadhyay modeled the microbrain on human glial cells, which pass info between neurons in the brain. They call it “one-to-many computation” and it’s key to parallel processing.

So what can it do? Bandyopadhyay estimates that the simple assembly is capable of generating more than 4 billion different outcomes from one input instruction. There’s no comparing true parallel processing to current processors, which crunch computations linearly. Parallel processors can take on millions of lines of instruction at once. That’s the kind of computing power that can keep Moore’s Law of exponential computing growth chugging away into stratospheric heights. 

And it’s not just powerful—the nanocomputer would represent a completely new way of computing. It’s purely visual, using patterns to replace the differential equations that are at the heart of current computing.

There’s also a potential to manufacture billions of molecules of a custom drug with just one instruction. Imagine a single drop of water hitting a placid pool. Waves radiate out from the site of impact, quickly covering the entire surface. A single instruction dropped into a field of similar nanomachines would spread in the same manner.

Bandyopadhyay is currently working to create more complex versions of his nanobrain and hopes to have a functional computer within a few years. The trick is finding something other than a massive tunneling electron microscope to interact with the machines. Bandyopadhyay hopes other control methods will be developed, including optical readers for the nanocomputers, or chemical triggers for the medical nanofactories.

Link to MSNBC article.

Link to BBC article.

Photo Credit: Rensselaer/Koratkar

Cover the insides of your boiler with copper nanorods and you’ll increase its steam output by a factor of 30, granting your fire-breathing steam-turbine velocipede the supersonic speeds befitting its polished-brass fittings. Researchers at the Rensselaer Polytechnic Institute made the discovery by accident, not while tinkering in their anachronistic steampunk workshops, but while conducting routine experiments with nanoparticles. The team sprayed an invisible forest of the miniscule copper rods on the bottom of a vessel. They soon realized that water boiled in the special pot turned to steam much faster than water boiled in a plain old tea kettle. 

The trick? If you want steam, you need water and air. Boiling water turns to steam only where it comes into contact with air. In a regular pot, all of the water can be hot enough to boil, but only a fraction of it is in contact with air. The forest of copper nanorods traps air molecules, which means far more water in contact with air. It’s effective: Nanorod-coated pots produce 3,000 percent more bubbles and a ton more steam than run-of-the-mill pots.

At first glance the discovery seems only relevant to steam engine buffs. But most of our electricity generated by steam turbines: coal or natural gas heats water to produce steam that turns turbines that spins generators that produce electricity. The copper nanorods could mean more efficient steam production, which means burning less coal or natural gas. It makes most power sources get cheaper. 

Nikhil A. Koratkar, associate professor in the Department of Mechanical, Aerospace, and Nuclear Engineering at Rensselaer:

“If the time taken to boil a given quantity of water is reduced by an order of magnitude, that should translate into significant cost savings” 

Link to Rensselaer release.

Researchers in the EU-funded research consortium CONTACT have built a printer that can lay down LCD displays on virtually any substrate, from plastic to paper to fabric. The new printer can spit out displays in any shape, freeing gadget designers to create more organic forms.

Their new printer, dubbed Labratester 2, will be able to print a tiny TFT matrix on any material, then follow up with an LCD matrix. The process should allow cheap digital displays that could be printed on eyeglasses, clothing or anything else.

Link to ScienceDaily article.