Solar Impulse Plane

Solar Impulse Plane Could Set More World Records

A solar-powered plane that has shattered three world records plans to go the distance again this year. The pilots of the "Solar Impulse" want to fly more than 1,500 miles (2,500 kilometers) without a drop of fuel during a two-day journey — a dress rehearsal for the ultimate goal of flying around the world in 2014.

Two Swiss pilots, Bertrand Piccard and Andre Borschberg, plan to switch off on flying the solar-powered plane at a technical stopover in Spain during the upcoming flight scheduled for May or June. That would allow them to tag-team the 48-hour flight over the Pyrenees Mountains (the natural border between France and Spain) and the Mediterranean Sea so that they can safely land in Morocco.

The Solar Impulse team has already put seven years of work into their aircraft design with the wingspan of an Airbus A340 jetliner, the weight of a family car and the engine power of a scooter. Solar Impulse's four propellers draw an average of 8 horsepower — about what the Wright Brothers had available when they first flew in 1903. Each of the four engine pods also have lithium polymer batteries.

Solar cells cover the upper wing to harness the power of sunlight in flight. The aircraft also has a strong, lightweight structure based on carbon fiber-honeycomb composites.

That design helped Solar Impulse set a new flight-time record as a manned plane powered only by sunlight during a day-long voyage in 2010. It also set endurance and altitude records during the flight that lasted 26 hours, 10 minutes and 19 seconds.

Such solar-powered aeronautic feats do more than just impress — they also raise new possibilities for commercial planes that could rely on electricity rather than jet fuel. Electric motors could be far more efficient than today's jet engines, but electric planes remain limited by the weight of heavy batteries needed to store electricity.

Still, Solar Impulse has proved that the right combination of renewable energy and lightweight materials could theoretically keep a plane airborne almost indefinitely.

Source: http://www.huffingtonpost.com/

Enzyme Battery

New research at Concordia University is bringing the world one step closer to cleaner energy. It is now possible to extend the length of time a battery like enzyme can store energy from seconds to hours, as shown in a study published in the Journal of The American Chemical Society. Concordia Associate Professor László Kálmán — along with his colleagues in the Department of Physics, graduate students Sasmit Deshmukh and Kai Tang — has been working with an enzyme found in bacteria that is crucial for capturing solar energy. Light induces a charge separation in the enzyme, causing one end to become negatively charged and the other positively charged, much like in a battery. The hope is that such batteries are more sustainable in the long run with less environmental effects.


In nature, the enzyme energy is used immediately, but Kálmán says that to store that electrical potential, he and his colleagues had to find a way to keep the enzyme in a charge-separated state for a longer period of time.

"We had to create a situation where the charges don’t want to or are not allowed to go back, and that’s what we did in this study," says Kálmán.

Kálmán and his colleagues showed that by adding different molecules, they were able to alter the shape of the enzyme and, thus, extend the lifespan of its electrical storage potential.

In its natural configuration, the enzyme is perfectly embedded in the cell’s outer layer, known as the lipid membrane. The enzyme’s structure allows it to quickly recombine the charges and recover from a charge separated state.

However, when different lipid molecules make up the membrane, as in Kálmán’s experiments, there is a mismatch between the shape of the membrane and the enzyme embedded within it. Both the enzyme and the membrane end up changing their shapes to find a good fit. The changes make it more difficult for the enzyme to recombine the charges, thereby allowing the electrical potential to last much longer.

"What we’re doing is similar to placing a race car in on snow-covered streets," says Kálmán. The surrounding conditions prevent the race car from performing as it would on a racetrack, just like the different lipids prevent the enzyme from recombining the charges as efficiently as it does under normal circumstances.

Photosynthesis, which has existed for billions of years, is one of the earliest energy-converting systems. "All of our food, our energy sources (gasoline, coal) — everything is a product of some ancient photosynthetic activity," says Kálmán.

But he adds that the main reason researchers are turning to these ancient natural systems is because they are carbon neutral and use resources that are in abundance: sun, carbon dioxide and water. Researchers are using nature’s battery to inspire more sustainable, man made energy storage systems.

For a peek into the future of these technologies, Kálmán points to medical applications and biocompatible batteries. Imagine batteries made of enzymes and other biological molecules. These could be used to, for example, power a monitor inside a patient from post surgery. Unlike traditional batteries that contain toxic metals, biocompatible batteries could be left inside the body without causing harm.

Sony has developed a biological battery that generates electricity from sugar in a way that is similar to the processes observed in living organisms. The battery generates electricity through the use of enzymes that break down carbohydrates, which are, in essence, sugar. Almost any liquid or moist object that has enough ions to be electrically conductive can serve as the electrolyte for a cell.

What is novel for this enzyme battery is use the enzyme to store energy for extended periods of time.

Source: http://www.enn.com/