Robots and ‘green energy’ win the day at intel isef – ghnews gas examples


ISEF has been honoring young researchers since 1950. Created and still run by Society for Science & the Public, this remains the world’s largest international pre-college science competition. Sponsored this year by Intel, ISEF brought together students from 81 countries, regions and territories. Their 1,383 projects competed in 22 different research categories.

“The breakthrough ideas presented by the winners and finalists demonstrate how the brilliant minds of future generations will make the world a better place,” says Maya Ajmera, president of the Society, based in Washington, D.C. “These young innovators are the stewards of our future, and we look forward to seeing all that they accomplish as they continue to pursue their interest in STEM.” (The term stands for science, technology, engineering and math.) Spritz, scrub, squeegee, repeat

A computer controls Oliver’s 12-to-15 kilogram (26-to-33 pound) device. It sprays a little water onto a window, then rubs microfiber-covered scrubbers across the glass to scrub away dirt. A windshield-washer–style squeegee removes any excess water.

When the robot needs to move from one window to another, propellers kick into gear. They push the robot away from the building. Cables then pull the robot to the next window. At this point, a different set of propellers holds the robot tight against the window as the cleaning cycle repeats.

Capacitors (Kah-PASS-ih-torz) are devices that store energy. Unlike batteries, which store energy chemically, capacitors do so by physically storing electric charge — electrons (the negatively-charged particles in atoms). Supercapacitors, of course, are capacitors that can store a relatively huge charge.

For some applications, supercapacitors outperform batteries. Why? When energy is needed, they can deliver a lot of it fast. One example where this is prized: a medical device called a defibrillator (Dee-FIB-rih-lay-tor) . It’s used to zap a person’s chest when they’re having a heart attack, says 17-year-old Meghana Bollimpalli. She’s an 11th-grader in Arkansas at Little Rock Central High School. Other uses for supercapacitors include military equipment.

One big problem, though, is the high cost of most supercapacitors. They tend to use costly elements, such as platinum. Some devices may run $4,000. Even the cheapest supercapacitors can cost about $300. Meghana thought there must be a way to cut their cost.

She started out with molasses, used tea leaves and tannin. That last material is a bitter, carbon-rich substance produced by some plants (including tea). To this mixture, she added a pinch or two of ingredients that contained nitrogen and phosphorous, which are common plant nutrients. Those elements would help the other materials store electrons, she points out.

Meghana then cooked the mix in a microwave for 30 minutes. The end result was a carbon powder. She could use it to coat an electrode in the supercapacitor, she says. (Electrodes are the parts of a capacitor or a battery where electrons are supplied to a circuit or received from that circuit.) If her new powder were packed tightly enough, it could even become the electrode.

Meghana’s material can store about 90 percent as big of a charge as an equivalent mass of some supercapacitors for sale today. But cost is where her version shines. Instead of costing hundreds of dollars, one made with her recipe would likely cost less than $1, she estimates.

Batteries don’t last forever. They’ll run down as they are used. But batteries also can run down when not in use. That happens whenever electrons or other charged particles leak from one side of a battery to the other, notes Dhruvik Parikh, 18. The senior attends Henry M. Jackson High School in Bothell, Wash.

In a battery, electrons flow from the negative electrode, known as an anode (AN-oad), through to the positive electrode, or cathode (KATH-oad). But a battery’s charge can sometimes drain down when the barrier between the positive and negative electrodes is leaky, Dhruvik explains. This can be an especially big problem for the large batteries used to store power generated by wind turbines and solar panels. Those big batteries often have liquids inside them as well (not the pasty materials typically found inside small portable batteries). With those liquids, leakage of charged particles between the two sides of the battery is even easier.

He started out with a plastic membrane 0.15-to-0.5 millimeters (0.006-to-0.02 inch) thick. Full of microscopic holes, that plastic was fairly leaky. So the teen coated it with a paste. It included a silicon-rich material called tetraethyl orthosilicate (TEH-tra-ETH-ul Or-tho-SIL-ih-kayt). When this chemical reacts with water, it makes silica. (That’s another name for silicon dioxide, the material in sand.) And that silica did a pretty good job of plugging up the tiny holes in the plastic membrane, Dhruvik found.

This novel membrane cut the leak of charged particles inside batteries by more than half, Dhruvik showed. His new material also is about 30 percent less costly than the material now used inside big liquid-filled batteries. That’s a big deal, he notes. Today, that barrier can account for up to 40 percent of a big battery’s total cost.

Seven of these “best of category” winners also earned trips overseas. Some will visit research labs in India. Others will visit science fairs or attend youth science forums in Europe. Some of the roughly 625 winners at this year’s competition even won college scholarships.

“Intel congratulates Oliver Nicholls, Meghana Bollimpalli, Dhruvik Parikh and all of the participants on their groundbreaking research,” notes Rosalind Hudnell. She is an Intel vice president and president of the Intel Foundation. “When students from different backgrounds, perspectives and geographies come together and share their ideas,” she says, “there is no limit to what they can achieve.” Other major Intel ISEF 2018 award winners