A team of physicists from the University of Arkansas has successfully developed a circuit capable of capturing the thermal motion of graphene and converting it into an electric current.
In order to provide clean, unlimited, low-voltage power for small devices or sensors, a graphene-based energy spray-crop circuit can be incorporated into the chip, said Paul Thibado, professor of physics and lead researcher at Discovery.
Findings, published in the journal Physical review e, A proof of the theory that physicists developed in the U.S. three years ago that a single layer of carbon atoms – ripples and buckles in the way that energy promises to be harvested.
The idea of harvesting energy from graphene is controversial because it refutes the well-known statement of the physicist Richard Feynman that the thermal motion of atoms known as Brownian motion cannot work. Thebedo’s team discovered that graphene’s thermal motion at room temperature in fact induces an alternating current (AC) in the circuit, which is considered to be an impossible achievement.
In the 1950s, physicist L’Brn Brilui published a landmark paper, refuting the idea that adding a diode, a one-way electrical gate, to a circuit was a way to get energy at Brown’s speed. Knowing this, Thibado’s group created their circuit with two diodes to convert AC to direct current (DC). By letting current flow through the opposing diodes both ways, they provide a separate path through the circuit, producing a pulsing DC current that acts on the load resistor.
In addition, they found that the amount of power delivered by their design increased. “We’ve also found that the -n-, f, switch-like behavior of diodes, rather than reducing what was previously thought, expands the power delivered,” Thibado said. “The rate of change in the resistance provided by the diode adds an additional factor to the power.”
The team used a relatively new field of physics to prove that diodes have increased the power of the circuit. “While proving this power growth, we drew from the field of the emergence of stochastic thermodynamics and expanded the almost century-old, nicist celebration theory,” said Pradeep Kumar, associate professor and associate professor of physics.
According to Kumar, the graph and the circuit are symbiotic. Although the thermal atmosphere is working on the load resistor, the graphene and the circuit are at the same temperature and heat does not flow between the two.
This is an important difference, Thibado said, because the temperature difference between the graphene and the circuit, in the circuit that produces the circuit, contradicts the second law of thermodynamics. “This does not mean that the second law of thermodynamics is violated, or that there is no need to argue that Maxwell’s daemon is separating hot and cold electrons,” Thibado said.
The team also found that the relatively slow motion of graphene induces current at lower frequencies in the circuit, which is important from a technical point of view because electronics operate more efficiently at lower frequencies.
“People think that the current flowing in the resistor causes it to heat up, but the Brownian current does not. In fact, if no current was flowing, the resistor would cool down,” Thibado explained. “What we did was recreate the current in the circuit and make it something useful.”
The team’s next objective is to determine whether a DC current can be stored in a capacitor for later use, a goal that needs to miniature the circuit and create a pattern on a silicon wafer or chip. If these millions of small circuits can be built at 1-millimeter by a 1-millimeter chip, it could do the job of low-power battery replacement.
Video: https://www.youtube.com/watch?v=KiLTEjm8zLw&feature=emb_logo
The University of Arkansas has a U.S. And some patents on Technol on G are pending in the international markets and it has been licensed for commercial applications by the Technol VG Ventures Department of the University. Researchers Surendrasinh, University Professor of Physics; ; Hugh Churchill, associate professor of physics; And Jeff Dix, an assistant professor of engineering, contributed to the work, which was funded by the Chancellor’s Commercial Fund, supported by the Chancellor’s Family Charitable Support Foundation.
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