Wiring systems powered by highly efficient superconductors have long been a dream of science, but researchers have faced such practical challenges as finding pliable and cost-effective materials. Now researchers at Tel Aviv University (TAU) have found a way to make an old idea new with the next generation of superconductors.
Boaz Almog and Mishael Azoulay working in the group of Prof. Guy Deutscher at TAU’s Raymond and Beverly Sackler School of Physics and Astronomy have developed superconducting wires using fibers made of single crystals of sapphire to be used in high powered cables. Factoring in temperature requirements, each tiny wire can carry approximately 40 times more electricity than a copper wire of the same size. They have the potential to revolutionize energy transfer, says Almog.
High-power superconductor cables take up much less space and conduct energy more efficiently, making them suitable for deployment across grids of electricity throughout a city. They will also offer a more effective method for collecting energy from renewable sources, such as solar and wind energy. Superconducting wires can also be used for energy storage and enable devices which enhance grid stability.
Beating the heat
One of the things that make our copper wires inefficient is overheating, Almog explains. Due to electrical resistance found in the metal, some of the energy that flows through the cables is cast off and wasted, causing the wires to heat up. But with superconductors, there is no resistance. A self-contained cooling system, which requires a constant flow of liquid nitrogen, keeps the wire in its superconducting state. Readily available, non-toxic, and inexpensive—a gallon of the substance costs less than a gallon of milk—liquid nitrogen provides the perfect coolant.
Even with the benefit of liquid nitrogen, researchers were still hard pressed to find a material that would make the ideal superconductor. Superconductors coated on crystal wafers are effective but too brittle, says Almog, and although superconductors on metallic tapes had some success, the product is too expensive to manufacture in mass quantities.
To create their superconductors, the researchers turned to sapphire fibers, developed by Amit Goyal, PhD, at the Oak Ridge National Laboratory, Tenn., and lent to the TAU team. Coated with a ceramic mixture using a special technique, these single-crystal fibers, slightly thicker than a human hair, have made innovative superconductors.
Going macro
Almog is currently working to produce better superconductors that could transport even larger amounts of electric current.
One area where such superconductors could lend a hand is in collecting renewable energy sources. “Sources such as wind turbines or solar panels are usually located in remote places such as deserts or offshore lines, and you need an efficient way to deliver the current,” explains Almog. These superconductors can traverse the long distances without losing any of the energy to heat due to electrical resistance.
Superconducting cables could also be an efficient way to bring large amounts of power to big cities. “If you want to supply current for a section of a city like New York, you will need electric cables with a total cross-section of more than one meter by one meter. Superconductors have larger current capacities using a fraction of the space,” says Almog. Different parts of a city could be cross-wired, he adds, so that in the event of a blackout, power can be easily rerouted.
