Lighter coaxial cables based on carbon nanotube nano-coating
Replacing the outer conductor with the new nanotube-based, flexible, high-performance coating would benefit airplanes and spacecraft, in which the weight and strength of data-carrying cables are significant factors in performance, potentially making common coaxial cables 50 percent lighter
Rice research scientist Francesca Mirri, lead author of the paper, made three versions of the new cable by varying the carbon-nanotube thickness of the coating. She found that the thickest, about 90 microns — approximately the width of the average human hair — met military-grade standards for shielding and was also the most robust. It handled 10,000 bending cycles with no detrimental effect on the cable performance.
"Current coaxial cables have to use a thick metal braid to meet the mechanical requirements and appropriate conductance," Mirri said. "Our cable meets military standards, but we’re able to supply the strength and flexibility without the bulk."
A coating of carbon nanotubes, seen through a clear jacket, replaces a braided metal outer conductor in an otherwise standard coaxial data cable. Rice University scientists designed the cable to save weight for aerospace applications. Image courtesy of Jeff Fitlow, Rice University.
Coaxial cables consist of four elements: a conductive copper core, an electrically insulating polymer sheath, an outer conductor and a polymer jacket. The Rice lab replaced only the outer conductor by coating sheathed cores with a solution of carbon nanotubes in chlorosulfonic acid.
Compared with earlier attempts to use carbon nanotubes in cables, this method yields a more uniform conductor and has higher throughput, Pasquali said. "This is one of the few cases where you can have your cake and eat it, too," he said. "We obtained better processing and improved performance."
Replacing the braided metal conductor with the nanotube coating eliminated 97 percent of the component’s mass, Mirri said.
She said the lab is working on a method to scale up production. The lab is drawing on its experience in producing high-performance nanotube-based fibers.
"It’s a very similar process," Mirri said. "We just need to substitute the exit of the fiber extrusion setup with a wire-coating die. These are high-throughput processes currently used in the polymer industry to make a lot of commercial products. The Air Force seems very interested in this technology, and we are currently working on a Small Business Innovation Research project with the Air Force Research Laboratory to see how far we can take it."
Read the abstract at https://pubs.acs.org/doi/abs/10.1021/acsami.5b11600
Complex Flows of Complex Fluids (Pasquali Lab): https://pasquali.rice.edu/home
Wiess School of Natural Sciences: https://naturalsciences.rice.edu