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Nano-coating makes coaxial cables lighter

Scientists replace metal with carbon nanotubes for aerospace use

January 27, 2016
Rice University
Scientists use carbon nanotubes to make durable, flexible coaxial cables for aerospace applications with half the weight.

Rice University research scientist Francesca Mirri holds a standard coaxial data cable (bottom) and a new cable with an outer conductor of carbon nanotubes.
Credit: Jeff Fitlow

Common coaxial cables could be made 50 percent lighter with a new nanotube-based outer conductor developed by Rice University scientists.

The Rice lab of Professor Matteo Pasquali has developed a coating that could replace the tin-coated copper braid that transmits the signal and shields the cable from electromagnetic interference. The metal braid is the heaviest component in modern coaxial data cables.

The research appears this month in the American Chemical Society journal ACS Applied Materials and Interfaces.

Replacing the outer conductor with Rice's flexible, high-performance coating would benefit airplanes and spacecraft, in which the weight and strength of data-carrying cables are significant factors in performance.

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."

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."

Story Source:

Materials provided by Rice University. Original written by Mike Williams. Note: Content may be edited for style and length.

Journal Reference:

  1. Francesca Mirri, Nathan Orloff, Aaron Michael Forster, Rana Ashkar, Robert James Headrick, E.Amram Bengio, Christian Long, April Choi, Yimin Luo, Angela R. Hight Walker, Paul Butler, Kalman B Migler, Matteo Pasquali. Lightweight, flexible, high-performance carbon nanotube cables made by scalable flow coating. ACS Applied Materials & Interfaces, 2016; DOI: 10.1021/acsami.5b11600

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Rice University. "Nano-coating makes coaxial cables lighter: Scientists replace metal with carbon nanotubes for aerospace use." ScienceDaily. ScienceDaily, 27 January 2016. <>.
Rice University. (2016, January 27). Nano-coating makes coaxial cables lighter: Scientists replace metal with carbon nanotubes for aerospace use. ScienceDaily. Retrieved October 27, 2016 from
Rice University. "Nano-coating makes coaxial cables lighter: Scientists replace metal with carbon nanotubes for aerospace use." ScienceDaily. (accessed October 27, 2016).