by Clarence Oxford
Los Angeles CA (SPX) Mar 30, 2026
A cross-disciplinary workforce at Rice College has developed a brand new sort of electrical heating ingredient that makes use of carbon nanotube fibers to ship excessive energy in flowing gases whereas remaining light-weight and strong.
In work reported within the journal Small, the researchers present that wires and materials constructed from carbon nanotube fibers, or CNTFs, can present considerably extra heating energy per unit mass than standard metal-alloy heaters when positioned instantly in gasoline streams, pointing to a brand new pathway for electrifying industrial warmth.
Industrial crops routinely warmth gases for chemical manufacturing, drying, thermal remedy and manufacturing, and this warmth is normally equipped by burning fuels, creating a serious supply of carbon emissions.
Switching to electrical heating might seem simple, because it depends on Joule heating in resistive parts, however heating transferring gases imposes stringent constraints: gadgets should switch warmth rapidly and uniformly into the gasoline whereas avoiding sizzling spots, deformation and failure underneath excessive temperatures.
Immersion heaters positioned instantly within the gasoline move can enhance effectivity but additionally expose the heating ingredient to a a lot harsher surroundings, coupling geometry, mechanical stability and thermal efficiency.
“One of the crucial cussed constraints is dimension,” stated Daniel J. Preston, assistant professor of mechanical engineering at Rice, whose lab research high-performance thermal administration techniques.
Thinner parts trade warmth with gases extra successfully, but standard steel alloys are exhausting to manufacture, deal with and function reliably at very small diameters, limiting design choices for gasoline heaters.
CNTFs supply an alternate as a result of they mix appropriate electrical resistivity for Joule heating with distinctive strength-to-weight ratios and unusually excessive thermal conductivity in contrast with customary heater supplies.
“Carbon nanotube fibers behave very otherwise from steel wires,” stated Matteo Pasquali, the A.J. Hartsook Professor of Chemical and Biomolecular Engineering and director of the Carbon Hub at Rice College.
“They’re light-weight, versatile and remarkably robust, which permits us to contemplate heater geometries and fabrication strategies that will be impractical with standard supplies,” Pasquali stated.
As a substitute of adapting CNTFs to current coil-like designs, the workforce constructed heaters made totally from the fibers in configurations that included single filaments, parallel arrays and textile-style materials.
The researchers centered on particular energy loading, outlined as the utmost heating energy per unit mass {that a} gadget can maintain earlier than it fails, as a key efficiency metric for evaluating supplies and designs.
Throughout a number of geometries and working situations, CNTF heaters constantly achieved greater particular energy loadings than comparable metal-alloy parts, particularly in nonoxidizing environments the place carbon-based supplies tolerate a lot greater temperatures with out degrading.
From a heat-transfer perspective, the excessive thermal conductivity of CNTFs performed an essential function in efficiency.
“Their excessive thermal conductivity helps distribute warmth and suppress localized sizzling spots, that are a typical reason behind heater failure,” stated Geoff Wehmeyer, assistant professor of mechanical engineering and an skilled in nanoscale warmth transport.
“That warmth spreading basically modifications how these gadgets behave underneath excessive situations,” Wehmeyer added.
The examine emphasizes that efficiency positive factors stem not solely from the intrinsic properties of CNTFs but additionally from the brand new gadget architectures these properties allow.
As a result of CNTFs will be produced at extraordinarily small diameters whereas retaining mechanical robustness, they open heater design prospects which can be troublesome or inconceivable to realize with conventional steel wires.
“Supplies solely develop into impactful when you possibly can reliably construct with them,” Pasquali stated.
“CNTFs present uncommon flexibility: For instance, you possibly can tie a knot in them they usually do not break; this expands the obtainable design area,” he stated.
A particular facet of the mission is its use of textile-inspired manufacturing, the place CNTF yarns are woven, knitted and assembled into light-weight, high-surface-area constructions nicely suited to immersion heating.
Vanessa Sanchez, assistant professor of mechanical engineering at Rice, contributed experience in superior manufacturing and textile applied sciences to assist translate nanoscale fibers into sensible device-scale techniques.
“Textile strategies give us extraordinary freedom in creating three-dimensional architectures,” Sanchez stated.
“We will design heaters which can be light-weight, porous and mechanically compliant whereas remaining electrically purposeful,” she stated.
In contrast with inflexible steel meshes, CNTF materials exhibited extra uniform heating and fewer sizzling spots, once more reflecting the flexibility of the fibers to unfold warmth and keep secure temperatures throughout complicated geometries.
The mission introduced collectively specialists in supplies synthesis, nanoscale warmth switch, gadget engineering and manufacturing, in addition to industrial companions.
The analysis workforce collaborated carefully with industrial researchers Robert Headrick and Dhruv Arora at Shell, together with engineers at DexMat, an organization that has scaled up CNTF manufacturing and commercialization.
“This work required a number of layers of experience,” Wehmeyer stated.
“Producing high-quality CNTFs is simply the place to begin. Understanding how they carry out thermally and integrating them into purposeful gadgets is equally essential,” he stated.
Analysis Report:Excessive Particular Energy Loading of Carbon Nanotube Fiber Units for Fuel Heating
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Rice College
Powering The World within the twenty first Century at Vitality-Every day.com
