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Triboluminescence flashes from high-speed ruptures in carbon nanotube Macro-Yarns

last modified Dec 06, 2017 12:41 PM
A new paper by Thurid S.Gspan, Nigel H. H. Ngern, Andrew Fowler, Alan H. Windle, Vincent B.C.Tan, James A. Elliott is published in Materials Letters.

During tensile tests of carbon nanotube (CNT) macrostructures (ribbons, ropes and tows) under dynamic strain rates (1000 s–1), we recorded temporally sporadic, spatially localized visible light emissions (“flashes”) of less than 1.5 µs duration. The flashes occurred at the fracture sites and were, depending on the sample morphology, either distributed randomly over time (for tows) or occurred all at once over larger areas of several pixels (for ribbons). In situ thermal camera measurements, as well as ex situ analysis by electron microscopy reveal a hierarchical mechanism of overall heating over the whole sample length during straining, and localized heating around the fracture surfaces. Temperatures around the fracture tip were calculated to be of 1800 K in average. We propose that the flashes are caused by charge separation due to CNT bond fracture and gas discharge of the surrounding gases. Triboluminescence, known for larger sugar crystals, has not been observed for carbon nanotubes previously. It results from the yarn-like morphology, the ultra-high strength and thermal conductivity of our CNT fibers, which at high strain rates concentrate the strain at CNT level and lead to CNT fracture, rather than bundle sliding.

DOI:10.1016/j.matlet.2017.11.066

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Triboluminescence flashes from high-speed ruptures in carbon nanotube Macro-Yarns

Dec 06, 2017

A new paper by Thurid S.Gspan, Nigel H. H. Ngern, Andrew Fowler, Alan H. Windle, Vincent B.C.Tan, James A. Elliott is published in Materials Letters.

Welcome Cesar to the MML Group

Sep 16, 2017

We hope everyone had a great summer. We would like to welcome a new MML group member: Dr Cesar Miranda-Reyes.

Congratulations to MML Group in NT17

Jun 28, 2017

MML group, including Prof. James Elliott, Dr Thurid Gspann, Dr Adarsh Kaniyoor, Dr Jerónimo Terrones Portas, attended the NT17 in Brzail and attracted significant attentions from the related scientific community.

Congratulations to (Prof) James Elliott

Jun 15, 2017

James Elliott will be made a Professor from 1st October 2017.

Congratulations to Dr Chunlei Pei

Mar 31, 2017

Dr Chunlei Pei wins a Young Researcher Prize for an oral presentation at the UK Particle Technology forum held at University of Birmingham on 29th March 2017.

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