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Carbon Nanotube-Based Fluid Flow/Shear Sensors

Published online by Cambridge University Press:  01 February 2011

Chi-Nung Ni ,
Christian P. Deck ,
Kenneth S Vecchio  and
Prabhakar R Bandaru
Chi-Nung Ni
Affiliation:
[email protected], U. of California, San Diego, Materials Science and Engineering, R273, EBU 2, 9500 Gilman Drive, La Jolla, CA, 92093, United States
Christian P. Deck
Affiliation:
[email protected], U. of California, San Diego, Materials Science and Engineering, La Jolla, CA, 92093, United States
Kenneth S Vecchio
Affiliation:
[email protected], U. of California, San Diego, Materials Science and Engineering, La Jolla, CA, 92093, United States
Prabhakar R Bandaru
Affiliation:
[email protected], U. of California, San Diego, Materials Science and Engineering, La Jolla, CA, 92093, United States
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Abstract

The response of vertically oriented multi-walled nanotubes (MWNTs) to fluid flows forms a basis for monitoring shear forces at the nanoscale. We report on the modulation of polarized light transmission through a MWNT mat, as a function of the nanotube axis relative to the laser polarization. Nanotubes are deflected under fluid flow, with fluid pressures corresponding to pico-Newton range forces. This deflection is measured as a function of transmitted laser light intensity. While the response of the CNTs to the flows could be modeled through standard elastic beam deflection theory, their recovery, after the force removal, invokes viscoelastic behavior due to CNT disentanglement. The fluid flow direction, as well as its pressure, can also be determined by monitoring the change in transmitted laser polarization.

Keywords

carbonizationopticalNi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 963: Symposium Q – Nanowires and Carbon Nanotubes – Science and Applications , 2006 , 0963-Q23-03
Copyright
Copyright © Materials Research Society 2007

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References

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