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Communication Dans Un Congrès Année : 2012

Carbon nanotubes and graphene-based microsonar for embedded monitoring of microporosity

Bérengère Lebental
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Nawres Sridi
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Fatima Bouanis
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Costel-Sorin Cojocaru
Frédéric Bourquin
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Anne Ghis
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Résumé

Nanoporosities play a most significant role in the durability of cementitious materials, so that nanoscale features are a promising target for SHM. However, to this day, no sensor features the resolution required to investigate non-destructively these nanofeatures. To fill in this loophole, we are devising a SHM-targeted, carbon nanotubes and graphene based capacitive ultrasonic nanotransducer for microporosity assessment in concrete. In this paper, we report on the feasibility of the key building block of the proposed sensor: we have fabricated ultra-thin graphene and single-walled carbon nanotubes membranes. A breakthrough laser vibrometry experiment shows that the membranes can feature above-nanometer amplitudes of vibration over a large range of frequencies spanning from 100 kHz to 5 MHz. A detailed numerical model of the nanotransducer shows that upon embedding in a cementitious material it could determine the volume and content of the porosity in its vicinity. Such information would be invaluable in the evaluation of structural durability.
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hal-00811150 , version 1 (23-04-2012)

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  • HAL Id : hal-00811150 , version 1

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Bérengère Lebental, Nawres Sridi, Fatima Bouanis, Costel-Sorin Cojocaru, Frédéric Bourquin, et al.. Carbon nanotubes and graphene-based microsonar for embedded monitoring of microporosity. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811150⟩

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