Smart materials: strain sensing and stress determination by...

G - Physics – 01 – L

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G01L 1/22 (2006.01)

Patent

CA 2514496

The present invention is directed toward devices comprising carbon nanotubes that are capable of detecting displacement, impact, stress, and/or strain in materials, methods of making such devices, methods for sensing/detecting/monitoring displacement, impact, stress, and/or strain via carbon nanotubes, and various applications for such methods and devices. The devices and methods of the present invention all rely on mechanically-induced electronic perturbations within the carbon nanotubes to detect and quantify such stress/strain. Such detection and quantification can rely on techniques which include, but are not limited to, electrical conductivity/conductance and/or resistivity/resistance detection/measurements, thermal conductivity detection/measurements, electroluminescence detection/measurements, photoluminescence detection/measurements, and combinations thereof. All such techniques rely on an understanding of how such properties change in response to mechanical stress and/or strain.

La présente invention concerne des dispositifs comprenant des nanotubes de carbone capables de détecter un déplacement, un impact, une déformation et/ou une contrainte dans des matériaux, des procédés de fabrication de ces dispositifs, des procédés d'analyse/détection/surveillance de déplacement, d'impact, de déformation et/ou de contrainte via des nanotubes de carbone et, diverses applications de ces procédés et de ces dispositifs. Les dispositifs et procédés de cette invention reposent tous sur des perturbations électroniques mécaniquement induites à l'intérieur des nanotubes de carbone de façon à détecter et quantifier cette déformation/contrainte. Cette détection et cette quantification peut reposer sur des techniques qui comprennent notamment des mesures/détections de conductivité/conductance et/ou de résistivité/résistance, des mesures/détections de conductivité thermique, d'électroluminescence, de photoluminescence et des combinaisons de celles-ci. Toutes ces techniques reposent sur la compréhension des modifications de propriétés survenant en réaction à une déformation et/ou une contrainte mécanique.

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