US 7,947,773 B2 · Electrically conductive composite material

Abstract

An electrically conductive composite material includes metallic nanostrands distributed throughout a matrix constructed of a polymer, ceramic, or elastomer. The nanostrands may have an average diameter under four microns and an average aspect ratio over ten-to-one. Larger fibers may also be included to enhance electrical conductivity or other properties. The nanostrands and/or fibers may be magnetically oriented to enhance electrical conductivity along one direction. A pressure sensor may be formed by utilizing an elastomer for the matrix. Electrical conductivity through the composite material varies in proportion to deflection of the elastomer. A composite material may be applied to a surface as an electrically conductive paint. Composite materials may be made by cutting a blank of the nanostrands to the desired shape, inserting the matrix, and curing the matrix. Alternatively, a suspension agent may first be used to dispose powdered nanostrands in the desired shape.

Claims24

Dependent claims

A method for manufacturing a composite material capable of conducting electricity, the method comprising the steps of:

(a) forming a plurality of metallic branching nanostrands having an average diameter less than about four microns and an average aspect ratio greater than about ten-to-one;
(b) providing a plurality of fibers having an average diameter greater than about four microns;
(c) distributing the fibers substantially throughout a matrix formed substantially of a nonmetallic material;
and
(d) dispersing the metal branching nanostrands substantially throughout the matrix as liberated metallic branching nanostrands by minimal shear mixing, the liberated metallic branching nanostrands retaining substantial lengths, large aspect ratios, and abundant lateral branching.

2 more elements

Dependencies are inferred from the claim text.

Electrically conductive composite material

Life of this patent

Electrically conductive composite material

Life of this patent

Abstract

Claims24