US 8,877,085 B2Granted

Piezoelectric and/or pyroelectric composite solid material, method for obtaining same and use of such a material

AssigneeUniversite Paul Sabatier Toulouse III

InventorsJean-Fabien Capsal, Charlotte David, Eric Dantras, Colette Lacabanne

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Abstract

A piezoelectric and/or pyroelectric composite solid hybrid material, includes: a solid dielectric matrix, a filler of at least one inorganic piezoelectric and/or pyroelectric material, wherein the filler includes filiform nanoparticles distributed throughout the volume of the solid dielectric matrix with an amount by volume of less than 50%, and in that the main directions of elongation of the filiform nanoparticles of the inorganic filler distributed in the dielectric matrix have a substantially isotropic distribution in the solid dielectric matrix. Also described is method for manufacturing and using such a hybrid material for producing structural parts and supported films deposited on the surface of such a substrate for: detecting mechanical stress by direct piezoelectric effect; detecting temperature variations by direct pyroelectric effect; creating a mechanical wave by reverse piezoelectric effect in a flexible audio device, in a de-icing device or in a mechanical anti-fouling device; and manufacturing a soundproof material.

Claims15

Dependent claims

A piezoelectric and/or pyroelectric composite solid material, called hybrid material, comprising:

a solid dielectric matrix (11),
an inorganic filler distributed in the solid dielectric matrix (11), said inorganic filler being composed of a material selected from the group formed of piezoelectric materials, pyroelectric materials, and piezoelectric and pyroelectric materials,
said inorganic filler comprising solid nanoparticles, called filiform nanoparticles (12), having:
a length extending in a main direction of elongation of the filiform nanoparticles (12),
two dimensions, called orthogonal dimensions, extending in two transverse directions which are mutually orthogonal and orthogonal to said main direction of elongation of the filiform nanoparticles (12), said orthogonal dimensions being smaller than 500 nm,
said length extending in a main direction of elongation being larger than said orthogonal dimensions, and
two ratios, called aspect ratios, between said length and each of the two orthogonal dimensions, said aspect ratios being greater than 10,
wherein,
said filiform nanoparticles (12) are distributed in the volume of the solid dielectric matrix (11) in an amount by volume of less than 50%, and
the main directions of elongation of the filiform nanoparticles (12) of the inorganic filler distributed in the dielectric matrix (11) have a substantially isotropic distribution in the solid dielectric matrix (11).

7 more elements

A method for obtaining a composite solid material, called hybrid material, comprising:

preparing a dispersion of an inorganic filler comprising filiform nanoparticles (12) formed of an inorganic material selected from the group consisting of piezoelectric materials, pyroelectric materials, and piezoelectric and pyroelectric materials, said filiform nanoparticles (12) having:
a length extending in a main direction of elongation of the filiform nanoparticles (12),
two dimensions, called orthogonal dimensions, extending in two transverse directions which are mutually orthogonal and orthogonal to said main direction of elongation of the filiform nanoparticles (12), said orthogonal dimensions being smaller than 500 nm,
said length extending in a main direction of elongation being larger than said orthogonal dimensions, and
two ratios, called aspect ratios, between the length and each of the two orthogonal dimensions, said aspect ratios being greater than 10,
in a liquid precursor composition (2) of a solid dielectric matrix (11),
said preparing of said dispersion being carried out in such a manner as to obtain an amount by volume of filiform nanoparticles (12) in said hybrid material of less than 50%, and
said preparing of said dispersion being carried out in such a manner that the main directions of elongation of the filiform nanoparticles (12) of the inorganic filler distributed in the dielectric matrix (11) have a substantially isotropic distribution in the solid dielectric matrix (11).

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/514,461Filed 3 Dec 2010
Priority: FR 09 0599511 Dec 2009
Published: US 2012/0267563 A125 Oct 2012
Granted: 4 Nov 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification22 codes

C04B 35/62259
Based on oxide ceramics: fibres based on titanium oxide
C04B 35/6263
Wet mixtures: characterised by their solids loadings, i.e. the percentage of solids
H10N 15/00
Thermoelectric devices without a junction of dissimilar materials
H10N 15/15
Thermoelectric devices using thermal change of the dielectric constant, e.g. working above and below the Curie point: thermoelectric active materials