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

A technology of thermoelectric materials and hybrid materials, applied in material selection for piezoelectric devices or electrostrictive devices, manufacturing/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, etc. direction, which can solve the problems of mechanical properties, mechanical properties, and the inability of the matrix to maintain the original ductility.

Inactive Publication Date: 2012-11-21
UNIV PAUL SABATIER TOULOUSE III
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These composite materials are able to achieve piezoelectric coefficient values ​​between 10-30pC / N, but do not allow the matrix to roughly maintain the original ductility
[0005] The problem is that high voltage and / or thermoelectric composite solid materials can be obtained - especially composite solid materials with piezoelectric and / or thermoelectric efficiency better than the piezoelectric and / or thermoelectric materials of the state of the art, but The mechanical properties of the composite solid material are reduced compared to the mechanical properties of a matrix comprising the composite solid material

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] Example 1: Preparation of barium titanate nanowires with high shape factor

[0123] Electrodeposit an aqueous solution of barium titanate in the pores of an alumina filter membrane (PAA, Porous Anodised Alumina, Whatmann, 6809-5022 or 6809-5002) to synthesize BaTiO 3 For nanowires, the aluminum oxide filter membrane has a thickness of 50 μm and a porosity of 200 nm. In the presence of 3.27 mL of ethylene glycol (Ref. 324558, Sigma-Aldrich, Lyon, France) and 2 L of water, 3 g of barium acetate (Ref. 255912, Sigma-Aldrich, Lyon, France) and 3.3 g of iso Titanium propoxide (Ref. 377996, Sigma-Aldrich, Lyon, France) was dissolved in 20.16 mL of glacial acetic acid (Ref. A9967, Sigma-Aldrich, Lyon, France), thereby forming a barium titanate sol. The final pH of the prepared barium titanate sol was 5. The filter membrane was positioned in the barium titanate sol such that one of its major surfaces came into sealing contact with the surface of the aluminum plate prior to sil...

Embodiment 2

[0126] Embodiment 2: the preparation of the barium titanate nanotube of high shape factor

[0127] Barium titanate BaTiO was prepared as described in Example 1 3Sol. The barium titanate sol was placed on one of the main surfaces of an alumina filter membrane (PAA) having a thickness of 50 μm and a porosity of 200 nm, thereby forming the inside of the pores of the filter membrane. Surface coating. The porous membrane was dried in air at 100 °C, and then nanotube BaTiO 3 The heat treatment step of annealing is performed at a temperature of about 600° C. in the ambient environment. The alkaline reaction of the porous membrane was initiated as described in Example 1, followed by washing to form BaTiO in an organic solvent such as N,N-dimethylacetamide 3 suspension of nanotubes.

Embodiment 3

[0128] Example 3: Preparation of BaTiO dispersed in a polyamide thermoplastic dielectric matrix 11 3 Piezoelectric and / or thermoelectric hybrid materials made of nanowires

[0129] 250 mg of BaTiO with a shape factor of 25 as described in Example 1 3 The nanowires were dispersed in 20 mL of N,N-dimethylacetamide. The dispersion is carried out in an ultrasonic bath with a frequency of about 20kHz, and the dispersion power is about 500W. On the other hand, 250 mg of polyamide 11 (PA11, Rilsan polyamide 11, ARKEMA, USA) was dissolved in 20 mL of N,N-dimethylacetamide. Mix well by sonicating. After evaporating N,N-dimethylacetamide and thermoforming, a hybrid composite film with a thickness of 150 μm was obtained, in which linear nanoparticles BaTiO 3 The loading in the polyamide dielectric matrix 11 is 12% by volume.

[0130] In a variant, the hybrid composite film is placed in sheet form on the surface of the substrate in ambient conditions or is formed by heat treatment on...

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Abstract

The invention relates to a piezoelectric and / or pyroelectric composite solid material, referred to as a hybrid material, including: a solid dielectric matrix (11), a filler of at least one inorganic piezoelectric and / or pyroelectric material, characterised in that said filler includes filiform nanoparticles (12) distributed throughout the volume of the solid dielectric matrix (11) with an amount by volume of less than 50%, and in 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). The invention also relates to a method for manufacturing and using such a hybrid material for the production of structural parts and supported films deposited on the surface of such a substrate for the purpose of: 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.

Description

technical field [0001] The present invention relates to piezoelectric and / or thermoelectric composite solid materials and methods for obtaining and using said materials. Background technique [0002] The invention applies to acoustic sensors, piezoelectric resonators, pressure sensors and / or acceleration sensors, actuators (in particular direct actuators capable of generating displacement strokes between 0.1 and 100 μm, especially for atomic force microscopes and tunneling microscopes ), piezoelectric motors, piezoelectric generators and piezoelectric transformers, pyroelectric sensors, sound-insulating materials (especially sound-absorbing piezoelectric materials), high-permittivity materials (especially for electronics and electrotechnical applications), and piezoelectric Electro-actuated materials. [0003] It has been proposed to incorporate ferroelectric materials of PZT (lead-titanium-zirconium) type micron or nanoparticulate materials in polyepoxy matrix, especially ...

Claims

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Application Information

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IPC IPC(8): H01L41/18H01L41/22H01L37/00
CPCB82Y30/00C04B2235/6028C04B2235/526C04B2235/3215H01L37/00C04B35/6263C04B2235/5284C04B2235/5296C04B2235/5264H01L41/37H01L37/025C04B35/62259H01L41/183Y10T428/31692Y10S977/783Y10S977/812Y10S977/837H10N15/15H10N30/852H10N30/092H10N15/00
Inventor J-F·卡普萨尔C·戴维E·当特拉C·拉卡巴纳
Owner UNIV PAUL SABATIER TOULOUSE III
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