Piezoelectric Nanoparticle-Polymer Composite Foam
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Solution Overview
Problem
Current piezoelectric materials are heavy, brittle, and difficult to process into arbitrary shapes, limiting their mechanical flexibility and applicability in advanced sensors, actuators, and energy scavenging devices.
Innovation Solution
Development of stretchable nanoparticle-polymer composite structures with tunable porosity and compositional variations, incorporating piezoelectric nanoparticles and graphitic carbons, which can be fabricated using sugar-templating methods to create lightweight, flexible foams with high piezoelectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional piezoelectric materials are used, then piezoelectric properties are achieved, but the materials are heavy and brittle
Solution Approach 1:
The patent uses composite materials by combining piezoelectric nanoparticles (such as PZT, BTO, or ZnO) with a flexible polymer matrix (such as PDMS or polyurethane). This composite structure provides the desired piezoelectric properties while reducing weight and improving flexibility compared to traditional bulk piezoelectric ceramics.
Solution Approach 2:
The patent employs porous foam structures with controlled porosity (up to 73%) to reduce the overall density and weight of the piezoelectric material. The porous architecture is achieved through sugar-templating methods where sugar particles are removed after curing, leaving void spaces that reduce weight while maintaining structural integrity and piezoelectric performance.
2Reliability
If traditional piezoelectric materials are used, then piezoelectric properties are achieved, but the materials are difficult to process into arbitrary shapes
Solution Approach 1:
The patent changes the physical state and processing parameters by using a curable liquid polymer that can be molded in uncured state into arbitrary shapes, then cured to fix the desired geometry. This allows easy fabrication of complex 3D structures, flexible foams, and conformal coatings that would be difficult to achieve with traditional rigid piezoelectric ceramics.
Solution Approach 2:
The patent uses sugar particles as an intermediary templating agent during fabrication. The sugar particles are mixed into the uncured polymer composite, shaped, and then removed after curing to create porous structures with controlled geometry. This intermediary approach enables precise control over pore size, shape, and distribution while maintaining ease of manufacturing.
3Weight of moving object
If porosity is increased to reduce weight, then mechanical flexibility improves, but structural integrity may deteriorate
Solution Approach 1:
The patent uses composite materials with a flexible polymer matrix that provides structural support to the porous framework. The polymer binder holds the piezoelectric nanoparticles together and maintains structural integrity even at high porosity levels (up to 73%), preventing collapse of the porous structure while keeping the material lightweight and flexible.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting materials exhibit enhanced mechanical flexibility, high piezoelectric coefficients, and isotropic mechanical integrity, enabling applications in compact ultrasonic imaging, acoustic sensors, and energy scavenging while being cost-effective and easily processable into various shapes.
Implementation Method 1
piezoelectric nanoparticles; The porous structure can receive an electric field that is greater than coercive field of the piezoelectric nanoparticles to render the porous structure piezelectronically active
Data Source
AI summary
Methods, systems, and devices are disclosed for implementing a stretchable nanoparticle-polymer composite foams that exhibit piezoelectric properties. In one aspect, a nanoparticle-polymer composite structure includes a curable liquid polymer; piezoelectric nanoparticles; and graphitic carbons.