Cellular polymers can be internally charged by “microstorms”(silent or partial discharges)
within the voids of the polymer foam. The resulting material, which carries positive and …

The review begins with a very brief history of electrets and of piezo and pyroelectricity in
nonuniform space charge electrets. The development of cellular propylene as an electret …

Permanently charged films with a cellular or porous structure represent a new family of
polymer electrets. These materials show piezoelectric properties with high piezoelectric …

Electrets are a class of dielectric materials with quasi-permanent electric charges or
molecular dipoles and the ability to generate electrostatic charge in response to external …

In the emerging field of human-machine interaction, intelligent gesture recognition
techniques have great application prospects. The traditional use of rigid and over-sized …

Charged closed-cell microporous polypropylene foams are shown to exhibit piezoelectric
resonance modes in the dielectric function, coupled with a large anisotropy in the …

Acoustically driven antennas operating at resonant wavelengths up to 10 5 times smaller
than electrical antennas offer great potential for portable, low power communication systems …

Cellular space-charge electrets have recently emerged as a new class of materials for
electromechanical devices, offering chances for a wide range of applications and …

Piezoelectric polymers are widely used in sensor and actuator applications. Compared to
ceramic materials, they have the advantage of mechanical flexibility and an acoustic …

Several layers of polytetrafluoroethylene and fluoroethylenepropylene films are fused such
that small interfacial gas voids are formed between the layers. After proper charging and …