Temperature dependence of the dielectric constant of acrylic dielectric elastomer

Barium titanate (BT) particles, BT-KH570 particles, and polar plasticizer tri-n-butyl phosphate (TBP) were added into BIIR matrix to form a dielectric elastomer composite, which had a high dielectric constant, good mechanical properties, and large actuated strain.

Download Full-text

Properties of a Dielectric Elastomer Actuator Modified by Dispersion of Functionalised Carbon Nanotubes

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.79.41 ◽

2012 ◽

Vol 79 ◽

pp. 41-46 ◽

Cited By ~ 1

Author(s):

Fabia Galantini ◽

Sabrina Bianchi ◽

Valter Castelvetro ◽

Irene Anguillesi ◽

Giuseppe Gallone

Keyword(s):

Carbon Nanotubes ◽

Dielectric Constant ◽

Mechanical Performance ◽

Broad Class ◽

Dielectric Elastomer ◽

Low Dielectric ◽

Dielectric Elastomer Actuators ◽

Electromechanical Transduction ◽

The Matrix ◽

Simple Matrix

Among the broad class of electro-active polymers, dielectric elastomer actuators represent a rapidly growing technology for electromechanical transduction. In order to further develop this applied science, the high driving voltages currently needed must be reduced. For this purpose, one of the most promising and adopted approach is to increase the dielectric constant while maintaining both low dielectric losses and high mechanical compliance. In this work, a dielectric elastomer was prepared by dispersing functionalised carbon nanotubes into a polyurethane matrix and the effects of filler dispersion into the matrix were studied in terms of dielectric, mechanical and electro-mechanical performance. An interesting increment of the dielectric constant was observed throughout the collected spectrum while the loss factor remained almost unchanged with respect to the simple matrix, indicating that conductive percolation paths did not arise in such a system. Consequences of the chemical functionalisation of carbon nanotubes with respect to the use of unmodified filler were also studied and discussed along with rising benefits and drawbacks for the whole composite material.

Download Full-text

Parametric Models of Ultrasonic Piezoelectric Transducers over a Wide Temperature Range

Additional Conferences (Device Packaging HiTEC HiTEN & CICMT) ◽

10.4071/hiten-session7-paper7_6 ◽

2015 ◽

Vol 2015 (HiTEN) ◽

pp. 000266-000272 ◽

Cited By ~ 1

Author(s):

Steven A. Morris ◽

Jeremy Townsend

Keyword(s):

Dielectric Constant ◽

Temperature Dependence ◽

Coupling Coefficient ◽

Thin Disk ◽

Piezoelectric Transducers ◽

Parametric Models ◽

Model Parameters ◽

Linear Temperature Dependence ◽

Linear Temperature ◽

Wide Range

Piezoelectric ultrasonic transducers are used extensively in well logging and logging-while-drilling applications for pulse-echo operation. We present a method of modeling the operation of ultrasonic thin-disk piezoelectric transducers over a wide range of temperatures. The model is based on using Redwood's version of Mason's model of thin-disk transducers. Laboratory measurements in the oven of non-backed transducers in air are used to extract the Mason model parameters as a function of temperature. Derived parameters are frequency-thickness constant, dielectric constant, and thickness mode coupling coefficient. A fourth parameter, bulk density, is measured independently and assumed constant over temperature. Temperature dependence of frequency thickness constant and coupling coefficient are modeled as linear temperature coefficients. Temperature dependence of the dielectric constant must be specified as a table because of the non-linear temperature dependence of that parameter.

Download Full-text

A supramolecular silicone dielectric elastomer with a high dielectric constant and fast and highly efficient self-healing under mild conditions

Journal of Materials Chemistry A ◽

10.1039/d0ta06577c ◽

2020 ◽

Vol 8 (44) ◽

pp. 23330-23343

Author(s):

Haibin Sun ◽

Xueying Liu ◽

Suting Liu ◽

Bing Yu ◽

Nanying Ning ◽

...

Keyword(s):

Dielectric Constant ◽

Hydrogen Bonds ◽

High Dielectric Constant ◽

Dielectric Elastomer ◽

Supramolecular Network ◽

Self Healing ◽

Mild Conditions ◽

Highly Efficient ◽

Coordination Bonds ◽

High Dielectric

A silicone dielectric elastomer with simultaneous high dielectric constant, fast and efficient self-healing ability at mild conditions was prepared by constructing supramolecular network assembled by coordination bonds and hydrogen bonds.

Download Full-text

Size and Temperature Dependence of Dielectric Constant of Ultrafine PbTiO 3 Particles

Chinese Physics Letters ◽

10.1088/0256-307x/11/8/014 ◽

1994 ◽

Vol 11 (8) ◽

pp. 514-517 ◽

Cited By ~ 9

Author(s):

Baodong Qu ◽

Bin Jiang ◽

Yuguo Wang ◽

Peilin Zhang ◽

Weilie Zhong

Keyword(s):

Dielectric Constant ◽

Temperature Dependence

Download Full-text

Temperature dependence of the penetration depth and effective dielectric constant measured by YBa2Cu3O7−δ microstrip ring resonators

Physica C Superconductivity ◽

10.1016/s0921-4534(00)01622-1 ◽

2001 ◽

Vol 351 (2) ◽

pp. 97-102 ◽

Cited By ~ 6

Author(s):

H.K. Zeng ◽

J.Y. Juang ◽

J.Y. Lin ◽

K.H. Wu ◽

T.M. Uen ◽

...

Keyword(s):

Dielectric Constant ◽

Temperature Dependence ◽

Penetration Depth ◽

Ring Resonators ◽

Effective Dielectric Constant ◽

Microstrip Ring

Download Full-text

Effect of Diatomaceous Biosilica and Talc on the Properties of Dielectric Elastomer Based Composites

Energies ◽

10.3390/en13215828 ◽

2020 ◽

Vol 13 (21) ◽

pp. 5828

Author(s):

Ewa Olewnik-Kruszkowska ◽

Weronika Brzozowska ◽

Arkadiusz Adamczyk ◽

Magdalena Gierszewska ◽

Izabela Wojtczak ◽

...

Keyword(s):

Mechanical Properties ◽

Dielectric Constant ◽

Dielectric Properties ◽

Environmentally Friendly ◽

Polymeric Materials ◽

Dielectric Elastomer ◽

Thermal And Mechanical Properties ◽

Valuable Source ◽

Natural Fillers

Currently, scientists are still looking for new polymeric materials characterized by improved mechanical, thermal as well as dielectric properties. Moreover, it should be stressed that new composites should be environmentally friendly. For this reason, the aim of this work is to establish the influence of natural fillers in the form of diatomaceous biosilica (B) and talc (T) on the properties of dielectric elastomer (DE)-based composites. The dielectric elastomer-based materials have been tested taking into account their morphology, thermal and mechanical properties. Moreover, the dielectric constant of the obtained materials was evaluated. Obtained results revealed that the presence of both diatomaceous biosilica and talc significantly increases dielectric properties while having no significant effect on the mechanical properties of the obtained composites. It should be stressed that the performed analyses constitute a valuable source of knowledge on the effective modification of the thermal and dielectric properties of newly obtained materials.

Download Full-text