scholarly journals High-permittivity silicone dielectric elastomers compatible with ionic liquid-grafted chloropropyl-silicone oil

2021 ◽  
Author(s):  
Zhaoqing Kang ◽  
Liyun Yu ◽  
Yi Nie ◽  
Suojiang Zhang ◽  
Anne Ladegaard L. Skov
Keyword(s):  
Ionic Liquid ◽  
Silicone Oil ◽  
Dielectric Elastomers ◽  
High Permittivity

scholarly journals Compatibilization of porphyrins for use as high permittivity fillers in low voltage actuating silicone dielectric elastomers

RSC Advances ◽  
2020 ◽  
Vol 10 (31) ◽  
pp. 18477-18486 ◽  
Author(s):  
Cody B. Gale ◽  
Michael A. Brook ◽  
Anne Ladegaard Skov
Keyword(s):  
Low Voltage ◽  
Dielectric Elastomers ◽  
High Permittivity

Derivatization of the porphyrin TPMP improves its dispersion in silicone dielectric elastomers, resulting in materials capable of achieving high actuations at low voltages.

scholarly journals Synthesis of solvent-free processable and on-demand cross-linkable dielectric elastomers for actuators

2019 ◽  
Vol 7 (39) ◽  
pp. 12139-12150 ◽  
Author(s):  
Philip Caspari ◽  
Frank A. Nüesch ◽  
Dorina M. Opris
Keyword(s):  
Thin Films ◽  
Solvent Free ◽  
Dielectric Elastomers ◽  
High Permittivity ◽  
Electric Stimulus ◽  
On Demand ◽  
Solvent Free Synthesis

On-demand and solvent-free synthesis of high permittivity polysiloxane elastic thin films responsive to an electric stimulus is presented.

scholarly journals Improved Magnetorheological Properties by Using Ionic Liquid as Carrier Liquid of Magnetorheological Fluids

2021 ◽  
Vol 8 ◽  
Author(s):  
Yu Tong ◽  
Xiaoguang Li ◽  
Penghui Zhao ◽  
Xufeng Dong ◽  
Zhanjun Wu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Ionic Liquid ◽  
Silicone Oil ◽  
Magnetorheological Fluid ◽  
Magnetorheological Fluids ◽  
Carrier Liquid ◽  
Silicone Oils ◽  
Shear Yield ◽  
Mr Effect ◽  
Experimental Data Analysis

The interface between the particles and the carrier fluids has an important influence on the performance of magnetorheological fluid (MRF). In this study, ionic liquids and silicone oils with the same viscosity and different surface tensions were used as carrier fluids to prepare two different carbonyl iron powder (CIP) magnetorheological fluids. The rheological properties of the two magnetorheological fluids were evaluated by the MCR301 rotating rheometer. The experimental results indicate that ionic liquid-based MRF showed higher shear yield strength and more significant MR effect than silicone oil-based ones in higher magnetic field strength. A possible explanation was proposed and proved through experimental data analysis.

scholarly journals Self-Repairable, High Permittivity Dielectric Elastomers with Large Actuation Strains at Low Electric Fields

2015 ◽  
Vol 25 (16) ◽  
pp. 2467-2475 ◽  
Author(s):  
Simon J. Dünki ◽  
Yee Song Ko ◽  
Frank A. Nüesch ◽  
Dorina M. Opris
Keyword(s):  
Electric Fields ◽  
Dielectric Elastomers ◽  
High Permittivity

Effect of Different Electrode Materials on the Performance of Smart Composite Actuators Based on Dielectric Elastomers

2007 ◽  
Vol 334-335 ◽  
pp. 985-988 ◽  
Author(s):  
P. Khodaparast ◽  
S.R. Ghaffarian ◽  
M.R. Khosroshahi
Keyword(s):  
Electrode Materials ◽  
Silicone Oil ◽  
Large Strain ◽  
Mechanical Energy ◽  
Graphite Powder ◽  
Test Method ◽  
Dielectric Elastomers ◽  
Additional Stress ◽  
Good Efficiency ◽  
Conductive Silicone Rubber

Dielectric elastomers are a class of electro-active polymers (EAPs) which have great potentials to be used in smart composites. These materials with compliant electrodes are converters of electrical energy to mechanical energy in order to produce external load and strain with good efficiency. Electrode materials should typically have good compliancy so that undergo large strain alongside the film, without producing any additional stress and constraint for the actuator. In the present study, the effect of 4 different electrode materials (graphite filled silicone oil, silver filled grease, graphite powder and electrically conductive silicone rubber) on the performance of dielectric elastomer actuators has been studied. The principle of operation, the method of fabrication and test method of planar actuators are discussed. We have also studied the effects of different driving voltages and different prestrain values on the actuator response. Experimental results showed that electrical conductivity, material compliancy, and compatibility with substrate in the electrode materials are some of the important parameters affecting the actuator performance.

scholarly journals Highly Sensitive Flexible Pressure Sensors Enabled by Mixing of Silicone Elastomer With Ionic Liquid-Grafted Silicone Oil

2021 ◽  
Vol 8 ◽  
Author(s):  
Zhaoqing Kang ◽  
Yi Nie ◽  
Liyun Yu ◽  
Suojiang Zhang ◽  
Anne Ladegaard Skov
Keyword(s):  
Ionic Liquid ◽  
Dielectric Permittivity ◽  
Pressure Sensor ◽  
Silicone Oil ◽  
Electrical Response ◽  
Pressure Sensors ◽  
Silicone Elastomer ◽  
Relative Dielectric Permittivity ◽  
Highly Sensitive ◽  
Flexible Pressure Sensors

Developing highly sensitive flexible pressure sensors has become crucially urgent due to the increased societal demand for wearable electronic devices capable of monitoring various human motions. The sensitivity of such sensors has been shown to be significantly enhanced by increasing the relative dielectric permittivity of the dielectric layers used in device construction via compositing with immiscible ionic conductors. Unfortunately, however, the elastomers employed for this purpose possess inhomogeneous morphologies, and thus suffer from poor long-term durability and unstable electrical response. In this study, we developed a novel, flexible, and highly sensitive pressure sensor using an elastomeric dielectric layer with particularly high permittivity and homogeneity due to the addition of synthesized ionic liquid-grafted silicone oil (denoted LMS-EIL). LMS-EIL possesses both a very high relative dielectric permittivity (9.6 × 105 at 10−1 Hz) and excellent compatibility with silicone elastomers due to the covalently connected structure of conductive ionic liquid (IL) and chloropropyl silicone oil. A silicone elastomer with a relative permittivity of 22 at 10−1 Hz, Young’s modulus of 0.78 MPa, and excellent homogeneity was prepared by incorporating 10 phr (parts per hundreds rubber) of LMS-EIL into an elastomer matrix. The sensitivity of the pressure sensor produced using this optimized silicone elastomer was 0.51 kPa−1, which is 100 times higher than that of the pristine elastomer. In addition, a high durability illustrated by 100 loading–unloading cycles and a rapid response and recovery time of approximately 60 ms were achieved. The excellent performance of this novel pressure sensor suggests significant potential for use in human interfaces, soft robotics, and electronic skin applications.

Soft ionic liquid based resistive memory characteristics in a two terminal discrete polydimethylsiloxane cylindrical microchannel

2020 ◽  
Vol 8 (38) ◽  
pp. 13368-13374
Author(s):  
Muhammad Umair Khan ◽  
Gul Hassan ◽  
Jinho Bae
Keyword(s):  
Ionic Liquid ◽  
Acrylic Acid ◽  
Sodium Hydroxide ◽  
Sodium Salt ◽  
Resistive Memory ◽  
Cylindrical Microchannel ◽  
Memory Characteristics ◽  
Poly Acrylic Acid

This paper proposes a novel soft ionic liquid (IL) electrically functional device that displays resistive memory characteristics using poly(acrylic acid) partial sodium salt (PAA-Na+:H2O) solution gel and sodium hydroxide (NaOH) in a thin polydimethylsiloxane (PDMS) cylindrical microchannel.

Use of viscodissection and silicone oil in vitrectomy for severe diabetic retinopathy

2003 ◽  
Vol 18 (3) ◽  
pp. 121-126
Author(s):  
Grigorian R.A. ◽  
Castellarin A. ◽  
Bhagat N. ◽  
Del Priore ◽  
Von Hagen ◽  
...  
Keyword(s):  
Diabetic Retinopathy ◽  
Silicone Oil
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