Effect of Filler Amount on Relative Permittivity and Deformation Rate of TiO<sub>2</sub>/Silicone Elastomer Composite

Fujihara, Ryohei; Kurimoto, Muneaki; Naya, K.; Kato, Tatsuya; Imanaka, Makoto; Sugimoto, Shigeki; Suzuoki, Yasuo

doi:10.1109/ceidp47102.2019.9009746

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…Fujihara et al (2019) demonstrated a reduction in permittivity from roughly 6.5 to 4.25 for 10 vol % TiO 2 in silicone. 62 Huang and Schadler (2017) showed a permittivity reduction from roughly 8 to 4.5 in carbon blackfilled rubber. 63 The permittivity reduction in these composites is ascribed to reorientation of anisotropic fillers and the breaking of the conductive network, respectively, not directly to a change in polarizability of the polymer.…”

Section: Liquid Metal Composite Pressure Sensingmentioning

confidence: 99%

“…There is little work focused on the effect of deformation on filled polymer composites. Fujihara et al (2019) demonstrated a reduction in permittivity from roughly 6.5 to 4.25 for 10 vol % TiO 2 in silicone . Huang and Schadler (2017) showed a permittivity reduction from roughly 8 to 4.5 in carbon black-filled rubber .…”

Section: Liquid Metal Composite Pressure Sensingmentioning

confidence: 99%

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Multimodal Deformation of Liquid Metal Multimaterial Composites as Stretchable, Dielectric Materials for Capacitive Pressure Sensing

Bury

Koh

2022

ACS Appl. Mater. Interfaces

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Traditional electronic devices are composed of rigid materials and components that tend to be unsuitable for soft robotic and stretchable electronic applications, such as wearable or continuous pressure sensing. However, deformable materials have the potential to improve upon traditional devices through enhanced sensitivity and responsiveness, better conformability and biocompatibility at the human–machine interface, and greater durability. This work presents deformable composite materials composed of the gallium–indium–tin alloy galinstan (GaInSn) that combines the conductivity of a metal and the intrinsic deformability of a liquid. Dispersing galinstan in an elastomer allows for the formation of deformable dielectric materials that have tunable mechanical and electrical behavior, for example, modulus and relative permittivity. Galinstan composites have been shown previously to have a minimal modulus impact on the elastomer but concurrently achieve impressive dielectric performance. However, galinstan dispersions can be costly and face challenges of mechanical and electrical reliability. Thereby, this work investigates multimaterial composites composed of galinstan and a rigid filler, either iron or barium titanate, with respect to morphology, mechanical behavior, dielectric behavior, and pressure sensing performance for the purpose of achieving a balance between a low modulus and superior electrical performance. By combining galinstan and rigid fillers, it was found that the mechanical and electrical properties, such as modulus, permittivity, loss behavior, sensitivity, and linearity of the multimaterial composites can be improved by tuning filler formulation. This suggests that these dielectric materials can be used for sensing applications that can be precisely calibrated to specific material properties and the needs of the user. These deformable multimaterial composites, found to be stretchable and highly responsive in sensing applications, will expand the current mechanical abilities of deformable dielectric materials to improve soft robotic and stretchable electronic devices.

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Section: Liquid Metal Composite Pressure Sensingmentioning

confidence: 99%

Section: Liquid Metal Composite Pressure Sensingmentioning

confidence: 99%

Multimodal Deformation of Liquid Metal Multimaterial Composites as Stretchable, Dielectric Materials for Capacitive Pressure Sensing

Bury

Koh

2022

ACS Appl. Mater. Interfaces

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“…The volume of the DE sample was assumed to remain constant before and after stretching, and the width of stretched DE is the same as that in the released state, so the thickness and the area of stretched DE sample are d1 = d2 / λ and S1 = λ • S2, respectively. Based on the DE power generation principle in figure 1, the U a can be calculated by equation 2 6 .…”

Section: Power Generation Output Simulationmentioning

confidence: 99%

Influence of stretch-dependent permittivity on power generation output of dielectric elastomer

Dejie,

Tagawa,

Zhu

et al. 2024

Electroactive Polymer Actuators and Devices (EAPAD) XXVI

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Dielectric elastomer (DE) energy harvesting device can be used as power source for battery-free or battery-maintenancefree wireless sensors, owing to the lightweight, high energy density and excellent deformability of DE. Previous research has shown that the power generation output of a DE device can be enhanced by increasing the permittivity of DE. However, the permittivity decreases with the mechanical stretching deformation. In this work, we investigated the influence of the stretch-dependent permittivity on power generation output of DE device. As a DE with increased permittivity, a composite material consisting of silicone elastomer base and rod-like titanium dioxide fillers (RTC) was used. Pure-silicone elastomer-based DE (PSR) was also used for comparison. The permittivity of the DE was measured under different stretching states and the lumped parameter model proposed by Schlögl et al. was used to fit the measurement results. Then the theoretical power generation output of DE device was simulated based on the fitting results. The results showed that the permittivities of RTC and PSR decreased by 28% and 17%, respectively when the DEs were uniaxially stretched to a stretch ratio of 5. The simulated power generation outputs of DE devices with RTC and PSR are similar, due to the large decrease in permittivity of RTC. The conclusion is that it is essential for enhancing power generation output of DE device not only to increase permittivity but also to weaken the stretch dependence on the permittivity because the permittivity decreases with stretching.

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Effect of Filler Amount on Relative Permittivity and Deformation Rate of TiO₂/Silicone Elastomer Composite

Cited by 2 publications

References 8 publications

Multimodal Deformation of Liquid Metal Multimaterial Composites as Stretchable, Dielectric Materials for Capacitive Pressure Sensing

Multimodal Deformation of Liquid Metal Multimaterial Composites as Stretchable, Dielectric Materials for Capacitive Pressure Sensing

Influence of stretch-dependent permittivity on power generation output of dielectric elastomer

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Effect of Filler Amount on Relative Permittivity and Deformation Rate of TiO2/Silicone Elastomer Composite

Cited by 2 publications

References 8 publications

Multimodal Deformation of Liquid Metal Multimaterial Composites as Stretchable, Dielectric Materials for Capacitive Pressure Sensing

Multimodal Deformation of Liquid Metal Multimaterial Composites as Stretchable, Dielectric Materials for Capacitive Pressure Sensing

Influence of stretch-dependent permittivity on power generation output of dielectric elastomer

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Effect of Filler Amount on Relative Permittivity and Deformation Rate of TiO₂/Silicone Elastomer Composite