Addressable, Stretchable Heating Silicone Sheets

Bilodeau, R. Adam; Yuen, Michelle C.; Kramer‐Bottiglio, Rebecca

doi:10.1002/admt.201900276

Cited by 21 publications

(12 citation statements)

References 52 publications

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“…[ 9 ] The Poisson's ratio of particle filled composites can generally be reduced by increasing the filler content, [ 19,20,22,26 ] but there may be practical limits since we observed embrittlement of the conductive composite in previous work that used a high filler content (>15 wt%). [ 35 ]…”

Section: Resultsmentioning

confidence: 99%

Nonlinear Poisson's Ratio for Modeling Hyperelastic Capacitive Sensors

Porte¹,

Kramer‐Bottiglio²

2021

Adv Materials Technologies

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Highly stretchable capacitive sensors are of great interest for soft robotic control due to their ability to measure relatively large strains. These sensors are often multilayered materials, with one or more of the layers made from silicones filled with functional particles. However, the models used to describe the material behavior do not always account for the hyperelastic nature of the silicones, the altered material properties due to fillers, and potential anisotropy due to the layered structure. Large errors arise when predicting capacitance using widespread assumptions of linear elastic mechanics and isotropic material properties. This study demonstrates how these modeling assumptions are inadequate for predicting sensor performance, and compares alternative models based on empirical material mechanics. The Poisson's ratio of multi‐layered hyperelastic capacitors is measured in both the width and thickness directions by imaging the sensor dimensions during strain. The results indicate that the sensors are anisotropic and have a strain‐dependent Poisson's ratio, demonstrating the validity of the proposed model. Considering these properties in capacitance models will lead to an improved ability to predict sensor performance, especially at high strains.

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Section: Resultsmentioning

confidence: 99%

Nonlinear Poisson's Ratio for Modeling Hyperelastic Capacitive Sensors

Porte¹,

Kramer‐Bottiglio²

2021

Adv Materials Technologies

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“…[65] To solve the spatial resolution of LM wire and realize more complex functions like local region stiffness adjusting, copper or nickel-chromium wires were introduced and diversified. [66] LMPA-based stiffness tunable material faces the challenge of limited cooling speed, which can be partially solved via active cooling like air or water convection, [67] vortex tubes refrigeration, [68] and flexible thermoelectric cooling (Figure 3B) [69] in heat convection layer. Generally, the change of stiffness is just a support to realize specific functions.…”

Section: Multilayered Combinationmentioning

confidence: 99%

Low Melting Point Alloys Enabled Stiffness Tunable Advanced Materials

Hao

Gao

et al. 2022

Adv Funct Materials

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Stiffness tunable advanced materials have demonstrated their superiority and versatility in diverse areas, while the global pursuit of reversible, intelligent, and fast response for stiffness regulation is growing radically, leaving great challenges for traditional materials. As newly emerging functional metal material, the low melting point alloys (LMPAs) have shown encouraging potential in developing various stiffness regulation strategies owing to their excellent physicochemical and mechanical properties. This article is dedicated to presenting a comprehensive review of the LMPA‐enabled stiffness tunable materials from the aspects of material system, regulation principle and method, capability enabling mechanisms, and application scenarios. First, according to the structural differences, three kinds of LMPA‐enabled stiffness tunable material systems are evaluated. Then, the regulation strategies are elaborated from the fundamental LMPA modifications to dynamical external field controls, and the mainstream stiffness regulation modes are also combed out. Following that, the diversified applications of LMPA enabled stiffness tunable materials are systematically summarized and discussed. Finally, a perspective interpretation of the potentials and challenges of LMPA‐enabled stiffness tunable materials is provided. This article is expected to be important for guiding the future design of smart materials, functional entities, transformable robots, etc.

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“…The limitation of this strategy is that the electrical resistance of this heater will increase rapidly under stretching conditions due to the slippage of the nano-fibers, which will lead to the degrading performance of the heater and the mismatch between the temperature distribution and the design. Another approach is to encapsulate the patterned periodic metal network or liquid metal micro-channel into elastic substrates as stretchable electrodes [ 23 , 24 , 25 ]. The electrical resistance of this flexible electrode will not drift obviously due to flexible deformation.…”

Section: Introductionmentioning

confidence: 99%

An Analytic Orthotropic Heat Conduction Model for the Stretchable Network Heaters

Shi

Nan

et al. 2022

Micromachines

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Compared with other physiotherapy devices, epidermal electronic systems (EES) used in medical applications such as hyperthermia have obvious advantages of conformal attachment, lightness and high efficiency. The stretchable flexible electrode is an indispensable component. The structurally designed flexible inorganic stretchable electrode has the advantage of stable electrical properties under tensile deformation and has received enough attention. However, the space between the patterned electrodes introduced to ensure the tensile properties will inevitably lead to the uneven temperature distribution of the thermotherapy electrodes and degrade the effect of thermotherapy. It is of great practical value to study the temperature uniformity of the stretchable patterned electrode. In order to improve the uniformity of temperature distribution in the heat transfer system with stretchable electrodes, a temperature distribution manipulation strategy for orthotropic substrates is proposed in this paper. A theoretical model of the orthotropic heat transfer system based on the horseshoe-shaped mesh electrode is established. Combined with finite element analysis, the effect of the orthotropic substrate on the uniformity of temperature distribution in three types of heat source heat transfer systems is studied based on this model. The influence of the thermal conductivity ratio in different directions on the temperature distribution is studied parametrically, which will help to guide the design and fabrication of the stretchable electrode that can produce a uniform temperature distribution.

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Addressable, Stretchable Heating Silicone Sheets

Cited by 21 publications

References 52 publications

Nonlinear Poisson's Ratio for Modeling Hyperelastic Capacitive Sensors

Nonlinear Poisson's Ratio for Modeling Hyperelastic Capacitive Sensors

Low Melting Point Alloys Enabled Stiffness Tunable Advanced Materials

An Analytic Orthotropic Heat Conduction Model for the Stretchable Network Heaters

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