Effect of strain rate and filler size on mechanical behavior of a Cu filled elastomer based composite

Oberoi, Sudhi; Sonawane, Dipali; Kumar, Praveen

doi:10.1016/j.compscitech.2016.03.006

Cited by 13 publications

(7 citation statements)

References 33 publications

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“…When fixing maximum strain, the strain rate applied for 10 Hz is 1000 times higher than that of 0.01 Hz, which results in the stress applied on the wrist band under high frequency being considerably higher than that under low frequency. The change in the mechanical response upon increasing the strain rate is attributed to the reduction in the molecular mobility of polymer chains, which increases its inherent stiffness. ,−, Furthermore, to demonstrate the reliability of the wrist band, 1000 compression cycles under 20% strain were performed. After 1000 cycles, the RCR responses remained stable and reversible, indicating excellent durability of the wrist band fabricated (Figure D).…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Wearable Device Based on Flexible and Conductive Carbon Sponge/Polydimethylsiloxane Composite

Li¹,

Zhu²,

Yu³

et al. 2016

ACS Appl. Mater. Interfaces

191

105

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Wearable devices that can be used to monitor personal health, track human motions, and provide thermotherapy, etc., are highly desired in personalized healthcare. In this work, a multifunctional wearable "wrist band" which works as both heater for thermotherapy and sensor for personal health and motion monitoring is fabricated from a flexible and conductive carbon sponge/polydimethylsiloxane (CS/PDMS) composite. The key functional material of the wrist band, namely, the conductive CS, is synthesized from waste paper by a freeze-drying and high-temperature pyrolysis process. When the wrist band works as a heater under 15 V, a stable temperature difference of 20 °C is achieved between the wrist band and the ambient. When the wrist band serves as a wearable strain sensor, the wrist band exhibits fast and repeatable response and excellent durability within the strain range of 0-20% and the working frequency of 0.01-10 Hz. Finally, the typical applications of the multifunctional wearable wrist band, as a heater for thermotherapy and a sensor for blood pulse, breathe, and walk monitoring, are demonstrated. Due to its low cost, high flexibility, moderate conductivity, and excellent strain sensibility, the as-prepared wearable device based on the CS/PDMS composite is promising to be applied for the provision of personal healthcare.

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Section: Resultsmentioning

confidence: 99%

Multifunctional Wearable Device Based on Flexible and Conductive Carbon Sponge/Polydimethylsiloxane Composite

Li¹,

Zhu²,

Yu³

et al. 2016

ACS Appl. Mater. Interfaces

191

105

View full text Add to dashboard Cite

show abstract

“…Within one cycle, the strain is applied to 10% in 0.5 s and held for 4.5 s, then released to 0% within 0.5 s, and held again for another 4.5 s. As shown in Figure c, the RCR responsive curve shape is similar to that of the strain curve. At the same time, a slow RCR recovery phenomenon is observed at the holding period, which is attributed to the internal stress relaxation behavior of silicone …”

Section: Resultsmentioning

confidence: 95%

High-Performance Fiber-Film Hybrid-Structured Wearable Strain Sensor from a Highly Robust and Conductive Carbonized Bamboo Aerogel

Zhu

Wang

et al. 2020

ACS Appl. Bio Mater.

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Bamboo, one of the most abundant biomaterials, has been used as a building material since ancient times; however, its application in functional materials has been rarely explored. Herein, a highly robust and conductive carbonized bamboo aerogel (CBA) is obtained from the natural bamboo through a simple three-step process of pulp oxidization, freeze-drying, and carbonization. The CBA obtained shows not only a low density of 0.02 g/cm3 but also a high conductivity of 6.42 S/m and remarkable elasticity with a maximum recoverable compressive strain of 60% due to its unique three-dimensional (3D) network randomly stacked with the hybrid structure of carbonized bamboo fibers and films. After encapsulation with silicone resin, the CBA/silicone composite prepared exhibits excellent flexibility and stretchability with a low Young’s modulus (0.09 MPa) and a large failure strain (275%). Importantly, the CBA/silicone composite also offers remarkable strain-sensing performance with a maximum gauge factor of 30.6, a short responsive time of 50 ms, and a stable response to cyclic loading over 1000 cycles, which is comparable to those of the piezoresistive composites based on expensive nanomaterials. Moreover, the CBA/silicone composite demonstrates the capability as a wearable strain sensor for human motion recognition comprising finger bending, breathing, and throat movement. Considering the green and sustainable nature of bamboo as a raw material, combined with the excellent piezoresistive performance, low production cost, and simple preparation process, the flexible strain sensors with CBA/silicone composite as a sensing element are promising in wearable electronic devices, personalized healthcare, and artificial intelligence systems.

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“…As shown in Figure d, an RCC of 6.5 is observed at the frequency of 0.1 Hz, and a further increase of the loading frequency up to 10 Hz results in the decrease of RCC down to 2.9, similar to the magnetism sensing (Figure e). The reason for this tendency is the hardening effect due to the modulus increase of carbon aerogel upon increasing the frequency of external loading. − In addition, the reliability of the CA/IR sensor was evaluated by applying 5000 cycles of compressive pressure. As illustrated in Figure f, the base current of the pressure sensor is almost constant under cyclic loading, although a small drift in the electrical conductivity at the loading state is observed possibly due to the sliding of the pressure sensor from the clamps at such a long period of pressure, suggesting the excellent reliability of the pressure sensor.…”

Section: Resultsmentioning

confidence: 99%

Dual-Mode Carbon Aerogel/Iron Rubber Sensor

Huang

Tan

Li³

et al. 2020

ACS Appl. Mater. Interfaces

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Nowadays, the integration of easy production, simple structure, high sensitivity, and multifunctionality is the developing tendency for flexible sensors. Herein we report a facile manufacture of a highly flexible, sensitive, and multifunctional dual-mode sensor with an ultrasimple structure by directly attaching magnetic iron rubber (IR) onto the surface of carbon aerogel (CA) derived from melamine foam. The dual-mode CA/IR sensor exhibits high sensitivities of 5.6 kPa–1 and 1.6·10–3 Oe–1, respectively, toward pressure and magnetic field in a wide frequency ranging from 0.1 to 10 Hz, which are higher than those of the existing flexible pressure/magnetism sensors. The multifunctionality of the dual-mode CA/IR sensor is demonstrated by monitoring blood pulse, human breath, balloon volume, and thoracic volume via pressure and magnetism sensing or their combination. Due to its simple structure and high sensitivities, the dual-mode sensor is employed as the building block to create a direction-recognizable sensor for identifying the directions of pressure and magnetic field for the awareness of surrounding barriers that are of practical importance in sophisticated situations such as autonomous artificial intelligence, autodriving and robotics, and so on.

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Effect of strain rate and filler size on mechanical behavior of a Cu filled elastomer based composite

Cited by 13 publications

References 33 publications

Multifunctional Wearable Device Based on Flexible and Conductive Carbon Sponge/Polydimethylsiloxane Composite

Multifunctional Wearable Device Based on Flexible and Conductive Carbon Sponge/Polydimethylsiloxane Composite

High-Performance Fiber-Film Hybrid-Structured Wearable Strain Sensor from a Highly Robust and Conductive Carbonized Bamboo Aerogel

Dual-Mode Carbon Aerogel/Iron Rubber Sensor

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