Ultra-stretchable MWCNT–Ecoflex piezoresistive sensors for human motion detection applications

Mai, Huy; Mutlu, Rahim; Tawk, Charbel; Alici, Gürsel; Sencadas, Vítor

doi:10.1016/j.compscitech.2019.02.001

Cited by 83 publications

(46 citation statements)

References 27 publications

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“…The soft silicone-based elastomers, Ecoflex, and their composites are attractive in a number of applications such as skin-mountable strain sensors, wearable energy devices, and displays [ 26 , 27 , 28 , 29 ], by virtue of their mechanical properties. The excellent mechanical properties of Ecoflex make it a promising candidate material for human implants.…”

Section: Introductionmentioning

confidence: 99%

3D Printed Silicone Meniscus Implants: Influence of the 3D Printing Process on Properties of Silicone Implants

et al. 2020

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Osteoarthritis of the knee with meniscal pathologies is a severe meniscal pathology suffered by the aging population worldwide. However, conventional meniscal substitutes are not 3D-printable and lack the customizability of 3D printed implants and are not mechanically robust enough for human implantation. Similarly, 3D printed hydrogel scaffolds suffer from drawbacks of being mechanically weak and as a result patients are unable to execute immediate post-surgical weight-bearing ambulation and rehabilitation. To solve this problem, we have developed a 3D silicone meniscus implant which is (1) cytocompatible, (2) resistant to cyclic loading and mechanically similar to native meniscus, and (3) directly 3D printable. The main focus of this study is to determine whether the purity, composition, structure, dimensions and mechanical properties of silicone implants are affected by the use of a custom-made in-house 3D-printer. We have used the phosphate buffer saline (PBS) absorption test, Fourier transform infrared (FTIR) spectroscopy, surface profilometry, thermo-gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) to effectively assess and compare material properties between molded and 3D printed silicone samples.

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Section: Introductionmentioning

confidence: 99%

3D Printed Silicone Meniscus Implants: Influence of the 3D Printing Process on Properties of Silicone Implants

et al. 2020

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“…Skininterfaced systems with integrated immunoassays for sweat cortisol, fluorescent assays for glucose and ascorbic acid (vitamin C), and with electrochemical sensors, support an important range of capabilities for analysis of sweat biomarkers and sweat dynamics related to stress. These multimodal features in sensing exploit ruggedized microfluidic structures formed using a highmodulus (∼1 GPa), ultraviolet (UV) curable polyurethane (NOA81) embedded in a low-modulus (∼30 kPa; Ecoflex; Smooth-On) silicone polymer matrix (28,29). Fig.…”

Section: Soft Skin-interfaced Skeletal Microfluidic Systems With Latmentioning

confidence: 99%

Soft, skin-interfaced microfluidic systems with integrated immunoassays, fluorometric sensors, and impedance measurement capabilities

Kim

Lee

Reeder

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Soft microfluidic systems that capture, store, and perform biomarker analysis of microliter volumes of sweat, in situ, as it emerges from the surface of the skin, represent an emerging class of wearable technology with powerful capabilities that complement those of traditional biophysical sensing devices. Recent work establishes applications in the real-time characterization of sweat dynamics and sweat chemistry in the context of sports performance and healthcare diagnostics. This paper presents a collection of advances in biochemical sensors and microfluidic designs that support multimodal operation in the monitoring of physiological signatures directly correlated to physical and mental stresses. These wireless, battery-free, skin-interfaced devices combine lateral flow immunoassays for cortisol, fluorometric assays for glucose and ascorbic acid (vitamin C), and digital tracking of skin galvanic responses. Systematic benchtop evaluations and field studies on human subjects highlight the key features of this platform for the continuous, noninvasive monitoring of biochemical and biophysical correlates of the stress state.

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“…This material incorporated multi-walled carbon nanotubes (MWCNT) provided by Nanoamor (purity 95%, outer mean diameter = 20 -40nm; length = 5 -15μm) in an Ecoflex 00-30 matrix. Once prepared, the solution was spread onto a clean glass surface, and casted with a casting knife to ensure a smooth and controlled final thickness of 300 microns [35].…”

Section: A Materialsmentioning

confidence: 99%

Flexible Surface Electrodes Targeting Biopotential Signals from Forearm Muscles for Control of Prosthetic Hands: Part 1 – Characterisation of sEMG Electrodes

O'Brien

Searle

Alıcı

2019

2019 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)

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This study is Part 1 of two studies which investigate the use of various flexible surface sensors as an alternative to the gold standard Ag/AgCl surface electromyography (sEMG) electrodes in identifying movement intention from a user during common hand gestures. Three conductive textiles, two commercial conductive elastomers and one E-skin elastomer produced on site were tested as biopotential electrodes to establish the efficacy of each in gathering movement intention from the human brain at the level of the muscle. Testing was performed in vivo on two participants across three hand gestures, with results demonstrating that sEMG electrodes made from a commercially sourced conductive fabric can outperform the traditional Ag/AgCl sEMG electrodes, obtaining substantially larger peak and RMS measurements. Given the disadvantages of Ag/AgCl electrodes over long usage periods, namely their tendency to dry out and significant skin preparation, resulting in variable impedances and skin irritation respectively, the incorporation of flexible surface EMG electrodes in hand prosthetic control systems would increase functionality of the prosthetic devices, consequently increasing the quality of life of prosthetic hand users. Disciplines Disciplines Engineering | Science and Technology Studies Publication Details Publication Details O'Brien, S., Searle, T. & Alici, G. (2019). Flexible surface electrodes targeting biopotential signals from forearm muscles for control of prosthetic hands: Part 1-Characterisation of semg electrodes. IEEE/ ASME International Conference on Advanced Intelligent Mechatronics, AIM (pp. 1019-1024). United States: IEEE.

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Ultra-stretchable MWCNT–Ecoflex piezoresistive sensors for human motion detection applications

Cited by 83 publications

References 27 publications

3D Printed Silicone Meniscus Implants: Influence of the 3D Printing Process on Properties of Silicone Implants

3D Printed Silicone Meniscus Implants: Influence of the 3D Printing Process on Properties of Silicone Implants

Soft, skin-interfaced microfluidic systems with integrated immunoassays, fluorometric sensors, and impedance measurement capabilities

Flexible Surface Electrodes Targeting Biopotential Signals from Forearm Muscles for Control of Prosthetic Hands: Part 1 – Characterisation of sEMG Electrodes

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