400 research outputs found
Flexible and Wearable Piezoelectric Nanogenerators
No full textIn this age of advanced smartphones and wearable devices, the need of unlimited power has become a basic necessity. Most of the gadgets rely on some sort of power source in the form of batteries or power adapters. For example, smart watches have become very common these days and have a huge potential for implementation of energy harvesters. In near future it will be really desirable to have self-powered smart wearable devices which meet their energy needs by scavenging mechanical energy produced by physical activities. In order to solve the problem of fast battery depletion in modern smart devices, a lot of research has been carried out in the field of energy harvesters especially using thin film technologies and polymer nanofibers. Most interesting among them are the nanogenerators using polymers with piezoelectric properties like PVDF due to their low production cost and high conversion efficiency. Polymer-based nanofiber energy harvesters are not only relevant for wearable devices and smartphones but also for biomedical energy scavenging applications primarily due to their biocompatibility. Chapter 2 particularly deals with current scenario of different types of nanofiber-based energy harvesters. A comprehensive review related to current research work going on in the field of nanofiber-based energy harvesters is presented here
Nature-Inspired Self-Powered Sensors and Energy Harvesters
No full textChapter 3 presents a comprehensive review of the various biomimetic self-powered and low-powered MEMS pressure and flow sensors that take inspiration from the biological flow sensors found in the marine world. The sensing performance of the biological flow sensors in marine animals has inspired engineers and scientists to develop efficient state-of-the-art sensors for a variety of real-life applications. In an attempt to achieve high-performance artificial flow sensors, researchers have mimicked the morphology, sensing principle, materials, and functionality of the biological sensors. Inspiration was derived from the survival hydrodynamics featured by various marine animals to develop sensors for sensing tasks in underwater vehicles. The mechanoreceptors of crocodiles have inspired the development of slowly and rapidly adapting MEMS sensory domes for passive underwater sensing. Likewise, the lateral line sensing system in fishes which is capable of generating a three-dimensional map of the surroundings was mimicked to achieve artificial hydrodynamic vision on underwater vehicles. Harbor seals are known to achieve high sensitivity in sensing flows within the wake street of a swimming fish due to the undulatory geometry of the whiskers. Whisker inspired structures were embedded into MEMS sensing membranes to understand their vortex shedding behavior. At the outset, this work comprehensively reviews the sensing mechanisms observed in fishes, crocodiles, and harbor seals. In addition, this chapter presents an in-depth commentary on the recent developments in this area where different researchers have taken inspiration from these aforementioned underwater creatures and developed some of the most efficient artificial sensing systems
Degradable PVAc-graphene nanofibrous membrane for flexible piezocapacitive sensors
No full textWith growing life expectancy and a rise in population with sedentary lifestyles, the load on existing healthcare infrastructure is expected to increase manifolds in the next two decades. As per National Institute for Public Health and the Environment (RIVM) the number of centenarians will quadruple by 2040 [1]. The need of the hour is robust, reliable, sensitive, and inexpensive wearable sensors capable of providing intimate and detailed information regarding a person’s physiological parameters. However, it is also critical that such sensors are environmentally friendly and that production is sustainable. In this work, we present graphene-polyvinyl acetate (PVAc) electrospun nanofibrous membrane-based degradable piezocapacitive sensors for applications in wearables. The sensor featured in this work comprises of 0.25 wt.% graphene-loaded electrospun nanofiber membrane sandwiched between two layers of fabric-based flexible electrodes. The degradability of the sensors has been demonstrated previously [2]. It is expected that sensors similar to the one presented here will gain widespread acceptance for future applications in flexible electronics and wearable devices.[1] “Life expectancy | Volksgezondheid Toekomst Verkenning.” [Online]. Available: https://www.vtv2018.nl/en/life-expectancy. [2] D. Sengupta et al., ACS Appl. Mater. Interfaces, vol. 15, (2023) 22351–22366
Degradable PVAc-graphene nanofibrous membrane for flexible piezocapacitive sensors
No full textWith growing life expectancy and a rise in population with sedentary lifestyles, the load on existing healthcare infrastructure is expected to increase manifolds in the next two decades. As per National Institute for Public Health and the Environment (RIVM) the number of centenarians will quadruple by 2040 [1]. The need of the hour is robust, reliable, sensitive, and inexpensive wearable sensors capable of providing intimate and detailed information regarding a person’s physiological parameters. However, it is also critical that such sensors are environmentally friendly and that production is sustainable. In this work, we present graphene-polyvinyl acetate (PVAc) electrospun nanofibrous membrane-based degradable piezocapacitive sensors for applications in wearables. The sensor featured in this work comprises of 0.25 wt.% graphene-loaded electrospun nanofiber membrane sandwiched between two layers of fabric-based flexible electrodes. The degradability of the sensors has been demonstrated previously [2]. It is expected that sensors similar to the one presented here will gain widespread acceptance for future applications in flexible electronics and wearable devices.[1] “Life expectancy | Volksgezondheid Toekomst Verkenning.” [Online]. Available: https://www.vtv2018.nl/en/life-expectancy. [2] D. Sengupta et al., ACS Appl. Mater. Interfaces, vol. 15, (2023) 22351–22366
Degradable PVAc-graphene nanofibrous membrane for flexible piezocapacitive sensors
No full textWith growing life expectancy and a rise in population with sedentary lifestyles, the load on existing healthcare infrastructure is expected to increase manifolds in the next two decades. As per National Institute for Public Health and the Environment (RIVM) the number of centenarians will quadruple by 2040 [1]. The need of the hour is robust, reliable, sensitive, and inexpensive wearable sensors capable of providing intimate and detailed information regarding a person’s physiological parameters. However, it is also critical that such sensors are environmentally friendly and that production is sustainable. In this work, we present graphene-polyvinyl acetate (PVAc) electrospun nanofibrous membrane-based degradable piezocapacitive sensors for applications in wearables. The sensor featured in this work comprises of 0.25 wt.% graphene-loaded electrospun nanofiber membrane sandwiched between two layers of fabric-based flexible electrodes. The degradability of the sensors has been demonstrated previously [2]. It is expected that sensors similar to the one presented here will gain widespread acceptance for future applications in flexible electronics and wearable devices.[1] “Life expectancy | Volksgezondheid Toekomst Verkenning.” [Online]. Available: https://www.vtv2018.nl/en/life-expectancy. [2] D. Sengupta et al., ACS Appl. Mater. Interfaces, vol. 15, (2023) 22351–22366
Degradable PVAc-graphene nanofibrous membrane for flexible piezocapacitive sensors
No full textWith growing life expectancy and a rise in population with sedentary lifestyles, the load on existing healthcare infrastructure is expected to increase manifolds in the next two decades. As per National Institute for Public Health and the Environment (RIVM) the number of centenarians will quadruple by 2040 [1]. The need of the hour is robust, reliable, sensitive, and inexpensive wearable sensors capable of providing intimate and detailed information regarding a person’s physiological parameters. However, it is also critical that such sensors are environmentally friendly and that production is sustainable. In this work, we present graphene-polyvinyl acetate (PVAc) electrospun nanofibrous membrane-based degradable piezocapacitive sensors for applications in wearables. The sensor featured in this work comprises of 0.25 wt.% graphene-loaded electrospun nanofiber membrane sandwiched between two layers of fabric-based flexible electrodes. The degradability of the sensors has been demonstrated previously [2]. It is expected that sensors similar to the one presented here will gain widespread acceptance for future applications in flexible electronics and wearable devices.[1] “Life expectancy | Volksgezondheid Toekomst Verkenning.” [Online]. Available: https://www.vtv2018.nl/en/life-expectancy. [2] D. Sengupta et al., ACS Appl. Mater. Interfaces, vol. 15, (2023) 22351–22366
Degradable PVAc-graphene nanofibrous membrane for flexible piezocapacitive sensors
No full textWith growing life expectancy and a rise in population with sedentary lifestyles, the load on existing healthcare infrastructure is expected to increase manifolds in the next two decades. As per National Institute for Public Health and the Environment (RIVM) the number of centenarians will quadruple by 2040 [1]. The need of the hour is robust, reliable, sensitive, and inexpensive wearable sensors capable of providing intimate and detailed information regarding a person’s physiological parameters. However, it is also critical that such sensors are environmentally friendly and that production is sustainable. In this work, we present graphene-polyvinyl acetate (PVAc) electrospun nanofibrous membrane-based degradable piezocapacitive sensors for applications in wearables. The sensor featured in this work comprises of 0.25 wt.% graphene-loaded electrospun nanofiber membrane sandwiched between two layers of fabric-based flexible electrodes. The degradability of the sensors has been demonstrated previously [2]. It is expected that sensors similar to the one presented here will gain widespread acceptance for future applications in flexible electronics and wearable devices.[1] “Life expectancy | Volksgezondheid Toekomst Verkenning.” [Online]. Available: https://www.vtv2018.nl/en/life-expectancy. [2] D. Sengupta et al., ACS Appl. Mater. Interfaces, vol. 15, (2023) 22351–22366
Degradable PVAc-graphene nanofibrous membrane for flexible piezocapacitive sensors
No full textWith growing life expectancy and a rise in population with sedentary lifestyles, the load on existing healthcare infrastructure is expected to increase manifolds in the next two decades. As per National Institute for Public Health and the Environment (RIVM) the number of centenarians will quadruple by 2040 [1]. The need of the hour is robust, reliable, sensitive, and inexpensive wearable sensors capable of providing intimate and detailed information regarding a person’s physiological parameters. However, it is also critical that such sensors are environmentally friendly and that production is sustainable. In this work, we present graphene-polyvinyl acetate (PVAc) electrospun nanofibrous membrane-based degradable piezocapacitive sensors for applications in wearables. The sensor featured in this work comprises of 0.25 wt.% graphene-loaded electrospun nanofiber membrane sandwiched between two layers of fabric-based flexible electrodes. The degradability of the sensors has been demonstrated previously [2]. It is expected that sensors similar to the one presented here will gain widespread acceptance for future applications in flexible electronics and wearable devices.[1] “Life expectancy | Volksgezondheid Toekomst Verkenning.” [Online]. Available: https://www.vtv2018.nl/en/life-expectancy. [2] D. Sengupta et al., ACS Appl. Mater. Interfaces, vol. 15, (2023) 22351–22366
Degradable PVAc-graphene nanofibrous membrane for flexible piezocapacitive sensors
No full textWith growing life expectancy and a rise in population with sedentary lifestyles, the load on existing healthcare infrastructure is expected to increase manifolds in the next two decades. As per National Institute for Public Health and the Environment (RIVM) the number of centenarians will quadruple by 2040 [1]. The need of the hour is robust, reliable, sensitive, and inexpensive wearable sensors capable of providing intimate and detailed information regarding a person’s physiological parameters. However, it is also critical that such sensors are environmentally friendly and that production is sustainable. In this work, we present graphene-polyvinyl acetate (PVAc) electrospun nanofibrous membrane-based degradable piezocapacitive sensors for applications in wearables. The sensor featured in this work comprises of 0.25 wt.% graphene-loaded electrospun nanofiber membrane sandwiched between two layers of fabric-based flexible electrodes. The degradability of the sensors has been demonstrated previously [2]. It is expected that sensors similar to the one presented here will gain widespread acceptance for future applications in flexible electronics and wearable devices.[1] “Life expectancy | Volksgezondheid Toekomst Verkenning.” [Online]. Available: https://www.vtv2018.nl/en/life-expectancy. [2] D. Sengupta et al., ACS Appl. Mater. Interfaces, vol. 15, (2023) 22351–22366
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