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Wearable electronics

Jiabin Guo, Qichong Zhang, Qiulong Li, Juan Sun, Chaowei Li, Bing He, Zhenyu Zhou, Liyan Xie, Ming-Xing Li, Yagang Yao
Extensive progress has been made in fiber-shaped asymmetric supercapacitors (FASCs) for portable and wearable electronics. However, positive and negative electrodes must be distinguished and low energy densities are crucial challenge and thus limit their practical applications. This paper reports an efficient method to directly grow TiN nanowire arrays@V2O5 nanosheets core-shell heterostructures on carbon nanotube fibers as non-polarity electrodes. Benefiting from their unique heterostructure, single electrodes possess high specific capacitances of 195...
August 14, 2018: ACS Applied Materials & Interfaces
Tao Zhao, Guoming Zhang, Fangshuo Zhou, Sen Zhang, Chao Deng
Rechargeable Zn-ion batteries are promising candidates for wearable energy storage devices. However, their performance is severely restricted by the low conductivity and inferior mass loading. Herein, a new type of the textile based electrodes with 3D hierarchical branched design is reported. Both Ni nanoparticles and carbon nanotubes are used to build conductive coatings on the textiles. The 3D hierarchical nanostructures, consisting of the vertical-aligned nanosheets and the fluffy-like small flakes, grow on the conductive textiles to form the self-supported electrodes...
August 14, 2018: Small
Wenbo Li, Jiangjiang Duan, Junwen Zhong, Nan Wu, Shizhe Lin, Zisheng Xu, Shuwen Chen, Yuan Pan, Liang Huang, Bin Hu, Jun Zhou
Flexible pressure sensors possess promising applications in artificial electronic skin (e-skin), intelligence robot, wearable health monitoring, flexible physiological signal sensing, etc. Herein, we design a flexible pressure sensor with robust stability, high sensitivity and large linear pressure region based on tetrafluoroethylene-hexafluoropropylene-vinylide (THV) / cyclic olefin copolymer (COC) piezoelectret nanogenerator. According to the theoretical analysis for piezoelectret nanogenerators with imbalanced charge distribution, THV and COC are utilized to promote the electric field inside the piezoelectret for output voltage enhancement...
August 14, 2018: ACS Applied Materials & Interfaces
Junjie Wei, Jie Zhou, Shasha Su, Jinhua Jiang, Jing Feng, Qigang Wang
With the boom of flexible electronic products and wearable devices, flexible energy storage devices, e.g., supercapacitors with high performance, are attracting increasing interest. A flexible water-deactivated polyelectrolyte hydrogel electrolyte with good mechanical properties and high ionic conductivity was prepared using an anionic polymer CMC and a cationic monomer MAPTAC. It was then applied in a supercapacitor with flexible activated carbon electrodes. This flexible supercapacitor possesses a high operating voltage of 2...
August 13, 2018: ChemSusChem
Tao Chen, Qiongfeng Shi, Kunpu Li, Zhan Yang, Huicong Liu, Lining Sun, Jan A Dziuban, Chengkuo Lee
Triboelectric nanogenerator (TENG) is a promising technology because it can harvest energy from the environment to enable self-sustainable mobile and wearable electronic devices. In this work, we present a flexible touch pad capable of detecting the contact location of an object and generating substantial energy simultaneously based on the coupling of triboelectric effects and electrostatic induction. The touch pad consists of Polytetrafluoroethylene (PTFE) thin film, multiple Aluminum (Al) electrodes and Polyethylene terephthalate (PET) layers, which can be achieved through low cost, simplified and scalable fabrication process...
August 13, 2018: Nanomaterials
Sai Kishore Ravi, Tingfeng Wu, Vishnu Saran Udayagiri, Xuan Minh Vu, Yanan Wang, Michael R Jones, Swee Ching Tan
Energy self-sufficiency is an inspirational design feature of biological systems that fulfills sensory functions. Plants such as the "touch-me-not" and "Venus flytrap" not only sustain life by photosynthesis, but also execute specialized sensory responses to touch. Photosynthesis enables these organisms to sustainably harvest and expend energy, powering their sensory abilities. Photosynthesis therefore provides a promising model for self-powered sensory devices like electronic skins (e-skins)...
August 12, 2018: Advanced Materials
James Brogan, Immanuel Baskaran, Navin Ramachandran
The on-demand digital healthcare ecosystem is on the near horizon. It has the potential to extract a wealth of information from "big data" collected at the population level, to enhance preventive and precision medicine at the patient level. This may improve efficiency and quality while decreasing cost of healthcare delivered by professionals. However, there are still security and privacy issues that need to be addressed before algorithms, data, and models can be mobilized safely at scale. In this paper we discuss how distributed ledger technologies can play a key role in advancing electronic health, by ensuring authenticity and integrity of data generated by wearable and embedded devices...
2018: Computational and Structural Biotechnology Journal
N Khalili, X Shen, H E Naguib
The development of flexible pressure sensors with human-like sensing capabilities is an emerging field due to their wide range of applications from human robot interactions to wearable electronics. Piezoresistive sensors respond to externally induced mechanical stimuli through changes in their electrical resistance. The current state-of-the-art piezoresistive sensors are mainly constructed via dispersion of conductive nanofillers in an elastomer matrix making their performance strongly reliable on the degree of dispersion...
August 10, 2018: Soft Matter
Chenying Wang, Hongjia Zhang, Chunlei Li, Yun He, Le Zhang, Xinger Zhao, Qu Yang, Dan Xian, Qi Mao, Bin Peng, Ziyao Zhou, Wanzhao Cui, Zhongqiang Hu
In spite of recent rapid development of flexible electronics, voltage tunable spintronic structures and devices on flexible substrates have been rarely studied. Here, voltage control of magnetic anisotropy (VCMA) is demonstrated via ionic gel (IG) gating on flexible polyimide substrates with a circuit operating voltage of 1.8 V. A reversible, non-volatile VCMA switching of 114 Oe is achieved in Pt/Fe/Pt multilayer, where the spatial magnetic anisotropy distribution is determined quantitatively by electron spin resonance (ESR) technique...
August 10, 2018: ACS Applied Materials & Interfaces
Carsten Sommer, Diego Zuccolin, Valdo Arnera, Nicole Schmitz, Pernilla Adolfsson, Nicoletta Colombo, Raphaelle Gilg, Bryan McDowell
Clinical trials are slow and costly, built around the research centers that study local participants. Building clinical trials around patients in their homes and community through remote visits and monitoring could enhance recruitment and increase convenience for participants. This study evaluated different trial settings, a decentralized arm via telemedicine center (virtual study conduct), a conventional arm via health clinic (onsite study conduct) and a mixed model arm. Acute low-back pain patients (20-65 years) were recruited to this non-interventional trial in Switzerland...
September 2018: Contemporary Clinical Trials Communications
Meredith Hyatt Barbee, Kunal Mondal, John Z Deng, Vivek Bharambe, Taylor V Neumann, Jacob Adams, Nicholas Boechler, Michael D Dickey, Stephen L Craig
Soft and stretchable electronics are promising for a variety of applications such as wearable electronics, human-machine interfaces, and soft robotics. These devices, which are often encased in elastomeric materials, maintain or adjust their functionality during deformation, but can fail catastrophically if extended too far. Here, we report new functional composites in which stretchable electronic properties are coupled to molecular mechanochromic function, enabling at-a-glace visual cues that inform user control...
August 9, 2018: ACS Applied Materials & Interfaces
Keval K Sonigara, Hiren K Machhi, Jayraj V Vaghasiya, Alain Gibaud, Swee Ching Tan, Saurabh S Soni
Quasi-solid-state dye-sensitized solar cells (DSSCs) fabricated with lightweight flexible substrates have a great potential in wearable electronic devices for in situ powering. However, the poor lifespan of these DSSCs limits their practical application. Strong mechanical stresses involved in practical applications cause breakage of the electrode/electrolyte interface in the DSSCs greatly affecting their performance and lifetime. Here, a mechanically robust, low-cost, long-lasting, and environment-friendly quasi-solid-state DSSC using a smart thermoreversible water-based polymer gel electrolyte with self-healing characteristics at a low temperature (below 0 °C) is demonstrated...
August 9, 2018: Small
Michael J Mirro, Emily E Keltner, Amelia E Roebuck, Samuel F Sears
BACKGROUND: Guideline-directed medical therapy (GDMT) for patients with Heart Failure with reduced ejection fraction (HFrEF) has been challenging to universally achieve. Healthcare providers who seek to achieve optimal medical therapy frequently consider either a wearable cardioverter defibrillator (WCD) or an implantable cardioverter defibrillator (ICD) as indicated. The dynamic process of communication and physician recommendations marks a setting to study the relative inter-dependence of medical therapies and best practice...
August 9, 2018: Pacing and Clinical Electrophysiology: PACE
Peng Wang, Zhiwei Peng, Muxiao Li, YuHuang Wang
Flexible transparent conductors are an enabling component for large-area flexible displays, wearable electronics, and implantable medical sensors that can wrap around and move with the body. However, conventional conductive materials decay quickly under tensile strain, posing a significant hurdle for functional flexible devices. Here, we show that high electrical conductivity, mechanical stretchability, and optical transparency can be simultaneously attained by compositing long metallic double-walled carbon nanotubes with a polydimethylsiloxane substrate...
August 9, 2018: Small
Tingrui Lin, Mengni Shi, Furong Huang, Jing Peng, Qingwen Bai, Jiuqiang Li, Maolin Zhai
High-performance hydrogel electrolytes play a crucial role in flexible supercapacitors (SCs). However, the unsatisfactory mechanical properties of widely-used polyvinyl alcohol-based electrolytes greatly limit their use in the flexible SCs. Here a novel Li2 SO4 -containing agarose/polyacrylamide double-network (Li-AG/PAM DN) hydrogel electrolyte was synthesized by a heating-cooling and subsequent radiation-induced polymerization and crosslinking process. The Li-AG/PAM DN hydrogel electrolyte possesses extremely excellent mechanical properties with a compression strength of 150 MPa, a fracture compression strain of above 99...
August 8, 2018: ACS Applied Materials & Interfaces
In Ho Kim, Taeyeong Yun, Jae-Eun Kim, Hayoung Yu, Suchithra Padmajan Sasikala, Kyung Eun Lee, Sung Hwan Koo, Hoseong Hwang, Hong Ju Jung, Jeong Young Park, Hyeon Su Jeong, Sang Ouk Kim
Inspired by mussel adhesive polydopamine (PDA), effective reinforcement of graphene-based liquid crystalline fibers to attain high mechanical and electrical properties simultaneously is presented. The two-step defect engineering, relying on bioinspired surface polymerization and subsequent solution infiltration of PDA, addresses the intrinsic limitation of graphene fibers arising from the folding and wrinkling of graphene layers during the fiber-spinning process. For a clear understanding of the mechanism of PDA-induced defect engineering, interfacial adhesion between graphene oxide sheets is straightforwardly analyzed by the atomic force microscopy pull-off test...
August 8, 2018: Advanced Materials
Sarah Whitehead, Kevin Till, Dan Weaving, Ben Jones
BACKGROUND: Quantifying the peak match demands within the football codes is useful for the appropriate prescription of external training load. Wearable microtechnology devices can be used to identify the peak match demands, although various methodologies exist at present. OBJECTIVES: This systematic review aimed to identify the methodologies and microtechnology-derived variables used to determine the peak match demands, and to summarise current data on the peak match demands in the football codes...
August 7, 2018: Sports Medicine
Zhiyu Wang, Si Qin, Shayan Seyedin, Jizhen Zhang, Jiangting Wang, Ariana Levitt, Na Li, Carter Haines, Raquel Ovalle-Robles, Weiwei Lei, Yury Gogotsi, Ray H Baughman, Joselito M Razal
Yarn-shaped supercapacitors (YSCs) once integrated into fabrics provide promising energy storage solutions to the increasing demand of wearable and portable electronics. In such device format, however, it is a challenge to achieve outstanding electrochemical performance without compromising flexibility. Here, MXene-based YSCs that exhibit both flexibility and superior energy storage performance by employing a biscrolling approach to create flexible yarns from highly delaminated and pseudocapacitive MXene sheets that are trapped within helical yarn corridors are reported...
August 7, 2018: Small
Min Zhong, Fangwei Zhang, Youyi Yu, Jiali Zhang, Wenzhuo Shen, Shouwu Guo
Flexible micro-supercapacitor (MSCs) as power supplier is of importance to portable and wearable electronic devices. Despite enormous efforts made, a simple, inexpensive high-throughput technique of graphene-based MSCs is still challenging. In this work, flexible MSCs is fabricated through commercial laser printing of the interdigital configuration of reduced graphene oxide-graphene oxide-reduced graphene oxide (rGO-GO-rGO) where the conductive rGO works as electrodes and the insulated GO serves as separator...
August 7, 2018: Nanotechnology
Saewon Kang, Seungse Cho, Ravi Shanker, Hochan Lee, Jonghwa Park, Doo-Seung Um, Youngoh Lee, Hyunhyub Ko
We demonstrate ultrathin, transparent, and conductive hybrid nanomembranes (NMs) with nanoscale thickness, consisting of an orthogonal silver nanowire array embedded in a polymer matrix. Hybrid NMs significantly enhance the electrical and mechanical properties of ultrathin polymer NMs, which can be intimately attached to human skin. As a proof of concept, we present a skin-attachable NM loudspeaker, which exhibits a significant enhancement in thermoacoustic capabilities without any significant heat loss from the substrate...
August 2018: Science Advances
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