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https://www.readbyqxmd.com/read/29345473/highly-sensitive-and-ultrastable-skin-sensors-for-biopressure-and-bioforce-measurements-based-on-hierarchical-microstructures
#1
Qi-Jun Sun, Jiaqing Zhuang, Shishir Venkatesh, Ye Zhou, Su-Ting Han, Wei Wu, Ka-Wai Kong, Wen-Jung Li, Xianfeng Chen, Robert K Y Li, Vellaisamy A L Roy
Piezoresistive microsensors are considered to be essential components of the future wearable electronic devices. However, the expensive cost, complex fabrication technology, poor stability, and low yield have limited their developments for practical applications. Here, we present a cost-effective, relatively simple, and high-yield fabrication approach to construct highly sensitive and ultrastable piezoresistive sensors using a bioinspired hierarchically structured graphite/polydimethylsiloxane composite as the active layer...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29345430/wearable-wireless-tyrosinase-bandage-and-microneedle-sensors-toward-melanoma-screening
#2
Bianca Ciui, Aida Martin, Rupesh K Mishra, Barbara Brunetti, Tatsuo Nakagawa, Thomas J Dawkins, Mengjia Lyu, Cecilia Cristea, Robert Sandulescu, Joseph Wang
Wearable bendable bandage-based sensor and a minimally invasive microneedle biosensor are described toward rapid screening of skin melanoma. These wearable electrochemical sensors are capable of detecting the presence of the tyrosinase (TYR) enzyme cancer biomarker in the presence of its catechol substrate, immobilized on the transducer surface. In the presence of the surface TYR biomarker, the immobilized catechol is rapidly converted to benzoquinone that is detected amperometrically, with a current signal proportional to the TYR level...
January 18, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29345124/disposable-morpho-menelaus-based-flexible-microfluidic-and-electronic-sensor-for-the-diagnosis-of-neurodegenerative-disease
#3
Zhenzhu He, Abdelrahman Elbaz, Bingbing Gao, Junning Zhang, Enben Su, Zhongze Gu
Rapid early disease prevention or precise diagnosis is almost impossible in low-resource settings. Natural ordered structures in nature have great potential for the development of ultrasensitive biosensors. Here, motivated by the unique structures and extraordinary functionalities of ordered structures in nature, a biosensor based on butterfly wings is presented. In this study, a flexible Morpho menelaus (M. menelaus) based wearable sensor is integrated with a microfluidic system and electronic networks to facilitate the diagnosis of neurodegenerative disease (ND)...
January 18, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29343772/shape-matching-soft-mechanical-metamaterials
#4
M J Mirzaali, S Janbaz, M Strano, L Vergani, A A Zadpoor
Architectured materials with rationally designed geometries could be used to create mechanical metamaterials with unprecedented or rare properties and functionalities. Here, we introduce "shape-matching" metamaterials where the geometry of cellular structures comprising auxetic and conventional unit cells is designed so as to achieve a pre-defined shape upon deformation. We used computational models to forward-map the space of planar shapes to the space of geometrical designs. The validity of the underlying computational models was first demonstrated by comparing their predictions with experimental observations on specimens fabricated with indirect additive manufacturing...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29342966/fabrication-of-a-textile-based-wearable-blood-leakage-sensor-using-screen-offset-printing
#5
Ken-Ichi Nomura, Yoshinori Horii, Shusuke Kanazawa, Yasuyuki Kusaka, Hirobumi Ushijima
We fabricate a wearable blood leakage sensor on a cotton textile by combining two newly developed techniques. First, we employ a screen-offset printing technique that avoids blurring, short circuiting between adjacent conductive patterns, and electrode fracturing to form an interdigitated electrode structure for the sensor on a textile. Furthermore, we develop a scheme to distinguish blood from other substances by utilizing the specific dielectric dispersion of blood observed in the sub-megahertz frequency range...
January 15, 2018: Sensors
https://www.readbyqxmd.com/read/29342960/a-low-cost-inkjet-printed-aptamer-based-electrochemical-biosensor-for-the-selective-detection-of-lysozyme
#6
Niazul Islam Khan, Alec G Maddaus, Edward Song
Recently, inkjet-printing has gained increased popularity in applications such as flexible electronics and disposable sensors, as well as in wearable sensors because of its multifarious advantages. This work presents a novel, low-cost immobilization technique using inkjet-printing for the development of an aptamer-based biosensor for the detection of lysozyme, an important biomarker in various disease diagnosis. The strong affinity between the carbon nanotube (CNT) and the single-stranded DNA is exploited to immobilize the aptamers onto the working electrode by printing the ink containing the dispersion of CNT-aptamer complex...
January 15, 2018: Biosensors
https://www.readbyqxmd.com/read/29342953/review-of-recent-metamaterial-microfluidic-sensors
#7
REVIEW
Ahmed Salim, Sungjoon Lim
Metamaterial elements/arrays exhibit a sensitive response to fluids yet with a small footprint, therefore, they have been an attractive choice to realize various sensing devices when integrated with microfluidic technology. Micro-channels made from inexpensive biocompatible materials avoid any contamination from environment and require only microliter-nanoliter sample for sensing. Simple design, easy fabrication process, light weight prototype, and instant measurements are advantages as compared to conventional (optical, electrochemical and biological) sensing systems...
January 15, 2018: Sensors
https://www.readbyqxmd.com/read/29341881/clinical-implications-of-technological-advances-in-screening-for-atrial-fibrillation
#8
REVIEW
Nikhil Singh, Sung Chun, David Hadley, Victor Froelicher
The incidence of atrial fibrillation (AF) continues to increase worldwide as people live longer. AF is the leading cause of stroke among patients older than 75 years and is responsible for at least 15% of all strokes. Industry has responded to this problem with a plethora of monitoring devices. These include single lead ECG adhesive sensors, implantable loop recorders, smartphone attachments and wearables. This review will concentrate on clinical studies using these technologies. There are wearables including watches and watch-like devices that will be mentioned but these have not been validated for clinical use...
January 13, 2018: Progress in Cardiovascular Diseases
https://www.readbyqxmd.com/read/29339577/a-wearable-pressure-sensor-based-on-ultra-violet-ozone-microstructured-carbon-nanotube-polydimethylsiloxane-arrays-for-electronic-skins
#9
Guohui Yu, Jingdong Hu, Jianping Tan, Yang Gao, Yongfeng Lu, Fu-Zhen Xuan
Pressure sensors with high performance (e.g., a broad pressure sensing range, high sensitivities, rapid response/relaxation speeds, temperature-stable sensing), as well as a cost-effective and highly efficient fabrication method are highly desired for electronic skins. In this research, a high-performance pressure sensor based on microstructured carbon nanotube/polydimethylsiloxane arrays was fabricated using an ultra-violet/ozone (UV/O3) microengineering technique. The UV/O3 microengineering technique is controllable, cost-effective, and highly efficient since it is conducted at room temperature in an ambient environment...
January 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29338959/a-new-window-into-psychosis-the-rise-digital-phenotyping-smartphone-assessment-and-mobile-monitoring
#10
John Torous, Matcheri Keshavan
This commentary piece discusses recent advances in the use of mobile technologies like smartphone and wearable sensors for schizophrenia research. By framing both the opportunities as well as challenges for the field, this piece aims to frame the both current and future research efforts.
January 12, 2018: Schizophrenia Research
https://www.readbyqxmd.com/read/29338570/a-novel-rubric-to-evaluate-wearable-cameras-for-assessment-of-interrater-reliability
#11
Amanda C Jozkowski, Echo A Presgraves, Krista L Hodges, Erica N Wirth, Nicole E Brandstetter, Molly T Thayer
Research has reported on traditional methods of assessing interrater reliability but, currently, no such standard protocol exists for selection of alternative methods of assessing interrater reliability, such as wearable video cameras. The professions of occupational therapy and occupational science take a unique ecological perspective when evaluating individuals, which focuses on the naturalistic perspective of an individual, ideally resulting in optimal performance. Given current advancements in technology, wearable, low-cost, unobtrusive, first-person view digital video cameras are readily available for use in research...
January 1, 2018: OTJR: Occupation, Participation and Health
https://www.readbyqxmd.com/read/29338249/highly-sensitive-and-wearable-in2o3-nanoribbon-transistor-biosensors-with-integrated-on-chip-gate-for-glucose-monitoring-in-body-fluids
#12
Qingzhou Liu, Yihang Liu, Fanqi Wu, Xuan Cao, Zhen Li, Mervat Alharbi, Ahmad N Abbas, Moh R Amer, Chongwu Zhou
Nanoribbon- and nanowire-based field-effect transistor (FET) biosensors have stimulated a lot of interest. However, most FET biosensors were achieved by using bulky Ag/AgCl electrodes or metal wire gates, which have prevented the biosensors from becoming truly wearable. Here, we demonstrate highly sensitive and conformal In2O3 nanoribbon FET biosensors with a fully integrated on-chip gold side gate, which have been laminated onto various surfaces, such as artificial arms and watches, and have enabled glucose detection in various body fluids, such as sweat and saliva...
January 17, 2018: ACS Nano
https://www.readbyqxmd.com/read/29337954/wearable-data
#13
Yasemin Saplakoglu
No abstract text is available yet for this article.
January 16, 2018: Scientific American
https://www.readbyqxmd.com/read/29335498/stretchable-electrospun-pvdf-hfp-co-zno-nanofibers-as-piezoelectric-nanogenerators
#14
Hemalatha Parangusan, Deepalekshmi Ponnamma, Mariam Al Ali Al-Maadeed
Herein, we investigate the morphology, structure and piezoelectric performances of neat polyvinylidene fluoride hexafluoropropylene (PVDF-HFP) and PVDF-HFP/Co-ZnO nanofibers, fabricated by electrospinning. An increase in the amount of crystalline β-phase of PVDF-HFP has been observed with the increase in Co-doped ZnO nanofiller concentration in the PVDF-HFP matrix. The dielectric constants of the neat PVDF-HFP and PVDF-HFP/2 wt.% Co-ZnO nanofibers are derived as 8 and 38 respectively. The flexible nanogenerator manipulated from the polymer nanocomposite (PVDF-HFP/Co-ZnO) exhibits an output voltage as high as 2...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29334198/enzyme-based-glucose-sensor-from-invasive-to-wearable-device
#15
REVIEW
Hyunjae Lee, Yongseok Joseph Hong, Seungmin Baik, Taeghwan Hyeon, Dae-Hyeong Kim
Blood glucose concentration is a key indicator of patients' health, particularly for symptoms associated with diabetes mellitus. Because of the large number of diabetic patients, many approaches for glucose measurement have been studied to enable continuous and accurate glucose level monitoring. Among them, electrochemical analysis is prominent because it is simple and quantitative. This technology has been incorporated into commercialized and research-level devices from simple test strips to wearable devices and implantable systems...
January 15, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29333853/a-highly-sensitive-and-very-stretchable-strain-sensor-based-on-a-rubbery-semiconductor
#16
Hae-Jin Kim, Anish Thukral, Cunjiang Yu
There is a growing interest in developing stretchable strain sensors to quantify the large mechanical deformation and strain associated with the activities for a wide range of species, such as humans, machines, and robots. Here, we report a novel stretchable strain sensor entirely in a rubber format by using a solution processed rubbery semiconductor as the sensing material to achieve high sensitivity, large mechanical strain tolerance, hysteresis-less and highly linear responses. Specifically, the rubbery semiconductor exploits π-π stacked poly(3-hexylthiophene-2,5-diyl) nanofibrils (P3HT-NFs) percolated in silicone elastomer of polydimethylsiloxane (PDMS) to yield semiconducting nanocomposite with a large mechanical stretchability, although P3HT is a well-known nonstretchable semiconductor...
January 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29332423/first-experiences-with-a-wearable-multisensor-in-an-outpatient-glucose-monitoring-study-part-i-the-users-view
#17
Andreas Caduff, Mattia Zanon, Pavel Zakharov, Martin Mueller, Mark Talary, Achim Krebs, Werner A Stahel, Marc Donath
BACKGROUND: Extensive past work showed that noninvasive continuous glucose monitoring with a wearable Multisensor device worn on the upper arm provides useful information about glucose trends to improve diabetes therapy in controlled and semicontrolled conditions. METHODS: To test previous findings also in uncontrolled in-clinic and outpatient conditions, a long-term study has been conducted to collect Multisensor and reference glucose data in a population of 20 type 1 diabetes subjects...
January 1, 2018: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/29331656/effect-of-a-wearable-patient-sensor-on-care-delivery-for-preventing-pressure-injuries-in-acutely-ill-adults-a-pragmatic-randomized-clinical-trial-ls-hapi-study
#18
David Pickham, Nic Berte, Mike Pihulic, Andre Valdez, Barbara Mayer, Manisha Desai
IMPORTANCE: Though theoretically sound, studies have failed to demonstrate the benefit of routine repositioning of at-risk patients for the prevention of hospital acquired pressure injuries. OBJECTIVE: To assess the clinical effectiveness of a wearable patient sensor to improve care delivery and patient outcomes by increasing the total time with turning compliance and preventing pressure injuries in acutely ill patients. DESIGN: Pragmatic, investigator initiated, open label, single site, randomized clinical trial...
December 30, 2017: International Journal of Nursing Studies
https://www.readbyqxmd.com/read/29330962/skin-conformal-polymer-electrodes-for-clinical-ecg-and-eeg-recordings
#19
Flurin Stauffer, Moritz Thielen, Christina Sauter, Séverine Chardonnens, Simon Bachmann, Klas Tybrandt, Christian Peters, Christofer Hierold, Janos Vörös
Preparation-free and skin compliant biopotential electrodes with high recording quality enable wearables for future healthcare and the Internet of Humans. Here, super-soft and self-adhesive electrodes are presented for use on dry and hairy skin without skin preparation or attachment pressure. The electrodes show a skin-contact impedance of 50 kΩ cm2 at 10 Hz that is comparable to clinical standard gel electrodes and lower than existing dry electrodes. Microstructured electrodes inspired by grasshopper feet adhere repeatedly to the skin with a force of up to 0...
January 13, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29330762/how-honest-are-the-signals-a-protocol-for-validating-wearable-sensors
#20
Varol Onur Kayhan, Zheng Chris Chen, Kimberly A French, Tammy D Allen, Kristen Salomon, Alison Watkins
There is growing interest among organizational researchers in tapping into alternative sources of data beyond self-reports to provide a new avenue for measuring behavioral constructs. Use of alternative data sources such as wearable sensors is necessary for developing theory and enhancing organizational practice. Although wearable sensors are now commercially available, the veracity of the data they capture is largely unknown and mostly based on manufacturers' claims. The goal of this research is to test the validity and reliability of data captured by one such wearable badge (by Humanyze) in the context of structured meetings where all individuals wear a badge for the duration of the encounter...
January 12, 2018: Behavior Research Methods
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