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https://www.readbyqxmd.com/read/30334282/tactile-chemomechanical-transduction-based-on-an-elastic-microstructured-array-to-enhance-the-sensitivity-of-portable-biosensors
#1
Ting Wang, Dianpeng Qi, Hui Yang, Zhiyuan Liu, Ming Wang, Wan Ru Leow, Geng Chen, Jiancan Yu, Ke He, Hongwei Cheng, Yun-Long Wu, Han Zhang, Xiaodong Chen
Tactile sensors capable of perceiving biophysical signals such as force, pressure, or strain have attracted extensive interest for versatile applications in electronic skin, noninvasive healthcare, and biomimetic prostheses. Despite these great achievements, they are still incapable of detecting bio/chemical signals that provide even more meaningful and precise health information due to the lack of efficient transduction principles. Herein, a tactile chemomechanical transduction strategy that enables the tactile sensor to perceive bio/chemical signals is proposed...
October 17, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30332799/a-ln-si-based-saw-pressure-sensor
#2
Pascal Nicolay, Hugo Chambon, Gudrun Bruckner, Christian Gruber, Sylvain Ballandras, Emilie Courjon, Matthias Stadler
Surface Acoustic Wave (SAW) sensors are small, passive and wireless devices. We present here the latest results obtained in a project aimed at developing a SAW-based implantable pressure sensor, equipped with a well-defined, 30 μm-thick, 4.7 mm-in-diameter, Lithium Niobate (LN) membrane. A novel fabrication process was used to solve the issue of accurate membrane etching in LN. LN/Si wafers were fabricated first, using wafer-bonding techniques. Grinding/polishing operations followed, to reduce the LN thickness to 30 μm...
October 16, 2018: Sensors
https://www.readbyqxmd.com/read/30332756/experimental-characterization-of-inkjet-printed-stretchable-circuits-for-wearable-sensor-applications
#3
Jumana Abu-Khalaf, Razan Saraireh, Saleh Eisa, Ala'aldeen Al-Halhouli
This paper introduces a cost-effective method for the fabrication of stretchable circuits on polydimethylsiloxane (PDMS) using inkjet printing of silver nanoparticle ink. The fabrication method, presented here, allows for the development of fully stretchable and wearable sensors. Inkjet-printed sinusoidal and horseshoe patterns are experimentally characterized in terms of the effect of their geometry on stretchability, while maintaining adequate electrical conductivity. The optimal fabricated circuit, with a horseshoe pattern at an angle of 45°, is capable of undergoing an axial stretch up to a strain of 25% with a resistance under 800 Ω...
October 16, 2018: Sensors
https://www.readbyqxmd.com/read/30326667/electro-active-paper-as-a-flexible-mechanical-sensor-actuator-and-energy-harvesting-transducer-a-review
#4
REVIEW
Asif Khan, Faisal Raza Khan, Heung Soo Kim
Electro-active paper (EAPap) is a cellulose-based smart material that has shown promising results in a variety of smart applications (e.g., vibration sensor, piezo-speaker, bending actuator) with the merits of being flexible, lightweight, fracture tolerant, biodegradable, naturally abundant, cheap, biocompatible, and with the ability to form hybrid nanocomposites. This paper presents a review of the characterization and application of EAPap as a flexible mechanical vibration/strain sensor, bending actuator, and vibration energy harvester...
October 15, 2018: Sensors
https://www.readbyqxmd.com/read/30322173/adaptive-feedforward-compensating-self-sensing-method-for-active-flutter-suppression
#5
Yizhe Wang, Zhiwei Xu
A single piezoelectric patch can be used as both a sensor and an actuator by means of the self-sensing piezoelectric actuator, and the function of self-sensing shows several advantages in many application fields. However, some problems exist in practical application. First, a capacitance bridge circuit is set up to realize the function of self-sensing, but the precise matching of the capacitance of the bridge circuit is hard to obtain due to the standardization of electric components and variations of environmental conditions...
October 13, 2018: Sensors
https://www.readbyqxmd.com/read/30322140/corrugated-photoactive-thin-films-for-flexible-strain-sensor
#6
Donghyeon Ryu, Alfred Mongare
In this study, a flexible strain sensor is devised using corrugated bilayer thin films consisting of poly(3-hexylthiophene) (P3HT) and poly(3,4-ethylenedioxythiophene)-polystyrene(sulfonate) (PEDOT:PSS). In previous studies, the P3HT-based photoactive non-corrugated thin film was shown to generate direct current (DC) under broadband light, and the generated DC voltage varied with applied tensile strain. Yet, the mechanical resiliency and strain sensing range of the P3HT-based thin film strain sensor were limited due to brittle non-corrugated thin film constituents...
October 13, 2018: Materials
https://www.readbyqxmd.com/read/30307950/distinct-virulence-ranges-for-infection-of-mice-by-bordetella-pertussis-revealed-by-engineering-of-the-sensor-kinase-bvgs
#7
Elodie Lesne, Loic Coutte, Luis Solans, Stephanie Slupek, Anne-Sophie Debrie, Véronique Dhennin, Philippe Froguel, David Hot, Camille Locht, Rudy Antoine, Françoise Jacob-Dubuisson
The whooping cough agent Bordetella pertussis coordinately regulates the expression of its virulence factors with the two-component system BvgAS. In laboratory conditions, specific chemical modulators are used to trigger phenotypic modulation of B. pertussis from its default virulent Bvg+ phase to avirulent Bvg- or intermediate Bvgi phases, in which no virulence factors or only a subset of them are produced, respectively. Whether phenotypic modulation occurs in the host remains unknown. In this work, recombinant B...
2018: PloS One
https://www.readbyqxmd.com/read/30307860/in-phase-and-quadrature-analysis-for-amplitude-and-frequency-modulation-due-to-vibrations-on-a-surface-acoustic-wave-resonator
#8
A Maskay, D M Hummels, M Pereira da Cunha
Surface acoustic wave resonators (SAWR) have found widespread usage in various modern consumer radiofrequency (RF) communications electronics, such as cellular phones, wireless devices, GPS devices, frequency control, and sensing applications. External mechanical vibrations modify a SAWR relative dimensions and the substrate's elastic properties, which alter the device's acoustic wave propagation velocity, and ultimately causes the SAWR RF response to change. Detecting vibrations is desirable for dynamic strain, or vibration sensing applications...
October 11, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30300444/advanced-carbon-for-flexible-and-wearable-electronics
#9
REVIEW
Chunya Wang, Kailun Xia, Huimin Wang, Xiaoping Liang, Zhe Yin, Yingying Zhang
Flexible and wearable electronics are attracting wide attention due to their potential applications in wearable human health monitoring and care systems. Carbon materials have combined superiorities such as good electrical conductivity, intrinsic and structural flexibility, light weight, high chemical and thermal stability, ease of chemical functionalization, as well as potential mass production, enabling them to be promising candidate materials for flexible and wearable electronics. Consequently, great efforts are devoted to the controlled fabrication of carbon materials with rationally designed structures for applications in next-generation electronics...
October 9, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30296208/3d-measurements-of-acceleration-induced-brain-deformation-via-harmonic-phase-analysis-and-finite-element-models
#10
Arnold David Gomez, Andrew Knutsen, Fangxu Xing, Deva Chan, Yuan-Chiao Lu, Dzung Pham, Philip V Bayly, Jerry L Prince
OBJECTIVE: To obtain dense spatiotemporal measurements of brain deformation from two distinct but complementary head motion experiments: linear and rotational accelerations. METHODS: This study introduces a strategy for integrating harmonic phase analysis of tagged magnetic resonance imaging (MRI) and finite element models to extract mechanically representative deformation measurements. The method was calibrated using simulated as well as experimental data, demonstrated in a phantom including data with image artifacts, and used to measure brain deformation in human volunteers undergoing rotational and linear acceleration...
October 8, 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/30295015/multifunctional-superelastic-and-lightweight-mxene-polyimide-aerogels
#11
Ji Liu, Hao-Bin Zhang, Xi Xie, Rui Yang, Zhangshuo Liu, Yafeng Liu, Zhong-Zhen Yu
2D transition metal carbides and nitrides (MXenes) have gained extensive attention recently due to their versatile surface chemistry, layered structure, and intriguing properties. The assembly of MXene sheets into macroscopic architectures is an important approach to harness their extraordinary properties. However, it is difficult to construct a freestanding, mechanically flexible, and 3D framework of MXene sheets owing to their weak intersheet interactions. Herein, an interfacial enhancement strategy to construct multifunctional, superelastic, and lightweight 3D MXene architectures by bridging individual MXene sheets with polyimide macromolecules is developed...
October 7, 2018: Small
https://www.readbyqxmd.com/read/30289683/soft-templated-synthesis-of-lightweight-elastic-and-conductive-nanotube-aerogels
#12
Wenlang Liang, Samuel Rhodes, Jianlu Zheng, Xiaochen Wang, Jiyu Fang
Conductive polymer (CP) nanotubes are fascinating nanostructures with high electrical conductivity, fast charge/discharge capability, and high mechanical strength. Despite these attractive physical properties, progress in the synthesis of CP nanotube hydrogels is still limited. Here, we report a facile and effective approach for the synthesis of polypyrrole (PPy) nanotube hydrogels by using the weakly interconnected network of self-assembled nanotubes of lithocholic acid as a soft template. The PPy nanotube hydrogels are then converted to aerogels by freeze drying, in which PPy nanotubes form elastic and conductive networks with a density of 38 mg/cm3 and an electrical conductivity of 1...
October 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30288540/electric-field-control-of-non-volatile-180%C3%A2-switching-of-the-unidirectional-anisotropy-field-in-a-multiferroic-heterostructure
#13
Pingping Li, Cai Zhou, Cuimei Cao, Wenqiang Wang, Changjun Jiang
We investigate the room-temperature, electric-field-mediated, non-volatile 180° switching of the unidirectional anisotropy field in an IrMn/CoFeB/Ta/Pb(Mg1/3Nb2/3)O3-PbTiO3 heterostructure. The variation in exchange bias under different electric fields appears clearly in the magnetic hysteresis loops. The remnant magnetization as a function of electric field, as determined by static magnetic measurements, exhibits a non-volatile behavior, which is consistent with the results of the ferromagnetic resonance field as a function of electric field...
October 17, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30287756/synthesis-and-characterization-of-multi-walled-carbon-nanotube-graphene-nanoplatelet-hybrid-film-for-flexible-strain-sensors
#14
JianRen Huang, Shiuh-Chuan Her, XiaoXiang Yang, MaNan Zhi
Graphene nanoplatelet (GNP) and multi-walled carbon nanotube (MWCNT) hybrid films were prepared with the aid of surfactant Triton X-100 and sonication through a vacuum filtration process. The influence of GNP content ranging from 0 to 50 wt.% on the mechanical and electrical properties was investigated using the tensile test and Hall effect measurement, respectively. It showed that the tensile strength of the hybrid film is decreasing with the increase of the GNP content while the electrical conductivity exhibits an opposite trend...
October 4, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30284440/acid-interface-engineering-of-carbon-nanotube-elastomer-with-enhanced-sensitivity-for-stretchable-strain-sensor
#15
Sijia Chen, Rongyao Wu, Pei Li, Qi Li, Yang Gao, Bo Qian, Fuzhen Xuan
Stretchable strain sensors with high sensitivity or gauge factor (GF), large stretchability, and long-term durability are highly demanded in human motion detection, artificial intelligence, and electronic skins. Nevertheless, to develop high sensitive sensors without sacrifice of stretchability cannot be realized using simple device configurations. In this work, an acid-interface engineering (AIE) method was proposed to develop a stretchable strain sensor with high GF and large stretchability. The AIE generates a layer of SiOx at the interface between carbon nanotube film and Ecoflex, playing a key role in enhancing the sensor's GF...
October 4, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30280559/fabrication-of-strain-gauges-via-contact-printing-a-simple-route-to-healthcare-sensors-based-on-cross-linked-gold-nanoparticles
#16
Bendix Ketelsen, Mazlum Yesilmen, Hendrik Schlicke, Heshmat Noei, Chun-Hao Su, Ying-Chih Liao, Tobias Vossmeyer
In this study we developed a novel and efficient process for the fabrication of resistive strain gauges for healthcare related applications. First, 1,9-nonanedithiol (9DT) cross-linked gold nanoparticle (GNP) films were prepared via layer-by-layer (LbL) spin-coating and subsequently transferred onto flexible polyimide (PI) foil by contact printing. Four point bending tests revealed linear response characteristics with gauge factors of ~14 for 4 nm sized GNPs and ~26 for 7 nm sized GNPs. This dependency of strain sensitivity is attributed to the perturbation of charge carrier tunneling between neighboring GNPs, which becomes more efficient with increasing particle size...
October 3, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30280558/interface-design-strategy-for-the-fabrication-of-highly-stretchable-strain-sensors
#17
Zhen Sang, Kai Ke, Ica Manas-Zloczower
Simultaneously achieving high piezoresistive sensitivity, stretchability and good electrical conductivity in conductive elas-tomer composites (CECs) with carbon nanofillers are crucial for stretchable strain sensor and electrode applications. Here, we report a facile and environmentally-friendly strategy to realize these three goals at once by using branched carbon nano-tubes, also known as carbon nanostructure (CNS). Inspired by the brick-wall structure, a robust segregated conductive net-work of CNS is formed in the thermoplastic polyurethane (TPU) matrix at very low filler fraction, which renders the compo-site very good electrical, mechanical and piezoresistive properties...
October 3, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30276409/ultra-sensitive-microfluidic-wearable-strain-sensor-for-intraocular-pressure-monitoring
#18
Sevda Agaoglu, Priscilla Diep, Matthew Martini, Samudhyatha Kt, Murat Baday, I Emre Araci
Wearable technologies have potential to transform healthcare by providing continuous measurements of physiological parameters. Sensors that passively monitor physiological pressure without using electronic components are ideal for wearable contact lenses because they are easy to interface with the cornea and the external environment. Here, we report a passive integrated microfluidic sensor with a novel transduction mechanism that converts small strain changes into a large fluidic volume expansion, detectable by a smart-phone camera...
October 2, 2018: Lab on a Chip
https://www.readbyqxmd.com/read/30275914/bimorph-piezoelectric-vibration-energy-harvester-with-flexible-3d-meshed-core-structure-for-low-frequency-vibration
#19
Takuya Tsukamoto, Yohei Umino, Sachie Shiomi, Kou Yamada, Takaaki Suzuki
This paper proposes a bimorph piezoelectric vibration energy harvester (PVEH) with a flexible 3D meshed-core elastic layer for improving the output power while lowering the resonance frequency. Owing to the high void ratio of the 3D meshed-core structure, the bending stiffness of the cantilever can be lowered. Thus, the deflection of the harvester and the strain in the piezoelectric layer increase. According to vibration tests, the resonance frequency is 15.8% lower and the output power is 68% higher than in the conventional solid-core PVEH...
2018: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/30275367/highly-integrated-all-fiber-fp-fbg-sensor-for-accurate-measurement-of-strain-under-high-temperature
#20
Tingting Yang, Xiu He, Zengling Ran, Zhendong Xie, Yunjiang Rao, Xueguang Qiao, Zhengxi He, Peng He
Accurate measurement of strain is one of the most important issues for high temperature environments. We present a highly integrated all-fiber sensor to achieve precise measurements of strain/high-pressure, which consists of a fiber Bragg grating (FBG) inscribed by an 800 nm femtosecond laser cascaded with a micro extrinsic Fabry⁻Perot (FP) cavity fabricated by the 157 nm laser micromachining technique. FBG is sensitive to temperature, but insensitive to strain/pressure, whereas the FP is sensitive to strain/pressure, but has a small dependence on temperature...
October 1, 2018: Materials
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