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https://www.readbyqxmd.com/read/28231010/generation-of-anisotropic-massless-dirac-fermions-and-asymmetric-klein-tunneling-in-few-layer-black-phosphorus-superlattices
#1
Zhenglu Li, Ting Cao, Meng Wu, Steven G Louie
Artificial lattices have been employed in a broad range of two-dimensional systems, including those with electrons, atoms and photons, in the quest for massless Dirac fermions with high flexibility and controllability. Establishing triangular or hexagonal symmetry, from periodically patterned molecule assembly or electrostatic gating as well as from moiré pattern induced by substrate, has produced electronic states with linear dispersions from two-dimensional electron gas (2DEG) residing in semiconductors, metals and graphene...
February 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28230918/single-crystal-flexible-electronics-enabled-by-3d-spalling
#2
Ning Li, Stephen Bedell, Huan Hu, Shu-Jen Han, Xiao Hu Liu, Katherine Saenger, Devendra Sadana
Flexible and stretchable electronics are becoming increasingly important in many emerging applications. Due to the outstanding electrical properties of single crystal semiconductors, there is great interest in releasing single crystal thin films and fabricating flexible electronics with these conventionally rigid materials. In this study the authors report a universal single crystal layer release process, called "3D spalling," extending beyond prior art. In contrast to the conventional way of removing blanket layers from their substrates, the new process reported here enables 3D control over the shape and thickness of the removed regions, allowing direct formation of arbitrarily shaped structures of released film and locally specified thickness for each region...
February 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28230082/tubz-filament-assembly-dynamics-requires-the-flexible-c-terminal-tail
#3
Maria E Fuentes-Pérez, Rafael Núñez-Ramírez, Alejandro Martín-González, David Juan-Rodríguez, Oscar Llorca, Fernando Moreno-Herrero, Maria A Oliva
Cytomotive filaments are essential for the spatial organization in cells, showing a dynamic behavior based on nucleotide hydrolysis. TubZ is a tubulin-like protein that functions in extrachromosomal DNA movement within bacteria. TubZ filaments grow in a helical fashion following treadmilling or dynamic instability, although the underlying mechanism is unclear. We have unraveled the molecular basis for filament assembly and dynamics combining electron and atomic force microscopy and biochemical analyses. Our findings suggest that GTP caps retain the filament helical structure and hydrolysis triggers filament stiffening upon disassembly...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28227955/cmos-based-opto-electronic-neural-interface-devices-for-optogenetics
#4
Takashi Tokuda, Satoki Noguchi, Satoru Iwasaki, Hiroaki Takehara, Toshihiko Noda, Kiyotaka Sasagawa, Jun Ohta, Takashi Tokuda, Satoki Noguchi, Satoru Iwasaki, Hiroaki Takehara, Toshihiko Noda, Kiyotaka Sasagawa, Jun Ohta, Toshihiko Noda, Kiyotaka Sasagawa, Satoru Iwasaki, Takashi Tokuda, Satoki Noguchi, Hiroaki Takehara, Jun Ohta
CMOS-based opto-electronic neural interface devices are presented. The devices are designed with target application of in vitro and in vivo optogenetics. Two types of the opto-electronic neural interface devices are presented. One is single-chip type device for on-chip optogenetics, and the other is multi-chip type device with flexibility and wide-area coverage for in vivo optogenetics on brain. Design, packaging and functional evaluations are presented.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227497/a-wireless-system-with-stimulation-and-recording-capabilities-for-interfacing-peripheral-nerves-in-rodents
#5
P Schonle, F Michoud, N Brun, A Guex, S P Lacour, Q Wang, Q Huang, P Schonle, F Michoud, N Brun, A Guex, S P Lacour, Q Wang, Q Huang, N Brun, A Guex, P Schonle, Q Huang, Q Wang, S P Lacour, F Michoud
Considerable progress has been made in the last decade in implantable bioelectronic neurosystems. Yet most neural implants are used in acute and tethered experimental conditions. Here, we present a preliminary prototype of a multichannel system for simultaneous peripheral nerve stimulation and neural recording. The system comprises miniaturized electronics with a total volume of less then 1.4cm(3) including a 3.7V battery which is expected to last for 94 days of standby operation or 18 hours of continuous recording and stimulation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226456/hydrogel-reinforced-polypyrrole-electroactuator
#6
Yongchen Wang, Bingxi Yan, Yu Wu, Liang Guo, Yongchen Wang, Bingxi Yan, Yu Wu, Liang Guo, Yongchen Wang, Liang Guo, Bingxi Yan, Yu Wu
Robust electroactuators that are lightweight, power-efficient and capable of generating high forces at a low actuation voltage are of great demand in the design of micro-electromechanical systems (MEMS) for biomedical applications. In this work, electroactive composite films of alginate hydrogel and polypyrrole/polyethylene glycol (PPy/PEG) are synthesized and characterized as actuators for driving an implantable insulin micropump. A porous and flexible alginate hydrogel back layer is used to mechanically reinforce the PPy/PEG film by enhancing the actuator's resistance to its generated tension but without increase of its overall rigidness...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225354/electrospun-assembly-a-nondestructive-nanofabrication-for-transparent-photosensors
#7
Yuting Wang, Muhammad Shahid, Jing Cheng, Hiroki Nishijima, Wei Pan
Transparent electrodes based on a metal nanotrough network show superior electrical and optical properties. However, most metal networks fabricated by electrospinning are formed as film electrodes and hard to be patterned for the geometry shape of the device without any loss. Herein, we fabricate a high-transparent and flexible photodetector via a simple controlled electrospinning method. Owning to its trough- and belt-like geometry of Pt network electrodes, up to 83% transmittance can be obtained when the sheet resistances is 16Ω/sq, which may be the best performance for Pt-based transparent electrodes at present...
February 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28222689/family-centred-interventions-by-primary-healthcare-services-for-indigenous-early-childhood-wellbeing-in-australia-canada-new-zealand-and-the-united-states-a-systematic-scoping-review
#8
Janya McCalman, Marion Heyeres, Sandra Campbell, Roxanne Bainbridge, Catherine Chamberlain, Natalie Strobel, Alan Ruben
BACKGROUND: Primary healthcare services in Australia, Canada, New Zealand and the United States have embraced the concept of family-centred care as a promising approach to supporting and caring for the health of young Indigenous children and their families. This scoping review assesses the quality of the evidence base and identifies the published literature on family- centred interventions for Indigenous early childhood wellbeing. METHODS: Fourteen electronic databases, grey literature sources and the reference lists of Indigenous maternal and child health reviews were searched to identify relevant publications from 2000 to 2015...
February 21, 2017: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/28222258/a-simple-and-large-scale-strategy-to-prepare-flexible-graphene-tape-electrode
#9
Li Wang, Jie Yu, Yayun Zhang, Han Yang, Longfei Miao, Yonghai Song
A simple and large-scale strategy to prepare flexible graphene tape electrode (GTE) was proposed. The flexible GTE was prepared by a facile peeling method in which a piece of commercial graphite foil was firstly covered by a commercial acrylic transparent tape and then the transparent adhesive tape was quickly torn off from the graphite foil. Scanning electron microscopy results showed that some folded and wrinkled graphene layers stood up on the GTE surface to form three-dimensional (3D) porous graphene foam...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221812/intermicellar-interactions-and-the-viscoelasticity-of-surfactant-solutions-complementary-use-of-sans-and-saxs
#10
Viviane Lutz-Bueno, Marianne Liebi, Joachim Kohlbrecher, Peter Fischer
In ionic surfactant micelles, basic interactions among distinct parts of surfactant monomers, their counterion, and additives are fundamental to tune molecular self-assembly and enhance viscoelasticity. Here, we investigate the addition of sodium salicylate (NaSal) to hexa-decyltrimethyl ammonium chloride and bromide (CTAC and CTAB) and 1-hexa-decyl pyridinium chloride and bromide (CPyCl and CPyBr), which have distinct counterions and headgroup structures, but the same hydrophobic tail. Different contrasts are obtained from small-angle neutron scattering SANS, which probes differences between the nucleus of atoms, and X-rays SAXS, which probes differences in electron density...
February 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28221755/multilevel-ultra-fast-flexible-nanoscale-non-volatile-hybrid-graphene-oxide-titanium-oxide-memories
#11
V Karthik Nagareddy, Matthew D Barnes, Federico Zipoli, Khue T Lai, Arseny M Alexeev, Monica Felicia Craciun, C David Wright
Graphene oxide (GO) resistive memories offer the promise of low-cost environmentally-sustainable fabrication, high mechanical flexibility and high optical transparency, making them ideally suited to future flexible and transparent electronics applications. However, the dimensional and temporal scalability of GO memories, i.e. how small they can be made and how fast they can be switched, is an area that has received scant attention. Moreover, a plethora of GO resistive switching characteristics and mechanisms has been reported in the literature, sometimes leading to a confusing and conflicting picture...
February 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28221350/controlling-quantum-beating-signals-in-2d-electronic-spectra-by-packing-synthetic-heterodimers-on-single-walled-carbon-nanotubes
#12
Lili Wang, Graham B Griffin, Alice Zhang, Feng Zhai, Nicholas E Williams, Richard F Jordan, Gregory S Engel
In multidimensional spectroscopy, dynamics of coherences between excited states report on the interactions between electronic states and their environment. The prolonged coherence lifetimes revealed through beating signals in the spectra of some systems may result from vibronic coupling between nearly degenerate excited states, and recent observations confirm the existence of such coupling in both model systems and photosynthetic complexes. Understanding the origin of beating signals in the spectra of photosynthetic complexes has been given considerable attention; however, strategies to generate them in artificial systems that would allow us to test the hypotheses in detail are still lacking...
February 21, 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28218920/a-non-volatile-organic-electrochemical-device-as-a-low-voltage-artificial-synapse-for-neuromorphic-computing
#13
Yoeri van de Burgt, Ewout Lubberman, Elliot J Fuller, Scott T Keene, Grégorio C Faria, Sapan Agarwal, Matthew J Marinella, A Alec Talin, Alberto Salleo
The brain is capable of massively parallel information processing while consuming only ∼1-100 fJ per synaptic event. Inspired by the efficiency of the brain, CMOS-based neural architectures and memristors are being developed for pattern recognition and machine learning. However, the volatility, design complexity and high supply voltages for CMOS architectures, and the stochastic and energy-costly switching of memristors complicate the path to achieve the interconnectivity, information density, and energy efficiency of the brain using either approach...
February 20, 2017: Nature Materials
https://www.readbyqxmd.com/read/28218728/compliment-graphene-oxide-coating-on-silk-fiber-surface-via-electrostatic-force-for-capacitive-humidity-sensor-applications
#14
Kook In Han, Seungdu Kim, In Gyu Lee, Jong Pil Kim, Jung-Ha Kim, Suck Won Hong, Byung Jin Cho, Wan Sik Hwang
Cylindrical silk fiber (SF) was coated with Graphene oxide (GO) for capacitive humidity sensor applications. Negatively charged GO in the solution was attracted to the positively charged SF surface via electrostatic force without any help from adhesive intermediates. The magnitude of the positively charged SF surface was controlled through the static electricity charges created on the SF surface. The GO coating ability on the SF improved as the SF's positive charge increased. The GO-coated SFs at various conditions were characterized using an optical microscope, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Raman spectroscopy, and LCR meter...
February 19, 2017: Sensors
https://www.readbyqxmd.com/read/28214733/flexible-camphor-diamond-like-carbon-coating-on-polyurethane-to-prevent-candida-albicans-biofilm-growth
#15
Thaisa B Santos, Angela A Vieira, Luciana O Paula, Everton D Santos, Polyana A Radi, Sônia Khouri, Homero S Maciel, Rodrigo S Pessoa, Lucia Vieira
Camphor was incorporated in diamond-like carbon (DLC) films to prevent the Candida albicans yeasts fouling on polyurethane substrates, which is a material commonly used for catheter manufacturing. The camphor:DLC and DLC film for this investigation was produced by plasma enhanced chemical vapor deposition (PECVD), using an apparatus based on the flash evaporation of organic liquid (hexane) containing diluted camphor for camphor:DLC and hexane/methane, mixture for DLC films. The film was deposited at a low temperature of less than 25°C...
February 16, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28213127/quantitation-of-lead-210-210-pb-using-lead-203-203-pb-as-a-massless-yield-tracer
#16
D May, A N Nelson, M K Schultz
Determination of Pb-210 ((210)Pb) in aqueous solution is a common radioanalytical challenge in environmental science. Widely used methods for undertaking these analyses (e.g., ASTM D7535) rely on the use of stable lead (Pb) as a yield tracer that takes into account losses of (210)Pb that inevitably occur during elemental/radiochemical separations of the procedures. Although effective, these methods introduce technical challenges that can be difficult to track and potentially introduce uncertainty that can be difficult to quantify...
February 14, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28212601/feasibility-of-identifying-out-of-care-hiv-positive-patients-in-a-hospital-setting-and-enrolling-them-in-a-retention-intervention
#17
Jessica A Davila, Christine Hartman, Jeffrey Cully, Melinda Stanley, K Rivet Amico, Elizabeth Soriano, Sophie Minick, Sarah B May, Thomas P Giordano
BACKGROUND: The hospital setting provides an opportunity to re-engage people living with HIV (PLWH) in HIV care. We developed and implemented a protocol to identify PLWH in a hospital setting. The aim of the current study was to report on our strategy to recruit hospitalized HIV patients into an intervention study, and to report on lessons learned for future studies. METHODS: Our protocol was developed based on experience of our research staff in recruiting HIV patients as well as clinical input from providers and administrators on delivering care in hospitalized settings...
February 17, 2017: HIV Clinical Trials
https://www.readbyqxmd.com/read/28212488/graphene-oxide-glue-electrode-for-fabrication-of-vertical-elastic-conductive-columns
#18
Liusi Yang, Mingchu Zou, Shiting Wu, Wenjing Xu, Huaisheng Wu, Anyuan Cao
Graphene has a planar atomic structure with high flexibility, and might be used as ultra-thin conductive glues or adhesion layers in electronics and other applications. Here, we show that graphene oxide (GO) sheets condensed from solution can act as a pure, thin-layer, non-penetrating glue for fabrication of vertical architectures anchored on rigid and flexible substrates. Carbon nanotube (CNT) sponges are used as a porous template to make polymer-reinforced composite columns, to achieve both high conductivity and elastic behavior...
February 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28211923/electrical-and-photocatalytic-properties-of-boron-doped-zno-nanostructure-grown-on-pet-ito-flexible-substrates-by-hydrothermal-method
#19
Wei Wang, Taotao Ai, Qi Yu
Boron-doped zinc oxide sheet-spheres were synthesized on PET-ITO flexible substrates using a hydrothermal method at 90 °C for 5 h. The results of X-ray diffraction and X-ray photoelectron spectroscopy indicated that the B atoms were successfully doped into the ZnO lattice, the incorporation of B led to an increase in the lattice constant of ZnO and a change in its internal stress. The growth mechanism of pure ZnO nanorods and B-doped ZnO sheet-spheres was specifically investigated. The as-prepared BZO/PET-ITO heterojunction possessed obvious rectification properties and its positive turn-on voltage was 0...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28208249/flexible-passive-near-field-communication-tag-for-multigas-sensing
#20
P Escobedo, M M Erenas, N López-Ruiz, M A Carvajal, S Gonzalez-Chocano, I de Orbe-Payá, L F Capitán-Valley, A J Palma, A Martínez-Olmos
In this work we present a full-passive flexible multigas sensing tag for the determination of oxygen, carbon dioxide, ammonia, and relative humidity readable by a smartphone. This tag is based on near field communication (NFC) technology for energy harvesting and data transmission to a smartphone. The gas sensors show an optic response that is read through high-resolution digital color detectors. A white LED is used as the common optical excitation source for all the sensors. Only a reduced electronics with very low power consumption is required for the reading of the optical responses and data transmission to a remote user...
February 7, 2017: Analytical Chemistry
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