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https://www.readbyqxmd.com/read/28935942/oxygen-evolution-reaction-dynamics-monitored-by-an-individual-nanosheet-based-electronic-circuit
#1
Peiyao Wang, Mengyu Yan, Jiashen Meng, Gengping Jiang, Longbing Qu, Xuelei Pan, Jefferson Zhe Liu, Liqiang Mai
The oxygen evolution reaction involves complex interplay among electrolyte, solid catalyst, and gas-phase and liquid-phase reactants and products. Monitoring catalysis interfaces between catalyst and electrolyte can provide valuable insights into catalytic ability. But it is a challenging task due to the additive solid supports in traditional measurement. Here we design a nanodevice platform and combine on-chip electrochemical impedance spectroscopy measurement, temporary I-V measurement of an individual nanosheet, and molecular dynamic calculations to provide a direct way for nanoscale catalytic diagnosis...
September 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28934795/comparisons-of-lesion-volumes-and-shapes-produced-by-a-radiofrequency-system-with-a-cooled-a-protruding-or-a-monopolar-probe
#2
David L Cedeno, Alejandro Vallejo, Courtney A Kelley, Dana M Tilley, Nitesh Kumar
BACKGROUND: Radiofrequency (RF) ablation for denervation has been utilized for decades in chronic pain management. This relies on the proper targeting of the affected nerve which may be obtained by creating an ablation lesion with a shape and volume that optimizes targeting. Various systems designed to improve lesion size are available. These include cooling the active tip (cooled-RF) and protruding the RF electrode outside the active tip (PERF). OBJECTIVES: This study compares lesion volumes of 3 commercially available RF systems: cooled-RF, "V" shaped active cannula and protruding electrode (18 g and 20 g), and monopolar RF (MRF; 16 g, 18 g, and 20 g)...
September 2017: Pain Physician
https://www.readbyqxmd.com/read/28933353/technical-solutions-for-simultaneous-meg-and-seeg-recordings-towards-routine-clinical-use
#3
J M Badier, A S Dubarry, M Gavaret, S Chen, A S Trébuchon, P Marquis, J Régis, F Bartolomei, C G Bénar, R Carron
OBJECTIVE: The simultaneous recording of intracerebral EEG (stereotaxic EEG, SEEG) and magnetoencephalography (MEG) is a promising strategy that provides both local and global views on brain pathological activity. Yet, acquiring simultaneous signals poses difficult technical issues that hamper their use in clinical routine. Our objective was thus to develop a set of solutions for recording a high number of SEEG channels while preserving signal quality. APPROACH: We recorded data in a patient with drug resistant epilepsy during presurgical evaluation...
September 21, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28924008/primary-generators-of-visually-evoked-field-potentials-recorded-in-the-macaque-auditory-cortex
#4
Yoshinao Kajikawa, John F Smiley, Charles E Schroeder
Prior studies have reported "local" field potential (LFP) responses to faces in the macaque auditory cortex and have suggested that such face-LFPs may be substrates of audiovisual integration. However, while field potentials (FPs) may reflect the synaptic currents of neurons near the recording electrode, due to the use of a distant reference electrode, they often reflect those of synaptic activity occurring in distant sites as well. Thus, FP recordings within a given brain region (e.g., auditory cortex) may be "contaminated" by activity generated elsewhere in the brain...
September 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28898173/utility-of-stereoelectroencephalography-in-children-with-dysembryoplastic-neuroepithelial-tumor-and-cortical-malformation
#5
Jun T Park, Guadalupe Fernandez Baca Vaca, Jennifer Avery, Jonathan P Miller
BACKGROUND: Uncontrolled seizures in children can contribute to irreversible cognitive impairment and developmental delay, in addition to placing them at risk for sudden unexplained death in epileptic patients (SUDEP). Since its introduction at Saint Ann Hospital in Paris in the 1960s, stereoelectroencephalography (SEEG) is increasingly being utilized at epilepsy centers in the United States as an invasive tool to help localize the seizure focus in drug-resistant focal epilepsy. INDICATIONS: Children with symptomatic epilepsy, commonly due to cortical dysplasia and dysembryoplastic neuroepithelial tumor (DNET), may benefit from SEEG investigation...
2017: Neurodiagnostic Journal
https://www.readbyqxmd.com/read/28894813/the-importance-of-electrode-location-in-cochlear-implantation
#6
REVIEW
Brendan P O'Connell, Jacob B Hunter, George B Wanna
OBJECTIVES: As indications for cochlear implantation have expanded to include patients with more residual hearing, increasing emphasis has been placed on minimally traumatic electrode insertion. Histopathologic evaluation remains the gold standard for evaluation of cochlear trauma, but advances in imaging techniques have allowed clinicians to determine scalar electrode location in vivo. This review will examine the relationship between scalar location of electrode arrays and audiologic outcomes...
December 2016: Laryngoscope Investigative Otolaryngology
https://www.readbyqxmd.com/read/28894243/high-capacitance-hybrid-supercapacitor-based-on-multi-colored-fluorescent-carbon-dots
#7
Rukan Genc, Melis Ozge Alas, Ersan Harputlu, Sergej Repp, Nora Kremer, Mike Castellano, Suleyman Gokhan Colak, Kasim Ocakoglu, Emre Erdem
Multi-colored, water soluble fluorescent carbon nanodots (C-Dots) with quantum yield changing from 4.6 to 18.3% were synthesized in multi-gram using dated cola beverage through a simple thermal synthesis method and implemented as conductive and ion donating supercapacitor component. Various properties of C-Dots, including size, crystal structure, morphology and surface properties along with their Raman and electron paramagnetic resonance spectra were analyzed and compared by means of their fluorescence and electronic properties...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28893929/distinct-patterns-of-temporal-and-directional-connectivity-among-intrinsic-networks-in-the-human-brain
#8
James M Shine, Aaron Kucyi, Brett L Foster, Stephan Bickel, Danhong Wang, Hesheng Liu, Russell A Poldrack, Liang-Tien Hsieh, Jen Chun Hsiang, Josef Parvizi
To determine the spatiotemporal relationships among intrinsic networks of the human brain, we recruited seven neurosurgical patients (4 males; 3 females) who were implanted with intracranial depth electrodes. We first identified canonical resting state networks at the individual subject level using an iterative matching procedure on each subject's resting state fMRI data. We then introduced single electrical pulses to fMRI pre-identified nodes of the default (DN), frontoparietal (FPN) and salience networks (SN) while recording evoked responses in other recording sites within the same networks...
September 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28886067/a-wireless-soil-moisture-sensor-powered-by-solar-energy
#9
Mingliang Jiang, Mouchao Lv, Zhong Deng, Guoliang Zhai
In a variety of agricultural activities, such as irrigation scheduling and nutrient management, soil water content is regarded as an essential parameter. Either power supply or long-distance cable is hardly available within field scale. For the necessity of monitoring soil water dynamics at field scale, this study presents a wireless soil moisture sensor based on the impedance transform of the frequency domain. The sensor system is powered by solar energy, and the data can be instantly transmitted by wireless communication...
2017: PloS One
https://www.readbyqxmd.com/read/28884492/patterned-semiconductor-structures-modulate-neuronal-outgrowth-implication-for-the-development-of-a-neuro-bionic-interface
#10
Johannes Völker, Fabian Kohm, Lukas Jürgens, Agmal Scherzad, Philipp Schendzielorz, Sebastian Schraven, Robert Mlynski, Andreas Radeloff, Rudolf Hagen, Kristen Rak
Auditory implants stimulate the neurons by broad electrical fields, which leads to a low number of spectral channels. A reduction in the distance between the electrode and the neuronal structures might lead to better electrical transduction. The use of microstructured semiconductors offers a large number of contacts, which could attract neurons and stimulate them individually. To investigate the interaction between neurons and semiconductors, differentiated neuronal precursor cells were cultured on silicon wafers...
September 7, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28882607/efficacy-and-safety-in-frameless-robot-assisted-stereo-electroencephalography-seeg-for-drug-resistant-epilepsy
#11
I Ollivier, C Behr, H Cebula, A Timofeev, M Benmekhbi, M P Valenti, A M Staack, J Scholly, P Kehrli, E Hirsch, F Proust
INTRODUCTION: Stereo-electroencephalography (SEEG) is an invasive procedure, used to identify the epileptogenic zone that can be surgically removed in order to treat drug-resistant epilepsy. Frameless robot-assisted positioning of depth electrodes permits a 3D approach with different obliquities and trajectories. The objective of the present study was to evaluate the morbidity and the accuracy related to this frameless procedure. PATIENTS AND METHODS: Sixty-six patients were managed wherein 901 electrodes were implanted during a 6-year-period...
September 4, 2017: Neuro-Chirurgie
https://www.readbyqxmd.com/read/28877395/optimal-lead-positioning-in-sacral-neuromodulation-which-factors-are-related-to-treatment-outcome
#12
Ranjana Jairam, Tom Marcelissen, Gommert van Koeveringe, Philip van Kerrebroeck
OBJECTIVES: Sacral neuromodulation (SNM) is a well-established treatment for overactive bladder (OAB) and non-obstructive urinary retention (NOR). During test stimulation, the lead is positioned along the third sacral nerve, which ideally results in a response in all four contact points (active electrodes). However, it is unclear whether the position of the lead (depth, angle, deflection) and the number of active electrodes is related to the outcome of SNM. METHODS: All patients who underwent test stimulation using the tined lead between January 2011 and September 2016 were included in this retrospective study...
September 6, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28876341/interfacial-engineering-of-hole-transport-layers-with-metal-and-dielectric-nanoparticles-for-efficient-perovskite-solar-cells
#13
Dian Wang, Kah H Chan, Naveen Kumar Elumalai, Md Arafat Mahmud, Mushfika B Upama, Ashraf Uddin, Supriya Pillai
In this work, we have demonstrated the incorporation of metal (Ag NPs) and dielectric nanoparticles (SiO2 NPs) into the hole transporting layers of inverted PSCs using facile deposition methods. Interfacial engineering in PSCs is accomplished by incorporating 50 nm Ag NPs or SiO2 NPs within the PEDOT:PSS interlayer. Dielectric SiO2 NPs were used for comparison purposes as a control sample to isolate morphological impacts without plasmonic effects. The photovoltaic performance of the devices significantly improved due to increased charge selectivity and enhanced charge collection properties across the interface (HTL)...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28871792/one-pot-synthesis-of-nickel-modified-carbon-nitride-layers-toward-efficient-photoelectrochemical-cells
#14
Wenyao Zhang, Josep Albero, Lifei Xi, Kathrin Maria Lange, Hermenegildo Garcia, Xin Wang, Menny Shalom
A new method to significantly enhance the photoelectrochemical properties of phenyl-modified carbon nitride layers via the insertion of nickel ions into carbon nitride layers is reported. The nickel ions are embedded within the carbon nitride layers by manipulating the interaction of Ni ions and molten organic molecules at elevated temperature, prior their condensation. A detailed analysis of the chemical and photophysical properties suggests that the nickel ions dissolve in the molten molecules leading to homogeneous distribution of nickel atoms within the carbon nitride layers...
September 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28871419/thalamic-and-basal-ganglia-regions-are-involved-in-attentional-processing-of-behaviorally-significant-events-evidence-from-simultaneous-depth-and-scalp-eeg
#15
Anne-Kathrin Beck, Götz Lütjens, Kerstin Schwabe, Reinhard Dengler, Joachim K Krauss, Pascale Sandmann
Extensive descriptions exist on cortical responses to change in the acoustic environment. However, the involvement of subcortical regions is not well understood. Here we present simultaneous recordings of cortical and subcortical event-related potentials (ERPs) to different pure tones in patients undergoing surgery for deep brain stimulation (DBS). These patients had externalized electrodes in the subthalamic nucleus (STN), the ventrolateral posterior thalamus (VLp) or the globus pallidus internus (GPi). Subcortical and cortical ERPs were analyzed upon presentation of one frequent non-target stimulus and two infrequent stimuli, either being a target or a distractor stimulus...
September 4, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28841996/disposable-sputtered-bismuth-screen-printed-sensors-for-voltammetric-monitoring-of-cadmium-and-lead-in-atmospheric-particulate-matter-samples
#16
M R Palomo-Marín, F Rueda-Holgado, J Marín-Expósito, E Pinilla-Gil
We report here the use of commercial screen-printed disposable sensors comprising a sputtered bismuth working electrode, a silver pseudo reference electrode and a carbon auxiliary electrode (whole set referred as BispSPE), as a new and advantageous alternative for reliable and convenient monitoring of Cd and Pb in atmospheric particulate matter (PM10 fraction) by anodic stripping voltammetry after acid digestion. After a detailed exploration of surface composition and depth profiles of the BispSPE by SEM, EDX, XPS and EIS, chemical and instrumental variables have been optimized to develop a reliable method capable of measuring Cd and Pb with detection limits of 11...
December 1, 2017: Talanta
https://www.readbyqxmd.com/read/28841281/formation-and-characterization-of-dendritic-interfacial-electrodes-inside-an-ionomer
#17
Yanjie Wang, Jiayu Liu, Yetao Zhu, Denglin Zhu, Hualing Chen
Formation of dendritic interfacial electrodes (DIEs) between metal/polymer interfaces has high demands in a variety of areas. By combining impregnation electroplating (IEP) step with impregnation-reduction (IR) step under straightforward conditions, we report a novel method of preparation of dendritic interfacial metal electrodes of palladium, platinum, silver and copper inside an ionomer for ionic polymer-metal composites (IPMC) application. The depth of palladium DIEs can be controlled by adjusting the reaction time, and the maximum depth can almost reach up to contact from the both sides of ionomer with a total thickness of 200 μm...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28827712/copper-ferrites-reduced-graphene-oxide-anode-materials-for-advanced-lithium-storage-applications
#18
Junyong Wang, Qinglin Deng, Mengjiao Li, Kai Jiang, Jinzhong Zhang, Zhigao Hu, Junhao Chu
Copper ferrites are emerging transition metal oxides that have potential applications in energy storage devices. However, it still lacks in-depth designing of copper ferrites based anode architectures with enhanced electroactivity for lithium-ion batteries. Here, we report a facile synthesis technology of copper ferrites anchored on reduced graphene oxide (CuFeO2@rGO and Cu/CuFe2O4@rGO) as the high-performance electrodes. In the resulting configuration, reduced graphene offers continuous conductive channels for electron/ion transfer and high specific surface area to accommodate the volume expansion of copper ferrites...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28827338/in-situ-nano-to-microscopic-imaging-and-growth-mechanism-of-electrochemical-dissolution-e-g-corrosion-of-a-confined-metal-surface
#19
C Merola, H-W Cheng, K Schwenzfeier, K Kristiansen, Y-J Chen, H A Dobbs, J N Israelachvili, M Valtiner
Reactivity in confinement is central to a wide range of applications and systems, yet it is notoriously difficult to probe reactions in confined spaces in real time. Using a modified electrochemical surface forces apparatus (EC-SFA) on confined metallic surfaces, we observe in situ nano- to microscale dissolution and pit formation (qualitatively similar to previous observation on nonmetallic surfaces, e.g., silica) in well-defined geometries in environments relevant to corrosion processes. We follow "crevice corrosion" processes in real time in different pH-neutral NaCl solutions and applied surface potentials of nickel (vs...
August 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28800213/dynamics-of-additive-migration-to-form-cathodic-interlayers-in-organic-solar-cells
#20
Jane Vinokur, Stas Obuchovsky, Igal Deckman, Lishai Shoham, Tom Mates, Michael L Chabinyc, Gitti L Frey
Migration of additives to organic/metal interfaces can be used to self-generate interlayers in organic electronic devices. To generalize this approach for various additives, metals, and organic electronic devices it is first necessary to study the dynamics of additive migration from the bulk to the top organic/metal interface. In this study, we focus on a known cathode interlayer material, polyethylene glycol (PEG), as additive in P3HT:PC71BM blends and study its migration to the blend/Al interface during metal deposition and its effect on organic solar cell (OSC) performance...
August 24, 2017: ACS Applied Materials & Interfaces
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