Hierarchical porous carbons (HPCs) for supercapacitors were synthesized from coal tar pitch using nano-sized γ-Fe2O3 as a template and activation agent coupled with KOH by conventional microwave heating. The HPCs characterized scanning electron microscopy, transmission N2 adsorption X-ray diffraction techniques. results show that the specific surface area (SBET) of is tunable, increases 761 m2 g−1 to 1330 mass ratio in mixture. reduced Fe3O4, FeO, Fe reaction step. carbon dioxide generated...

Abstract Electrocatalytic alkynes semi-hydrogenation to produce alkenes with high yield and Faradaic efficiency remains technically challenging because of kinetically favorable hydrogen evolution reaction over-hydrogenation. Here, we propose a hierarchically nanoporous Cu 50 Au alloy improve electrocatalytic performance toward alkynes. Using Operando X-ray absorption spectroscopy density functional theory calculations, find that modulate the electronic structure Cu, which could intrinsically...

Abstract Objective . A novel flexible hydrogel electrode with a strong moisturizing ability was prepared for long-term electroencephalography (EEG) monitoring. Approach The synthesized by polymerizing the N-acryloyl glycinamide monomer. And proper amount of glycerin added to increase moisture retention electrodes. shows high mechanical properties, and liquid in produces hydrating effect on skin stratum corneum, which could decrease contact impedance between electrode. In addition,...

The increasing quality and availability of low-cost EEG systems offer new possibilities for non-medical purposes. Existing openly available algorithms to assess the user's mental state in real-time have been mainly performed with medical-grade equipment. In this paper, an approach Focus or Relax states using a consumer-grade, wearable headband is evaluated. One naive measure four entropy-based measures, computed relative frequency band powers signal, were introduced. Classifiers relax focus...

In this paper, we present a novel soft bristle-shaped semi-dry electrode for electroencephalography (EEG) recording. Because the structure with electric conductivity could overcome obstacle of hair and enable direct connection to scalp, work drinking water instead saline that was widely used in previous or electrodes improve its convenience. The consisted conductive bristles 3D-printed casing. Carbon-coated nylon achieve low impedance properties electrode. spread on skin realize larger...

Electroencephalography (EEG) equipment and data analysis algorithms have made great progress in the field of brain-computer interfaces (BCIs). However, development EEG electrodes that directly contact with users is relatively slow, especially daily monitoring. The installation procedure wet widely used hospitals clinics complicated, largely limiting its application family. Herein, we report a fully flexible hydrogel electrode for materials are all flexible, making it suitable curvature skin,...

The development of flexible pressure sensors for monitoring human motion and physiological signals has attracted extensive scientific research. However, achieving low limits, a wide detection range, large bending stresses, excellent mechanical stability simultaneously remains serious challenge. With the aim developing high-performance capacitive sensor (CPS), this paper introduces successful preparation single-walled carbon nanotube (SWNT)/polydimethylsiloxane (S-PDMS) composite dielectric...

In this paper, we designed a multifunction wearable sensor for detecting electroencephalogram (EEG) and sweat rate simultaneously. Conductive fabric electrode was combined on the EEG signal measurement. The conductive material metallic Ag, which has low contact impedance noise. connected to an recording module, based ADS1299 converter. There were 8 channels module. One of other 7 could be independent electrodes. Because gaps between fibers, record signals while allowing permeate through it....

Clinically, an excellent electrode is of great significance for obtaining high-fidelity electroencephalogram (EEG) signals, which a valuable tool diagnosing brain-related diseases and exploring human brain activity. However, traditional wet encounters natural drawback in moisturizing ability due to the lack water-locking electrolyte, unsuitable long-term EEG acquisition. Hence, we propose gelatin-based ionic conductive hydrogel with high wearable The gelatin material, derived mainly from...

Photoactuated liquid crystalline elastomer (LCE) materials are gaining much attention in many application fields, but challenges for the precise modulation of their photoresponses still exist. Researchers have explored various optical parameters, such as polarization, intensity, and wavelength, to obtain differential responses. The development photoactuated LCE with wavelength-selective responsiveness is more versatile has attracted interest, commonly prepared by incorporating different...

Abstract Objective. A flexible high-density surface electromyography (HD-sEMG) sensor combined with an adaptive algorithm was used to collect and analyze the swallowing activities of patients Post-stroke dysphagia. Approach. The electrode frame, modified electrode, bonded substrate were fabricated using a printed circuit process, controlled drop coating, molding, respectively. adaptation achieved by Laplace Teager-Kaiser energy operators extract active segments, cross-correlation coefficient...

Electroencephalography (EEG) is widely used to study brain activity and diagnose diseases due its low cost non-invasiveness. EEG has an excellent temporal resolution, but it does not provide good spatial resolution. The blurring effects of the head volume conductor are considered be main reason for Concentric ring electrodes have been shown significantly better resolution than conventional which usually silver or gold as contact conductors with scalp. However, metallic interfaces high...

This paper reports a novel high-density surface electromyography (HD-sEMG) MEMS sensor with high stretchability for silent speech recognition. A 21-channel annular sector-shaped electrode array is proposed the serpentine structure to realize flexible interconnection, which can be repeatedly stretched under 40% strain without failure, perfectly adapting skin of lower jaw and ensuring movement muscles restriction. The achieve tight adhesion by modifying electrodes self-adhesive hyaluronic acid...

High-density surface electromyography (HD-sEMG) is a noninvasive technique that covers limited skin area with HD-sEMG sensors to measure muscle electrical activity. Therefore, are crucial, especially in clinical settings, and at least three areas need further improvement. First, the complex electromagnetic environment practice can overwhelm effective HD-sEMG. Second, lack of adhesion between electrode lead severe motion artifacts Third, different individuals have physiological structures,...

The application of Bacillus mucilaginosus and carriers has positive effects on tobacco growth soil microbial activity. In this paper, we investigated the characteristics changes in under carrier dosing, as well different fungicide additions carriers. results study showed that (1) addition a good improvement effect indicators such plant height, maximum leaf length, width, stem thickness field tobacco. four biochar group were 21.32%, 5.80%, 10.39%, 8.07% higher than those control group,...

Abstract The Tb 3+ transport in dispersion supported liquid membrane (DSLM) consisting of polyvinylidene fluoride (PVDF) as the support and solution including HCl stripping 2‐ethyl hexyl phosphonic acid‐mono‐2‐ethyl ester (P507) dissolved kerosene solution, has been studied. effects pH value, initial concentration different ionic strength feed phase, volume ratio carrier, agents phase on also investigated, respectively. As a result, optimum conditon was that 4.0 mol/L, P507 0.10 1.0 value...