Flexible pressure sensors with high-performance show broad application prospects in health monitoring, wearable electronic devices, intelligent robot sensing, and other fields. Although flexible have made significant progress sensitivity detection range, most of them still exhibit strong nonlinearity, which leads to troubles signal acquisition thus limits their popularity practical applications. It remains a serious challenge for the sensor achieve high linearity while maintaining...

Different surfactants are introduced to study the diameter and morphology transformation characteristics of electrospun nanofiber. Surfactants increase net charge density instability motion charged jet. The provides a good way stretch jets into finer ones, by which beaded structures also prevented. Ultrafine nanofiber with average less than 65 nm can be fabricated. decreases surfactant concentration in polymer solution. nanofibers anionic sodium dodecyl sulfate (SDS) have smallest diameter....

Flexible pressure sensors with high stretchability, sensitivity, and stability are undoubtedly urgently required for potential applications in intelligent soft robots, human-machine interaction, health monitoring, other fields. However, most current flexible unable to endure large deformation prone performance degradation or even failure during frequent operation due their multilayered structures. Here, we propose a stretchable all-nanofiber iontronic sensor that is composed of ionic...

ABSTRACT In this article, sheath gas is introduced to design a novel multinozzle spinneret improve the productivity of uniform nanofibers. The in laminar flow provides an additional stretching force overcome mutual interferences among nozzles, thus simultaneous ejection multiple jets promoted. addition, also contributes decrease diameter and distribution range With constraint gas, nanofibers 0.618‐0.712 g·h −1 , which about 30‐50 times as high that from traditional electrospinning. dynamic...

A multi-layer interconnection structure is a basic component of electronic devices, and printing the key process in printed electronics. In this work, electrohydrodynamic direct-writing (EDW) utilized to print conductor—insulator—conductor structure. Silver ink chosen conductor pattern, polyvinylpyrrolidone (PVP) solution fabricate insulator layer between bottom top patterns. The influences EDW parameters on line width patterns are studied systematically. obtained results show that increases...

Abstract Objective Risk stratification for patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD) may help clinicians choose appropriate treatments and improve the quality care. Methods A total 695 hospitalized AECOPD from January 2015 to December 2017 were considered. They assigned a death survival cohort. The independent prognostic factors determined by multivariate logistic regression analysis. Meanwhile, we also compared new scale three other scores tested...

Electrospinning has been widely used in fabricating nanofibers and nanofibrous membranes. Recently, the fabrication of three-dimensional (3D) macrostructures become a hot subject development electrospinning technology. In this paper, 3D macrostructure was constructed by using apparatus with both dynamic static collecting templates. The effect governing parameters on formation process is studied, such as applied voltage, flow rate, needle-tip-to-collector distance, rotating speed. It found...

The detailed understandings of temperature profiles and flow-flame interaction in unsteady premixed swirling flames are crucial for the development low emission turbine engines. Here, a phase-locked tomographic reconstruction technique measuring large absorption cross section CO2 at its mid-infrared fundamental band around 4.2 μm is used to acquire flame situ volume fraction distribution turbulent under different levels external acoustic forcing amplitude. temporally resolved field variation...

An ionic polymer metal composite (IPMC) is a kind of electro-active polymer. Due to the properties low driving voltage, large deformation, flexibility and lightness, it becoming one more popular from diversity smart materials. In this study, novel structure Nafion® film proposed improve performance an IPMC. IPMC samples with gradient in thickness are fabricated their investigated confirm validity structure. The deformation displacement blocking force compared under AC DC voltage by...

This study is concerned with the experimental and theoretical investigation of combustion instabilities in a premixed swirl combustor. It focused on effects mixing distance intrinsic thermoacoustic mode. The swirler as an origin swirling flow also source disturbance, which has flame response. location varied experiment to effect transfer functions. A low order model built analyze system. results show that ITA switches from unstable state stable changes increment 15 mm; while instability...

Abstract Efficient ion transport and enriched responsive modals via modulating electrochemical properties of conductivity capacitance are essential for soft electro‐ionic actuators. However, cost‐effective straightforward approaches to achieve expedited fabrication active electrode materials capable multimodal‐responsiveness remain limited. Herein, this work reports the one‐step ultrafast laser direct patterning method, readily synthesize electro‐ magneto‐active material, derived from unique...

Laminar sheath gas is introduced to increase the stability of Electrohydrodynamic Direct-Writing (EDW). The external stretching force from promotes ejection threshold, diameter jet and printed fibers as well. critical voltage decreases with pressure. fiber well that charged jet. As pressure increases 0 25 kPa, average micro/nano structure reduces 4.46μm 845.25 nm. laminar field flow shelters free surrounding interferences, helps move in a straight line. With help gas, can be improved...

Oxide gas sensor based on electrospun nanofibers were fabricated and studied in this paper. Polyvinyl pyrrolidone (PVP)/Nickel acetate precursor electrospun, which sintered into Nickel oxide (NiO) with diameter the range of 100 to 400 nm. The morphology structure NiO nanofiber characterized by scanning electron microscopy X-ray diffraction. Gas sensing properties (C <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> H...

A simple and versatile two-step silicon wet etching technique for the control of width height glass frit bonding layer has been developed to improve strength reliability in wafer-level microelectromechanical systems (MEMS) packaging processes. The is set by design a vertical reference wall which regulates distance between wafer encapsulation capping substrate. On other hand, constrained two micro grooves are used accommodate spillages extra during process. An optimized thermal process,...

By introducing image recognition and micro-current testing, jet behavior research was conducted, in which the real-time of ejection mode realized. To study factors influencing modes current variation trends under different modes, an Electrohydrodynamic Direct-Write (EDW) system with functions detection firstly built. Then a program developed to recognize modes. As voltage applied metal tip increased, four EDW occurred: droplet mode, Taylor cone retractive forked mode. In this work,...

The online recognition of jet mode is important for the accurate control and further application electrohydrodynamic direct-writing (EDW) technology. An EDW system with a current detection module built recognition. measured to recognize when printing patterned structures. Then, data processing program digital Kaiser low-pass filter developed in MATLAB, via which noise signal reduced. features current, including fluctuation peak intervals, are studied different modes. characteristics three...