Polymers
·
2019
·Vol. 11
·期 3
·526
·
IF 3.164
Jiayun Chen,Xiaoying Xiong,Qilong Zhang,Lingling Shui,Shitao Shen,Hui Yang,Zhicai Zhu,Fang Zhang
P(VDF-TrFE) (vinylidene fluoride-co-trifluoroethylene)/PMMA (PVT/PMMA) blended films synthesized through a facile solution-blending method show outstanding performance for practical electrowetting and energy storage applications. The van der Waals forces and dipolar interactions in neighboring P(VDF-TrFE) and PMMA chains, together with the suppressed free volume (or defect) are critical to the significantly-enhanced electrical properties. Typical, Teflon-covered P(VDF-TrFE)/PMMA blended film exhibits a high dielectric constant of 13 with low dielectric loss (~0.05) at 100 Hz and a large initial contact angle of 122°. Its electrowetting response with a contact angle modulation of 50° in air and low contact angle hysteresis demonstrate that it is promising for low-voltage electrowetting applications. Furthermore, with an energy density of 11.8 J/cm3, approximately double that of pure P(VDF-TrFE), PVT/PMMA blended films containing 20 wt % PMMA turn out to be superior materials for energy storage applications, due to their significantly-enhanced polarization and reduced remnant polarization.Keywords:electrowetting;energy storage;dielectric constant;hydrophobicity
研究领域:
材料科学
·
电气工程
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 49
·1800775
·
IF 13.325
Yufeng Yan,Zhenyan Guo,Xiaofang Zhang,Linlin He,Yan Li,Kesong Liu,Jinhua Cai,Dongliang Tian,Lei Jiang
Directional motion of fluid droplets is attracting considerable research attention. Despite much progress in this field, electrowetting-based stiction switch that drives unidirectional transport of an underwater oil droplet or air bubble on a wire surface is still a challenge to realize. Here, a strategy to collect and unidirectionally transport an underwater oil droplet or air bubble on a porous polystyrene (PS) film-coated copper wire surface through the combination of electrowetting-induced stiction switch and buoyancy is demonstrated. The porous PS film-coated copper wire fabricated by the breath figure method at a relative humidity of 75% can catch and hold an underwater oil droplet or air bubble without applied voltage. With increasing applied voltage, the stiction of the underwater oil droplet or air bubble on the porous PS film surface weakens because water increasingly wets the film surface. The underwater oil droplet or air bubble can move unidirectionally on the porous PS film-coated wire surface upward or downward at a voltage larger than its critical voltage according to whether its density is lower or higher than that of water. This work should aid the development of devices displaying electrowetting-based changes for use in fluid collection, manipulation, unidirectional transfer, release, and removal.
研究领域:
材料科学
·
流体物理
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Wenjie Zhu,Hong Qian,Shengya Cao,Wei Xia,Xilong Wang,Jing Jin,Xin Wang,Hao Zhang,Dongsheng Liu,Ying Chen
Background The early detection of Hepatocellular Carcinoma (HCC) is crucial for improving patient survival rates.Early diagnosis of HCC can significantly enhance treatment outcomes and reduce disease progression. Antigen detection of tumor markers is one of the important diagnostic methods for HCC. However, Traditional antigen detection methods often rely on heavy detection equipment, involve lengthy turnaround times, and must be conducted in laboratory settings. Therefore, there is a clear need for a portable, low-skill, rapid sample-to-result detection method for early HCC biomarkers. Results We propose a new platform based on electrowetting-on-dielectric digital microfluidic(EWOD-DMF) for the detection of early-stage HCC biomarkers, enabling the quantitative measurement of Alpha-Fetoprotein (AFP), the proportion of AFP-L3 in total AFP (AFP-L3%), and Des-Gamma-Carboxy Prothrombin (DCP). First, serum samples are processed through the microfluidic system, achieving the separation of AFP-L3 within 10 min. Next, immunoassays are performed within 15 min, using magnetic particles to capture biomarkers such as AFP, AFP-L3, and DCP, followed by enzymatic reactions that generate detectable signals. Each chip can simultaneously detect three biomarkers from five different samples, allowing for a total of fifteen targets to be tested, with only approximately 2.4 μL of serum required for each biomarker detection. Ultimately, data are analyzed with dedicated software to quantitatively measure the HCC biomarkers. The detection limits for AFP or AFP-L3 and for DCP are 0.24 ng/mL and 1.89 ng/mL, respectively. Significance This study presents a EWOD-DMF platform for early-stage HCC diagnosis, capable of simultaneously detecting multiple samples and biomarkers, thus improving detection efficiency and diagnostic accuracy. Moreover, the platform has POCT capability, with advantages in portability and cost-effectiveness, providing clinicians and primary healthcare institutions with a fast and convenient solution for early-stage HCC diagnosis.
研究领域:
医学工程
·
肿瘤学
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DOI
PubMed
高影响因子
Small
·
2024
·Vol. 20
·期 48
·2405161
·
IF 13
Haoqiang Feng,Shitao Shen,Mingliang Jin,Mengjie Xiao,Mengjun Liu,Qilin Zhang,Hongwei Jiang,Zichuan Yi,WenShuai Wu,Guofu Zhou,Lingling Shui
The assembly of colloidal particles into micro-patterns is essential in optics, informatics, and microelectronics. However, it is still a challenge to achieve quick, reversible, and precise assembly patterns within micro-scale spaces like droplets. Hereby, a method is presented that utilizes in-plane dielectrophoresis to precisely manipulate particle assemblies within microscale droplets. The electro–microfluidic particle assembly platform, equipped with ingenious electrode designs, enables the formation of diverse micro-patterns within a droplet array. The tunability, similarity, stability, and reversibility of this platform are demonstrated. The ability to assemble letters, numbers, and Morse code patterns within the droplet array underscores its potential for information encoding. Furthermore, using an example with four addressing electrodes beneath a droplet, 16 distinct pieces of information through electrical stimuli is successfully encoded. This unique capability facilitates the construction of a dynamic electronic token, indicating promising applications in anti-counterfeiting technologies.
研究领域:
微流控技术
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材料科学
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电子信息学
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DOI
PubMed
高影响因子
Materials Horizons
·
2023
·Vol. 10
·期 8
·3140-3152
·
IF 13.3
Chao Yan,Xiangming Li,Zhengjie Yang,Xiaopei Wang,Hao Ran,Ruolin Zhang,Hongmiao Tian,Chunhui Wang,Xiaoliang Chen,Jinyou Shao
The voltage outputs of flexible piezoelectric films after bending deformation have always been limited by two factors, including the incompatible polarization direction with bending strain and the interfacial fatigue failure between the piezoelectric films and the electrode layers, largely hindering the applications in wearable electronics. Herein, we demonstrate a new piezoelectric film design, where 3D-architectured microelectrodes are fabricated inside a piezoelectric film by electrowetting-assisted printing of conductive nano-ink into the pre-formed meshed microchannels in the piezoelectric film. The 3D architectures increase the piezoelectric output of a typical P(VDF-TrFE) film by more than 7 fold compared with the conventional planar design at the same bending radius, and, more importantly, decrease the output attenuation down to only 5.3% after 10 000 bending cycles, less than one third of that for the conventional design. The dependence of piezoelectric outputs on feature sizes of 3D microelectrodes was investigated numerically and experimentally, providing a route for optimizing the 3D architecture design. Different composite piezoelectric films with internal 3D-architectured microelectrodes were fabricated, exhibiting improved piezoelectric outputs under bending deformations, demonstrating that our printing methods could have broad applications in various fields. The fabricated piezoelectric films, worn on human fingers, are used for remotely controlling the robot hand gestures by human–machine interaction; furthermore, the fabricated piezoelectric patches are used to successfully sense the pressure distribution by integrating with spacer arrays to convert the pressing movement into bending deformation, demonstrating the enormous potential of our piezoelectric films in practical applications.
研究领域:
材料科学
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电子工程
·
柔性电子技术
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DOI
PubMed
高影响因子
DISPLAYS
·
2014
·
IF 1.205
Xia Chen,Tao He,Hongwei Jiang,Biming Wei,Guofei Chen,Xingzhong Fang,Mingliang Jin,Robert A. Hayes,Guofu Zhou,Lingling Shui
We report a screen-printing fabrication process for large area electrowetting display (EWD) devices using polyimide-based materials. The poly(imide siloxane) was selected as hydrophobic insulator layer, and relatively hydrophilic polyimide as grids material. EWD devices that use poly(imide siloxane) as hydrophobic insulator fabricated with conventional methods showed good and reversible electrowetting performance on both single droplet level and device level, which showed its potential application in EWDs. The compatibility of polyimide-based materials (hydrophobic poly(imide siloxane) and hydrophilic polyimide) guarantee the good adhesion between two layers and the capability of printable fabrication. To this end, the hydrophilic grids have been successfully built on hydrophobic layer by screen-printing directly. The resulting EWD devices showed good switch performance and relatively high yield. Compared to conventional method, the polyimide-based materials and method offer the advantages of simple, cheap and fast fabrication, and are especially suitable for large area display fabrication.
研究领域:
材料科学
·
显示技术
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DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2015
·Vol. 212
·期 9
·2023-2030
·
IF 1.616
Xia Chen,Hongwei Jiang,Robert A. Hayes,Xiange Li,Tao He,Guofu Zhou
The screen printing of amorphous fluoropolymer films as insulators for electrofluidic display device use is demonstrated. Screen printing enables the hydrophobic dielectric to be directly patterned at device level with the required film thickness as well as excellent material utilisation. The films give very good electrical performance, with high uniformity and dielectric strength, and the resulting devices exhibit comparable electro-optic behaviour to those fabricated with spin-coated films.
研究领域:
材料科学
·
显示技术
·
电子工程
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Anlin Xu,Ziyan Yang,Zhiyi Zhou,Pu Yang,Yang Yu,Jiayang Liu,Yunhai Zhang
Hydrogen peroxide (H 2 O 2 ) synthesis by electrochemical two-electron oxygen reduction has garnered increasing interest as a wide range of potential applications. Gas diffusion electrodes (GDEs) can effectively promote the H 2 O 2 production efficiency by overcoming the oxygen mass transfer limitations but strongly influenced by the electrowetting process along the long-term operation. In this study, the effect of trans -electrode pressure (TEP) of GDE cathode on the electrowetting process was further elucidated. We controlled the TEP values of four types of GDEs: two Ni-based GDEs and two carbon cloth GDEs prepared by hot-pressing or brushing carbon black. SBA-15 was further used to regulate the microstructure of one Ni-based GDE. It was found that an optimal range of TEP occurred for all tested GDEs in terms of the max. concentration, the yield efficiency, the energy consumption, and the stability because TEP may change the triple-phase interface and influence the anti-electrowetting effect. The porosity of hot-pressed Ni GDE can maintain the TEP window and thus enhance the production of H 2 O 2 , likely via creating oxygen-containing functional groups and a bimodal pore structure on the electrode, revealed with several characterization techniques including SEM, CA, XPS , Raman spectra, CV and EIS . The porous Ni GDE presented an efficient and stable production of H 2 O 2 for 10 cycles: yielding H 2 O 2 at 4393.2–4602.2 mmol m −2 h −1 with current efficiencies of 94.2–98.7%. The best accumulated H 2 O 2 concentration can reach up to 3.58 ωt% H 2 O 2 at 10 h. The results provide an important reference for the industrial scaleup of electro-production of H 2 O 2 with GDEs.
研究领域:
电化学
·
材料科学
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DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 8
·4032-4038
·
IF 2.936
Yuting Xia,Jiayun Chen,Zhicai Zhu,Qilong Zhang,Hui Yang,Qianqian Wang
In this article, we provide a feasible method to prepare high-dielectric-constant hydrophobic composite films, which show potential application as the insulator layer in electrowetting devices. SiO2@MgO core–shell nanoparticles were fabricated via a hydrolysis process and embedded into the PMMA matrix. The microstructure of the nanoparticles and the cross-section of the films indicated that a SiO2 coating has successfully been prepared around the MgO particles with a thickness of about 20–30 nm and the nanofillers were homogeneously dispersed in the polymer. Hydrophobic films (contact angle ∼115°) with appropriate glass transition temperature were obtained. The dielectric constant at various frequencies of the functional fillers enhanced with increasing the SiO2@MgO filler content. The results suggested that SiO2@MgO is more effective in increasing the dielectric constant of PMMA when compared with MgO sheets. Typically, the dielectric constant of the PMMA composite filled with 40 wt% SiO2@MgO reaches 19.1 at 40 Hz, in contrast to 9.7 for the composite filled with 40 wt% MgO sheets and 3.8 for pristine PMMA. Also, the composites exhibited low electrical conductivity (≤10−7) even at high frequency. All the improved performances showed potential application in the dielectric layer of electrowetting devices.
研究领域:
材料科学
·
电气工程
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产品关联
DOI
高影响因子
LAB ON A CHIP
·
2025
·
IF 5.4
Juyue Dong,Zerui Song,kunlun guo,Hang Xu,Zhibei Qu,Zhen Gu,Hui-Feng Wang
Digital microfluidic enables parallel, quantitative and flexible handling of discrete droplets via electrowetting on dielectric (EWOD) force. However, droplet splitting behavior in conventional digital microfluidics is limited by the geometry of actuating electrodes. In this study, we proposed a gravity-induced size-tuning splitting method (GITS), which has no requirements for specialized electrodes or complicated chip configurations. Both experimental and simulation results demonstrated that gravity facilitates the droplet generation by directionally enhancing the EWOD force in a vertical digital microfluidic chip. Further observation revealed that the size tunability was affected by droplet volume, voltage amplitude, and especially contact line ratios between droplet and electrodes. Moreover, to achieve reliable on-chip operations, the critical size of droplet for passive dropping was investigated, which exhibited a functional relationship with the gap height. Then GITS was implemented by integrating an artificial intelligence (AI)-driven feedback control of the contact line and the gravity induced droplet dropping. As a result, it achieved wide splitting ratios from 1 to 7.33, with the coefficient of variation below 3%. Finally, GITS was applied to manage reagents of various sizes for on-chip cell viability assays, demonstrating its potential for flexible reagent configuration in future biomedical applications.
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DOI
PubMed
高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Zhiwei Zhang,Yi Li,Lulu Liu,Peilin Mao,Lei Zhang,Jie Liang,Jianhua Zhang
Digital microfluidics (DMF) technology provides high-precision and flexible liquid manipulation capabilities for lab-on-a-chip (LOC) systems, enabling complex biochemical reactions and detection analyses within a compact space. Electrowetting-on-dielectric (EWOD), one of the most widely used actuation mechanisms in DMF devices, is favored for its simplicity, controllability, rapid response, and cost-effectiveness. However, due to challenges in fabricating sensors on hydrophobic surfaces, reports on EWOD chips integrated with biosensors remain limited. In this work, we successfully integrated electrochemical sensors into EWOD chips via plasma treatment for surface modification. The plasma-treated EWOD device maintained excellent droplet actuation performance (movement time <8 s) and achieved glucose detection in the 0-0.6 mM range using the embedded sensor. The limit of detection was determined to be 0.056 mM (S/N = 3). This EWOD chip with integrated printed electrochemical sensors represents a promising tool for diverse biochemical analyses.
研究领域:
微流控技术
·
生物分析化学
·
传感器
·
芯片实验室技术
·
电化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Junhao Chen,Yafei Lou,Linan Sun,Azadeh Nilghaz,Shan Liu,Junfei Tian
The first step in wearable sweat sensing is to controllably acquire clean sweat within a limited space. Although some drug-induced methods such as iontophoresis can obtain clean sweat, there are still unsolved problems such as uncontrollable drug release, high operational current density, and low integration of modules due to the separation areas of sweat secretion and sweat delivery. In this study, we propose a novel method for the controlled release of sweat-inducing drugs for wearable sweat sensors. A kind of electro-responsive screen-printed electrode has been designed, which consists of a hybrid layer composed of 3,4-Ethylenedioxythiophene, pilocarpine nitrate, and nadroparin calcium and an electrowetting layer of polymerized 3-methylthiophene. This efficient electrode can achieve a controllable release density of up to 9.395 μg·cm –2 for sweat-inducing pilocarpine within 10 minutes and operates at microampere levels. Furthermore, we utilized the voltage drift of Ag/AgCl electrode at varying chloride ion concentrations to achieve an estimation of chloride level in sweat for possible cystic fibrosis screening. The electrically controlled drug release, electrowetting, and electrochemical detection were integrated into a single three-electrode system first. This study is expected to promote the development of miniaturized, integrated, and non-invasive wearable biosensors for sweat monitoring.
研究领域:
生物医学工程
·
可穿戴技术
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电化学
·
汗液传感
·
无创诊断
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）