Surfaces and Interfaces
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2025
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IF 6.3
Qianxi Zhang,Jianlong Wu,Jin Yan,Shishi Li,Chengpeng Li,Zehui Han,Denghui Li,Yaokang Zhang,Xin Wang,Qingqing Zhang,Peng Zhang
Efficient droplet manipulation is of great significance in both frontier sciences and industrial applications. Although electric-field-driven droplet control enables non-destructive fluid manipulation, greatly expanding the scope and control of microfluidics, droplets are typically electrically neutral, which leads to a great limitation on the direct response to electric fields. In this study, we proposed a novel strategy that integrates self-charged droplets and external electric fields, significantly reducing the driving voltage required for droplet manipulation. A novel separation strategy for the micro-droplets is introduced to enhance electro-driven applications, ensuring the stable and precise droplet motion under various electric fields. We demonstrated that electrospinning technology, when used to fabricate polytetrafluoroethylene (PTFE) films with nanofiber and agglomerate structures on the conductive glass substrates, realizes the flexible and stable droplet control. The particular film not only reduces the droplet’s viscosity but also efficiently charges droplets. As a consequence, the droplets with volumes ranging from 68.5 µL to 87.0 µL can be manipulated stably for effective locomotion of over 5 mm under the 60 V/mm electric field. Moreover, the motion range can be adjusted by external electric field. This integrated strategy provides a reliable and versatile solution for droplet manipulation, with promising applications in the controllable chemical reactions and liquid micro-reactors.
研究领域:
物理学
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材料科学
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微流体技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
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2021
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IF 5.551
Jie Gao,Yujun Deng,Linfa Peng,Peiyun Yi,Zhongqin Lin
The preparation of hierarchical microstructured surfaces to obtain different wettability has been studied in both academy and industry. Polytetrafluoroethylene (PTFE) is an ideal material for preparing superhydrophobic surface due to its ultra-low surface energy. However, it is still a challenge to prepare hierarchical structure on the surface of PTFE. In this paper, PTFE films with hierarchical structure were successfully prepared by micro powder hot embossing (mPHE) process. Through characterization, the maximum contact angle and minimum sliding angle can reach up to 164° and 5.3° respectively. The influence of processing parameters and particle size on forming qualities was discussed. A dimensionless indicator was proposed to successfully describe the hierarchical character and characterize the relationship between wetting states and forming quality. Finally, a series of mechanical and chemical durability tests were carried out, verifying the practical application value of the prepared PTFE films.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
Heliyon
·
2024
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IF 3.4
Huimin Zhang,Nan Zhang,Zhourui Liu,Ke Jiang,Xiaofeng Zhou
The utilization of water energy through the Single Electrode Droplet-Based Electricity Generator (SE-DEG) represents a universal and high-efficiency method for water energy harvesting. Previous research has extensively elucidated the working principle of SE-DEG based on bulk effect. However, scant attention has been paid to the investigation of the electrical characteristics surrounding the SE-DEG. Remarkably, the electrical characteristics around the SE-DEG can be exploited to generate electricity and harvest corresponding energy. Here we evaluate the electrical characteristics around the SE-DEG by arranging extra electrodes. An interesting phenomenon is found that, on the premise of no contact between extra electrodes and the droplet, there is opposite electricity output from extra electrodes synchronously when the droplet contacts on the PTFE film and SE-DEG electrode and outputs the electricity. This phenomenon is comprehensively explained and verified from working mechanism, the impacts of different arrangements and the array design of extra electrodes. Significantly, utilizing the electrical characteristics could harvest additional kinetic energy with extra electrodes in SE-DEG. This investigation is expected to provide new insights into the future harnessing of water kinetic energy within the SE-DEG framework.
研究领域:
能源科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Zhenji Zhou,Caiyin You,Jizhe Jia,Weimin Xia,Zhong Li,Heguang Liu,Na Tian
Polyvinylidene difluoride (PVDF) and its copolymers are commonly used in triboelectric nanogenerators (TENGs) due to their flexibility and good mechanical–electrical properties. In this study, poly[(vinylidene fluoride)-co-trifluoroethylene] [P(VDF-TrFE)] composites were fabricated by embedding polydopamine (PDA)-coated cobalt ferrite nanorods (RCFO). A stripe-like microstructure was formed by applying a magnetic field during the curing process. The TENG was built with a polytetrafluoroethylene (PTFE) film as the negative friction material. Due to the enhanced micro–nano structure of the P(VDF-TrFE) films, the increased charge transfer occurred between the RCFO@PDA/P(VDF-TrFE) composite film and the PTFE film. Good triboelectric performance was realized, with an open-circuit voltage of 33.20 V, a short-circuit current of 1.20 μA, and a transferred charge of 13.17 nC at a frequency of 5 Hz and a vertical contact force of 15 N. Additionally, a peak power density of 32.5 μW cm −2 was achieved when connected to an external load resistor of 20 MΩ. In practical applications, the TENG could directly illuminate a series of 36 connected light-emitting diodes without the need for capacitors. The device's ability to capture stray magnetic fields was also demonstrated. A wireless transmission-based remote security system was demonstrated as the self-powered sensor in a noncontact mode.
研究领域:
纳米技术
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能量收集
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传感器
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无线通信
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安全系统
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材料科学
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聚合物复合材料
✓ 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）