PETROLEUM SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.3
Meili Liu,Zhengrui Hu,Shichang Peng,Jiaqing Chen,Pingping Qiao
This article aimed to display the stability and demulsification characteristics of oil displacing Pickering emulsions, which have excellent stability and exhibit fast demulsification properties under the action of non-uniform, high-frequency, high-voltage electric fields. The surface of SiO2 nanoparticles was modified by silane coupling agent to obtain hydrophobic modified SiO2 nanoparticles for preparing the Pickering emulsion. Experiments showed that the stability of Pickering emulsions improved with increasing nanoparticles concentration. Applying a non-uniform electric field at high frequency and high voltage for 4 min was shown to successfully demulsify and dehydrate Pickering emulsions. The dehydration efficiency gradually increased when the electric field voltage was increased from 3 to 7 kV, but the growth rate gradually decreased; when the electric field frequency increased from 1 to 5 kHz, the dehydration efficiency increased in a stepwise manner, but the variation was extremely limited. The best dehydration effect was achieved at 7 kV and 5 kHz, with a dehydration efficiency of 63.6%. Based on the electric field distribution characteristics and particle force analysis, it is proposed that the intrinsic cause of emulsion demulsification is the movement and redistribution of nanoparticles along the electric field intensity gradient direction at the droplet interface by dielectrophoretic force.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2024
·
IF 7.2
Huanmin Yao,Haibao Mu,Maoqun Shen,Andrea Cavallini,He Li,Haoxiang Zhao,Wendong Li,Daning Zhang,Guanjun Zhang
The application of nonlinear conductivity coatings in high-voltage power module is a promising strategy for significantly improving electrical insulation performance. The core of the improvement principle is that the nonlinear conductivity realizes a dynamic optimization of the discharge risk inside the material. The realization of this nonlinear conductivity requires sufficient microscopic arrangement of fillers that align with the macroscopic insulation structure. However, conventional methods fail at precise arrangement control so that typically require high filler concentration, which markedly increases dielectric loss and leakage current. Drawing inspiration from the bamboo structure, metamaterials offer an efficient tuning of nonlinear characteristics with lower filler concentrations through thoughtful design. In this context, we introduce a novel approach to fabricate SiC whisker / silicon elastomer metamaterial coatings leveraging the dielectrophoretic effect. Comprehensive testing of the physical and chemical properties of the composites confirmed the successful preparation of the material. And the metamaterial exhibits excellent nonlinear conductivity and low dielectric loss across various temperatures. Notably, after applying the metamaterial coating, the maximum electric field stress within the power module was reduced by nearly ten times, and the partial discharge inception voltage (PDIV) increased by 58.9 %, 74.7 %, and 32.8 % at 30 °C, 60 °C, and 90 °C, respectively. From solid physical mechanism to exquisite material design and practical device-level implementation, this study offers valuable insights into enhancing the insulation performance of power module and demonstrates substantial potential for further industrial applications.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Microsystems & Nanoengineering
·
2025
·Vol. 11
·期 1
·1-13
·
IF 9.9
Zheng Lixiang,Li Gong,Du Henan,Li Zonghao,Xu Bingrui,Yang Fan,Mao Yanan,Wei Jing,Xie Hainan,Xie Wei,Fu Rongxin,Liu Na,Zhang Shuailong,Liu Lianqing,Li Wen Jung,Sun Yu
Automated parallel manipulation of multiple micro-objects with optoelectronic tweezers (OET) has brought significant research interests recently. However, the parallel manipulation of multiple objects in complex obstacle-dense microenvironment using OET technology based on negative dielectrophoresis (nDEP) remain a big technical challenge. In this work, we proposed an adaptive light pattern design strategy to achieve automated parallel OET manipulation of multiple micro-objects and navigate them through obstacles to target positions with high precision and no collision. We first developed a multi-micro-object parallel manipulation OET system, capable of simultaneous image processing and microparticles path planning. To overcome microparticle collisions caused by overlapping light patterns, we employed a novel adaptive light pattern design that can dynamically adjust the layout of overlapping light patterns according to surrounding environment, ensuring enough space for each microparticle and preventing unintended escapes from the OET trap. The efficacy of this approach has been verified through systematic simulations and experiments. Utilizing this strategy, multiple polystyrene microparticles were autonomously navigated through obstacles and microchannels to their intended destinations, demonstrating the strategy’s effectiveness and potential for automated parallel micromanipulation of multiple microparticles in complex and confined microenvironments.
研究领域:
微纳米技术
·
生物医学工程
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Xin Gao,Mupeng Zheng,Huijun Lv,Yongzheng Zhang,Mankang Zhu,Yudong Hou
Textured piezoelectric composites (PCs) based on dielectrophoresis (DEP) reveal great merits in both improving sensitivity and maintaining flexibility, thus trending to be promising candidates for high sensitive flexible sensors. However, the DEP technique shows poor applicability in fabricating textured PCs with high filling content, which severely limits further improvement of piezoelectric performance. Herein, we propose a new strategy to enhance DEP force by decorating Cu nanoparticles on Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 (BCZT) particles, thus textured BCZT@Cu/PDMS PCs with high filling content are obtained. The results proved that the enhanced DEP force is contributed by the excellent conductivity and capability of distorted electric fields of decorated Cu nanoparticles . Consequently, an ultrahigh piezoelectric voltage constant ( g 33 ) of 720 × 10 −3 Vm/N was achieved, which is much larger than that in other counterparts. Furthermore, the as-prepared piezoelectric sensor exhibits excellent sensitivity and flexibility, which can fit vulnerable joints like a band-aid seamlessly. On this basis, a flexible sport health monitoring system was developed, which shows great capabilities in real-time warn of the risky actions, rectification of wrong postures, and sports injury prevention.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Wenguang Yang,Wenhao Wang,Xiangyu Teng,Zezheng Qiao,Zhixing Ge,Zheng Yuan
Microcapsules have a wide range of applications in the medical field, but their fabrication process is often complicated and inefficient. This study presents a method that uses polystyrene (PS) microspheres and polyethylene glycol diacrylate (PEGDA) to achieve both particle positioning and polymerization in a single step through optically induced dielectrophoresis (ODEP), enabling the fabrication of microcapsules with different shapes. The maximum speed and dielectrophoretic force of 1 and 10 μm PS microspheres are investigated in solutions with different PEGDA concentrations and frequencies. After the PS microspheres are collected, the polymerization reaction of PEGDA is completed in the original solution. In addition, by extending the irradiation time of the light source, the self-folding of the two-dimensional capsule is induced, thereby producing a capsule with particles for a tubular three-dimensional shape. This innovation holds promise for various applications in the targeted treatment of diseases and medical diagnosis.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Xiaoguang Lin,Jie Yao,Hua Dong,Xiaodong Cao
In recent years, microfluidic dielectrophoresis (DEP) devices, as one of the most promising tools for cell and particle sorting and separation, are facing the bottleneck in the development of practical products due to the high-cost yet low-yield device manufacturing via traditional microelectromechanical systems (MEMS) and the challenge of maintaining the cell viability during DEP treatment. In this paper, we demonstrate a facile, low-cost, and high-throughput method of constructing continuous-flow microfluidic DEP devices via screen-printing technology. The new device configuration and operation strategy not only facilitate cell and particle sorting and separation using 3D electrodes as sidewalls of microchannel but also improve cell viability by reducing the exposure time of cells to high electrical-field gradients. Furthermore, we propose and validate a semiempirical formula with which to simplify the complicated calculation and plotting of DEP spectra. As a consequence, the optimal DEP parameters and crossover frequencies can be obtained directly using our devices instead of typical electrorotation method. To evaluate the performance of a screen-printed continuous flow microfluidic DEP device, a suspension containing polystyrene (PS) microspheres and erythrocytes is used as the biosample. Our results show that a high sorting efficiency (ca. 93%) with a high cell viability (hemolysis ratio of <4.8%) can be achieved, indicating the excellent performance and promising application of such devices for cell and particle sorting and separation.
研究领域:
生物医学工程
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微流控技术
·
细胞生物学
·
生物传感器
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转化医学
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纳米医学
·
临床检验
✓ 已验证
DOI
高影响因子
PHYSICA SCRIPTA
·
2024
·Vol. 99
·期 10
·105121
·
IF 2.6
Wenguang Yang,Wenhao Wang,Xiangyu Teng,Zezheng Qiao,Haibo Yu,Shuxiang Cai
The manipulation of micron-scale semicircular tubular structures has wide applications in micro-nano processing, device manufacturing, biomedicine, and micron sensing and measurement. Here, we propose a method to fabricate and manipulate semicircular tubular structures based on optically induced dielectrophoresis (ODEP). First, electric field intensity simulations are performed for polyethylene glycol diacrylate (PEGDA) semicircular tubular structures with different conductivities and of different heights. In addition, the polarization model based on slender rods reveals that the semicircular tubular structure is subject to a negative dielectrophoretic force and tends to move along the vertical direction of the central axis. Finally, according to the maximum movement speed of the semicircular tubular structure, the resistance and dielectrophoretic force it receives are characterized. This allows for the realization of the translation and rotation operations of semicircular tubular structures of different lengths, and the assembly of multiple structures into different shapes. This assembly method holds significant promise for applications in biomedicine and the manufacturing and processing of micro-nano devices.
研究领域:
微机电系统(MEMS)
·
纳米技术
·
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Junmin Liu,Xiaocong Chang,Rencheng Zhuang,Ao Liang,Shaobo Ding,Jiaxu Dong,Zuankai Wang,Dekai Zhou,Longqiu Li
Electric field-driven micro/nanorobots (MNRs), combined with dielectrophoretic forces, provide a label-free approach for active cargo transport. However, their ability to transport cargo becomes severely limited when the cargo volume exceeds their own by several orders of magnitude. In this work, we propose a transport strategy that overcomes this limitation. Specifically, we introduce a “dynamic Janus structure reconstruction” transport strategy powered by asymmetric tubular electrically driven microrobots (ATEDMs). Under high-frequency electric fields, ATEDMs are attracted to the cargo, forming Janus-like structures and generating asymmetric electric field gradients around the contact surfaces, thus generating the dielectrophoretic forces required for cargo transport. The motion of the transported cargo is strongly influenced by the number and distribution of the ATEDMs, and the optimal range of ATEDM numbers for different motion patterns can be determined through probabilistic statistical methods. By integrating static magnetic fields, ATEDMs enable directed and controlled cargo transport. Additionally, we demonstrate the use of ATEDMs for palletizing cargo and transporting large biological tissues. This “dynamic Janus structure reconstruction” transport strategy allows for the transportation of cargoes more than 100,000 times larger than the volume of a single microrobot, providing an effective and versatile approach for transporting large-volume cargoes, thus expanding the application potential of MNRs in complex environments.
研究领域:
生物医学工程
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纳米技术
·
微机器人学
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生物运输
·
电动力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2025
·
IF 9.8
Huan Liu,Yan Wang
Membrane separation technology has emerged as a cornerstone for water purification due to its high separation efficiency, energy efficiency, and minimal environmental footprint. However, membrane fouling remains a critical challenge to its sustainable application, increasing energy consumption and operational costs. This study introduces a self-triggered polytetrafluoroethylenezeolite/imidazole framework-8 (PTFE@ZIF-8) composite membrane, capable of autonomous antifouling and enhanced separation by harnessing inherent flow energy to generate piezoelectric voltage oscillations and demonstrate piezo-catalytic activity. The enhanced piezoelectricity of the PTFE@ZIF-8 membrane resulted in superior antifouling capacity and significantly enhanced rejection performance compared to the pristine PTFE membrane. Detailed characterization and simulation studies revealed that the self-triggered piezoelectric voltage oscillations induced dielectrophoresis, which played a pivotal role in fouling control and separation enhancement. Additionally, the in situ generation of reactive oxygen species (ROS) during filtration further contributed to the antifouling performance. Increasing feed flow rates further boosted ROS production and piezoelectric outputs, improving separation efficiency without external energy input. This study advances energy-efficient water purification by leveraging flow energy to power antifouling and separation processes, aligning with sustainable resource management goals.
研究领域:
水净化技术
·
膜科学
·
压电材料
·
环境工程
·
可持续资源管理
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Junjun Wu,Xinyu Li,Tao Lin,Lei Zhuang,Biao Tang,Feilong Liu,Guofu Zhou
Droplet directional transport is one of the central topics in microfluidics and lab-on-a-chip applications. Selective transport of diverse droplets, particularly in another liquid phase environment with controlled directions, is still challenging. In this work, we propose an electric-field gradient-driven droplet directional transport platform facilitated by a robust lubricant surface. On the platform, we clearly demonstrated a liquid-inherent critical frequency-dominated selective transport of diverse droplets and a driving mechanism transition from electrowetting to liquid dielectrophoresis. Enlightened by the Kelvin–Helmholtz theory, we first realize the directional droplet transport in another liquid phase whenever a permittivity difference exists. Co-transport of multiple droplets and various combinations of droplet types, as well as multifunctional droplet transport modes, are realized based on the presented powerful electric-field gradient-driven platform, overcoming the limitations of the surrounding environment, liquid conductivity, and intrinsic solid–liquid wetting property existing in traditional droplet transport strategies. This work may inspire new applications in liquid separation, multiphase microfluidic manipulation, chemical reagent selection, and so on.
研究领域:
微流控
·
芯片实验室技术
·
电水动力学
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROPHORESIS
·
2025
·Vol. 46
·期 24
·1708-1716
·
IF 2.5
Kai Zhao,Ang Li,Bing Yang,Yiyang Huo,Mengrao Tang,Yi Zhang,Junsheng Wang
A novel DC-dielectrophoresis (DEP) method employing a tunable insulating microdroplet for the continuous sorting of microtargets is presented in this article. To induce the dielectrophoretic effect, a DC electric voltage is applied via the microdroplet through the microchannel to induce the gradient of the inhomogeneous electric field. When passing through the gap between the microdroplet and the channel where there is the strongest nonuniformity of the electric field, the microparticles experience the DEP effects, and their trajectories shift. The effects of the gap spacing and the applied voltage on the distribution of the electric field gradient and the effect of the flow rate on the particle trajectory were analyzed numerically. On the basis of theoretical analysis, a tunable microdroplet-based microfluidic chip was fabricated, and the experimental system platform centered on the tunable droplet chip was constructed. Experiments were conducted to demonstrate the sorting of 5 and 10 µm polystyrene microparticles by adjusting the joint gap distance, flow rate, and applied voltage. The experimental results were in good agreement with the numerical simulation, which proved the feasibility of using microdroplet to serve as tunable insulator for the manipulation and separation of microtargets.
研究领域:
微流控
·
电动学
·
芯片实验室
·
颗粒分离
·
介电泳
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）