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Mechanism of water-evaporation-induced electricity beyond streaming potential

Nano Research Energy 2024年第2期3卷 12-19页

作者： Sunmiao Fang Huan Lu Weicun Chu Wanlin Guo State Key Laboratory of Mechanics and Control of Mechanical Structures Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of EducationNanjing University of Aeronautics and AstronauticsNanjing 210016China College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Institute for Frontier Science Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Since its first discovery in 2017,evaporation-induced electricity has attracted extensive attention and shown significant advantages in green energy *** the streaming potential-related electrokinetic effect has been intensively explored and widely recognized as the underlying mechanism,the role of coupling between water molecules and charge carriers in the material remains *** we show through carefully designed experiments that the streaming potential effect indeed plays a role but can only contribute about half to the total water-evaporation-induced voltage occurring within the partially-wetted region of the carbon black film where the solid-liquid-gas three-phase interface *** is also shown that water evaporation from carboxyl and amino-functionalized carbon black films produces opposite voltage *** first-principles calculations unveil that the adsorption of water molecules can lead to reversed charge transfer in the carboxyl and amino-functionalized carbon ***,an evaporation-driven charge transport mechanism is proposed for the induced electricity mediated by the coupling between water molecules and charge carriers in the *** results reveal the important role of direct interaction between water molecules and materials,deepening our understanding of the mechanism for evaporation-induced hydrovoltaic effect beyond streaming potential.

关键词： evaporation-induced electricity streaming potential hydrovoltaic effect charge transfer

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Characterization of polysulfone hollow-fiber ultrafiltration membrane and its cleaning efficiency by streaming potential and flux method

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Journal of Central South University 2009年第2期16卷 195-200页

作者：邱运仁缪畅叶红齐 School of Chemistry and Chemical Engineering Central South University

Polysulfone(PS)hollow-fiber ultrafiltration membrane was characterized combined with flux and streaming potential in single electrolyte *** effects of trans-membrane pressure,electrolyte concentration,ion valence and pH value of electrolyte solution on the streaming potential(SP)of the membrane were *** zeta potential and surface charge density of the membrane were calculated on the basis of Helmholtz-Smoluchowski equation and Gouy-Chapmann *** results indicate that the valence and concentration of cation have a greater influence on the SP and surface charge density of PS membrane than those of anion,and the pH value of electrolyte solution has great effects on the SP and zeta potential of the membrane surface. Both the absolute value of the streaming potential and water flux of the adsorbed membrane decrease,compared with those of the clean *** streaming potential and flux of the cleaned membrane can be completely recovered by cleaning with the mass fraction of 0.8%EDTA at pH=10.

关键词： hollow fiber membrane polysulfone ultrafiltration streaming potential cleaning

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Discontinuous streaming potential via liquid gate

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eScience 2022年第6期2卷 615-622页

作者： Jian Zhang Kan Zhan Shusong Zhang Yigang Shen Yaqi Hou Jing Liu Yi Fan Yunmao Zhang Shuli Wang Yanbo Xie Xinyu Chen Xu Hou State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Institute of Artificial Intelligence Xiamen UniversityXiamen361005China School of Physical Science and Technology Northwestern Polytechnical UniversityXi'an710072China School of Aeronautics and Institute of Extreme Mechanics Northwestern Polytechnical UniversityXi'an710072China Fujian Engineering Research Center for Solid-State Lighting Department of Electronic ScienceSchool of Electronic Science and EngineeringXiamen UniversityXiamen361005China College of Physical Science and Technology Xiamen UniversityXiamen361005China Office of International Cooperation and Exchange Xiamen UniversityXiamen361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen361005China

streaming potential is mainly related to electrokinetic energy conversion,which has been considered to show promising potential for advanced technologies,especially *** inherent property of streaming potential is that the energy conversion process is always a continuous ***,practical applications include many cases of discontinuous states,such as nonlinear ***,we report a discontinuous streaming potential electrokinetic energy conversion fluid *** and theoretical calculations reveal that this system exhibits a discontinuous electrokinetic effect and provides a gating liquid slip in micropores,offering the advantages of gating liquid charge coupling and interfacial drag ***,the system is demonstrated in a wearable fall-down alert *** expect this liquid gating energy conversion system to open up a platform for the design and application of autonomous health monitoring devices,seismic sea wave warning systems,and beyond.

关键词： Liquid gating technology Electrokinetic effect Membrane science Discontinuous behavior streaming potential

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Theoretical research on geoelectric anomaly caused by streaming potential during earthquake preparation

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Acta Seismologica Sinica(English Edition) 2001年第4期14卷 425-433页

作者： ZHU Tao 1. Seismic Data and Information Center China Seismological Bureau 100045 Beijing China 2. Lanzhou Institute of Seismology China Seismological Bureau 730000 Lanzhou China

The surface streaming potential anomalies (SSPA) for a buried symmetrical pressure source in homogeneous and anisotropic layered half space are calculated separately in this paper. The results show that the maximum of SSPA calculated using the two models are reasonable and are about several hundred mV. The range in which SSPA can be detected on the earth's surface varies with the intensity of medium anisotropy. Anisotropic crack is introduced to calculate the magnitude of SSPA, so theoretically the contradiction between observation data and theoretical results is interpreted more reasonably.

关键词： streaming potential geoelectric anomaly anisotropic crack P319

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Recent Advances in Fibrous Materials for Hydroelectricity Generation

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Nano-Micro Letters 2025年第2期17卷 109-133页

作者： Can Ge Duo Xu Xiao Feng Xing Yang Zheheng Song Yuhang Song Jingyu Chen Yingcun Liu Chong Gao Yong Du Zhe Sun Weilin Xu Jian Fang College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123People’s Republic of China National Engineering Laboratory for Modern Silk Soochow UniversitySuzhou 215123People’s Republic of China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200People’s Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123People’s Republic of China Department of Electrical and Computer Engineering University of MassachusettsAmherstMA 01003USA Department of Materials Imperial College LondonSouth Kensington CampusLondon SW72AZUK College of Textile Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China School of Materials Science and Engineering Shanghai Institute of Technology100 Haiquan RoadShanghai 201418People’s Republic of China

Depleting fossil energy sources and conventional polluting power generation pose a threat to sustainable *** generation from ubiquitous and spontaneous phase transitions between liquid and gaseous water has been considered a promising strategy for mitigating the energy *** materials with unique flexibility,processability,multifunctionality,and practicability have been widely applied for fibrous materials-based hydroelectricity generation(FHG).In this review,the power generation mechanisms,design principles,and electricity enhancement factors of FHG are first ***,the fabrication strategies and characteristics of varied constructions including 1D fiber,1D yarn,2D fabric,2D membrane,3D fibrous framework,and 3D fibrous gel are ***,the advanced functions of FHG during water harvesting,proton dissociation,ion separation,and charge accumulation processes are analyzed in ***,the potential applications including power supply,energy storage,electrical sensor,and information expression are also ***,some existing challenges are considered and prospects for future development are sincerely proposed.

关键词： Hydroelectricity Fibrous material streaming potential Ion diffusion

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Electrokinetic energy conversion of electro-magneto-hydro-dynamic nanofluids through a microannulus under the time-periodic excitation

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Applied Mathematics and Mechanics(English Edition) 2021年第7期42卷 1029-1046页

作者： Guangpu ZHAO Jiali ZHANG Zhiqiang WANG Yongjun JIAN College of Sciences Inner Mongolia University of TechnologyHohhot 010051China Transportation Institute Inner Mongolia UniversityHohhot 010021China School of Mathematical Science Inner Mongolia UniversityHohhot 010021China

In this work,the effects of externally applied axial pressure gradients and transverse magnetic fields on the electrokinetic energy conversion(EKEC)efficiency and the streaming potential of nanofluids through a microannulus are *** analytical solution for electro-magneto-hydro-dynamic(EMHD)flow is obtained under the condition of the Debye-Huuckel ***,Green’s function method is used to obtain the analytical solutions of the velocity *** result shows that the velocity distribution is characterized by the dimensionless frequency?,the Hartmann number Ha,the volume fraction of the nanoparticlesφ,the geometric radius ratio a,and the wallζpotential ratio ***,the effects of three kinds of periodic excitations are compared and *** results also show that the periodic excitation of the square waveform is more effective in increasing the streaming potential and the EKEC *** is worth noting that adjusting the wallζpotential ratio and the geometric radius ratio can affect the streaming potential and the EKEC efficiency.

关键词： electrokinetic energy conversion(EKEC)efficiency nanofluid streaming potential magnetic field time-periodic excitation

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Electrokinetic flow and energy conversion in a curved microtube

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Applied Mathematics and Mechanics(English Edition) 2022年第8期43卷 1289-1306页

作者： Zhaodong DING Kai TIAN Yongjun JIAN School of Mathematical Science Inner Mongolia UniversityHohhot010021China

Curved channels are ubiquitous in microfluidic *** pressure-driven electrokinetic flow and energy conversion in a curved microtube are investigated analytically by using a perturbation analysis method under the assumptions of the small curvature ratio and the Reynolds *** results indicate that the curvature of the microtube leads to a skewed pattern in the distribution of the electrical double layer(EDL)*** EDL potential at the outer side of the bend is larger than that at the inner side of the *** curvature shows an inhibitory effect on the magnitude of the streaming potential field induced by the pressure-driven *** the spanwise pressure gradient is dominant over the inertial force,the resulting axial velocity profile is skewed into the inner region of the curved ***,the flow rate in a curved microtube could be larger than that in a straight one with the same pressure gradient and shape of cross *** asymptotic solutions of the axial velocity and flow rate in the absence of the electrokinetic effect are in agreement with the classical results for low Reynolds number ***,the curved geometry could be beneficial to improving the electrokinetic energy conversion(EKEC)efficiency.

关键词： electrokinetic flow streaming potential electrokinetic energy conversion(EKEC) perturbation analysis method curved microchannel

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Electrokinetic phenomena of poly(vinyl butyral) hollow fiber membranes in different electrolyte solutions

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Journal of Central South University 2013年第6期20卷 1490-1495页

作者：漆静王永前邱运仁 School of Chemistry and Chemical Engineering Central South University Key Laboratory of Resources Chemistry of Nonferrous of Ministry of Education(Central South University)

The streaming potential of poly（vinyl butyral）（PVB） hollow fiber membrane was studied in different electrolyte solutions （including NaCl, KCl, CaCl2 and MgCl2）, the effects of ionic strength, ion valence and pH value on the streaming potential （SP） of the membrane were investigated. The zeta potentials and surface charge densities of the membrane were estimated on the basis of Helmholtz-Smoluchowski equation and Gouy-Chapmann theory. The results show that the PVB membrane has a weak negative charge due to the specific adsorption of ions. Moreover, the streaming potential, the zeta potential and the surface charge density of the membrane depend strongly on the salt concentration and the type and valence of ions. The iso-electric point （IEP） of the PVB membrane is arotmd 3.0 in the monovalent media （NaC1 and KC1） and 3.5 in divalent electrolytes （CaCl2 and MgCl2）. A few retentions were obtained for PVB membrane in low concentration solutions. This result verifies that the negative charged membrane surface can reject inorganic solutes by means of electrostatic repulsion effect even though the size of membrane pores is much larger than the size of salts.

关键词： streaming potential zeta potential poly(vinyl butyral) hollow fiber membrane

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Influence of Electric Double Layer on Lubrication

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Journal of Wuhan University of Technology(Materials Science) 2004年第B10期19卷 66-68页

作者：白少先 South China University of Technology

A mathematical model of lubrication with the electric double layer (EDL) was put forward in order to study the influence of *** lubrication tests with a composite sliding block and a disk were carried out with oleic acid used as an additive to strengthen *** streaming potential and friction force were measured. The experimental results show that the EDL has an apparent effect on the frictional force, which increases the ability of forming lubrication film.

关键词： electric double layer streaming potential electro-viscosity

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Effects of operating conditions on membrane charge property and nanofiltration

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Frontiers of Chemical Science and Engineering 2011年第4期5卷 492-499页

作者： Li XU Li-Shun DU Jing HE School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Membrane Science and Desalination Technology Tianjin UniversityTianjin 300072China Lanpec Technologies Co. Ltd.Tianjin 300072China

The effects of the operating pressure,crossﬂow velocity,feed concentration,and temperature on the streaming and Zeta potential of the membranes were *** permeateﬂux and the retention rate under different nanoﬁltration operating conditions were also *** results show that the higher pressure,feed concentration,temperature,and lower crossﬂow velocity lead to the higher absolute value of streaming and Zeta *** permeateﬂux of the nanoﬁltration decreases with the feed concentration and increases with not only the pressure but also the crossﬂow velocity and *** higher the pressure and the crossﬂow velocity,the higher the retention *** lower feed concentration and higher temperature leads to lower retention *** effects of the operating conditions on the permeateﬂux and the retention rate were explained by the variation of the membrane charge property.

关键词： nanoﬁltration membrane streaming potential Zeta potential permeateﬂux retention rate

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