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Relevant bibliographies by topics / Electro-osmotic measurements

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Academic literature on the topic 'Electro-osmotic measurements'

Author: Grafiati

Published: 5 June 2025

Last updated: 24 June 2025

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Journal articles on the topic "Electro-osmotic measurements"

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Miyamoto, Manabu, Takashi Nakahari, Hideyo Yoshida, and Yusuke Imai. "Electro-osmotic flow measurements." Journal of Membrane Science 41 (February 1989): 377–91. http://dx.doi.org/10.1016/s0376-7388(00)82415-1.

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Botin, Denis, Jennifer Wenzl, Ran Niu, and Thomas Palberg. "Colloidal electro-phoresis in the presence of symmetric and asymmetric electro-osmotic flow." Soft Matter 14, no. 40 (2018): 8191–204. http://dx.doi.org/10.1039/c8sm00934a.

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Petrovick, John G., Douglas I. Kushner, Priyamvada Goyal, Clayton J. Radke, and Adam Z. Weber. "Investigating the Electro-Osmotic Coefficients of PFSA and Anion-Exchange Ionomers Using Microelectrodes." ECS Meeting Abstracts MA2023-02, no. 39 (2023): 1907. http://dx.doi.org/10.1149/ma2023-02391907mtgabs.

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The electro-osmotic coefficient of ionomer membranes is a significant water management property that quantifies the number of water molecules dragged with the mobile ion (typically a proton) when that ion moves due to the operation of an electrochemical cell or an electric field. This coefficient becomes critical when attempting to model water distribution and movement in fuel cells and electrolyzers, where water is an important factor influencing device performance. However, there is disagreement on the value of the electro-osmotic coefficient for PFSA membranes and little significant study of the coefficient in anion exchange membranes (AEMs). Here we present an electrochemical, two-electrode method of determining the electro-osmotic coefficient of ionomers using differential relative humidity (RH) measurements. This approach allows for more accurate determination of the electro-osmotic coefficient. We present the electro-osmotic coefficient as a function of temperature and mobile ion for a variety of ionomers, including Nafion, sulfonated polystyrene, Versogen,, and Sustainion. In addition, a model based on the Maxwell-Stefan-Onsager framework is developed for the AEMs, enabling calculation of the membrane water permeability via fitting of the electro-osmotic coefficient. These coefficients will allow for more accurate models of water transport in electrochemical systems, leading to a greater understanding of the inefficiencies in these systems and, hopefully, insight into how to improve them. This work was supported by the HydroGEN Advanced Water Splitting Materials consortium, which is supported by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Hydrogen and Fuel Cell Technologies Office, under contract number DE-AC02-05CH11231.

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Kim, M. J., and K. D. Kihm. "Microscopic PIV measurements for electro-osmotic flows in PDMS microchannels." Journal of Visualization 7, no. 2 (2004): 111–18. http://dx.doi.org/10.1007/bf03181583.

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Ben Salah, M., H. Souli, P. Dubujet, M. Hattab, and M. Trabelsi Ayadi. "Experimental study of the electrokinetic behaviour of kaolinite–smectite mixtures." Soil Research 55, no. 8 (2017): 743. http://dx.doi.org/10.1071/sr16267.

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The evolution of the behaviour of kaolinite–smectite mixtures was studied using mechanical and electrokinetic tests. Oedometric tests showed that the compression index of the mixtures increases with increasing smectite percentage and that the curves feature a double slope in the [log σv,e] (where σv is the vertical mechanical stress and e is the void ratio) coordinate system when the percentage of smectite is strictly higher than 25%. Electrokinetic tests show that, of smectite the electrical conductivity and electro-osmotic flow tend towards that of the smectite. Measurements performed after the electrokinetic tests showed that the pH and conductivity are constant when the amount of smectite is lower than 25%. For higher smectite content, acidification of the medium is not totally obtained and the electrical conductivity is higher near the anode because of the slow diffusion of H+ ions in the structure. The tests also highlight that the electro-osmotic permeability is affected by the hydraulic permeability, although the variation in electro-osmotic permeability remains small compared with that of hydraulic permeability.

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Sadr, Reza, Minami Yoda, Pradeep Gnanaprakasam, and A. Terrence Conlisk. "Velocity measurements inside the diffuse electric double layer in electro-osmotic flow." Applied Physics Letters 89, no. 4 (2006): 044103. http://dx.doi.org/10.1063/1.2234836.

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Hock, Vincent, Sean Morefield, and James B. Bushman. "Evaluating the Performance of the Electro-Osmotic Pulse Basement Dewatering System." Materials Performance 45, no. 1 (2006): 24–28. https://doi.org/10.5006/mp2006_45_1-24.

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An experiment was conducted to develop a relationship between a moisture content meter and resistivity. Concurrent measurements on a characterized concrete specimen were made using the moisture meter and 4-pin resistivity instrument as the block was progressively saturated. The relationship between moisture content and resistivity followed a strong correlation to a power law regression formula. The relationship between concrete resistivity and moisture content, with all other factors held constant, is presumed to follow the same logarithmic relationship found in clays.

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Plecis, Adrien, and Yong Chen. "Improved glass–PDMS–glass device technology for accurate measurements of electro-osmotic mobilities." Microelectronic Engineering 85, no. 5-6 (2008): 1334–36. http://dx.doi.org/10.1016/j.mee.2008.01.097.

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Audry, Marie-Charlotte, Agnès Piednoir, Pierre Joseph, and Elisabeth Charlaix. "Amplification of electro-osmotic flows by wall slippage: direct measurements on OTS-surfaces." Faraday Discussions 146 (2010): 113. http://dx.doi.org/10.1039/b927158a.

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Ren, Xiaoming, Thomas E. Springer, Thomas A. Zawodzinski, and Shimshon Gottesfeld. "Methanol Transport Through Nation Membranes. Electro-osmotic Drag Effects on Potential Step Measurements." Journal of The Electrochemical Society 147, no. 2 (2000): 466. http://dx.doi.org/10.1149/1.1393219.

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Dissertations / Theses on the topic "Electro-osmotic measurements"

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Chen, Kun-Che, and 陳坤澤. "Manufacrure and measurement of flow rate on an Electro-osmotic micropump." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/99003046533552813466.

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Book chapters on the topic "Electro-osmotic measurements"

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Huyghe, Jacques M., Charles F. Janssen, Yoram Lanir, Corrinus C. van Donkelaar, Alice Maroudas, and Dick H. van Campen. "Experimental measurement of electrical conductivity and electro-osmotic permeability of ionised porous media." In Porous Media. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04999-0_10.

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Conference papers on the topic "Electro-osmotic measurements"

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Cummings, Eric B. "PIV Measurement of Electro-Osmotic and Pressure-Driven Flow Components in Microfluidic Systems." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0294.

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Abstract Methodology and analysis software have been developed that produce high-spatial-resolution field measurements of depthwise uniform, linear shear, and parabolic components of the velocity from particle-image videos in which the depthwise direction is not resolved. These velocity components can be approximately identified with uniform electrokinetic flow, electrokinetic flow with a ζ-potential difference between the bottom and top surfaces, and pressure-driven flow, respectively. This software has extracted measurements of the uniform and parabolic components of mixed pressure-driven and electrokinetic particle flows over heterogeneous boundaries. This decomposition of flow components simplifies the interpretation of complicated microflows.

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Husar, Attila, Andrew Higier, and Hongtan Liu. "In-Situ Measurements of Water Transfer Due to Different Mechanisms in a PEM Fuel Cell." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41419.

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Water management is of critical importance in a proton exchange membrane (PEM) fuel cell. Yet there are very limited studies of water transfer through the membrane and no data are available for water transfer due to individual mechanisms through the membrane electrode assembly (MEA) in an operational fuel cell. Thus it is the objective of this study to measure water transfer through the MEA due to different mechanisms through the membrane electrode assembly (MEA) of an operational PEM fuel cell. The three different mechanisms of water transfer, i.e., electro-osmotic drag, diffusion and hydraulic permeation were isolated by specially imposed boundary conditions. Therefore water transfer through the MEA due to each mechanism could be measured separately. In this study, all the data were collected in an actual assembled operational fuel cell, and some of the data were collected while the fuel cell was generating power. The measured results showed that water transfer due to hydraulic permeation, i.e. the pressure difference between the anode and cathode is at least an order of magnitude lower than those due to other two mechanisms. The data for water transfers due to electro-osmosis and diffusion through the MEA are in good agreement with some of the data and model predications in the literature for the membrane. The methodology used in this study is simple and can be easily adopted for in-situ water transfer measurement due to different mechanisms in actual PEM fuel cells without any cell modifications.

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Suriyage, Nihal U., Muralidhar K. Ghantasala, Pio Iovenitti, and Erol C. Harvey. "Fabrication, measurement, and modeling of electro-osmotic flow in micromachined polymer microchannels." In Microelectronics, MEMS, and Nanotechnology, edited by Dan V. Nicolau, Uwe R. Muller, and John M. Dell. SPIE, 2004. http://dx.doi.org/10.1117/12.521576.

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Shahinpoor, Mohsen. "Electrically Controllable Deformations in Ionic Polymer Metal Composite Actuators." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39037.

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Ionic polymer metal composites (IPMC’s) exhibit spectacular coupling between electrical and mechanical domains. Sensing and actuation properties of these materials and the force and displacement characteristics have been investigated as a means of determining the electromechanical coupling coefficients of the material. An electric field applied across the thickness of the polymer causes electrophoretic ionic migration within the material. Electro-osmotic drag induces solvent migration in addition to the ion motion, and a stress is generated within the material causing the material to deform. This phenomenon is also reversible, making it possible to use ionic polymer materials as sensors, transducers and power generators. The salient feature of ionic polymeric materials, as compared to other electromechanical transducers such as piezoelectrics, is the large deformations that are achievable with low electric fields. Cantilever samples of ionic polymer material exhibit tip displacements on the order of their length with applied electric fields of the order of 10 volts per mm. Recent measurements of the motion of cantilever samples of ionic polymers have demonstrated a controllable, repeatable deformation in which the zero force position of the ionic polymer changes depending on the amplitude of the applied electric field. This effect appears to be controllable in the sense that the change in the zero force position of the polymer is a function of the amplitude of the applied electric field. It is also reversible to a degree because a step change in the voltage with the opposite polarity will change the shape of the ionic polymer strip back to a position that is close to the original position before cycling of the material. Thus, there is a potential to use this effect as a deformation memory mechanism within the polymer material. These observations and subsequent interpretations are reported in this presentation.

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Nishida, Kosuke, Yohma Yokoi, Shohji Tsushima, and Shuichiro Hirai. "Measurement of Water Distribution in Anode of Polymer Electrolyte Fuel Cell Under Low Humidity Conditions." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85128.

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During low humidity operation of polymer electrolyte fuel cells (PEFCs), water management in anode electrode is essential for achieving sufficient membrane hydration and high proton conductivity. In this study, the water vapor condensation in an operating PEFC under low humidity conditions was experimentally visualized by using water sensitive paper (WSP), and the water distribution on the anode side was investigated. WSP is a test paper for detecting water droplets, fog and high humidity, which is coated with a yellow surface. This test paper was inserted between the anode electrode and separator in the transparent fuel cell. Furthermore, the dew-point temperature at the anode outlet was simultaneously measured using a hygro-thermometer, and the effects of operating conditions and flow configuration on the water transports between the anode and cathode electrodes were discussed. It was found that the water vapor concentration on the anode side increases considerably after the startup because of the back diffusion of the product water, and the water condensation occurs from the downstream section of the anode channel in the co-flow arrangement. However, at high current densities, the amount of water in the anode decreases due to the water flux driven by electro-osmotic drag. The difference of the water vapor concentrations between the anode and cathode electrodes arises significantly with cell temperature, and the back diffusion flux of water toward the anode increases. The counter-flow pattern of anode and cathode gases is effective in achieving uniform water distribution in the anode flow field. The dry H2 at the anode inlet is humidified by the water diffused through the membrane from the cathode outlet, and thus sufficient water can be supplied all over the anode flow field.

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Reports on the topic "Electro-osmotic measurements"

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McNab, W., J. Karachewski, and G. Weismann. Field Measurements of Electro-osmotic Transport of Ground Water Contaminants in a Lithologically Heterogeneous Alluvial-Fan Setting. Office of Scientific and Technical Information (OSTI), 2001. http://dx.doi.org/10.2172/15006202.

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