Download or read book Electrokinetic Flows in a Charged Microcapillary Model Membrane written by Wei-hu Koh and published by . This book was released on 1977 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrokinetic Flow in Capillary Elements written by David Burgreen and published by . This book was released on 1963 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report contains a general analytical study of electrokinetic flow in channels. It includes the study of electroosmotic flow and the generation of streaming potential. The first part of the report consists of a presentation of the double layer theory and of the diffuse layer theory. An attempt was made to keep the analytical treatment explicit. Particular solutions are developed for the case of small ratios of surface ionic energy to thermal energy and for the case of large capillary radius. The report also contains an analytical study of electrokinetic flow in very fine capillaries. The results of the study suggest the possibility of the practical application of electrokinetic phenomena in pumping, power generation, and instrumentation. The last part of the report examines the efficiencies of the electrokinetic processes and discusses their application. (Author).
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1980 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Studies of Models for Electrokinetic Flow and Charged Solute Transport in Periodic Porous Media written by Florian Frank and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrokinetics and Electrohydrodynamics in Microsystems written by Antonio Ramos and published by Springer Science & Business Media. This book was released on 2011-09-20 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the most promising techniques to handle small objects at the micrometer scale are those that employ electrical forces, which have the advantages of voltage-based control and dominance over other forces. The book provides a state-of-the-art knowledge on both theoretical and applied aspects of the electrical manipulation of colloidal particles and fluids in microsystems and covers the following topics: dielectrophoresis, electrowetting, electrohydrodynamics in microsystems, and electrokinetics of fluids and particles. The book is addressed to doctoral students, young or senior researchers, chemical engineers and/or biotechnologists with an interest in microfluidics, lab-on-chip or MEMS.
Download or read book Nanoscience written by Victor M. Starov and published by CRC Press. This book was released on 2011-06-03 with total page 1610 pages. Available in PDF, EPUB and Kindle. Book excerpt: The common perception is that nanoscience is something entirely new, that it sprung forth whole and fully formed like some mythological deity. But the truth is that like all things scientific, nanoscience is the natural result of the long evolution of scientific inquiry. Following a historical trail back to the middle of the 19th century, nanoscience is the inborn property of colloid and interface science. What’s important today is for us to recognize that nanoparticles are small colloidal objects. It should also be appreciated that over the past decades, a number of novel nanostructures have been developed, but whatever we call them, we cannot forget that their properties and behavior are still in the realm of colloid and interface science. However one views it, the interest and funding in nano-science is a tremendous opportunity to advance critical research in colloid chemistry. Nanoscience: Colloidal and Interfacial Aspects brings together a prominent roster of 42 leading investigators and their teams, who detail the wide range of theoretical and experimental knowledge that can be successfully applied for investigating nanosystems, many of which are actually well-known colloidal systems. This international grouping of pioneering investigators from academia and industry use these pages to provide researchers of today and tomorrow with a full examination of nano-disperse colloids, homogeneous and heterogeneous nano-structured materials (and their properties), and shelf-organization at the nano-scale. This cutting-edge reference provides information on investigations into non-linear electrokinetic phenomena in nano-sized dispersions and nano-sized biological systems. It discusses application aspects of technological processes in great detail, providing scientists and engineers across all fields with authoritative commentary on colloid and interface science operating at the nanoscale. Nano-Science: Colloidal and Interfacial Aspects provides an authoritative resource for those wanting to familiarize themselves with current progress as well as for those looking to make their own impact on the development of new technologies and practical applications in fields as diverse as medicine, materials, and environmental science to name but a few. Whether you call the technology nano or colloids, the field continues to be ripe with opportunity.
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1976 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Directed Electrokinetic Flows in Microfluidic Devices written by Mehmet Basar Karacor and published by . This book was released on 2009 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electroosmotic flow control in microfluidic devices is an important and challenging problem, as electroosmosis directly influences separation efficiencies in lab-on-chip applications. In this study, a non-mechanical passive flow directing method is presented for electrokinetically driven flow. Due to the high surface-area-to-volume (SA/V) ratio, surface properties dominate the flow in microfluidic channels. For electrokinetically driven flows, the main surface property affecting electroosmotic flows is the surface [zeta] potential, which is related to the effective surface charge density. By changing the effective surface charge density, the electroosmotic flow rates of charged species can be controlled in microfluidic channels. In this work, to change the effective surface charge density, surfaces were chemically modified with --Br, --NH2 and --CH3 functional groups by "click" chemistry. Since these functional surface layers are integrated within model glass microfluidic devices prepared by standard microfabrication procedures, the first step was to investigate the stability of the adherent surface layers to a variety of microfabrication conditions. A model "Y" shaped glass microfluidic device was developed. One leg of this model microfluidic device was selectively chemically modified to alter the [zeta] potential and thereby increase or decrease the electroosmotic flow with respect to rest of the device. Electroosmotic flow is visualized by using marker dyes under a fluorescent microscope. In addition, experiments were validated by using the CFD code in COMSOL. The experiments concluded that the surface layers are stable to a variety of conditions including a wide pH range (pH 3 -- pH 11), solvent exposure, acid and base exposure, and UV light. Extreme conditions such as a piranha solution or oxidative plasma degrade the surface layers. Electrokinetic flow experiments show that depending on the charge of a species the electroosmotic flow is preferentially directed as a function of the [zeta] potential in the microfluidic channels.
Download or read book Electrokinetic Flow in Micro and Nano fluidic Components written by Zhi Zheng and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In this work, electrokinetic flow through nano- and micro-channels is investigated. The governing equations for the flow in three dimensional channels are derived from Poisson-Nernst-Planck theory. The boundary conditions for the governing equations are obtained from the electrochemical equilibrium requirements. The results are compared with three sets of experimental data, provided by iMEDD inc., Oak Ridge National Laboratory, and Georgia Institute of Technology. The results of comparison are extremely good. A finite difference method is used to solve the governing equations numerically. For asymptotic cases, the governing equations are solved analytically using singular perturbation method. The results show that multivalent counterions decrease the electroosmotic flow extraordinarily. Scaling laws for the governing equations are introduced which clarify that several dimensionless parameters determine the potential and velocity profiles and the distribution patterns of ion species. The relationship between the channel surface charge density and the zeta potential is explored. The diffusive fluxes, electric migrational fluxes and convective fluxes of different ion species in the electrokinetic flow are obtained from the governing equations. Results are also obtained for electroosmosis in 2D nanochannels. At the end of this work, the governing equations for unsteady flow are derived, the transport of macromolecules through micro- and nano- channels is discussed and the future work in these areas is suggested.
Download or read book Electrokinetic Phenomena in Sub micron Pores written by Wei-hu Koh and published by . This book was released on 1975 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Saline Water Conversion Report for written by and published by . This book was released on 1962 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Non equilibrium Thermodynamics written by and published by . This book was released on 1991 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Induced charge Electrokinetic Motion of a Heterogeneous Particle and Its Corresponding Applications written by Yasaman Daghighi and published by . This book was released on 2013 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis conducts numerical and experimental studies of the nonlinear electrokinetic motion of heterogeneous particles in microfluidic systems and their corresponding applications in laboratory-on-a-chip (LOC) systems. Induced-charge electrokinetic (ICEK) phenomena flow is generated by applying an external electric field to a conducting particle immersed in an aqueous solution. As a result of this field, micro-vortices form around the conducting particle. Using this phenomenon, many shortcomings of classical electrokinetics (e.g. poor mixing, leakage, back flow problem) can be improved. This thesis proposes and investigates a complete 3-D numerical multi-physics method to calculate the induced zeta potential on the conducting surface of a heterogeneous object. To model the ICEK motion of a heterogeneous particle in a DC electric field, the moving grid technique is used to conduct the particle-fluid simulation. It was numerically shown that the vortices form near the conducting surface of a particle. Both transitional and rotational motions of heterogeneous particles are investigated. A set of novel experiments are designed and conducted to investigate several aspecs of ICEK. It is demonstrated for the first time that four vortices form around a conducting sphere in contact with an aqueous solution while the DC electric field is applied. The motions of heterogeneous particles are experimentally studied. The speed of a heterogeneous particle is compared with the same size non-conducting particle under the same experimental conditions and it is shown that the heterogeneous particle moves significantly faster than the non-conducting particle. It is also shown that the micro-vortices on the conducting section of the heterogeneous particle act like an engine and push the particle to move faster. These experiments verify the results of our simulation studies. We introduce three applications for induced-charge electrokinetic phenomena in ths thesis: ICEK micro-valve, ICEK micro-mixer, and ICEK micro-motor, which can be used in microfluidics and lab-on-a-chip devises. This ICEK micro-valve significantly improves many shortcomings of other micro-valves reported in the literature (such as leakage, considerable dead volume and complicated fabrication processes). Our ICEK micro-mixers take the advantages of induced micro-vortices and boost the mixing process in a micro-channel. As a result well mixed homogeneous (100%) mixture could be obtained at the downstream of the mixer. Our proposed no-contact ICEK micro-motor rotates as long as the DC electric field is being applied. This thesis develops a new understanding of several ICEK phenomena and applications related to heterogeneous particles. The 3D numerical model developed in this thesis along with the experimental studies are capable of describing the ICEK motion of a heterogeneous particle and is a considerable step to calculate the ICEK phenomena for real-world applications. This thesis, for the first time, experimentally visualized and verified the induced micro-vortices around conducting particles under applied DC electric field. The proposed ICEK micro-mixers, valve and motor can be used in various LOC devices and applications.
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrokinetic Remediation for Environmental Security and Sustainability written by Alexandra B. Ribeiro and published by John Wiley & Sons. This book was released on 2021-03-05 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrokinetic Remediation for Environmental Security and Sustainability Explore this comprehensive reference on the remediation of contaminated substrates, filled with cutting-edge research and practical case studies Electrokinetic Remediation for Environmental Security and Sustainability delivers a thorough review of electrokinetic remediation (EKR) for the treatment of inorganic and organic contaminants in contaminated substrates. The book highlights recent progress and developments in EKR in the areas of resource recovery, the removal of pollutants, and environmental remediation. It also discusses the use of EKR in conjunction with nanotechnology and phytoremediation. Throughout the book, case studies are presented that involve the field implementation of EKR technologies. The book also includes discussions of enhanced electrokinetic remediation of dredged co-contaminated sediments, solar-powered bioelectrokinetics for the mitigation of contaminated agricultural soil, advanced electro-fenton for remediation of organics, electrokinetic remediation for PPCPs in contaminated substrates, and the electrokinetic remediation of agrochemicals such as organochlorine compounds. Other topics include: A thorough introduction to the modelling of electrokinetic remediation An exploration of the electrokinetic recovery of tungsten and removal of arsenic from mining secondary resources An analysis of pharmaceutically active compounds in wastewater treatment plants with a discussion of electrochemical advanced oxidation as an on-site treatment A review of rare earth elements, including general concepts and recovery techniques, like electrodialytic extraction A treatment of hydrocarbon-contaminated soil in cold climate conditions Perfect for environmental engineers and scientists, geologists, chemical engineers, biochemical engineers, and scientists working with green technology, Electrokinetic Remediation for Environmental Security and Sustainability will also earn a place in the libraries of academic and industry researchers, engineers, regulators, and policy makers with an interest in the remediation of contaminated natural resources.
Download or read book Saline Water Conversion Report written by and published by . This book was released on 1960 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrokinetic Flow in Capillary Elements written by and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
