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Micromechanical computational modeling of hydration swelling of montmorillonite
Published in C. Di Maio, T. Hueckel, B. Loret, Chemo-Mechanical Coupling in Clays, 2018
When advected by the streaming velocity of the fluid, the excess in mobile charge population in the counter-ion atmosphere lead to macroscopic observed electrokinetic phenomena such as streaming currents, which result from the influence of fluid movement upon charge flow. Moreover, to conserve charge, the movement of the net charge generates an electric potential, often referred to as streaming potential, which gives rise to other macroscopic electrokinetic phenomena. The spatial variability of this quantity engenders electrophoretic movement inducing a conduction Ohmic current which opposes the streaming current consequently slowing down the counter-ions of the diffuse double layer. Due to the viscous drag interaction, the ions pull the liquid with them resulting in a concomitant electro-osmotic seepage flow opposing the pressure-gradient driven flow. In addition to electrokinetic phenomena, flow driven by chemical-osmotic effects (gradient of the Nernst potentials) is also manifested particularly when the salinity varies spatially (Gu et al. (1998)).
Science of Colloidal Processing
Published in M. N. Rahaman, Ceramic Processing and Sintering, 2017
Electrokinetic phenomena involve the combined effects of motion and an electric field. When an electric field is applied to a colloidal suspension, the particles move with a velocity that is proportional to the applied field strength. The motion is called electrophoresis. It is a valuable source of information on the sign and magnitude of the charge and on the potential associated with the double layer. The measured potential, called the ζ potential, is an important guide to the stability of lyophobic colloids (25). The most widely used method for measuring the ζ potential is the microelectrophoretic technique, in which the motion of individual particles is followed in a microscope. The technique is used with very dilute suspensions. Modern instrumentation provides for automated, rapid measurements and for the use of concentrated suspensions.
Science of Colloidal Processing
Published in Mohamed N. Rahaman, Ceramic Processing, 2017
Electrokinetic phenomena involve the combined effects of motion and an electric field. When an electric field is applied to a colloidal suspension, the particles move with a velocity that is proportional to the applied field strength. The motion is called electrophoresis. It is a valuable source of information on the sign and magnitude of the charge and on the potential associated with the double layer. The measured potential, called the ζ potential, is an important guide to the stability of lyophobic colloids [25]. A widely used method for measuring the ζ potential is the microelectro- phoretic technique, in which the motion of individual particles is followed in a microscope. The technique is used with very dilute suspensions. Modern instrumentation provides for automated, rapid measurements and for the use of concentrated suspensions.
Electroosmosis peristaltic flow with the domination of internal and activation energies for non-Newtonian fluid
Published in Waves in Random and Complex Media, 2022
Electroosmosis is the phenomenon of electrokinetics. Electrokinetic phenomena involvefluid motion adjacent to the charged surface applying an electric field. Some examples include electroosmosis, electrophoresis, streaming potential, and zeta potential. Since electroosmosis is easy to perform, the initial research on electrokinetics relied on electroosmosis. The topic was first considered by Reuss [1] in 1809. Electroosmosis has various applications in microfluidic devices. In the 1980s, a microfluidic device like Micro Electro Mechanical System was first introduced. Microfluidic appliances are widely applied in science and technology, biotechnology, biomedical, chemical industry [2], microelectronic cooling systems, microfluidic chromatography, microenergy system [3], microbiological sensor, biological, and medical industries to produce chip devices. The capacity of lab-on-chip instruments for biochemical synthesis, study, and screening are reviewed by biochemists, synthetic chemists, and physicians [4]. In biological, industrial, and medical processes electroosmosis has a vital role. Zhang et al. [5] studied electroosmosis in capillaries. Qi and Ng. [6] analyzed the electroosmotic flow between two parallel plates. More literature on electroosmosis in different flow patterns can be cited through Refs. [7–9].