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Research Conducted at Institute Max von Laue - Paul Langevin Has Updated Our Knowledge about Electrokinetics (Molecular dynamics simulation of...

July 15, 2014



Research Conducted at Institute Max von Laue - Paul Langevin Has Updated Our Knowledge about Electrokinetics (Molecular dynamics simulation of electrokinetic flow of an aqueous electrolyte solution in nanochannels)

By a News Reporter-Staff News Editor at Physics Week -- Investigators publish new report on Electrokinetics. According to news reporting from Grenoble, France, by VerticalNews journalists, research stated, "Electrokinetic flows of an aqueous NaCl solution in nanochannels with negatively charged surfaces are studied using molecular dynamics simulations. The four transport coefficients that characterize the response to weak electric and pressure fields, namely, the coefficients for the electrical current in response to the electric field (M-jj) and the pressure field (M-jm), and those for the mass flow in response to the same fields (M-mj and M-mm), are obtained in the linear regime using a Green-Kubo approach."

The news correspondents obtained a quote from the research from Institute Max von Laue - Paul Langevin, "Nonequilibrium simulations with explicit external fields are also carried out, and the current and mass flows are directly obtained. The two methods exhibit good agreement even for large external field strengths, and Onsager's reciprocal relation (M-jm = M-mj) is numerically confirmed in both approaches. The influence of the surface charge density on the flow is also considered. The values of the transport coefficients are found to be smaller for larger surface charge density, because the counter-ions strongly bound near the channel surface interfere with the charge and mass flows."

According to the news reporters, the research concluded: "A reversal of the streaming current and of the reciprocal electro-osmotic flow, with a change of sign of M-mj due to the excess co-ions, takes places for very high surface charge density."

For more information on this research see: Molecular dynamics simulation of electrokinetic flow of an aqueous electrolyte solution in nanochannels. Journal of Chemical Physics, 2014;140(21):442-453. Journal of Chemical Physics can be contacted at: Amer Inst Physics, Circulation & Fulfillment Div, 2 Huntington Quadrangle, Ste 1 N O 1, Melville, NY 11747-4501, USA. (American Institute of Physics - www.aip.org/; Journal of Chemical Physics - jcp.aip.org/)

Our news journalists report that additional information may be obtained by contacting H. Yoshida, Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. Additional authors for this research include H. Mizuno, T. Kinjo, H. Washizu and J.L. Barrat.

Keywords for this news article include: France, Europe, Physics, Grenoble, Nanochannels, Nanotechnology, Electrokinetics, Molecular Dynamics, Emerging Technologies

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Physics Week


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