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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:12 |
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Conference: Bucharest University Faculty of Physics 2009 Meeting
Section: Solid State Physics and Materials Science
Title:
Modelling of the low-frequency solvent dielectric permittivity in nanochannels in the electrical double layer length range
Authors:
Ana Ioanid
Affiliation:
Faculty of Physics, University of Bucharest
E-mail
ana_ioanid@yahoo.com
Keywords:
nanofluidics, electrical double layer, ionic strength, low-frequency permittivity
Abstract:
Nanofluidics is a new dynamic field with relevant results for many areas in nanoscience and nanotechnology. Nanofluidics is defined as the study and application of fluids flow in and around nanometer seized objects with at least one characteristic dimension below 100 nm. Their methods permet using single-molecule modes of molecular manipulation for complex analysis as in micro total analysis systems (µTAS). For exemple, the molecules can be controlled by charge in nanochannels because of their electrostatic interactions with the electrical double layer (EDL), a shielding layer that is naturally created within the liquid near a charged surface. The thickness of the EDL is given by the characteristic Debye length what grows less with the ionic strength defined by half summ products of concentration with square of charge for all the solvent ions (ions, counterions, charged molecules).
In this work we propose a model for solvent low-frequency permittivity profile taking into account both the electrode and solvent properties.
Keywords: nanofluidics, electrical double layer, ionic strength, low-frequency permittivity.
15 May 2009
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