22
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Active, Reactive, and Apparent Power in Dielectrophoresis: Force Corrections from the Capacitive Charging Work on Suspensions Described by Maxwell-Wagner’s Mixing Equation

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          A new expression for the dielectrophoresis (DEP) force is derived from the electrical work in a charge-cycle model that allows the field-free transition of a single object between the centers of two adjacent cubic volumes in an inhomogeneous field. The charging work for the capacities of the volumes is calculated in the absence and in the presence of the object using the external permittivity and Maxwell-Wagner’s mixing equation, respectively. The model provides additional terms for the Clausius-Mossotti factor, which vanish for the mathematical boundary transition toward zero volume fraction, but which can be interesting for narrow microfluidic systems. The comparison with the classical solution provides a new perspective on the notorious problem of electrostatic modeling of AC electrokinetic effects in lossy media and gives insight into the relationships between active, reactive, and apparent power in DEP force generation. DEP moves more highly polarizable media to locations with a higher field, making a DEP-related increase in the overall polarizability of suspensions intuitive. Calculations of the passage of single objects through a chain of cubic volumes show increased overall effective polarizability in the system for both positive and negative DEP. Therefore, it is proposed that DEP be considered a conditioned polarization mechanism, even if it is slow with respect to the field oscillation. The DEP-induced changes in permittivity and conductivity describe the increase in the overall energy dissipation in the DEP systems consistent with the law of maximum entropy production. Thermodynamics can help explain DEP accumulation of small objects below the limits of Brownian motion.

          Related collections

          Most cited references37

          • Record: found
          • Abstract: not found
          • Article: not found

          Ac electrokinetics: a review of forces in microelectrode structures

            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Erklärung der dielektrischen Nachwirkungsvorgänge auf Grund Maxwellscher Vorstellungen

              Bookmark
              • Record: found
              • Abstract: not found
              • Book: not found

              A Treatise on Electricity and Magnetism

                Bookmark

                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Micromachines (Basel)
                Micromachines (Basel)
                micromachines
                Micromachines
                MDPI
                2072-666X
                23 June 2021
                July 2021
                : 12
                : 7
                : 738
                Affiliations
                Department of Biophysics, University of Rostock, Gertrudenstr. 11A, 18057 Rostock, Germany; jan.gimsa@ 123456uni-rostock.de ; Tel.: +49-381-6020; Fax: +49-381-6022
                Author information
                https://orcid.org/0000-0003-1495-9434
                Article
                micromachines-12-00738
                10.3390/mi12070738
                8305549
                34201745
                6f16ee7a-b03b-4be2-9201-1d01f70d033c
                © 2021 by the author.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( https://creativecommons.org/licenses/by/4.0/).

                History
                : 18 May 2021
                : 21 June 2021
                Categories
                Article

                dep force in narrow volumes,capacitor charge cycle,micro-fluidic volumes,dep trajectories,2d and 3d modelling,dep-induced polarizability increase,conditioned polarization,lossy dispersive materials,thermodynamics,rayleigh’s dissipation function,law of maximum entropy production (lmep)

                Comments

                Comment on this article