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Characterization of slug flow of two aqueous phases by electrochemical impedance spectroscopy in a fluidic chip

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F18%3A43964124" target="_blank" >RIV/49777513:23640/18:43964124 - isvavai.cz</a>

  • Alternative codes found

    RIV/60461373:22340/18:43915898

  • Result on the web

    <a href="https://www.sciencedirect.com/science/article/pii/S0167931718301138#" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0167931718301138#</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.mee.2018.03.003" target="_blank" >10.1016/j.mee.2018.03.003</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Characterization of slug flow of two aqueous phases by electrochemical impedance spectroscopy in a fluidic chip

  • Original language description

    We adopted a method of electrochemical impedance spectroscopy (EIS) for the characterization of slug flow of two immiscible aqueous phases in a flow channel. The impedance response (both magnitude and phase shift) of the two-phase system is measured as a function of time at selected frequencies. The presence of slugs or a continuous phase at a pair of parallel facing electrodes can be determined under various signal frequencies mainly due to a significant difference in the electrolytic conductivities of both phases. We found that EIS data are sensitive to the total flowrate at low signal frequencies. Further, we suggested an equivalent electric circuit that takes into account all capacitances and resistances emerging between the two sensing electrodes. We determined the values of these elements by fitting a theoretical model to the experimental data. The obtained values of resistances were used to estimate the thicknesses of the wall film of the continuous phase that is present between a slug of the dispersed fluid and a channel wall. The estimates given by the EIS method were successfully verified by microscopic observation and an available hydrodynamic correlation. The developed EIS method represents an original approach to the estimation of wall film thickness applicable to the efficient control of various droplet-based microfluidic devices such as microreactors and microextractors working with aqueous two-phase systems.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Result continuities

  • Project

    <a href="/en/project/LO1402" target="_blank" >LO1402: CENTEM+</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2018

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    MICROELECTRONIC ENGINEERING

  • ISSN

    0167-9317

  • e-ISSN

  • Volume of the periodical

    194

  • Issue of the periodical within the volume

    JUL 5 2018

  • Country of publishing house

    NL - THE KINGDOM OF THE NETHERLANDS

  • Number of pages

    7

  • Pages from-to

    89-95

  • UT code for WoS article

    000433265900016

  • EID of the result in the Scopus database

    2-s2.0-85044131761