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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F18%3A43915898" target="_blank" >RIV/60461373:22340/18:43915898 - isvavai.cz</a>

Alternative codes found

RIV/49777513:23640/18:43964124

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0167931718301138?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0167931718301138?via%3Dihub</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>

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

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20402 - Chemical process engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2018

Confidentiality

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

Name of the periodical

Microelectronic Engineering

ISSN

0167-9317

e-ISSN

—

Volume of the periodical

194

Issue of the periodical within the volume

July

Country of publishing house

US - UNITED STATES

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