Autoren:	Niu, Ran Khodorov, Stanislav Weber, Julian Reinmüller, Alexander Palberg, Thomas
Titel:	Large scale micro-photometry for high resolution pH-characterization during electro-osmotic pumping and modular micro-swimming
Online-Publikationsdatum:	15-Jul-2022
Erscheinungsdatum:	2017
Sprache des Dokuments:	Englisch
Zusammenfassung/Abstract:	Micro-fluidic pumps as well as artificial micro-swimmers are conveniently realized exploiting phoretic solvent flows based on local gradients of temperature, electrolyte concentration or pH. We here present a facile micro-photometric method for monitoring pH gradients and demonstrate its performance and scope on different experimental situations including an electro-osmotic pump and modular micro-swimmers assembled from ion exchange resin beads and polystyrene colloids. In combination with the present microscope and DSLR camera our method offers a 2 μ m spatial resolution at video frame rate over a field of view of 3920 × 2602 μ m 2 . Under optimal conditions we achieve a pH-resolution of 0.05 with about equal contributions from statistical and systematical uncertainties. Our quantitative micro-photometric characterization of pH gradients which develop in time and reach out several mm is anticipated to provide valuable input for reliable modeling and simulations of a large variety of complex flow situations involving pH-gradients including artificial micro-swimmers, microfluidic pumping or even electro-convection.
DDC-Sachgruppe:	530 Physik 530 Physics
Veröffentlichende Institution:	Johannes Gutenberg-Universität Mainz
Organisationseinheit:	FB 08 Physik, Mathematik u. Informatik
Veröffentlichungsort:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-7437
Version:	Published version
Publikationstyp:	Zeitschriftenaufsatz
Nutzungsrechte:	CC BY
Informationen zu den Nutzungsrechten:	https://creativecommons.org/licenses/by/3.0/
Zeitschrift:	New journal of physics 19 11
Seitenzahl oder Artikelnummer:	Art. 115014
Verlag:	IOP
Verlagsort:	London
Erscheinungsdatum:	2017
ISSN:	1367-2630
URL der Originalveröffentlichung:	http://dx.doi.org/10.1088/1367-2630/aa9545
DOI der Originalveröffentlichung:	10.1088/1367-2630/aa9545
Enthalten in den Sammlungen:	DFG-OA-Publizieren (2012 - 2017)