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Electrokinetics in Micro-channeled Cantilevers : Extending the Toolbox for Reversible Colloidal Probes and AFM-Based Nanofluidics

Title data

Mark, Andreas ; Helfricht, Nicolas ; Rauh, Astrid ; Xue, Jinqiao ; Knödler, Patrick ; Schumacher, Thorsten ; Karg, Matthias ; Du, Binyang ; Lippitz, Markus ; Papastavrou, Georg:
Electrokinetics in Micro-channeled Cantilevers : Extending the Toolbox for Reversible Colloidal Probes and AFM-Based Nanofluidics.
In: Scientific Reports. Vol. 9 (December 2019) .
ISSN 2045-2322
DOI: https://doi.org/10.1038/s41598-019-56716-0

Abstract in another language

The combination of atomic force microscopy (AFM) with nanofluidics, also referred to as FluidFM, has facilitated new applications in scanning ion conductance microscopy, direct force measurements, lithography, or controlled nanoparticle deposition. An essential element of this new type of AFMs is its cantilever, which bears an internal micro-channel with a defined aperture at the end. Here, we present a new approach for in-situ characterization of the internal micro-channels, which is non-destructive and based on electrochemical methods. It allows for probing the internal environment of a micro-channeled cantilever and the corresponding aperture, respectively. Acquiring the streaming current in the micro-channel allows to determine not only the state of the aperture over a wide range of ionic strengths but also the surface chemistry of the cantilever’s internal channel. The high practical applicability of this method is demonstrated by detecting the aspiration of polymeric, inorganic and hydrogel particles with diameters ranging from several µm down to 300 nm. By verifying in-situ the state of the aperture, i.e. open versus closed, electrophysiological or nano-deposition experiments will be significantly facilitated. Moreover, our approach is of high significance for direct force measurements by the FluidFM-technique and sub-micron colloidal probes.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics III - Nanooptics > Chair Experimental Physics III - Nanooptics - Univ.-Prof. Dr. Markus Lippitz
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry II > Chair Physical Chemistry II - Univ.-Prof. Dr. Georg Papastavrou
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 05 Feb 2020 12:35
Last Modified: 05 Feb 2020 12:35
URI: https://eref.uni-bayreuth.de/id/eprint/54183