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Nanofluidic lab-on-a-chip trapping devices for screening electrostatics in concentration gradients

Gerspach, Michael Adrian and Mojarad, Nassir and Sharma, Deepika and Pfohl, Thomas and Ekinci, Yasin. (2017) Nanofluidic lab-on-a-chip trapping devices for screening electrostatics in concentration gradients. Microelectronic Engineering, 175. pp. 17-22.

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Official URL: http://edoc.unibas.ch/56114/

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Abstract

Geometry-induced electrostatic (GIE) trapping is a novel contact-free method of stably confining charged nano objects in solution. This method has proven to be very effective in trapping sub-100 nm objects and.is based only on the electrostatic repulsion between the charged object and the device surfaces, without requiring an external control or power. We report on fabricating a GIE trapping device integrated into a microfluidic system and demonstrate its performance in screening the behaviour of individually trapped nano-objects along a NaCI salt concentration gradient. We use 60 nm gold particles as probes to analyze the trapping stiffness and residence time of the particles along the salt gradient. We show that in our devices a critical concentration for the reliable trapping of the particles in the order of seconds is reached at an ionic concentration of 0.3 mM. By analyzing the trap stiffness and residence times, we determine a smooth gradient of the salt concentration, as expected from Fick's first law. Furthermore, we find that the instability of the colloidal dispersion is reached at 0.8 mM NaCl. (C) 2016 Elsevier B.V. All rights reserved.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Biophysikalische Chemie (Pfohl)
UniBasel Contributors:Pfohl, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier
ISSN:0167-9317
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:18 Sep 2017 08:56
Deposited On:18 Sep 2017 08:56

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