Dieses Dokument steht unter einer CreativeCommons Lizenz by-nc-sa/4.0
Verlagslink: http://arxiv.org/abs/1407.1038v1
Verlagslink DOI: 10.1038/ncomms5237
Titel: Switchable imbibition in nanoporous gold
Sprache: English
Autor/Autorin: Xue, Yahui 
Markmann, Jürgen 
Duan, Huiling 
Weißmüller, Jörg 
Huber, Patrick 
Schlagwörter: fluid dynamics;materials Science;soft condensed matter;chemical physics
Erscheinungsdatum: 1-Jul-2014
Verlag: Nature Publishing Group UK
Quellenangabe: Nature communications 1 (5): 4237- (2014-07-01)
Zeitschrift oder Schriftenreihe: Nature communications 
Zusammenfassung (englisch): Spontaneous imbibition enables the elegant propelling of nano-flows because of the dominance of capillarity at small length scales. The imbibition kinetics are, however, solely determined by the static host geometry, the capillarity, and the fluidity of the imbibed liquid. This makes active control particularly challenging. Here we show for aqueous electrolyte imbibition in nanoporous gold that the fluid flow can be reversibly switched on and off through electric potential control of the solid-liquid interfacial tension, that is, we can accelerate the imbibition front, stop it, and have it proceed at will. Simultaneous measurements of the mass flux and the electrical current allow us to document simple scaling laws for the imbibition kinetics, and to explore the charge transport in the metallic nanopores. Our findings demonstrate that the high electric conductivity along with the pathways for fluid/ionic transport render nanoporous gold a versatile, accurately controllable electrocapillary pump and flow sensor for minute amounts of liquids with exceptionally low operating voltages.
URI: http://tubdok.tub.tuhh.de/handle/11420/1695
DOI: 10.15480/882.1692
ISSN: 2041-1723
Institut: Keramische Hochleistungswerkstoffe M-9 
Werkstoffphysik und -technologie M-22 
Dokumenttyp: (wissenschaftlicher) Artikel
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