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Listar por palabra clave "Current rectification"

Mostrando ítems 1-6 de 6

A redox-sensitive nanofluidic diode based on nicotinamide-modified asymmetric nanopores

Ali, Mubarak; Ahmed, Ishtiaq; Ramirez Hoyos, Patricio; Nasir, Saima; Mafe, Salvador; Niemeyer, Christof M.; Ensinger, Wolfgang (Elsevier, 2017-03)

[EN] We demonstrate a redox-sensitive nanofluidic diode whose ion rectification is modulated by the oxidation and reduction of chemical moieties incorporated on its surface. To achieve this goal, we have first synthesized ...
Fabrication of Single Cylindrical Au-Coated Nanopores with Non-Homogeneous Fixed Charge Distribution Exhibiting High Current Rectifications

Nasir, Saima; Ali, Mubarak; Ramirez Hoyos, Patricio; Gómez Lozano, Vicente; Oschmann, Bernd; Muench, Falk; Tahir, Muhammad Nawaz; Zentel, Rudolf; Mafe, Salvador; Ensinger, Wolfgang (American Chemical Society, 2014-08)

We have designed and characterized a cylindrical nanopore that exhibits high electrochemical current rectification ratios at low and intermediate electrolyte concentrations. For this purpose, the track-etched single ...
Ionic transport through chemically functionalized hydrogen peroxide-sensitive asymmetric nanopores

Ali, Mubarak; Ahmed, Ishtiaq; Nasir, Saima; Ramirez Hoyos, Patricio; Niemeyer, Christof M; Mafe, Salvador; Ensinger, Wolfgang (American Chemical Society, 2015-09)

We describe the fabrication of a chemical-sensitive nanofluidic device based on asymmetric nanopores whose transport characteristics can be modulated upon exposure to hydrogen peroxide (H2O2). We show experimentally and ...
Nanopore charge inversion and current-voltage curves in mixtures of asymmetric electrolytes

Ramirez Hoyos, Patricio; Manzanares, José Antonio; Cervera Montesinos, Javier; Gómez Lozano, Vicente; Ali, Mubarak; Pause, Isabelle; Ensinger, Wolfgang; Mafé, Salvador (Elsevier, 2018)

[EN] We consider the screening of the negative charges (carboxylic acid groups) fixed on the surface of a conical-shaped track-etched nanopore by divalent magnesium (Mg2+) and trivalent lanthanum (La3+). The experimental ...
Optical gating of photosensitive synthetic ion channels

Ali, Mubarak; Nasir, Saima; Ramirez Hoyos, Patricio; Ahmed, Ishtiaq; Nguyen, Quoc Hung; Fruk, Ljiljana; Mafe, Salvador; Ensinger, Wolfgang (Wiley-VCH Verlag, 2012)

4-oxo-4-(pyren-4-ylmethoxy) butanoic acid is used as a photolabile protecting group to show the optical gating of nanofluidic devices based on synthetic ion channels. The inner surface of the channels is decorated with ...
Tetraalkylammonium Cations Conduction through a Single Nanofluidic Diode: Experimental and Theoretical Studies

Ali, Mubarak; Ramirez Hoyos, Patricio; Nasir, Saima; Cervera Montesinos, Javier; Mafe, Salvador; Ensinger, Wolfgang (2017)

[EN] We describe experimentally and theoretically the concentration-dependent conduction of tetraalkylammonium (TAA+) cations through a nanofluidic diode fabricated in a polymer membrane via asymmetric track-etching ...