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Browsing by Author "Mafe, Salvador"

Now showing items 1-16 of 16

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 ...
Calcium binding and and ionic conduction in single conical nanopores with polyacid chains: model and experiments

Ali, Mubarak; Nasir, Saima; Ramirez Hoyos, Patricio; Cervera, Javier; Mafe, Salvador; Ensinger, Wolfgang (American Chemical Society, 2012)

Calcium binding to fixed charge groups confined over nanoscale regions is relevant to ion equilibrium and transport in the ionic channels of the cell membranes and artificial nanopores. We present an experimental and ...
Carbohydrate-Mediated Biomolecular Recognition and Gating of Synthetic Ion Channels

Ali, Mubarak; Nasir, Saima; Ramirez Hoyos, Patricio; Cervera Montesinos, Javier; Mafe, Salvador; Ensinger, Wolfgang (American Chemical Society, 2013-09-05)

Nanochannel-based biosensing devices have been proposed for selective detection of protein analyte molecules. However, the design and miniaturization of reusable channel-based biosensors is still a challenge in nanoscience ...
Cesium-Induced Ionic Conduction through a Single Nanofluidic Pore Modified with Calixcrown Moieties

Ali, Mubarak; Ahmed, Ishtiaq; Ramirez Hoyos, Patricio; Nasir, Saima; Cervera, Javier; Mafe, Salvador; Niemeyer, Christof M.; Ensinger, Wolfgang (American Chemical Society, 2017)

[EN] We demonstrate experimentally and theoretically a nanofluidic device for the selective recognition of the cesium ion by exploiting host¿guest interactions inside confined geometry. For this purpose, a host molecule, ...
Electrical network of nanofluidic diodes in electrolyte solutions: Connectivity and coupling to electronic elements

Gómez Lozano, Vicente; Cervera, Javier; Nasir, Saima; Ali, Mubarak; Ensinger, Wolfgang; Mafe, Salvador; Ramirez Hoyos, Patricio (Elsevier, 2016-01)

[EN] We consider a nanopore network with simple connectivity, demonstrating a two-dimensional circuit (full-wave rectifier) with ensembles of conical pores acting as nanofluidic diodes. When the bridge nanopore network is ...
Energy conversion from external fluctuating signals based on asymmetric nanopores

Ramirez Hoyos, Patricio; Gómez Lozano, Vicente; Cervera, Javier; Nasir, Saima; Ali, Mubarak; Ensinger, Wolfgang; Mafe, Salvador (Elsevier, 2015-09)

Electrical transduction from fluctuating external signals is central to energy conversion based on nanoscale electrochemical devices and bioelectronics interfaces. We demonstrate theoretically and experimentally a ...
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 ...
Hybrid Circuits with Nanofluidic Diodes and Load Capacitors

Ramirez Hoyos, Patricio; García-Morales, V.; Gómez Lozano, Vicente; Ali, Mubarak; Nasir, Saima; Ensinger, Wolfgang; Mafe, Salvador (American Physical Society, 2017)

[EN] The chemical and physical input signals characteristic of micro- and nanofluidic devices operating in ionic solutions should eventually be translated into output electric currents and potentials that are monitored ...
Information processing with a single multifunctional nanofluidic diode

Ramirez Hoyos, Patricio; Ali, Mubarak; Ensinger, Wolfgang; Mafe, Salvador (American Institute of Physics, 2012)

[EN] We show that a multifunctional nanofluidic diode, based on a single pH-sensitive polymeric pore, can be used for different information processing tasks. This fact should permit a significant simplification of the logic ...
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 ...
Label-free histamine detection with nanofluidic diodes through metal ion displacement mechanism

Ali, Mubarak; Ramirez Hoyos, Patricio; Duznovic, Ivana; Nasir, Saima; Mafe, Salvador; Ensinger, Wolfgang (Elsevier, 2017)

[EN] We design and characterize a nanofluidic device for the label-free specific detection of histamine neurotransmitter based on a metal ion displacement mechanism. The sensor consists of an asymmetric polymer nanopore ...
Label-Free Pyrophosphate Recognition with Functionalized Asymmetric Nanopores

Ali, Mubarak; Ahmed, Ishtiaq; Ramirez Hoyos, Patricio; Nasir, Saima; Niemeyer, Christof M.; Mafe, Salvador; Ensinger, Wolfgang (John Wiley & Sons, 2016)

[EN] The label¿free detection of pyrophosphate (PPi) anions with a nanofluidic sensing device based on asymmetric nanopores is demonstrated. The pore surface is functionalized with zinc complexes based on two di(2¿picolyl)amine ...
Multipore membranes with nanofluidic diodes allowing multifunctional rectification and logical responses

Cervera, Javier; Ramirez Hoyos, Patricio; Gómez Lozano, Vicente; Nasir, Saima; Ali, Mubarak; Ensinger, Wolfgang; Stroeve, Pieter; Mafe, Salvador (American Institute of Physics, 2016)

[EN] We have arranged two multipore membranes with conical nanopores in a three-compartment electrochemical cell. The membranes act as tunable nanofluidic diodes whose functionality is entirely based on the pH-reversed ...
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 ...
Single cigar-shaped nanopores functionalized with amphoteric amino acid chains: experimental and theoretical characterization

Ali, Mubarak; Ramirez Hoyos, Patricio; Nguyen, Hung Quoc; Nasir, Saima; Cervera, Javier; Mafe, Salvador; Ensinger, Wolfgang (American Chemical Society, 2012)

We present an experimental and theoretical characterization of single cigar-shaped nanopores with pH-responsive carboxylic acid and lysine chains functionalized on the pore surface. The nanopore characterization includes ...
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 ...