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Browsing by Author "Ensinger, Wolfgang"

Now showing items 1-20 of 28

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, ...
Charging a Capacitor from an External Fluctuating Potential using a Single Conical Nanopore

Gómez Lozano, Vicente; Ramirez Hoyos, Patricio; Cervera Montesinos, Javier; Nasir, Saima; Ali, Mubarak; Ensinger, Wolfgang; Mafé, Salvador (Nature Publishing Group: Open Access Journals - Option C, 2015-04-01)

We explore the electrical rectification of large amplitude fluctuating signals by an asymmetric nanostructure operating in aqueous solution. We show experimentally and theoretically that a load capacitor can be charged ...
Concatenated logic functions using nanofluidic diodes with all-electrical inputs and outputs

Gómez Lozano, Vicente; Ramirez Hoyos, Patricio; Cervera, Javier; Ali, Mubarak; Nasir, Saima; Ensinger, Wolfgang; Mafé, Salvador (Elsevier, 2018)

[EN] Nanopore-based logical schemes in ionic solutions typically involve single gates and chemical inputs. The design of computer-like functions requires the consecutive concatenation of several gates and the use of ...
Converting external potential fluctuations into nonzero time-average electric currents using a single nanopore

Gómez Lozano, Vicente; Ramirez Hoyos, Patricio; Cervera Montesinos, Javier; Nasir, Saima; Ali, Mubarak; Ensinger, Wolfgang; Mafé, Salvador (American Institute of Physics (AIP), 2015-02-16)

The possibility of taking advantage of a fluctuating environment for energy and information transduction is a significant challenge in biological and artificial nanostructures. We demonstrate here directional electrical ...
Current rectification by nanoparticle blocking in single cylindrical nanopores

Ali, Mubarak; Ramirez Hoyos, Patricio; Nasir, Saima; Nguyen, Quoc-Hung; Ensinger, Wolfgang; Mafé, Salvador (Royal Society of Chemistry, 2014-07-09)

Blocking of a charged pore by an oppositely charged nanoparticle can support rectifying properties in a cylindrical nanopore, as opposed to the usual case of a fixed asymmetry in the pore geometry and charge distribution. ...
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 ...
Fluoride-induced modulation of ionic transport in asymmetric nanopores functionalized with "caged" fluorescein moieties

Ali, Mubarak; Ahmed, Ishtiaq; Ramirez Hoyos, Patricio; Nasir, Saima; Cervera, Javier; Niemeyer, Christof M.; Ensinger, Wolfgang (The Royal Society of Chemistry, 2016)

[EN] We demonstrate experimentally and theoretically a nanofluidic fluoride sensing device based on a single conical pore functionalized with "caged" fluorescein moieties. The nanopore functionalization is based on an ...
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 ...
Lithium Ion Recognition with Nanofluidic Diodes through Host-Guest Complexation in Confined Geometries

Ali, Mubarak; Ahmed, Ishtiaq; Ramirez Hoyos, Patricio; Nasir, Saima; Mafé, Salvador; Niemeyer, Christof; Ensinger, Wolfgang (American Chemical Society, 2018)

[EN] The lithium ion recognition is receiving significant attention because of its application in pharmaceuticals, lubricants and, especially, in energy technology. We present a nanofluidic device for specific lithium ion ...
Logic Functions with Stimuli-Responsive Single Nanopores

Ramirez Hoyos, Patricio; Cervera Montesinos, Javier; Ali, Mubarak; Ensinger, Wolfgang; Mafé, Salvador (John Wiley & Sons, 2014)

[EN] We present the concept of logic functions based on a single stimuli-responsive nanopore and analyze its potential for electrochemical transducers and actuators. The responsive molecules at the surface of the polymeric ...
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 ...