Verdia-Baguena, Carmina; Gómez Lozano, Vicente; Cervera, J.; Ramirez Hoyos, Patricio; Mafe, S.(The Royal Society of Chemistry, 2017)
[EN] We demonstrate the electrical rectification and signal averaging of fluctuating signals using a biological nanostructure in aqueous solution: a single protein ion channel inserted in the lipid bilayer characteristic ...
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 ...
[EN] Ionic selectivity in nanopores is usually based either on steric or charge exclusion mechanisms. By simultaneously incorporating both mechanisms into a functionalized membrane, an improved control over selectivity can ...
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 ...
[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 ...
[EN] The membrane potential (V-mem), defined as the electric potential difference across a membrane flanked by two different salt solutions, is central to electrochemical energy harvesting and conversion. Also, V-mem and ...
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 ...
[EN] We experimentally characterize the ionic conduction of single and multipore nanoporous membranes in aprotic organic electrolytes. To this end, soft-etched (SE) membranes with pore diameters in the nanometer range and ...
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 ...
[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 ...
[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 ...
[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 ...
[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 ...
[EN] Liquid state arrangements of two polymeric membranes with single conical nanopores constitute nanofluidic diodes that allow a rich electrical functionality based on the modulation of individual conductances in aqueous ...
[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 ...
Ali, Mubarak; Ramirez Hoyos, Patricio; Nasir, Saima; Nguyen, Quoc-Hung; Ensinger, Wolfgang; Mafé, Salvador(American Institute of Physics (AIP), 2014-01-27)
Rectification in nanopores is usually achieved by a fixed asymmetry in the pore geometry and charge distribution. We show here that nanoparticle blocking of a cylindrical pore induces rectifying properties that can support ...
[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 ...
Ramirez Hoyos, Patricio; Perez-Grau, Jose J.; Cervera, Javier; Nasir, Saima; Ali, Mubarak; Ensinger, Wolfgang; Mafé, Salvador(American Institute of Physics, 2021-05-05)
[EN] Negative differential resistance (NDR) phenomena are under-explored in nanostructures operating in the liquid state. We characterize experimentally the NDR and threshold switching phenomena observed when conical ...
Nasir, Saima; Ramirez Hoyos, Patricio; Ali, Mubarak; Ahmed, Ishtiaq; Fruk, Ljiliana; Mafé, Salvador; Ensinger, Wolfgang(American Institute of Physics (AIP), 2013-01-21)
We describe the fabrication of asymmetric nanopores sensitive to ultraviolet (UV) light, and give
a detailed account of the divalent ionic transport through these pores using a theoretical model
based on the Nernst-Planck ...
We have studied experimentally and theoretically the rectifying properties of a single asymmetric nanopore functionalized with amphoteric lysine groups and characterized the net current obtained with zero-average time ...