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Browsing by Author "Mafé, Salvador"

Now showing items 1-14 of 14

Asymmetric nanopore rectification for ion pumping, electrical power generation, and information processing applications

Cervera, Javier; Ramirez Hoyos, Patricio; Mafé, Salvador; STROEVE, PIETER (Elsevier, 2011-04)

Single-track, asymmetric nanopores can currently be functionalised with a spatially inhomogeneous distribution of fixed charges and a variety of pore tip shapes. Optimising the asymmetric nanopore characteristics is crucial ...
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 pumping of potassium ions against an external concentration gradient in a biological ion channel

Queralt-Martín, María; García Giménez, Elena; Aguilella, Vicente-Manuel; Ramirez Hoyos, Patricio; Mafé, Salvador; Alcaraz González, Antonio (American Institute of Physics (AIP), 2013-07)

We show experimentally and theoretically that significant currents can be obtained with a biological ion channel, the OmpF porin of Escherichia coli, using zero-average potentials as driving forces. The channel rectifying ...
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 ...
Nanoparticle-induced rectification in a single cylindrical nanopore: Net currents from zero time-average potentials

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 ...
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 ...
Nernst-Planck model of photo-triggered, pH-tunable ionic transport through nanopores functionalized with "caged" lysine chains

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 ...
Net currents obtained from zero-average potentials in single amphoteric nanopores

Ramirez Hoyos, Patricio; Gómez Lozano, Vicente; Ali, Mubarak; Ensinger, Wolfgang; Mafé, Salvador (Elsevier, 2013-06)

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 ...
Optimizing Energy Transduction of Fluctuating Signals with Nanofluidic Diodes and Load Capacitors

Ramirez Hoyos, Patricio; Cervera Montesinos, Javier; Gómez Lozano, Vicente; Ali, Mubarak; Nasir, Saima; Ensinger, Wolfgang; Mafé, Salvador (John Wiley & Sons, 2018)

[EN] The design and experimental implementation of hybrid circuits is considered allowing charge transfer and energy conversion between nanofluidic diodes in aqueous ionic solutions and conventional electronic elements ...
Protein diffusion through charged nanopores with different radii at low ionic strength

Stroeve, Pieter; Rahman, Masoud; Naidu, Lekkala Dev; Chu, Gilbert; Mahmoudi, Morteza; Ramirez Hoyos, Patricio; Mafé, Salvador (Royal Society of Chemistry, 2014-10-21)

[EN] The diffusion of two similar molecular weight proteins, bovine serum albumin (BSA) and bovine haemoglobin (BHb), through nanoporous charged membranes with a wide range of pore radii is studied at low ionic strength. ...