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Listar por autor "Ramirez Hoyos, Patricio"

Mostrando ítems 1-20 de 51

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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 ...
Accurate characterization of single track-etched, conical nanopores

Apel, Pavel Yu; Ramirez Hoyos, Patricio; Blonskaya, Irina V.; Orelovitch, Oleg L.; Sartowska, Bozena A. (Royal Society of Chemistry, 2014)

Single track-etched conical nanopores in polymer foils have attracted considerable attention in recent years due to their potential applications in biosensing, nanofluidics, information processing, and other fields. The ...
Additivity of ionic currents in mixed electrolyte solutions and confined geometries

Perez-Grau, Jose J.; Cervera, Javier; Nasir, Saima; Ali, Mubarak; Ensinger, Wolfgang; Ramirez Hoyos, Patricio; Mafe, Salvador (Elsevier, 2022-08-15)

[EN] Electrolyte mixtures in aqueous solutions are central to biophysical chemistry and chemical engineering. In many cases, ions are confined to nanoscale volumes with surface electrical charges. Here, we analyze ...
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 ...
Biomolecular conjugation inside synthetic polymer nanopores via glycoprotein-lectin interactions

Mubarak, Ali; Ramirez Hoyos, Patricio; Tahir, Muhammad Nawaz; Mafé, Salvador; Siwy, Zuzanna S.; Neumann, Reinhard; Tremel, W.; Ensinger, Wolfgang J. (Royal Society of Chemistry, 2011-03-18)

We demonstrate the supramolecular bioconjugation of concanavalin A (Con A) protein with glycoenzyme horseradish peroxidase (HRP) inside single nanopores, fabricated in heavy ion tracked polymer membranes. Firstly, the ...
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 ...
Cation pumping against a concentration gradient in conical nanopores characterized by load capacitors

Cervera, Javier; Ramirez Hoyos, Patricio; Nasir, Saima; Mubarak, Ali; Ensinger, Wolfgang; Siwy, Zuzanna S.; Mafe, Salvador (Elsevier, 2023-08)

[EN] We study the cation transport against an external concentration gradient (cation pumping) that occurs in conical nanopores when zero-average oscillatory and white noise potentials are externally applied. This pumping, ...
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. ...
Designing voltage multipliers with nanofluidic diodes immersed in aqueous salt solutions

Ramirez Hoyos, Patricio; Gómez Lozano, Vicente; Verdia-Baguena, C.; Nasir, Saima; Ali, M.; Ensinger, W.; Mafe, S. (The Royal Society of Chemistry, 2016)

[EN] Membranes with nanofluidic diodes allow the selective control of molecules in physiological salt solutions at ambient temperature. The electrical coupling of the membranes with conventional electronic elements such ...
Effect of cationic polyamidoamine dendrimers on ionic transport through nanochannels

Froehlich, Kristina; Ali, Mubarak; Ramirez Hoyos, Patricio; Cervera Montesinos, Javier; García-Morales, Vladimir; Erdmann, Markus; Ensinger, Wolfgang (Elsevier, 2021-01-20)

[EN] The effect of polyamidoamine (PAMAM) dendrimers (generations G0-G3) on the ion transport properties of nanochannels (conical and cylindrical) is studied either by surface functionalization or by addition to the ...
Effect of nanopore geometry on ion current rectification

Apel, Pavel Yu; Blonskaya, Irina V.; Orelovitch, Oleg L.; Ramirez Hoyos, Patricio; Sartowska, Bozena A. (IOP Publishing: Hybrid Open Access, 2011-03-16)

We present the results of systematic studies of ion current rectification performed on artificial asymmetric nanopores with different geometries and dimensions. The nanopores are fabricated by the ion track etching method ...
Electrical conductance of conical nanopores: Symmetric and asymmetric salts and their mixtures

Ramirez Hoyos, Patricio; Cervera, Javier; Manzanares, José A.; Nasir, Saima; Ali, Mubarak; Ensinger, Wolfgang; Mafe, Salvador (American Institute of Physics, 2022-10-14)

[EN] We have studied experimentally the electrical conductance-voltage curves of negatively and positively charged conical nanopores bathed in ionic solutions with monovalent, divalent, and trivalent cations at electrochemically ...
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 ...
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 ...
Electrochemical impedance spectroscopy of membranes with nanofluidic conical pores

Ramirez Hoyos, Patricio; Cervera, Javier; Nasir, Saima; Mubarak, Ali; Ensinger, Wolfgang; Mafe, Salvador (Elsevier, 2023-11)

[EN] Electrochemical impedance spectroscopy (EIS) constitutes a useful tool in membrane science and technology because it provides valuable structural and functional information. The different arcs observed in the impedance ...