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Browsing by Author "Ramirez Hoyos, Patricio"

Now showing items 1-20 of 32

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 ...
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 ...
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 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 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 ...
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 ...
Energy transduction and signal averaging of fluctuating electric fields by a single protein ion channel

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 ...
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 ...