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 ...
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 ...
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 ...
[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 ...
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 ...
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. ...
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 ...
[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 ...
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 ...
[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 ...
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. ...
[EN] The surface charge regulation in nanoscale volumes is a subject of wide interest to biological and chemical soft matter systems. Also, electrolyte mixtures with monovalent and divalent ions are commonplace in practical ...