[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 ...
[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 ...
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 ...
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 ...
[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, ...
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 ...
[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 ...
[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 ...
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 ...
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 ...
[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] 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 ...
4-oxo-4-(pyren-4-ylmethoxy) butanoic acid is used as a photolabile protecting group to show the optical gating of nanofluidic devices based on synthetic ion channels. The inner surface of the channels is decorated with ...