[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, ...
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. ...
[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 ...
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 ...
Ali, Mubarak; Ahmed, Ishtiaq; Ramirez Hoyos, Patricio; Nasir, Saima; Cervera, Javier; Niemeyer, Christof M.; Ensinger, Wolfgang(The Royal Society of Chemistry, 2016)
[EN] We demonstrate experimentally and theoretically a nanofluidic fluoride sensing device based on a single conical pore functionalized with "caged" fluorescein moieties. The nanopore functionalization is based on an ...
[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 ...