[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 ...
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 ...
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 ...
[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, ...
[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 ...
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 ...
[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] 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 ...
[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 ...
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 ...
Haider, Muhammad H. Ali; Nasir, Saima; Ali, Mubarak; Ramirez Hoyos, Patricio; Cervera, Javier; Mafe, Salvador; Ensinger, Wolfgang(Elsevier, 2022-01)
[EN] We present the study of osmotic energy harvesting with soft-etched nanoporous polyimide membranes for a wide range of salt concentration differences, ion irradiation fluences, and multipore orientations (parallel or ...
We present an experimental and theoretical characterization of single cigar-shaped nanopores with pH-responsive carboxylic acid and lysine chains functionalized on the pore surface. The nanopore characterization includes ...