Search results for "Nanoporous membrane"

showing 2 items of 2 documents

Ion size effects on the electrokinetic flow in nanoporous membranes caused by concentration gradients

2003

The space charge model (SCM) relies on the Poisson−Boltzmann (PB) equation, and hence on the assumption of negligible ion size effects, to calculate the radial distribution of the electrical potent...

Electrokinetic phenomenaChemistryFlow (psychology)Materials ChemistryAnalytical chemistryRadial distributionNanoporous membranePhysical and Theoretical ChemistryConcentration gradientSpace chargeSurfaces Coatings and FilmsIon
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Pore structure and function of synthetic nanopores with fixed charges: tip shape and rectification properties

2011

We present a complete theoretical study of the relationship between the structure (tip shape and dimensions) and function (selectivity and rectification) of asymmetric nanopores on the basis of previous experimental studies. The theoretical model uses a continuum approach based on the Nernst-Planck equations. According to our results, the nanopore transport properties, such as current-voltage (I-V) characteristics, conductance, rectification ratio, and selectivity, are dictated mainly by the shape of the pore tip (we have distinguished bullet-like, conical, trumpet-like, and hybrid shapes) and the concentration of pore surface charges. As a consequence, the nanopore performance in practical…

Quantitative Biology::BiomoleculesPhysics::Biological PhysicsNanostructureMaterials scienceMechanical EngineeringConductanceBioengineeringNanotechnologyGeneral ChemistryConical surfaceStructure and functionQuantitative Biology::Subcellular ProcessesNanoporeRectificationMechanics of MaterialsChemical physicsGeneral Materials ScienceSurface chargeNanoporous membraneElectrical and Electronic EngineeringNanotechnology
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