Nanopipet-Based Resistive Pulse Sensing to Follow Alterations in the Size and Concentration of Nanoparticles During Membrane Filtration

We propose a calibration‐free resistive pulse sensing (RPS) methodology based on nanopipets to follow the size and concentration changes of nanoparticles during size‐selective separation processes. The study was performed with monodisperse latex nanoparticles and their mixtures that were subjected t...

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Bibliographic Details
Published in:Electroanalysis (New York, N.Y.) N.Y.), 2015-03, Vol.27 (3), p.595-601
Main Authors: Terejánszky, Péter, Makra, István, Lukács, Alda, Gyurcsányi, Róbert E.
Format: Article
Language:English
Subjects:
Centrifugal filtration
Detection
Filtration
Membrane filtration
Membranes
Nanoparticles
Nanostructure
Porosity
Recovery
Resistive pulse sensing
Separation
Track-etch membranes
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Summary:We propose a calibration‐free resistive pulse sensing (RPS) methodology based on nanopipets to follow the size and concentration changes of nanoparticles during size‐selective separation processes. The study was performed with monodisperse latex nanoparticles and their mixtures that were subjected to separation procedures such as filtration through track‐etch membranes of various pore diameters as well as centrifugal filtration. The RPS measurements were found to be suitable to determine both the recovery of the nanoparticles after filtration as well as subtle changes in their size distribution. Filtration through track‐etch membranes preserved the mean size of the nanoparticles while their recovery was affected by the size of the pore and coexistence of larger nanoparticle fractions in the sample. Centrifugal filtration resulted in the appearance of aggregates.
ISSN:1040-0397
1521-4109
DOI:10.1002/elan.201400651