Nanofluidic diode generated by pH gradient inside track-etched conical nanopore

Wang, L.; Guo, Wei; Xie, Yanbo; Wang, X.W.; Xue, Jianming; Wang, Y.G.

doi:10.1016/j.radmeas.2009.10.042

Cited by 41 publications

(16 citation statements)

References 15 publications

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“…The first point to make about Table 2 is that total overlap ( Figure 7 a) would not be achieved for any of these pores because all of the radii are greater than the double layer thickness, 3 nm. Nevertheless, pores with tip radii of 10 nm or less have far greater moles of double layer cations in the tip than moles of bulk ions, and, in agreement with experimental data [ 17 , 47 , 75 ], such pores rectify. Returning to the discussion concerning the importance of the cation transference number in the tip on rectification, t + of ~0.9 and above are obtained for the smallest tips ( Table 2 ).…”

Section: Ion Current Rectification In Asymmetric Poressupporting

confidence: 83%

From Ion Current to Electroosmotic Flow Rectification in Asymmetric Nanopore Membranes

Experton

Martin

2017

Nanomaterials

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Asymmetrically shaped nanopores have been shown to rectify the ionic current flowing through pores in a fashion similar to a p-n junction in a solid-state diode. Such asymmetric nanopores include conical pores in polymeric membranes and pyramidal pores in mica membranes. We review here both theoretical and experimental aspects of this ion current rectification phenomenon. A simple intuitive model for rectification, stemming from previously published more quantitative models, is discussed. We also review experimental results on controlling the extent and sign of rectification. It was shown that ion current rectification produces a related rectification of electroosmotic flow (EOF) through asymmetric pore membranes. We review results that show how to measure and modulate this EOF rectification phenomenon. Finally, EOF rectification led to the development of an electroosmotic pump that works under alternating current (AC), as opposed to the currently available direct current EOF pumps. Experimental results on AC EOF rectification are reviewed, and advantages of using AC to drive EOF are discussed.

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Section: Ion Current Rectification In Asymmetric Poressupporting

confidence: 83%

From Ion Current to Electroosmotic Flow Rectification in Asymmetric Nanopore Membranes

Experton

Martin

2017

Nanomaterials

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“…The charge of the nanopore can be manipulated with chemical methods by anchoring functional groups to the pore wall [28,29,30,31,32,33,34,16]. Surface charge can also be modulated with pH if protonation/deprotonation of the functional groups is pH sensitive [35,36,37]. Sensors can be designed if molecules attached to the pore wall can bind other molecules selectively so that binding these molecules modulates the current of the background elecrolyte through the pore in a characteristic and identifiable way [38,39,40,41,42,43,44,45,46,47].…”

Section: Introductionmentioning

confidence: 99%

Controlling ion transport through nanopores: modeling transistor behavior

Mádai

Matejczyk

Dallos

et al. 2018

Phys. Chem. Chem. Phys.

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We present a modeling study of a nanopore-based transistor computed by a mean-field continuum theory (Poisson-Nernst-Planck, PNP) and a hybrid method including particle simulation (Local Equilibrium Monte Carlo, LEMC) that is able to take ionic correlations into account including the finite size of ions. The model is composed of three regions along the pore axis with the left and right regions determining the ionic species that is the main charge carrier, and the central region tuning the concentration of that species and, thus, the current flowing through the nanopore. We consider a model of small dimensions with the pore radius comparable to the Debye-screening length (R/λ≈ 1), which, together with large surface charges provides a mechanism for creating depletion zones and, thus, controlling ionic current through the device. We report the scaling behavior of the device as a function of the R/λ parameter. Qualitative agreement between PNP and LEMC results indicates that mean-field electrostatic effects predominantly determine device behavior.

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“…This behavior shows the preferential direction for ion flow in synthetic nanochannels, which is observed as a nonlinear current-voltage signal [19]. Nanofluidic diode system was fabricated using single conically shaped nanopore by manipulating pH gradient and an enhanced current rectification was obtained comparing with the condition that there exists homogeneous electrolyte [20]. The concentration gradient dependent ionic current rectifications were reported in charged nanopores [21,22] and homogeneous silica nanochannels [23,24] as well.…”

Section: Introductionmentioning

confidence: 87%

Alumina Membrane with Hour‐Glass Shaped Nanochannels: Tunable Ionic Current Rectification Device Modulated by Ions Gradient

Hou

Wang

Fan

et al. 2014

Journal of Nanomaterials

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A new alumina membrane with hour-glass shaped nanochannels is reported using the double-side anodization method and the subsequently in situ pore opening procedure, which is applied to develop the tunable ionic current rectification devices that were modulated by ions gradient. By regulating the pH gradient, tunable ionic current rectification properties which are mainly dependent on the asymmetric surface charge density or polarity distribution on the inner walls of the nanochannels can be obtained. The enhanced ionic current rectification properties were presented due to the synergistic effect of the voltage driven ion flow and diffusion driven ion flow with the application of pH and electrolyte concentration gradients. Therefore, such specific alumina nanochannels would be considered as a promising candidate for building bioinspired artificial ion channel systems.

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Nanofluidic diode generated by pH gradient inside track-etched conical nanopore

Cited by 41 publications

References 15 publications

From Ion Current to Electroosmotic Flow Rectification in Asymmetric Nanopore Membranes

From Ion Current to Electroosmotic Flow Rectification in Asymmetric Nanopore Membranes

Controlling ion transport through nanopores: modeling transistor behavior

Alumina Membrane with Hour‐Glass Shaped Nanochannels: Tunable Ionic Current Rectification Device Modulated by Ions Gradient

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