Ion-Current Rectification in Nanopores and Nanotubes with Broken Symmetry

Siwy, Zuzanna S.

doi:10.1002/adfm.200500471

Cited by 778 publications

(917 citation statements)

References 53 publications

Supporting

Mentioning

877

Contrasting

Unclassified

Order By: Relevance

“…The preferential direction of cation flow is from the narrow tip towards the wide opening. 18,19 After modification, the anchoring of the BEC-NH 2 neutral chains having uncharged terminal boronic ester decreased the pore surface charge density, in agreement with the significant decrease observed in the pore rectification ratio, from 5.7 to 1.7. a corresponding phenol. 20 The resulting phenolic compound further undergoes decarboxylation and 1,6-elimination reactions, leading to the generation of amine groups.…”

supporting

confidence: 72%

Ionic Transport through Chemically Functionalized Hydrogen Peroxide-Sensitive Asymmetric Nanopores

Ali

Ahmed

Nasir

et al. 2015

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

American Chemical SocietyAli, M.; Ahmed, I.; Nasir, S.; Ramirez Hoyos, P.; Niemeyer, CM.; Mafe, S.; Ensinger, W. (2015). Ionic transport through chemically functionalized hydrogen peroxide-sensitive asymmetric nanopores. ACS Applied Materials and Interfaces. 7(35):19541-19545 ABSTRACTWe describe the fabrication of a chemical-sensitive nanofluidic device based on asymmetric nanopores whose transport characteristics can be modulated upon exposure to hydrogen peroxide (H 2 O 2 ). We show experimentally and theoretically that the current-voltage curves provide a suitable method to monitor the change of pore surface characteristics induced by H 2 O 2 in solution from the electronic readouts. We demonstrate also that the single pore characteristics can be scaled to the case of a multipore membrane whose electric outputs can be readily controlled.Because H 2 O 2 is an agent significant for medical diagnostics, the results should be useful for sensing nanofluidic devices.

show abstract

supporting

confidence: 72%

Ionic Transport through Chemically Functionalized Hydrogen Peroxide-Sensitive Asymmetric Nanopores

Ali

Ahmed

Nasir

et al. 2015

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Nanopores also exhibit other unusual properties, some of which could be potentially exploited to build novel microfluidic devices. For example, conical nanopores fabricated on plastic films using the ion track-etching technique (Siwy 2006) have been shown to exhibit ion current rectification similar to that of semiconductor diodes (Siwy & Fulinsski 2004;Vlassiouk & Siwy 2007;Vlassiouk et al 2008a,b). A similar effect has been reported recently for electroosmotic flow out of nanocapillaries (Laohakunakorn et al 2013b).…”

Section: Introductionmentioning

confidence: 99%

Electro-osmotic flow through a nanopore

2014

View full text Add to dashboard Cite

Electroosmotic pumping of fluid through a nanopore that traverses an insulating membrane is considered. The density of surface charge on the membrane is assumed uniform, and sufficiently low for the Poisson-Boltzmann equation to be linearized. The reciprocal theorem gives the flow rate generated by an applied weak electric field, expressed as an integral over the fluid volume. For a circular hole in a membrane of zero thickness, an analytical result is possible up to quadrature. For a membrane of arbitrary thickness, the full Poisson-Nernst-Planck-Stokes system of equations is solved numerically using a finite volume method. The numerical solution agrees with the standard analytical result for electro-osmotic flux through a long cylindrical pore when the membrane thickness is large compared to the hole diameter. When the membrane thickness is small, the flow rate agrees with that calculated using the reciprocal theorem.

show abstract

“…Ion and electron beams are often used to create single or multiple nanochannels in ultrathin free standing silicon, [19] silicon nitride, [20] silicon oxide, [21] and graphene membranes. [22] Furthermore, other methods such as electrochemical etching, [23] anodic oxida tion, [24] and laser technology [25] have been adopted depending on the type of materials and application requirements. The ion track etching technology, which can accurately control the diameter and shape of the nano channels, is a fascinating method to prepare polymeric nanochannels.…”

Section: Introductionmentioning

confidence: 99%

Smart Bioinspired Nanochannels and their Applications in Energy‐Conversion Systems

Fan

Liu

et al. 2017

Advanced Materials

View full text Add to dashboard Cite

materials. For example, nanochannels fab ricated in elastic materials can respond to an applied pressure, [4] and conical nanochannels in poly(ethylene tereph thalate) (PET) membranes can respond to pH. [5] Thus, it is convenient to achieve simple responsive properties by directly using responsive materials to construct the nano channels. The second route is an indirect method, where functional molecules and materials are modified onto the inner surfaces of nanochannels. This method can change the physical and chemical properties of nanochannels to make the system more intelligent. [6] Smart bioinspired nano channels with different shapes and compositions have been fabri cated, and these nanochannels can respond to various stimuli, such as pH, [7] light, [8] temperature, [9] specific ions, [10] and mole cules. [11] Compared with their fragile biological counterparts, smart bioinspired nanochannels possess excellent mechanical robustness, controllable geometry, tunable surface properties, and good chemical stability. [12] These advantages make them useful for many potential applications, ranging from molecular filters to biosensors to energy conversion devices. [13] Smart bioinspired nanochannels not only provide a basic research platform to simulate the ion transport process in living bodies, but also boost the generation of energy conver sion devices. In nature, ion channels can be used as switches to regulate mass transport and energy conversion. Learning from nature, numerous energy conversion systems based on artificial ion channels have been devised, [14] which are of great significance for the development of sustainable energy. Here, we summarize recent advances in the fabrication of smart bioinspired nanochannels and highlight their applications in energy conversion systems. Recent Advances in the Fabrication of Smart Bioinspired Nanochannels Materials and TechniquesThe fragility and instability of biological ion channels have motivated the development of smart bioinspired nanochan nels. To satisfy specific application requirements, various materials such as biological, [15] inorganic, [16] organic, [17] and composite materials [18] have been used to fabricate artificial nanochannels. Currently, nanochannels with diverse shapes and structures can be obtained using different techniques and Smart bioinspired nanochannels exhibiting ion-transport properties similar to biological ion channels have attracted extensive attention. Like ion channels in nature, smart bioinspired nanochannels can respond to various stimuli, which lays a solid foundation for mass transport and energy conversion. Fundamental research into smart bioinspired nanochannels not only furthers understanding of life processes in living bodies, but also inspires researchers to construct smart nanodevices to meet the increasing demand for the use of renewable resources. Here, a brief summary of recent research progress regarding the design and preparation of smart bioinspired nanochannels is presented. Moreover, representative applications ...

show abstract

Ion-Current Rectification in Nanopores and Nanotubes with Broken Symmetry

Cited by 778 publications

References 53 publications

Ionic Transport through Chemically Functionalized Hydrogen Peroxide-Sensitive Asymmetric Nanopores

Ionic Transport through Chemically Functionalized Hydrogen Peroxide-Sensitive Asymmetric Nanopores

Electro-osmotic flow through a nanopore

Smart Bioinspired Nanochannels and their Applications in Energy‐Conversion Systems

Contact Info

Product

Resources

About