Net currents obtained from zero-average potentials in single amphoteric nanopores

Ramı́rez, Patricio; Gómez, Vicente; Ali, Mubarak; Ensinger, Wolfgang; Mafé, Salvador

doi:10.1016/j.elecom.2013.03.026

Cited by 19 publications

(26 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results confirm that <I> arises from the rectification of the external fluctuating signal by the asymmetric nanostructure and is not disturbed significantly by other internal noise sources of the electrical equipment [1]. Note also that the output electric current I(t) is slave of the input potential V R (t) because the period of this potential is much longer than the relaxation time characteristic of the small solution volumes found in nanopores [17][18][19] and ion channels [12]. This (adiabatic) limit is valid for low enough frequency signals [1,12,[18][19][20][21].…”

Section: Resultssupporting

confidence: 66%

“…Note also that the output electric current I(t) is slave of the input potential V R (t) because the period of this potential is much longer than the relaxation time characteristic of the small solution volumes found in nanopores [17][18][19] and ion channels [12]. This (adiabatic) limit is valid for low enough frequency signals [1,12,[18][19][20][21]. Remarkably, Fig.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Energy conversion from external fluctuating signals based on asymmetric nanopores

et al. 2015

Self Cite

View full text Add to dashboard Cite

ElsevierRamirez Hoyos, P.; Gómez Lozano, V.; Cervera, J.; Nasir, S.; Ali, M.; Ensinger, W.; Mafe, S. (2015). Energy conversion from external fluctuating signals based on asymmetric nanopores. Nano Energy. 16:375-382. doi:10.1016Energy. 16:375-382. doi:10. /j.nanoen.2015 AbstractElectrical transduction from fluctuating external signals is central to energy conversion based on nanoscale electrochemical devices and bioelectronics interfaces. We demonstrate theoretically and experimentally a significant energy transduction from white noise signals using the electrical rectification of asymmetric nanopores in polymeric membranes immersed in aqueous electrolyte solutions. Load capacitor voltages of the order of 1 V are obtained within times of the order of 1 min by means of nanofluidic diodes which convert zero time-average potentials of amplitudes of the order of 1 V into average net currents. We consider singlenanopore and multipore membranes to show that the conversion processes can be significantly increased by scaling. The results concern a wide range of operating electrolyte concentrations.Because these concentrations dictate the pore resistance, the tuning of the load capacitance to optimize the system response at each concentration is also addressed. Finally, the experimental results are described theoretically by using simple equivalent circuits with a voltage-dependent resistance in series with a load capacitance.

show abstract

Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Energy conversion from external fluctuating signals based on asymmetric nanopores

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…This transport problem has been studied for the cases of particle capture using nanopores 11,12 and ionic transport phenomena through fixedcharge membranes. [15][16][17] Assuming that the NP arrival rate to the pore mouth can be estimated from the steady-state flux of particles translocating through the pore when r < R, 11,16 we obtain:…”

Section: Resultsmentioning

confidence: 99%

Current rectification by nanoparticle blocking in single cylindrical nanopores

et al. 2014

Self Cite

View full text Add to dashboard Cite

Royal Society of ChemistryAli, M.; Ramirez Hoyos, P.; Nasir, S.; Nguyen, Q.; Ensinger, W.; Mafé, S. (2014) Blocking of a charged pore by an oppositely charged nanoparticle can support rectifying properties in a cylindrical nanopore, as opposed to the usual case of a fixed asymmetry in the pore geometry and charge distribution. We present here experimental data and model calculations to confirm this fundamental effect. The nanostructure imaging and the effects of nanoparticle concentration, pore radius, and salt concentration on the electrical conductancevoltage (G-V) curves are discussed. Logic responses based on chemical and electrical inputs/outputs could also be implemented with a single pore acting as an effective nanofluidic diode. To better show the generality of the results, different charge states and relative sizes of the nanopore and the nanoparticle are considered, emphasizing those physical concepts that are also found in the ionic drug blocking of protein ion channels.

show abstract

“…24 Equations (1)- (3) can be integrated numerically to give the ionic flux densities, and then the total electric current I through the nanopore, at each applied voltage V (see references 22 and 26 for details). The above model is useful to describe the IV curves of different nanopores [22][23][24][25][26] using a reduced number of fitting parameters. Figure 2d-f shows that this is also the case of the present experimental results.…”

mentioning

confidence: 99%

Ionic Transport through Chemically Functionalized Hydrogen Peroxide-Sensitive Asymmetric Nanopores

Ali

Ahmed

Nasir

et al. 2015

ACS Appl. Mater. Interfaces

Self Cite

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

Net currents obtained from zero-average potentials in single amphoteric nanopores

Cited by 19 publications

References 39 publications

Energy conversion from external fluctuating signals based on asymmetric nanopores

Energy conversion from external fluctuating signals based on asymmetric nanopores

Current rectification by nanoparticle blocking in single cylindrical nanopores

Ionic Transport through Chemically Functionalized Hydrogen Peroxide-Sensitive Asymmetric Nanopores

Contact Info

Product

Resources

About