scholarly journals Spatial blockage of ionic current for electrophoretic translocation of DNA through a graphene nanopore

2014 ◽  
Vol 35 (8) ◽  
pp. 1144-1151 ◽  
Author(s):  
Wenping Lv ◽  
Shengju Liu ◽  
Xin Li ◽  
Ren'an Wu
Keyword(s):  
Ionic Current ◽  
Graphene Nanopore

A Spike-Like Ionic Current Behavior via Graphene Nanopore

2013 ◽  
Vol 475-476 ◽  
pp. 1351-1354
Author(s):  
Gen Sheng Wu ◽  
Jing Jie Sha ◽  
Lei Liu ◽  
Yun Fei Chen
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Plasma Etching ◽  
Ionic Current ◽  
Bubble Surface ◽  
Graphene Surface ◽  
Transmission Electron ◽  
Medical Sensors ◽  
Current Behavior ◽  
Graphene Nanopore

Ionic current characterization is critical for the application of nanopores with sub 5 nm as bio medical sensors and devices. Here, we demonstrate an eccentric ionic current behavior in graphene nanopore fabricated by high resolution transmission electron microscopy (HR-TEM). A spike-like current enhancement is shown in the absence of any bio molecule or nanoparticle in the LaCl3and KCl solution. By tuning the hydrophobicity of the graphene surface, the spikes diminish in the current recordings acquired in graphene nanopore after 20 seconds plasma etching. We consider that the hydrophocity-induced nanobubble is present in the nanopore area, leading to the currents change as the bubbles deformation due to the voltage driven electrostatic forces on the transported ions surrounding the bubble surface.

scholarly journals Spatial blockage of ionic current for electrophoretic translocation of DNA through a graphene nanopore

2014 ◽  
Vol 35 (8) ◽  
pp. NA-NA
Author(s):  
Wenping Lv ◽  
Shengju Liu ◽  
Xin Li ◽  
Ren'an Wu
Keyword(s):  
Ionic Current ◽  
Graphene Nanopore

Electric-Field Effects on Reactions Between Oxides

1997 ◽  
Vol 481 ◽  
Author(s):  
Matthew T. Johnson ◽  
Shelley R. Gilliss ◽  
C. Barry Carter
Keyword(s):  
Solid State ◽  
Electric Field ◽  
Elevated Temperatures ◽  
Ionic Current ◽  
Reaction Rates ◽  
Solid State Reactions ◽  
Interfacial Stability ◽  
Electric Field Effects ◽  
Thin Film Diffusion ◽  
Microscopy Techniques

ABSTRACTThin films of In2O3 and Fe2O3 have been deposited on (001) MgO using pulsed-laser deposition (PLD). These thin-film diffusion couples were then reacted in an applied electric field at elevated temperatures. In this type of solid-state reaction, both the reaction rate and the interfacial stability are affected by the transport properties of the reacting ions. The electric field provides a very large external driving force that influences the diffusion of the cations in the constitutive layers. This induced ionic current causes changes in the reaction rates, interfacial stability and distribution of the phases. Through the use of electron microscopy techniques the reaction kinetics and interface morphology have been investigated in these spinel-forming systems, to gain a better understanding of the influence of an electric field on solid-state reactions.

Mass Transport through a Sub-10 nm Single Gold Nanopore: SERS and Ionic Current Measurement

2021 ◽  
pp. 115373
Author(s):  
Qi Shen ◽  
Pan-Ling Zhou ◽  
Bin-Tong Huang ◽  
Juan Zhou ◽  
Hai-Ling Liu ◽  
...  
Keyword(s):  
Mass Transport ◽  
Ionic Current ◽  
Current Measurement

Translocation of alkane through graphene nanopore: A molecular dynamics simulation study

2014 ◽  
Vol 89 (2) ◽  
pp. 302-308 ◽  
Author(s):  
Jun-Yin Li ◽  
Hua Yang ◽  
Yan-Zhen Sheng ◽  
Xin-Ting Zhao ◽  
Miao Sun
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Simulation Study ◽  
Dynamics Simulation ◽  
Graphene Nanopore

Probing Porous Structure of Single Manganese Oxide Mesorods with Ionic Current

2013 ◽  
Vol 117 (47) ◽  
pp. 24836-24842 ◽  
Author(s):  
Trevor Gamble ◽  
Eleanor Gillette ◽  
Sang Bok Lee ◽  
Zuzanna S. Siwy
Keyword(s):  
Porous Structure ◽  
Manganese Oxide ◽  
Ionic Current

scholarly journals Correlation between Charge Movement and Ionic Current during Slow Inactivation in Shaker K+ Channels

1997 ◽  
Vol 110 (5) ◽  
pp. 579-589 ◽  
Author(s):  
Riccardo Olcese ◽  
Ramón Latorre ◽  
Ligia Toro ◽  
Francisco Bezanilla ◽  
Enrico Stefani
Keyword(s):  
Time Course ◽  
Voltage Dependence ◽  
Ionic Current ◽  
K Channel ◽  
Charge Movement ◽  
Slow Inactivation ◽  
Gating Currents ◽  
Similar Time ◽  
K Channels ◽  
Recovery From Inactivation

Prolonged depolarization induces a slow inactivation process in some K+ channels. We have studied ionic and gating currents during long depolarizations in the mutant Shaker H4-Δ(6–46) K+ channel and in the nonconducting mutant (Shaker H4-Δ(6–46)-W434F). These channels lack the amino terminus that confers the fast (N-type) inactivation (Hoshi, T., W.N. Zagotta, and R.W. Aldrich. 1991. Neuron. 7:547–556). Channels were expressed in oocytes and currents were measured with the cut-open-oocyte and patch-clamp techniques. In both clones, the curves describing the voltage dependence of the charge movement were shifted toward more negative potentials when the holding potential was maintained at depolarized potentials. The evidences that this new voltage dependence of the charge movement in the depolarized condition is associated with the process of slow inactivation are the following: (a) the installation of both the slow inactivation of the ionic current and the inactivation of the charge in response to a sustained 1-min depolarization to 0 mV followed the same time course; and (b) the recovery from inactivation of both ionic and gating currents (induced by repolarizations to −90 mV after a 1-min inactivating pulse at 0 mV) also followed a similar time course. Although prolonged depolarizations induce inactivation of the majority of the channels, a small fraction remains non–slow inactivated. The voltage dependence of this fraction of channels remained unaltered, suggesting that their activation pathway was unmodified by prolonged depolarization. The data could be fitted to a sequential model for Shaker K+ channels (Bezanilla, F., E. Perozo, and E. Stefani. 1994. Biophys. J. 66:1011–1021), with the addition of a series of parallel nonconducting (inactivated) states that become populated during prolonged depolarization. The data suggest that prolonged depolarization modifies the conformation of the voltage sensor and that this change can be associated with the process of slow inactivation.

Analysis of Plasma Properties and Deposition of Amorphous Silicon Alloy Solar Cells Using Very High Frequency Glow Discharge

1999 ◽  
Vol 557 ◽  
Author(s):  
B. Yan ◽  
J. Yang ◽  
S. Guha ◽  
A. Gallagher
Keyword(s):  
Solar Cells ◽  
High Frequency ◽  
Lower Energy ◽  
Ionic Current ◽  
Ion Bombardment ◽  
Half Width ◽  
Rf Plasma ◽  
Very High Frequency ◽  
Very High ◽  
Ionic Energy

AbstractPositive ionic energy distributions in modified very-high-frequency (MVHF) and radio frequency (RF) glow discharges were measured using a retarding field analyzer. The ionic energy distribution for H2 plasma with 75 MHz excitation at a pressure of 0.1 torr has a peak at 22 eV with a half-width of about 6 eV. However, with 13.56 MHz excitation, the peak appears at 37 eV with a much broader half-width of 18 eV. The introduction of SiH4 to the plasma shifts the distribution to lower energy. Increasing the pressure not only shifts the distribution to lower energy but also broadens the distribution. In addition, the ionic current intensity to the substrate is about five times higher for MVHF plasma than for RF plasma. In order to study the effect of ion bombardment, the deposition of a-Si alloy solar cells using MVHF was investigated in detail at different pressures and external biases. Lowering the pressure and negatively biasing the substrate increases ion bombardment energy and results in a deterioration of cell performance. It indicates that ion bombardment is not beneficial for making solar cells using MVHF. By optimizing the deposition conditions, a 10.8% initial efficiency of a-Si/a-SiGe/SiGe triple-junction solar cell was achieved at a deposition rate of 0.6 nm/sec.

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