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Related Concept Videos

P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
Half wave rectifier01:20

Half wave rectifier

A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.
Full wave rectifier01:22

Full wave rectifier

A full-wave rectifier is a device that converts alternating current (AC) to direct current (DC) and is more efficient than its half-wave counterpart. It typically includes a center-tapped transformer, two diodes, and a load resistor. The secondary winding of the transformer is divided to provide two equal voltages of opposite polarities, which is the pivotal element of full-wave rectification.
Non-ohmic Devices00:51

Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A diode...
Patch Clamp01:18

Patch Clamp

Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
Diode: Reverse bias01:14

Diode: Reverse bias

A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...

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Related Experiment Video

Updated: May 30, 2026

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

pH-reversed ionic current rectification displayed by conically shaped nanochannel without any modification.

Zhijun Guo1, Jiahai Wang, Jiangtao Ren

  • 1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Changchun 130022, Jilin, PR China.

Nanoscale
|August 10, 2011
PubMed
Summary
This summary is machine-generated.

Conical nanochannels in polyethylene terephthalate membranes show unexpected ion current rectification at low pH. This discovery enables nanofluidic diodes without modifying the membrane.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Physical Chemistry

Background:

  • Conical nanochannels in polyethylene terephthalate (PET) membranes are typically expected to show minimal ion current rectification at low pH (≤3) due to the surface charge decreasing to zero.
  • Existing models suggest weaker rectification compared to nanochannels with negative surface charges under these conditions.

Purpose of the Study:

  • To investigate the ion current rectification behavior of conical nanochannels in PET membranes at low pH and low ionic strength.
  • To explore the underlying mechanisms responsible for any observed rectification, challenging previous assumptions.

Main Methods:

  • Fabrication of conical nanochannels in PET membranes.
  • Electrolyte conductivity measurements using buffer solutions at pH values below 3 and low ionic strength.
  • Application of voltage scans beyond ±2V to observe ion current behavior.

Main Results:

  • Conical nanochannels exhibited distinct ion current rectification at pH values below 3 in low ionic strength buffer solutions.
  • This rectification behavior was consistent with nanochannels possessing a positive surface charge.
  • The observed rectification is attributed to the further protonation of the hydrogel layer or neutral carboxylic acid within the nanochannel.

Conclusions:

  • The study reveals a pH-reversed ion current rectification in conical nanochannels, contrary to prior expectations.
  • This phenomenon can be harnessed to create a functional nanofluidic diode without any modifications to the PET membrane.
  • The findings contribute to a deeper understanding of nanochannel behavior and expand the possibilities for nanofluidic device applications.