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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Related Experiment Video

Updated: Sep 6, 2025

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Ionic transistor using ion exchange membranes.

Chaojun Cheng1, Mohamed Z Rashed2, Gene Y Fridman2,3,4

  • 1Mechanical Engineering, Johns Hopkins University, USA.

Lab on a Chip
|June 24, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a novel ionic transistor utilizing cation and anion exchange membranes. This device achieves stable ionic current modulation in physiological solutions, crucial for advanced biomedical applications.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Ionic transistors offer a pathway to control ionic currents, similar to electronic transistors.
  • Applications in biomedical devices require stable ionic current control in physiological solutions.
  • Existing ionic transistors face challenges in long-term performance and stability in saline environments.

Purpose of the Study:

  • To develop a stable and high-performance ionic transistor for biomedical applications.
  • To demonstrate ionic current modulation in physiological solutions using a novel membrane-based design.
  • To assess the long-term stability and switching performance of the ionic transistor.

Main Methods:

  • Fabrication of an ionic transistor using cation exchange membranes (CEM) and anion exchange membranes (AEM).
  • Testing the device's performance in a 0.9% NaCl solution, mimicking physiological conditions.
  • Evaluating the impedance change and stability over 1000 cycles of on/off switching.

Main Results:

  • The ionic transistor demonstrated a 10-fold change in impedance within a 0.9% NaCl solution.
  • Stable modulation of ionic current was observed throughout 1000 cycles of operation.
  • The device maintained performance in physiological saline, indicating potential for biomedical use.

Conclusions:

  • The developed ionic transistor, using CEM and AEM, shows significant potential for biomedical applications requiring precise ionic current control.
  • The device's stability and performance in physiological solutions address key limitations of current technologies.
  • This work paves the way for advanced drug delivery, ionic signal processing, and current rectification systems.