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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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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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Potentiometry: Types of Electrodes01:19

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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
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Controlled-Current Coulometry: Overview01:27

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
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On-chip ionic current sensor.

Chaojun Cheng1, Grace Foxworthy2, Gene Fridman3,2,4

  • 1Mechanical Engineering, Johns Hopkins University, Baltimore, USA.

Applied Physics. A, Materials Science & Processing
|February 2, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel on-chip sensor to measure ionic current in neural implants with branched microfluidic channels. This innovation enables precise drug and electrical stimulation delivery for treating neurological disorders.

Keywords:
Ionic currentOn-chipQuantificationSensor

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Materials Science

Background:

  • Neural implants utilize microfluidic ports for drug delivery and electrical stimulation in treating epilepsy, chronic pain, and vestibular disorders.
  • Accurate measurement of ionic current is crucial for controlling therapeutic delivery in neural implants.
  • Branched microfluidic channels in advanced neural implants complicate ionic current measurement using traditional electronic sensors.

Purpose of the Study:

  • To develop an on-chip sensor for accurately measuring ionic current in neural implants with complex microfluidic architectures.
  • To overcome the limitations of electronic current sensing in devices with branched channels.

Main Methods:

  • An on-chip sensor utilizing two platinum-iridium (Pt/Ir) electrodes was designed to transduce ionic current into a measurable voltage signal.
  • The sensor was integrated into microfluidic channels to test its performance.

Main Results:

  • The sensor successfully transduced ionic current into a voltage signal, enabling measurement in branched channels.
  • Sensor sensitivity is determined by the channel size between electrodes; wire size had no impact.
  • Measurement stability was achieved with high input impedance (>1 GΩ) and was maintained over a one-week test.
  • Temperature fluctuations can affect readings, necessitating control or compensation.

Conclusions:

  • The developed on-chip sensor provides a viable method for measuring ionic current in neural implants with branched microfluidic channels.
  • This technology can enhance the precision and efficacy of therapeutic delivery for neurological conditions.
  • Further optimization regarding temperature effects may be required for specific applications.