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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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 the...
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...

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Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing
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Published on: March 17, 2023

One-component room temperature vulcanizing-type silicone rubber-based calcium-selective electrodes.

B K Oh1, C Y Kim, H J Lee

  • 1Department of Chemistry and Research Institute of Basic Science, Kwangwoon University, 447-1 Wolgye-Dong, Nowon-Ku, Seoul 139-701, Korea.

Analytical Chemistry
|May 31, 2011
PubMed
Summary
This summary is machine-generated.

New silicone rubber membranes offer superior calcium ion sensing. These all-solid-state sensors exhibit excellent selectivity and stability, outperforming traditional electrodes with enhanced reproducibility and longevity.

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Monitoring ER/SR Calcium Release with the Targeted Ca2+ Sensor CatchER+
12:30

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Published on: May 19, 2017

Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • All-solid-state ion-selective electrodes (ISEs) are crucial for real-time ion monitoring.
  • Traditional poly(vinyl chloride) (PVC) membranes face challenges in adhesion and long-term stability.
  • Development of novel membrane materials is essential for improved sensor performance.

Purpose of the Study:

  • To develop novel calcium-selective membranes using a silicone rubber matrix for all-solid-state ion sensors.
  • To investigate the effect of formulation components on membrane properties and sensor performance.
  • To compare the performance of the new silicone rubber-based sensors with conventional PVC-based sensors.

Main Methods:

  • Formulation of membranes with a room temperature vulcanizing-type silicone rubber (RTV-1-type SR) matrix, plasticizers, lipophilic salts, and calcium-selective ionophores (ETH 129 or ETH 1001).
  • Characterization of membrane properties including resistance, solubility, and adhesion.
  • Evaluation of potentiometric performance using planar-type Ag electrodes, including selectivity coefficients, response slope, detection limit, and potential drift.
  • Assessment of sensor-to-sensor reproducibility and lifetime.

Main Results:

  • The RTV-1-type SR membranes exhibited excellent adhesion and incorporated electroactive components effectively.
  • Addition of plasticizer reduced bulk membrane resistance and improved solubility without compromising adhesion.
  • Optimized membranes showed remarkable calcium selectivity (selectivity coefficients < 10(-5) for interfering ions) due to the lipophilic salt ETH 500.
  • The silicone rubber-based sensors demonstrated potentiometric characteristics comparable to PVC-based sensors but with significantly enhanced sensor-to-sensor reproducibility and extended lifetime (3-9 weeks).

Conclusions:

  • One-component room temperature vulcanizing-type silicone rubber (RTV-1-type SR) is a viable matrix for developing high-performance calcium-selective membranes.
  • The developed all-solid-state sensors offer a promising alternative to conventional PVC-based sensors due to improved reproducibility and longevity.
  • These new membranes pave the way for more robust and reliable calcium ion detection in various applications.