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Related Concept Videos

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

Potentiometry: Types of Electrodes

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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.
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...
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Electrodes: Overview01:17

Electrodes: Overview

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 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
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Ion Exchange01:17

Ion Exchange

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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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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

1.6K
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Electrochemical Preparation of Poly3,4-Ethylenedioxythiophene Layers on Gold Microelectrodes for Uric Acid-Sensing Applications
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Solid-Contact Ion-Selective and Reference Electrodes Covalently Attached to Functionalized Poly(ethylene

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    Researchers developed novel solid-contact ion-selective electrodes by covalently attaching membranes to plastic substrates, significantly improving sensor durability and preventing delamination under mechanical stress for reliable point-of-care sensing.

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    Area of Science:

    • Materials Science
    • Electrochemistry
    • Sensor Technology

    Background:

    • Traditional ion-selective electrodes (ISEs) often use bulky designs with aqueous inner solutions.
    • Recent trends focus on planarizable solid-contact electrodes for point-of-care and wearable applications.
    • A major limitation of current solid-contact ISEs is membrane delamination from the substrate under mechanical or thermal stress, reducing sensor lifetime.

    Purpose of the Study:

    • To develop a robust sensing platform that prevents membrane delamination in solid-contact ion-selective electrodes.
    • To create ion-selective and reference electrodes with enhanced long-term performance and mechanical stability.
    • To demonstrate a versatile method for covalently attaching sensing and reference membranes to various plastic substrates.

    Main Methods:

    • Designed a sensing platform using poly(ethylene terephthalate) (PET) substrates.
    • Covalently attached polyacrylate-based sensing membranes and polymethacrylate-based reference membranes to functionalized PET via photopolymerization.
    • Prepared H+- and K+-selective electrodes and reference electrodes using ionophore- and ionic-liquid-doped membranes.

    Main Results:

    • Successfully achieved covalent attachment between the substrate and the membranes, preventing delamination even under repeated mechanical stress.
    • Prepared H+- and K+-selective electrodes exhibited highly selective responses with Nernstian slopes.
    • Reference electrodes provided stable, sample-independent reference potentials across a broad range of electrolyte concentrations.

    Conclusions:

    • Covalent attachment of sensing and reference membranes to plastic substrates offers a highly promising solution to the long-standing problem of membrane delamination in ISEs and field-effect transistors.
    • This approach significantly improves the long-term performance and reliability of solid-contact electrodes.
    • The method is adaptable to various polyester, polyamide, and polyurethane materials, broadening its applicability.