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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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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Ionic Current Saturation Enabled by Cation Gating Effect in Metal-Organic-Framework Membranes.

Han Zhou1, Ting Tang1, Rong Hu1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China.

Nano Letters
|May 15, 2024
PubMed
Summary
This summary is machine-generated.

Researchers explored ion transport in 2D metal-organic-framework membranes. Cations can tune ion flow, causing a transition from linear to nonlinear ionic current, similar to biological ion channels.

Keywords:
cation gating effectionic current saturationnanoscale ion transporttunable surface chargetwo-dimensional MOFs

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Ion transport through nanoporous membranes is crucial for various applications.
  • Controlling ion flow via membrane surface charge is a theoretical concept.
  • Experimental validation of tunable ion transport in 2D materials is needed.

Purpose of the Study:

  • To experimentally investigate ion transport in intrinsically porous two-dimensional (2D) metal-organic-framework (MOF) membranes.
  • To assess the effect of cation presence on ion transport behavior.
  • To explore the potential of 2D MOF membranes for nanofluidic devices.

Main Methods:

  • Fabrication of intrinsically porous 2D MOF membranes.
  • Experimental measurement of ionic current under varying electric fields and cation concentrations.
  • Analysis of ion transport transitions and saturation phenomena.

Main Results:

  • Observed a transition from linear to nonlinear ionic current in response to applied electric fields in the presence of specific cations.
  • Ionic currents saturated at transmembrane voltages above a few hundred millivolts, dependent on cation concentration.
  • Demonstrated a cation gating effect analogous to biological ion channels.

Conclusions:

  • Cation binding at 2D MOF membrane surfaces tunes surface charge states, modulating ion transport.
  • This cation-induced gating effect offers a mechanism for controlling ion flux.
  • 2D MOF membranes show promise for developing tunable nanofluidic devices.