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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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Asymmetric Lipid Bilayer01:35

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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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What is an Electrochemical Gradient?01:26

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Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
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Membrane Asymmetry Regulating Transporters01:19

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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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Electrochemical Gradient and Channel Proteins: An Overview01:21

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An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
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Updated: Jan 7, 2026

Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination
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Asymmetric Two-Dimensional Nanomembranes for Salinity Gradient Energy Conversion.

Sungsoon Kim1,2, Hong Choi1,2, Jihun Yeom1,2

  • 1Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, South Korea.

Nano Letters
|January 5, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel membrane for salinity gradient energy conversion, achieving high power density. The new design overcomes previous limitations, paving the way for practical blue energy devices.

Keywords:
2D materialAsymmetric nanochannelIonic rectificationMembraneVermiculite

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Salinity gradient energy is a promising renewable source.
  • Membrane performance is limited by ion selectivity and permeability trade-offs.
  • Existing technologies face challenges in power output and scalability.

Purpose of the Study:

  • To design and engineer a novel membrane for enhanced salinity gradient energy conversion.
  • To overcome the limitations of ion selectivity and permeability in membranes.
  • To achieve high power densities for practical blue energy applications.

Main Methods:

  • Engineered a membrane with millimeter-scale lateral channels and angstrom height.
  • Utilized a localized spark reaction on vermiculite films for monolithic asymmetric architecture.
  • Fabricated modules of 900 cells for testing.

Main Results:

  • Achieved enhanced ion selectivity (95.1% Na+) and a rectification ratio (R ≈ 10).
  • Sustained power densities exceeding 5.0 W/m² in multi-cell modules.
  • Demonstrated potential for charging consumer electronics like smartphones.

Conclusions:

  • The developed membrane architecture addresses key performance and scalability barriers.
  • This breakthrough offers a pathway toward high-power, practical blue energy harvesting.
  • The technology shows significant potential for widespread adoption in salinity gradient energy conversion.