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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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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and...
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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Catalytic polyelectrolyte multilayers at the bipolar membrane interface.

Said Abdu1, Kittikun Sricharoen, John E Wong

  • 1Chemical Process Engineering, RWTH Aachen University , Turmstr. 46, 52064 Aachen, Germany.

ACS Applied Materials & Interfaces
|October 26, 2013
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Summary
This summary is machine-generated.

Layer-by-layer deposition of polyelectrolyte multilayers enhances bipolar membrane performance for efficient water splitting. Interface layer properties significantly impact catalytic activity and ionic selectivity, challenging previous assumptions about bulk membrane thickness.

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Area of Science:

  • Membrane Science and Technology
  • Electrochemistry
  • Materials Science

Background:

  • Bipolar membranes (BPMs) efficiently split water at their interface using an electric field.
  • Current understanding primarily attributes BPM selectivity to bulk membrane thickness.

Purpose of the Study:

  • To investigate layer-by-layer (LbL) deposition of polyelectrolyte multilayers for introducing catalytic groups at the BPM interface.
  • To explore the influence of LbL parameters on BPM performance, including catalytic activity and ionic selectivity.

Main Methods:

  • Fabrication of BPMs using LbL assembly to modify anion exchange membranes.
  • Casting of intermediate and cation exchange layers.
  • Systematic variation of LbL parameters such as ionic strength and number of layers.

Main Results:

  • Higher charge density polyelectrolytes on the anion exchange layer improved performance.
  • Ionic strength and number of LbL layers significantly influenced catalytic activity and ionic selectivity.
  • A specific membrane configuration (two bilayers of PEDOT:PSS/PEI with PEI in 0.5 M NaCl) exhibited optimal performance.

Conclusions:

  • LbL deposition is an effective method for functionalizing BPM interfaces.
  • Interface layer properties play a crucial role in BPM permselectivity, contrary to previous beliefs focused on bulk thickness.