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Related Concept Videos

Membrane Fluidity01:23

Membrane Fluidity

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
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Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes
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Tunable ultrathin membranes with nonvolatile pore shape memory.

Hidenori Kuroki1, Crescent Islam1, Igor Tokarev1

  • 1†Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699, United States.

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|April 28, 2015
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Summary

Responsive nanoporous thin-film gel membranes offer tunable pore sizes triggered by molecular signals. These "smart" membranes can be "taught" to retain specific pore geometries for advanced separation applications.

Keywords:
nanostructurepore memoryresponsive membranesize-selective filtrationtemplate

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Developing advanced separation technologies is crucial for various industrial processes.
  • Nanoporous membranes offer high selectivity but often lack tunability and memory effects.
  • Existing membranes struggle with precise control over pore size and shape for specific applications.

Purpose of the Study:

  • To report the development of responsive nanoporous thin-film gel membranes.
  • To demonstrate the ability to tune pore size using molecular signals.
  • To achieve a "memory" effect for pore geometry in the membranes.

Main Methods:

  • Fabrication of thin-film membranes (∼100 nm) via dip-coating using a copolymer and latex nanoparticles as sacrificial templates.
  • Stabilization of films through photo-cross-linking followed by template removal to create nanoporous structures.
  • Reversible regulation of pore dimensions and size-selective cutoff using swelling-shrinking of the polymer network induced by low-molar-mass compounds.

Main Results:

  • Successfully created thin-film gel membranes with tunable nanoporous structures.
  • Achieved narrow pore size distribution and high porosity in the fabricated membranes.
  • Demonstrated reversible control over pore dimensions and colloidal particle cutoff.
  • Showcased the "memorization" of pore geometry in aqueous media and its "erasure" in specific solvents.

Conclusions:

  • The developed responsive nanoporous membranes offer a novel platform for tunable size-selective barriers.
  • The "memory" characteristic of pore geometry opens new avenues for advanced filtration and separation processes.
  • These membranes show significant potential for applications in colloid separation and beyond.