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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...
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Pickering Membranes Stabilized by Saturn Particles.

Matthias M Krejca1, Cornell Wüstner1, Werner A Goedel1

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Researchers created novel Saturn particles that form stable Pickering foams and membranes without surfactants. These membranes exhibit gas permeability, with performance aligning with theoretical predictions.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Nanotechnology

Background:

  • Conventional Pickering foams and membranes often rely on low molar mass surfactants.
  • Developing surfactant-free systems is crucial for environmental and application-specific reasons.

Purpose of the Study:

  • To introduce a novel particle design, termed Saturn particles, for creating stable Pickering foams and membranes.
  • To investigate the formation and properties of these surfactant-free Pickering membranes, particularly their gas permeability.

Main Methods:

  • Synthesis of unique Janus particles with opposing hydrophobic caps and a hydrophilic belt.
  • Formation of Pickering foams and membranes by mixing Saturn particles with water and air.
  • Characterization of membrane structure and measurement of gas permeance.

Main Results:

  • Saturn particles readily formed stable Pickering foams and membranes in water-air mixtures without surfactants.
  • The resulting Pickering membranes featured embedded particles with caps exposed to air.
  • These membranes demonstrated gas permeability, with permeance values correlating with gas solubility and diffusion coefficients.

Conclusions:

  • Saturn particles offer a novel route to surfactant-free Pickering foams and membranes.
  • The unique structure of Saturn particles facilitates the formation of stable, gas-permeable liquid membranes.
  • The findings suggest potential applications in gas separation and other membrane technologies.