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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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    Researchers developed a universal method for collecting and dispersing various nano-objects, including nanotubes, in water. This technique utilizes filtration with a dextran adjuvant, enabling easier analysis and potential applications of these nanostructures.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Polymer Chemistry

    Background:

    • Template synthesis enables the creation of diverse nano-objects like nanowires and nanotubes.
    • Layer-by-layer (LbL) assembly produces nanotubes from polyelectrolytes, but their aqueous stability is a challenge.

    Purpose of the Study:

    • To develop a universal method for collecting and dispersing membrane-templated nano-objects in aqueous solutions.
    • To address the challenges of handling flexible, water-swollen nanotubes for further analysis and applications.

    Main Methods:

    • Synthesis of gold nanowires, polypyrrole nanotubes, and polyelectrolyte nanotubes using template synthesis.
    • Characterization of nano-object morphology before and after immersion in water.
    • Evaluation of different collection and dispersion methods, focusing on filtration with a dextran adjuvant.

    Main Results:

    • LbL nanotubes lose rigidity and swell significantly in water, hindering collection and dispersion.
    • A filtration method using a dextran adjuvant proved effective for quantitative collection and dispersion of all tested cylindrical nano-objects.
    • The developed method facilitates the handling of diverse nano-objects in aqueous media.

    Conclusions:

    • A novel, universal filtration method with dextran adjuvant enables efficient collection and dispersion of membrane-templated nano-objects in water.
    • This technique overcomes the challenges associated with water-sensitive nanotubes, opening avenues for their characterization.
    • The method supports the potential use of these nano-objects as cargo nanocarriers or nanoreactors.