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Perversions with a twist.

Pedro E S Silva1, Joao L Trigueiros2, Ana C Trindade3

  • 1Department of Physics/Institute for Biomedicine -iBiMED, University of Aveiro, Campus Universitario de Santiago, 3810-193, Aveiro Portugal.

Scientific Reports
|March 31, 2016
PubMed
Summary
This summary is machine-generated.

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Scientists discovered new types of helical perversions in elastic filaments, like those in plant tendrils. These defects have different geometries and behaviors, and their formation can be controlled with UV light.

Area of Science:

  • Physics
  • Materials Science
  • Biophysics

Background:

  • Helical structures with symmetric handedness, known as perversions, are observed in nature, such as in plant tendrils and decorative ribbons.
  • These perversions occur in elastic filaments that coil into helices while maintaining zero overall twist.
  • Understanding these defects is crucial for comprehending the mechanics of natural structures and engineered materials.

Purpose of the Study:

  • To investigate the existence and properties of different types of perversions in elastic filaments.
  • To explore the mathematical and experimental basis for these perversions.
  • To determine if perversions exhibit varied geometries and behaviors.

Main Methods:

  • Mathematical modeling was employed to analyze the theoretical possibilities of perversions.

Related Experiment Videos

  • Experimental generation of perversions was achieved using micro electrospun fibers.
  • The behavior of these perversions upon release and their final configurations were observed.

    • Main Results:

    • A continuous range of different perversions with distinct geometries was mathematically and experimentally demonstrated.
    • Experimental results confirmed that these perversions exhibit different behaviors and adopt varied final configurations.
    • The study showed that the formation and shape of microfilaments, specifically electrospun fibers, can be controlled using ultraviolet (UV) light.

    Conclusions:

    • Multiple types of perversions in elastic filaments exist, each with unique geometric and behavioral characteristics.
    • The formation of these microstructural defects can be precisely controlled, offering potential applications in materials engineering.
    • The findings contribute to a deeper understanding of mechanical instabilities in helical structures and provide methods for on-demand microfilament manipulation.