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Microvoids in Bombyx mori silk. An electron microscope study.

R M Robson1

  • 1Textile Physics Laboratory, The University of Leeds, UK.

International Journal of Biological Macromolecules
|May 26, 1999
PubMed
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Researchers visualized microvoids in Bombyx mori silk using transmission electron microscopy. Distinct microvoid sizes and distributions suggest a proposed skin/core silk filament structure.

Area of Science:

  • Materials Science
  • Biomaterials Science
  • Textile Science

Background:

  • Bombyx mori silk is a natural protein fiber with a complex internal structure.
  • Understanding silk's microstructure is crucial for optimizing its material properties.
  • Previous studies have lacked detailed visualization of internal voids within silk filaments.

Purpose of the Study:

  • To investigate the size, distribution, and morphology of microvoids within Bombyx mori silk filaments.
  • To elucidate the internal structural organization of silk fibers based on void distribution.
  • To propose a structural model for silk filaments incorporating observed microvoid characteristics.

Main Methods:

  • Transmission electron microscopy (TEM) was employed to examine silk filaments.

Related Experiment Videos

  • Silver sulfide staining was used to enhance the visibility of voids and accessible molecular regions.
  • Analysis of both transverse and longitudinal sections provided detailed microstructural information.

    • Main Results:

    • Microvoids were visualized as dense silver sulfide particles within silk filaments.
    • Two distinct populations of microvoids were identified: small particles (≤8 nm) at the filament periphery and larger dendritic arrays (10-15 nm) in the core.
    • Microvoids exhibited spherical or rod-like shapes and were aligned parallel to the filament's long axis.

    Conclusions:

    • The observed distribution and morphology of microvoids support a proposed skin/core structure for Bombyx mori silk filaments.
    • This structural model provides insights into the hierarchical organization of silk at the nanoscale.
    • Further research can explore the functional implications of this microvoid arrangement on silk's mechanical properties.