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Using Biotechnology to Solve Engineering Problems: Non-Destructive Testing of Microfabrication Components.

Carla C C R de Carvalho1, Patrick L Inácio2, Rosa M Miranda3

  • 1iBB-Institute for Bioengineering and Biosciences, Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal. ccarvalho@tecnico.ulisboa.pt.

Materials (Basel, Switzerland)
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Summary

This study introduces a novel non-destructive testing (NDT) method using bacterial cells to detect micro and nano surface defects in metals. This biological approach enhances defect identification on various metal alloys.

Keywords:
NDTRhodococcusStaphylococcusindentationmicro defectsmicrofabrication

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Area of Science:

  • Materials Science
  • Biotechnology
  • Non-Destructive Testing

Background:

  • Miniaturization in technology necessitates advanced non-destructive testing (NDT) for micro-scale defect detection.
  • Existing NDT methods face limitations with small sample sizes.
  • There is a need for innovative techniques to identify micro and nano surface defects.

Purpose of the Study:

  • To propose and evaluate the use of bacterial cells for detecting surface defects in metals.
  • To investigate methods for optimizing bacterial cell distribution and penetration into defects.
  • To demonstrate the capability of this biological NDT approach for various metal alloys.

Main Methods:

  • Bacterial cells were applied to metal surfaces with induced micro and nano defects.
  • Magnetic and electric fields were used to distribute cells and enhance penetration into defects.
  • Fluorophores were employed to stain bacterial cells for defect visualization.
  • Cellular properties (size, zeta potential, siderophores, biosurfactants) were considered for improved detection.

Main Results:

  • Bacterial cells successfully identified micro and nano surface defects in aluminum, steel, and copper alloys.
  • The application of fields ensured uniform cell distribution and improved defect penetration.
  • Fluorescent staining enabled clear visualization and identification of defect locations.
  • The method proved effective with *Staphylococcus* strains and *Rhodococcus erythropolis*.

Conclusions:

  • Bacterial cells offer a promising biological tool for non-destructive testing of micro and nano surface defects in metals.
  • Field-assisted cell deposition and fluorescent labeling are effective for defect detection.
  • This method overcomes limitations of traditional NDT for small samples and various alloys.