Developments in micro- and nano-defects detection using bacterial cells

Telmo G. Santos, R. M. Miranda, Maria Teresa Freire Vieira, A. Rita Farinha, Telma J. Ferreira, Luísa Quintino, Pedro Vilaça, Carla C C R De Carvalho

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


This paper describes improvements to the Nondestructive Testing (NDT) technique recently proposed, based on the use of bacterial cell suspensions to identify micro- and nano-surface defects. New bacterial strains were used with magnetic fields to improve bacteria mobility. Different materials and defect morphologies were tested, including nanoindentation defects, micro-powder injection moulding components and micro-laser welding. Nanoindentations with 0.6 μm depth and 5.3 μm side length were successfully detected. Bacterial cells allow identifying different topographic attributes of the surfaces, such as roughness. Cracks of about 0.5 μm wide and 10 μm depth in a reference test block Type 1 were successfully detected.

Original languageEnglish
Pages (from-to)20-28
Number of pages9
JournalNdt & E International
Publication statusPublished - Mar 2016




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