journal article·2018-03-27

Hexagonal Boron Nitride: The Thinnest Insulating Barrier to Microbial Corrosion

Govinda Chilkoor, Sushma Priyanka Karanam, Shane Star, Namita Shrestha, Rajesh K. Sani, Venkata K.K. Upadhyayula, Debjit Ghoshal, Nikhil A. Koratkar, M. Meyyappan, Venkataramana Gadhamshetty

ACS Nano· Volume 12· Issue 3
Publisher page

Abstract

We report the use of a single layer of two-dimensional hexagonal boron nitride (SL-hBN) as the thinnest insulating barrier to microbial corrosion induced by the sulfate-reducing bacteria Desulfovibrio alaskensis G20. We used electrochemical methods to assess the corrosion resistance of SL-hBN on copper against the effects of both the planktonic and sessile forms of the sulfate-reducing bacteria. Cyclic voltammetry results show that SL-hBN-Cu is effective in suppressing corrosion effects of the planktonic cells at potentials as high as 0.2 V ( vs Ag/AgCl). The peak anodic current for the SL-hBN coatings is ∼36 times lower than that of bare Cu. Linear polarization resistance tests confirm that the SL-hBN coatings serve as a barrier against corrosive effects of the G20 biofilm when compared to bare Cu. The SL-hBN serves as an impermeable barrier to aggressive metabolites and offers ∼91% corrosion inhibition efficiency, which is comparable to much thicker commercial coatings such as polyaniline. In addition to impermeability, the insulating nature of SL-hBN suppresses galvanic effects and improves its ability to combat microbial corrosion.
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Research context

OpenAlex topics: Corrosion Behavior and Inhibition · Concrete Corrosion and Durability · Marine Biology and Environmental Chemistry

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Green Technologies and Environmental Economics Platform, Chemistry Department, Umea University, Umea, Sweden, 90187

Center for Nanotechnology, NASA Ames Research Center, Moffett Field, Mountain View, California 94035, United States

Funding

South Dakota Board of Regents · National Aeronautics and Space Administration · Division of Chemical, Bioengineering, Environmental, and Transport Systems

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