Encapsulated High-Entropy-Alloy Nanoparticles within Graphitic Shell for Improved Long-Term Prevention of...

Area of Science:

• Materials Science
• Corrosion Science
• Nanotechnology

Background:

• Microbiologically influenced corrosion (MIC) is a significant global economic problem driven by anaerobic biofilms.
• Existing MIC inhibition (MICI) methods lack durability and mechanistic understanding.

Purpose of the Study:

• To develop an efficient and durable MICI strategy using novel high-entropy alloy nanoparticles encapsulated within graphitic shells (HEA@C-NPs).
• To investigate the synergistic mechanisms of HEA@C-NPs in preventing biofilm formation and eradicating corrosive bacteria.

Main Methods:

• Synthesis and characterization of FeNiTiCrMnCuₓ high-entropy alloy nanoparticles encapsulated within graphitic shells (HEA@C-NPs).
• Evaluation of HEA@C-NPs' performance in inhibiting planktonic and biofilm growth of Desulfovibrio vulgaris Hildenborough.
• Assessment of MICI efficiency on Q235 carbon steel in different corrosive media over extended periods.

Main Results:

• The graphitic shell ensured HEA@C-NPs' stability and controlled copper ion release, enhancing durability.
• HEA@C-NPs demonstrated enzyme-like activity, generating reactive oxygen species to suppress bacterial metabolism and eradicate biofilms, achieving 99.99% inhibition of planktonic growth.
• Optimized FeNiTiCrMnCu₂@C HEA-NPs achieved 95% MICI efficiency against sulfate-reducing bacteria on carbon steel, with sustained inhibition for over 28 days.

Conclusions:

• HEA@C-NPs represent a transformative approach for sustainable MICI, offering enhanced durability and efficiency.
• This study pioneers a new class of antibiofilm agents with significant potential for industrial applications in corrosion prevention.