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Bioinspired micro/nano structured aluminum with multifaceted applications.

Priya Mandal1, Jayanth Ivvala2, Harpreet S Arora2

  • 1Department of Physics, School of Natural Sciences, Shiv Nadar University, Gautam Buddha Nagar, Uttar Pradesh 201314, India.

Colloids and Surfaces. B, Biointerfaces
|January 3, 2022
PubMed
Summary

Researchers developed eco-friendly superhydrophobic aluminum surfaces inspired by nature. These surfaces exhibit excellent water, dust, and bacterial repellency, along with corrosion resistance, offering multifunctional applications.

Keywords:
AntibacterialCorrosion resistanceE. coliSelf-cleaningSuperhydrophilicSuperhydrophobic

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Biomimetics

Background:

  • Biological systems like lotus leaves inspire artificial superhydrophobic surfaces.
  • Developing multifunctional surfaces with tunable wettability is a key research area.
  • Aluminum's properties make it a suitable substrate for advanced surface engineering.

Purpose of the Study:

  • To develop a simple, ecological, large-scale fabrication method for nanostructured aluminum surfaces.
  • To achieve tunable wettability, ranging from superhydrophilic to superhydrophobic.
  • To impart multiple functionalities including water, bacterial, and dust repellency, alongside corrosion resistance.

Main Methods:

  • Employed a simple and ecological synthesis route for self-assembled nanostructures on aluminum ('Nano' and 'Hierarchy' surfaces).
  • Modified nanostructured surfaces with 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FOTES) to achieve superhydrophobicity.
  • Characterized surface properties including contact angle, contact angle hysteresis (CAH), corrosion resistance, and antibacterial activity.

Main Results:

  • Achieved superhydrophobic surfaces with a static contact angle of 163° ± 1° and CAH of ~3° after FOTES modification.
  • Demonstrated significant corrosion resistance (current density 6 nA/cm², 40x lower than untreated).
  • Exhibited excellent self-cleaning (low water consumption < 0.1 µl/mm²-mg), anti-biofouling, and antibacterial properties.

Conclusions:

  • The developed method enables large-scale fabrication of sustainable, multifunctional biomimetic aluminum surfaces.
  • Tunable wettability and enhanced properties offer broad applicability in various environments.
  • Nanostructured superhydrophilic aluminum surfaces show potent antibacterial activity via cell membrane disruption.