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Highly efficient antifogging/antimicrobial dual-functional chitosan based coating for optical devices.

Basheer Mansoor1, Shanshan Li2, Wei Chen3

  • 1National Synchrotron Radiation Laboratory, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei 230026, China; Institutes of Physical Science and Information Technology, Anhui University, Hefei 230026, China.

Carbohydrate Polymers
|September 10, 2022
PubMed
Summary
This summary is machine-generated.

This study developed a dual-functional chitosan coating for glass surfaces, providing excellent anti-fogging and anti-microbial properties. The coating effectively inhibits microbial growth and fogging, crucial for high-humidity applications.

Keywords:
Anti-fogging/anti-microbialChitosanCoatingLow field nuclear magnetic resonance (LF-NMR)

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Biotechnology

Background:

  • Surfaces with anti-fogging and anti-microbial properties are crucial in high-humidity environments, particularly for applications relevant during pandemics like COVID-19.
  • Modifying product surfaces with coatings is a common strategy to impart new functionalities without altering intrinsic material properties.
  • There is a growing demand for transparent, dual-functional coatings that can simultaneously prevent fogging and inhibit microbial proliferation.

Purpose of the Study:

  • To develop a simple, one-pot method for creating a dual-functional chitosan-based coating on glass substrates.
  • To evaluate the anti-fogging and anti-microbial efficacy of the developed chitosan/silica (Ch/SiO2) coating.
  • To determine the optimal bound water content required for effective anti-fogging and anti-microbial performance.

Main Methods:

  • A one-pot technique was employed to incorporate a dual-functional chitosan (Ch) polysaccharide coating onto glass substrates.
  • The coating's anti-fogging performance was assessed using hot/cold fogging tests.
  • Anti-microbial activity was evaluated using the plate count method, and bound water content was confirmed via low-field nuclear magnetic resonance (LF-NMR).

Main Results:

  • The dual-functional Ch/SiO2(3) layer exhibited excellent anti-fogging properties and significant anti-microbial activity.
  • Hydrogen bonds and electrostatic attractions between chitosan and silica nanoparticles contributed to a higher bound water ratio.
  • A minimum of 95% bound water in the final layer structure was identified as necessary to completely inhibit microbial and fogging activities.

Conclusions:

  • The developed chitosan/silica coating offers a promising solution for creating surfaces with combined anti-fogging and anti-microbial functionalities.
  • The simple one-pot method provides an efficient route for fabricating these advanced functional coatings.
  • Achieving a high bound water content (≥95%) is critical for the coating's dual performance, highlighting the importance of controlled water interactions at the nanoscale.