Antimicrobial Surface Coatings with Nanofibers

Team Lead: Sai Siva Gorthi, Vikram Srinivasa Raghavan
Email: saisiva@iisc.ac.in, vikrams@iisc.ac.in

Problem Statement

As the COVID-19 pandemic continues to spread globally, there is an increased focus on solutions for limiting the spread of the virus. High touch, high contact surfaces are among the known sources of infection spread. The current solution of using disinfectants has high costs and negative impact to the environment due to release of highly toxic chemicals present in the disinfectants. As these disinfectants are sprayed regularly, often multiple times a day, the economic and environmental impacts are high. A more cost effective, durable and proven solution of keeping high contact surfaces clean and preventing them from passing on infections is a much needed solution right now.

Our Approach

Two parts to the solution

  • Eco-friendly antimicrobial compounds
  • Low cost portable instruments for coating

Details of compounds

  • Compounds exhibit excellent anti-bacterial and anti-viral properties
  • Compounds are classified as biocompatible and non-toxic

Details of instrumentation

  • Electrospinning technique for coating on smaller surfaces such as filters for masks
  • Electrospray for antimicrobial micro and nano compounds (portable unit) for larger surfaces made of wood, metal, acrylic or other materials
    • Coating Thickness 0.06-0.3 micron (60 to 300 nanometres)
    • Fine surface coatings can be achieved with sub-micron, nano range
    • Requires electricity with earthing to produce fine droplets

Electric portable spray for antimicrobial micro compounds (Portable / Hand-held units)

Features:

  • Light weight and biodegradable compounds
  • Optimal pore size for ease in breathability
  • Membrane filters enhance protection for any mask

Advantages of NMesh:

  • Inactivates pathogenic microbes
  • Reduces pore size without compromising breathability
  • Flexible & light weight
  • Environment friendly
  • Can be easily coated on any woven and non-woven fabrics

Details of surfaces that are in scope

  • Surfaces including mask filters, aluminum, stainless steel, acrylic
  • Fine coating can be achieved using the same technique (electrospinning)
  •  Portable unit requires less effort
  • Antimicrobial compounds specifically designed for virus trapping and killing mechanisms
  •  Active compounds exhibit high surface energy due to their size in the sub-micron/nano range, which can interact and eliminate microbes
  •  Coating time can be optimized as per the target material area
  •  Shelf life of coating needs to be evaluated after coating on target material

Team

Instrumentation and Applied Physics Department

  1. Prof. Sai Siva Gorthi
  2. Dr. Vikram S

ShanMukha Innovations Pvt. Ltd.

  1. Kumari Sonu
  2. Yatish Dasari
  3. Akshay MutalikDesai
  4. Arun B

Current Status

 

 

Testing Results:

Filtration efficiency of Stitched Mask                       

Breathability of Stitched Mask

Electron Microscope Images of 3-ply mask filters coated with nanofibers (a) uncoated, (b & d) coated, (c) partially coated

Images of Samples coated with nanofibers

Technical Specification:

ParameterMeasurement
BreathabilityDifferential Pressure ~ 100 Pa (at 100 L/min )
Nanofibers diameter150-200 nm
Coating thickness30-60 micrometers
Antimicrobial Efficiency99.9%

Antimicrobial Efficiency Report of Nanofiber


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