Project Reference: ITS/107/09

  

English Title: A Multi-level Antimicrobial Surface Coating for a Healthier Environment <中文按此>

  

Programme: Innovation and Technology Support Programme

 

Project Period: 1 October 2009 - 31 March 2011

  

Recipient Organization: The Hong Kong University of Science and Technology

Project Coordinator: King-lun YEUNG

Deputy Project Coordinator: Joseph Kai-cho KWAN

Funds Approved: HK$ 988,000

 

Abstract: 

 

The most common route for transmission of infectious diseases is by indirect contact with surfaces contaminated with infectious droplets produced by human coughing, sneezing or talking. This projects goal is to develop an environmentally benign and safe, multi-level antimicrobial coating based on smart materials for broad-spectrum, long-term disinfection of surfaces. The coating will respond intelligently to various levels of contamination from touch and infectious droplets to accordingly decontaminate local surfaces. This prevents the excessive use of biocides that could generate resistance in microorganisms. A micro-encapsulation technology using multi-functional smart polymers will be used to store the germicide in a sprayable and coatable format for general surface use. The microcapsules will release the germicide in response to temperature from touch, pH and humidity from saliva and sneezing. Besides controlling the germicide release for release-killing, the coating will be designed for contact-killing and anti-adhesion to achieve multi-level antimicrobial activity. The technology has broad application in households and hospitals, commercial and public spaces, public transportation, agriculture and manufacturing where sanitation is paramount. The social impact of the project is considerable because of its contribution to improving Hong Kongs health and sanitation.

 

Deliverables:

 

1.      A multi-level antimicrobial coating for general surface use that is safe (i.e., non-allergic), environmentally benign and cost-effective by using USEPA and USFDA approved germicides at recommended dosage

  

2.      An antimicrobial coating based on controlled release of germicides encapsulated within smart polymers in response to contamination by touch and infectious droplets

  

3.      A micro-encapsulating technology using a micromixer to control capsule size, volume and composition

 

4.      An antimicrobial coating formulation with a shelf-life of at least 6 months

 

5.      An antimicrobial coating that achieves at least 99% reduction of viable bacteria within 30 min contact of the surface that can last for at least 30 days under normal use

 

6.      An antimicrobial coating that prevents microbial adhesion (i.e., < 20%)

 

7.      An antimicrobial coating that tolerates dirt and fouling

 

8.      A prototype coating applicator for domestic and industrial use