Resource Efficient Innovations Database (REID)

New process for coating paper with anti-microbial silver nanoparticles

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New process for coating paper with anti-microbial silver nanoparticles
A simple one-step process for coating paper with anti-microbial colloidal silver nanoparticles which could be scaled up to meet industrial requirements.
In Development – Ongoing R and D work.

Benefits
Product Waste Reduction, Shelf life extension

Product Categories
Food

Relevant Materials
Cartonboard, Coatings/Inks, Paper

Relevant Packaging Formats
Cartons, Sacks

Supply Chain Phase
Storage

Details

A research team from Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, has developed a one-step process using ultrasonic radiation for coating paper with antimicrobial colloidal silver nanoparticles.
 
The process involves the in-situ generation of nanoparticles and their simultaneous application onto the paper substrate. The research team claims it is able to control both the thickness of the coating and particle size by varying precursor concentrations and reaction times. The nanomaterials were attached to the paper by a process of ultrasonication. The silver nanoparticles are anchored strongly to the surface either by physically embedding them into the surface or by forming chemical bonds or other interactions with the substrate.  The subsequent coatings are highly stable. Loss of silver from the surface is minimal, which is essental  for long-life applications.

Tests by the researchers demonstrate that the coated paper has a potent antibacterial effect against foodborne disease-causing organisms such as E. coli and S. aureus, killing all of the bacteria in just three hours. 
 
As well as being effective, the researchers believe that the process would be easily scaled up to meet industrial-scale requirements.

Potential Benefits

Effective anti-microbial coatings can help extend product shelf-life and reduce product waste through deterioration in the supply chain and in the home.

Intellectual Property

The research work is published in the publication:
Langmuir 2011, 27 (2), pp 720–726; DOI: 10.1021/la103401z ; Publication Date (Web): December 14, 2010
"Sonchemical Coating of Paper by Microbiocidal Silver Nanoparticles" by Ronen Gottesman, Sourabh Shukla, Nina Perkas, Leonid A. Solovyov, Yeshayahu Nitzan, and Aharon Gedanken.

Consultant View

This type of technology has considerable potential to extend shelf-life and thereby reduce food waste in the supply chain and home. However, the use of nanotechnology solutions in packaging is potentially controversial. Ongoing work is required to clarify the suitability of these materials for food contact applications in order to gain consumer confidence and acceptance.

Contacts and Further Information

Company details:
Institute of Nanotechnology and Advanced Materials
Bar-Ilan University
Israel
 
Technology contact details:
Prof. Aharon Gedanken ( Materials, Chemistry)
Department of Chemistry, Kanbar Laboratory for Nanomaterials
Tel: 03-5318315
Email: gedanken@mail.biu.ac.il

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