Sonochemical coating of paper by microbiocidal silver nanoparticles
Ronen Gottesman1, Sourabh Shukla, Nina Perkas
1Department of Chemistry, Kanbar Laboratory for Nanomaterials, Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 52900, Israel.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 16, 2010
Summary
This study presents a novel method for coating paper with colloidal silver using ultrasonic radiation. The resulting nanosilver-coated paper exhibits antibacterial properties, showing potential for food packaging applications.
Area of Science:
- Materials Science
- Nanotechnology
- Biotechnology
Background:
- Colloidal silver and nanosilver coatings are recognized for their antimicrobial efficacy on various substrates.
- Applications include enhancing antimicrobial properties of fabrics, plastics, and metals.
Purpose of the Study:
- To develop a simple method for coating paper with colloidal silver using ultrasonic radiation.
- To characterize the nanosilver coatings and evaluate their antibacterial activity.
Main Methods:
- Colloidal silver coating on paper via ultrasonic radiation.
- Characterization using X-ray diffraction (XRD), high-resolution scanning electron microscopy (HRSEM), and thermogravimetry (TGA).
- Focused ion beam (FIB) cross-section imaging to assess nanoparticle penetration depth.
Main Results:
- Uniform nanosilver coatings (90-150 nm thickness) achieved by controlling precursor concentration and ultrasonication time.
- Silver nanoparticles penetrated paper to a depth exceeding 1 μm, ensuring coating stability.
- Demonstrated antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus).
Conclusions:
- Ultrasonic radiation provides an effective method for creating stable, antimicrobial nanosilver coatings on paper.
- The coated paper's antibacterial properties suggest its utility in food packaging for extended shelf life.
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