Preparation and high bacteriostatic action of the activated carbons possessing ultrafine silver particles

✍ Scribed by Seiichi Miyanaga; Akio Hiwara; Hajime Yasuda

• Publisher: Institute of Physics and National Institute of Materials Science
• Year: 2002
• Tongue: English
• Weight: 222 KB
• Volume: 3
• Category: Article
• ISSN: 1468-6996
• DOI: 10.1016/s1468-6996(02)00014-1

✦ Synopsis

The new carbon composites possessing ultra®ne silver particles (0.001 wt%, size 1.8±2.5 nm) show high bacteriostatic action toward bacteria such as Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus subtilis and a yeast fungus like Candida albicans. The present carbon composite was prepared by the steam activation of a mixture of a petroleum pitch and N,N-dimethylaminomethylphenylsilver (0.012 mg/g) at 930 8C for 15±19 min. The growth inhibitory effect for Gram-negative bacteria such as E. coli and P. aeruginosa varies greatly depending on the amount of ultra®ne silver particles, while the Gram-positive bacteria show little effect by the amount of silver particles used. A yeast fungus like C. albicans exhibits relatively small biostatic action as compared with bacteria, but it shows enough activity when we used the carbon material possessing 0.01 wt% of Ag particles.