کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1789082 1023490 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Bactericidal effects of Ag nanoparticles immobilized on surface of SiO2 thin film with high concentration
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Bactericidal effects of Ag nanoparticles immobilized on surface of SiO2 thin film with high concentration
چکیده انگلیسی
Bactericidal activity of high concentration Ag nanoparticles immobilized on surface of an aqueous sol-gel silica thin film was investigated against Escherichia coli and Staphylococcus aureus bacteria. Size of the surface nanoparticles was estimated in the range of 35-80 nm by using atomic force microscopy. Due to accumulation of the silver nanoparticles at near the surface (at depth of 6 nm and about 40 times greater than the silver concentration in the sol), the synthesized Ag-SiO2 thin film (with area of 10 mm2) presented strong antibacterial activities against E. coli and S. aureus bacteria with relative rate of reduction of the viable bacteria of 1.05 and 0.73 h−1 for initial concentration of about 105 cfu/ml, respectively. In addition, the dominant mechanism of silver release in long times was determined based on water diffusion in surface pores of the silica film, unlike the usual diffusion of water on the surface of silver-based bulk materials. Therefore, the Ag nanoparticles embedded near the surface of the SiO2 thin film can be utilized in various antibacterial applications with a strong and long life activity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Current Applied Physics - Volume 9, Issue 6, November 2009, Pages 1381-1385
نویسندگان
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