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论文类型：期刊论文

发表时间：2014-03-01

发表刊物：CERAMICS INTERNATIONAL

收录刊物：SCIE、EI、Scopus

卷号：40

期号：2

页面范围：3693-3698

ISSN号：0272-8842

关键字：SiO2; Silver clusters; Antimicrobial activity

摘要：Silica nanospheres encapsulating silver nanoclusters (denoted as Ag-SiO2) have been synthesized via a one-pot microemulsion method and their antibacterial activities have been investigated in detail. ICP-AES analysis indicated that the silver ions were continually released from the silica spheres in aqueous solution. The antibacterial properties of Ag-SiO2 against both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus were evaluated using minimum inhibitory concentration (MIC), minimal bactericidal concentration (MBC), and the modified Kirby Bauer method. The results show that the Ag-SiO2 exhibits excellent and durable antimicrobial activities. The growth of both Gram-negative E. coli and Gram-positive S. aureus was completely inhibited during 48 h culture period. Moreover, the tested silver nanoclusters show higher activity against bacteria than the silver nanoparticles. This newly designed Ag-SiO2 may offer a rapid and constant antimicrobial solution for practical applications. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.