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Enhanced antimicrobial activity of silver/polyrhodanine composite decorated silica nanoparticle : 은/폴리로다닌 복합체를 함유한 실리카 나노입자의 항균 증진 효과
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- Authors
- Advisor
- 장정식
- Major
- 공과대학 화학생물공학부(에너지환경 화학융합기술전공)
- Issue Date
- 2013-02
- Publisher
- 서울대학교 대학원
- Keywords
- silver nanoparticle ; polyrhodanine ; nanocomposite ; oxidation polymerization ; bactericidal
- Description
- 학위논문 (석사)-- 서울대학교 대학원 : 화학생물공학부, 2013. 2. 장정식.
- Abstract
- This work describes the novel solution system synthesis of silver/polyrhodanine composite decorated silica NPs. Polymerization of polyrhodanine proceeded preferentially on the surface of the silica NPs where the Ag+ ion was located. During the polymerization, the embedded Ag+ ions reduced to metallic Ag NPs and consequentially silver/polyrhodanine composite NPs (ca. 7 nm) were formed on the surface of the silica nanoparticle. The existence of silver NPs and polyrhodanine on the silica NPs were verified through microscopic observation, FTIR, UV-vis, and XRS analysis. The composite nanoparticle decorated silica NPs exhibited excellent antimicrobial activities against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus. Importantly, the synthesized composite NPs retained antimicrobial activity under silver depletion condition due to the contact-active biocidal polyrhodanine. Therefore, it can be anticipated that the silver/polyrhodanine composite decorated silica NPs have potential for use as a long-term antimicrobial agent.
- Language
- English
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