首页|Ultrasmall Ag clusters in situ encapsulated into Silicalite-1 zeolite with controlled release behavior and enhanced antibacterial activity
Ultrasmall Ag clusters in situ encapsulated into Silicalite-1 zeolite with controlled release behavior and enhanced antibacterial activity
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NSTL
Elsevier
Effectively controlling the release behavior of silver bactericide to promote its antibacterial ability is highly important in the fields of chemical, biomedical and biotechnology industry. In this study, ultrasmall Ag clusters were successfully encapsulated into silicalite-1 zeolite through in situ hydrothermal approach, and the key to this success was choosing 3-mercaptopropyltriethoxysilane as ligand to facilitate Ag precursor involved into zeolite initial sol-gel system. The structure of prepared silicalite-1 zeolite encapsulation of Ag clusters (denoted as Ag@Silicalite-1) has been well defined with various characterizations and probe reactions. Benefiting from confinement effect and shape-selectivity of silicalite-1 zeolite, Ag@Silicalite-1 sample showed much better Ag+ controlled release performance than that of sample with Ag nanoparticles impregnated onto silicalite-1 zeolite (denoted as Ag/Silicalite-1). The release behavior of Ag+ in Ag@Silicalite-1 can be well described with ritger-peppas model. Taking killing Escherichia coli as an example, in comparison with Ag/Silicalite-1, Ag@Silicalite-1 sample displayed more efficient and sustainable antibacterial activity for its controlled release character.
Ag clustersSilicalite-1 zeoliteIn situ encapsulationControlled releaseAntibacterial activitySILVER ION RELEASEMETAL-CLUSTERSNANOPARTICLESCONSEQUENCESKINETICSAGENTACID
NSTL
Elsevier
