Spacing-Dependent Antimicrobial Efficacy of Immobilized Silver Nanoparticles.
Silver nanoparticles (Ag NPs) with a similar mean particle diameter (∼5.0 nm) but distinguished dispersion densities were in situ fabricated and immobilized on plasma-sprayed titanium oxide coatings by a silver plasma immersion ion implantation process (Ag PIII). Experiments and theoretical predictions demonstrated that the efficacy of these Ag NPs against bacteria relies on their electron storage capability, which is the interparticle distance associated in the dark, and it is inversely dose-dependent. A particle population with a relatively large spacing distance is superior in concentrating the electrons extruded by bacterial cells, activating oxidative reactions, and disrupting the bacterial cells. The finding opens up a new window leading to active design and control of the interactions between materials and biological systems.
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Huiliang
H
Cao
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Yuqin
Y
Qiao
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Fanhao
F
Meng
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Xuanyong
X
Liu
bacteria; electron transfer; ion implantation; nonradiative processes; titanium oxide