Silver nanoparticles are well known as novel materials as metal electrodes on ceramics, catalyst, antibacterial agent, and etc. The assisted role of polymeric ceramic dispersant on synthesis of highly concentrated silver nanoparticles was studied. The used ceramic dispersants with different kinds of counter ion of polyelectrolyte were polymethylmetacrylic ammonium salt (PMMA, i.e., Darvan C: R.T. Vanderbilt Co.), polyacrylic ammonium salt (PAA), polyacrylic amine salt (PAAm), and polyacrylic sodium salt (PAS). The formation of Ag(0) nanoparticles was followed by UV spectrometer, XRD and TEM. According to TEM investigations Ag(0) nanoparticles with the rage of 10 ~ 20 nm in diameter were produced. The possible concentration of batch -synthesized silver nanoparticles was up to 10 wt%.
This work describes a strategy of assembling horizontally oriented Ag nanoplates (AgNPTs) with PSS-Ag as the precursor of silver by the layer-by-layer (LbL) technique on planar substrates. These AgNPTs have a lateral dimension of 20-80 nm and a thickness of 9-12 nm. A corresponding formation mechanism of these AgNPTs is discussed considering the orientation of the polyelectrolytes molecules, as well as their confinement effect on the diffusion of Ag nanoparticles. The exposed horizontal surfaces of the AgNPTs correspond to low free energy; they show an active antimicrobial activity. No Staphylococcus aureus colonies appear on the nutrient agar medium inoculated and incubated with S. aureus solutions treated by LbL films containing AgNPTs. The horizontally oriented AgNPTs by the described strategy in this work not only provides a novel method for controlled assembly of AgNPTs, but also provides insight in the antimicrobial behavior of nanoplate surfaces with low free energy.
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