S. Nemeth and C. L. Goh, "Low Temperature, Water Based Synthesis of Silver Nanoparticles with Antimicrobial Activity", 8th International Conference on Materials for Advanced Technologies (ICMAT 2015), 28-Jun-2015 to 03-Jul-2015, Singapore
Abstract:
A classical silver nanoparticle preparation method is the polyol process [1, 2] that is carried out in polyol solvents at high temperature. Other methods are also known that rely on the use of organic solvents or water as the reaction medium [3]. However there are relatively few synthesis methods with low environmental impact. Aminosilanes were previously suggested only for solvent based synthesis and in large molar excess [4-9], but they can be used in water based reaction medium too.
A new green synthesis process is described here that uses only water, silver nitrate, aminosilane [N-(2-aminoethyl)-3-aminopropyltrimethoxysilane] and reducing agent to synthesize silver nanoparticles. Silver nanoparticles were successfully prepared in high concentration (1000 ppm Ag) with diameter below 30 nm based on the analysis of UV-Vis spectra of the nanoparticle dispersions. The particle size was easily controlled by first preparing small seeds and then introducing additional complexed silver ions to deposit more silver on the initial seed particles. This led to the progressive formation of larger particles. It was confirmed that aminosilane plays a crucial role in the nanoparticle formation since its replacement by a polyamine (Jeffamine T-403) bulk silver precipitation was observed instead of nanoparticle formation. The use of aminosilane also provides amino and silanol functional groups on the nanoparticles that can promote reversible aggregation of the particles and enhance particle adhesion on surfaces. This is useful in antimicrobial treatments. Preliminary experiments indicated excellent antimicrobial activity. Thin layers of spray deposited silver nanoparticles on ceramic tiles were able to prevent bacterial growth completely.
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Funding Info:
This research was supported by Delta Intercontinental Pte Ltd. Grant number is not applicable.
Description:
The provided article is a description of the research presented at the conference. The described particle synthesis method is covered by a patent.