Triethylamine induced synthesis of silver and bimetallic (Ag/Au) nanoparticles in glycerol and their antibacterial study

Abstract

Formation of Ag nanoplates in the presence of glycerol/triethylamine/polyvinylpyrrolidone without using any external reducing agent is shown for the first time. This approach is a unique and size-controlled synthetic method for the preparation of Ag nanoplates. Results reveal that addition of triethylamine to the precursor reaction mixture plays an important role both as a reagent for initiation and accelerator to produce nanoparticles at room temperature in the presence of glycerol. The basicity of the reaction mixture results in the appearance of two strongly localized surface plasmon resonance peaks of Ag nanoplates, effectively indicating the steady transition from non-planar structure to planar structure as confirmed by UV-Vis and transmission electron microscope measurements. The antibacterial activity of Ag and bimetallic (Ag/Au) nanoparticles were tested against gram-negative and grampositive bacteria. The enhanced antibacterial activity was observed with bimetallic nanoparticles with equal concentration of silver.

Self-Crosslinked Ellipsoidal Poly(Tannic Acid) Particles for Bio-Medical Applications

“…Then, this solution was transferred into 50 mL cyclohexane in 100 mL flask. Additionally, then, 0.5 mL aqueous solutions of sodium periodate (NaIO 4 ), e.g., 50, 100, and 200 mole% based on TA amount was added in the solution followed by the addition of 10 µL triethylamine (TEA), an accelerator for the reaction by acting as proton acceptor [ 43 , 44 ] and mixed with homogenizer (IKA, T25 digital ULTRA TURRAX) at 5000 rpm at 60 °C for 45 min. After that, the obtained p (TA) particles were precipitated by using a centrifuge (BECKMAN COULTER, Allegra 64R Centrifuge) at 10,000 rpm for 10 min.…”

Electrochemical aspects of coinage metal nanoparticles for catalysis and spectroscopy

“…It was observed that Au@Ag core–shell nanoparticles exhibited enhanced antibacterial activity because of the Ag shell around the Au core. 82 …”

Metal-based nanoparticles dispersed in glycerol: An efficient approach for catalysis

“…Ag, Au and Au@Ag core shell NPs were prepared by dissolving AgNO 3 or HAuCl 4 salt in aqueous solution with (0-40%vol) glycerol with triethylamine as reducing agent in the presence of PVP or SDS (sodium dodecyl sulfate) as stabilizing agents at room temperature. For the bimetallic system, AuNPs were firstly prepared and after AgNO 3 was added with triethylamine and glycerol [54].…”