Synthesis and Stabilization of Gold Nanoparticles Using Water-Soluble Synthetic and Natural Polymers
Autor: | Ivan A Klassen, Aiganym N Azhkeyeva, Gulnur S. Tatykhanova, Zhanara A Nurakhmetova |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
gold nanoparticles (AuNPs)
Polymers and Plastics Dispersity polysaccharides Infrared spectroscopy macromolecular substances Article lcsh:QD241-441 chemistry.chemical_compound lcsh:Organic chemistry one-pot and growth seeding methods PEG ratio synthetic water-soluble polymers Fourier transform infrared spectroscopy chemistry.chemical_classification Chemistry storage stability technology industry and agriculture food and beverages General Chemistry Polymer Colloidal gold gold nanorods (AuNRs) Nanorod Ethylene glycol Nuclear chemistry |
Zdroj: | Polymers, Vol 12, Iss 2625, p 2625 (2020) Polymers Volume 12 Issue 11 |
ISSN: | 2073-4360 |
Popis: | Gold nanoparticles (AuNPs) were synthesized and stabilized using the one-pot method and growth seeding, through utilization of synthetic polymers, including poly(N-vinylpyrrolidone) (PVP), poly(ethylene glycol) (PEG), and poly(vinylcaprolactame) (PVCL), as well as natural polysaccharides, including gellan, welan, pectin, and &kappa carrageenan. The absorption spectra, average hydrodynamic size, &zeta potential, and morphology of the gold nanoparticles were evaluated based on various factors, such as polymer concentration, molecular mass of polymers, temperature, and storage time. The optimal polymer concentration for stabilization of AuNPs was found to be 4.0 wt % for PVP, 0.5 wt % for gellan, and 0.2 wt % for pectin, welan, and &kappa carrageenan. The values of the &zeta potential of polymer-stabilized AuNPs show that their surfaces are negatively charged. Most of the AuNPs are polydisperse particles, though very monodisperse AuNPs were detected in the presence of a 0.5 wt % gellan solution. At a constant polymer concentration of PVP (4 wt %), the average size of the PVP&ndash AuNPs decreased with the decrease of molecular weight, and in the following order: PVP 350 kDa (~25 nm) > PVP 40 kDa (~8 nm) > PVP 10 kDa (~4 nm). The combination of Fourier-transform infrared spectroscopy (FTIR) and Raman spectroscopy revealed that the functional groups of polymers that are responsible for stabilization of AuNPs are lactam ring in PVP, carboxylic groups in gellan and welan, esterified carboxylic groups in pectin, and SO2 groups in &kappa carrageenan. Viscometric and proton nuclear magnetic resonance (1H NMR) spectroscopic measurements showed that the temperature-dependent change in the size of AuNPs, and the gradual increase of the intensity of AuNPs at 550 nm in the presence of gellan, is due to the rigid and disordered conformation of gellan that affects the stabilization of AuNPs. The AuNPs synthesized in the presence of water-soluble polymers were stable over a period of 36 days. Preliminary results on the synthesis and characterization of gold nanorods stabilized by polymers are also presented. |
Databáze: | OpenAIRE |
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