“Pure” silver hydrosol: nanoparticles and stabilizing carbonate ions
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A method for the preparation of a pure colloidal solution of silver (silver hydrosol) containing only small metal nanoparticles and carbonate ions stabilizing them was developed. For this purpose, a solution containing silver and oxalic acid salts was exposed to UV radiation of a low-pressure pulsed xenon lamp. The irradiation initiated Ag+ reduction with oxalate ions to give metal nanoparticles and carbonate ions. The latter ensure the electrostatic protection of nanoparticles via the formation of an electric double layer. Variation of the process conditions (silver and oxalate concentrations, UV irradiation conditions, the presence of air, and so on) allows the preparation of silver hydrosols with nanoparticle size ranging from 5 to 30 nm. The hydrosol is aggregatively stable for several months.
KeywordsColloidal solution Silver Nanoparticles Oxalate ions Photochemical synthesis Carbonate ions
We sincerely thank A.A. Timofeev for carrying out the TEM analysis of the nanoparticles and valuable discussions.
The study was supported by the Ministry of Science and Higher Education of the Russian Federation (project no. АААА-А16-116121410087-6).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Chatterjee K, Banerjee S, Chakravorty D (2002) Plasmon resonance shifts in oxide-coated silver nanoparticles. Phys Rev B 66(085421). https://doi.org/10.1103/PhysRevB.66.085421
- Erämetsä O, Parpola TM (1942) Direkte titrimetrische Bestimmung der Oxalsäure in Gegenwart anderer organischer Säuren. Suomkn Kern 15B:12–15Google Scholar
- Luoma SN (2008) Silver nanotechnologies and the environment: old problems or new challenges? Woodrow Wilson International Center for Schlars, Washington, DCGoogle Scholar
- Troupis A, Hiskia A, Papaconstantinou E (2002) Synthesis of metal nanoparticles by using polyoxometalates as photocatalysts and stabilizers. Angew Chem Int Ed 41:1911–1914. https://doi.org/10.1002/1521-3773(20020603)41:11<1911::AID-ANIE1911>3.0.CO;2-0 CrossRefGoogle Scholar