Abstract
Self-assembly processes in aqueous solutions of l-cysteine and silver nitrite (AgNO2) with different concentrations and varying molar ratios of the starting components were studied using UV spectroscopy, elemental analysis, scanning and transmission electron microscopy. The concentration range of hydrogelation was determined. Gel formation was not observed in aqueous solutions of l-cysteine—AgNO2 (cysteine-silver solution, CSS) with a concentration of the dispersed phase equal to 0.001 mol L−1. Stable yellow or brown hydrogels containing silver nanoparticles (Ag NPs) with various sizes formed at concentrations of the dissolved components equal to 0.01 mol L−1 and higher. At a CSS concentration of 0.05 mol L−1, the hydrogel became colorless, and a dark brown precipitate containing Ag NPs and silver microparticles formed within it. A single-stage model of gelation in CSSs with the simultaneous formation of Ag NPs was proposed.
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This work was financially supported by the Russian Science Foundation (Project No. 21-73-00134) using the equipment of the Center for Collective Use of Tver State University.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2123–2129, October, 2022.
The authors are grateful to S. S. Abramchuk (Lomonosov Moscow State University) for the TEM images and electron diffraction patterns of the samples.
No human or animal subjects were used in this research.
The authors declare no competing interests.
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Potapenkova, T.V., Vishnevetskii, D.V., Ivanova, A.I. et al. Effect of dispersed phase concentration on gelation and formation of silver nanoparticles in aqueous solutions of l-cysteine and silver nitrite. Russ Chem Bull 71, 2123–2129 (2022). https://doi.org/10.1007/s11172-022-3636-6
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DOI: https://doi.org/10.1007/s11172-022-3636-6