caa a22 4500 605489300 CHVBK 20210128100459.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1134/S1061933X15060174 doi (NATIONALLICENCE)springer-10.1134/S1061933X15060174 Formation of copper(I) oxide nanoparticles at an early stage of copper sol synthesis in the presence of poly(vinylpyrrolidone) [Elektronische Daten] [I. Papisov, I. Isaeva, G. Ostaeva, E. Eliseeva, A. Papisova, V. Kozlovskii] The initial stage of the reduction of Cu2+ ions with tert-butylamine borane in aqueous poly(N-vinylpyrrolidone) solutions has been investigated by electronic spectroscopy, X-ray diffraction analysis, transmission electron microscopy, and measurements of pH. It has been shown that a yellow-orange sol of Cu2O with nanoparticle sizes of 2-10 nm is formed at this stage, which is accompanied by a significant decrease in the pH of the reaction system. With a lack of a reducing agent, Cu2O sols remain transparent for 24 h or more, thereby indicating an interaction between oxide nanoparticles and polymer macromolecules. In the presence of excess reducing agent, the formation of a copper metal sol begins after Cu2+ ions have been exhausted. The introduction of an additional portion of Cu2+ ions into the reaction system at this stage leads to the oxidation of copper nanoparticles with the formation of Cu2O particles. Based on the data obtained, it has been concluded that the oxidation of copper metal particles with Cu2+ ions to the univalent state hinders the formation of the copper sol at the initial stage of the reduction. Thus, in the investigated system, Cu2O nanoparticles play the role of a precursor for copper metal particles. Pleiades Publishing, Ltd., 2015 Papisov I. Moscow State Automobile and Road Technical University (MADI), Leningradskii pr. 64, 125319, Moscow, Russia aut Isaeva I. Moscow State Automobile and Road Technical University (MADI), Leningradskii pr. 64, 125319, Moscow, Russia aut Ostaeva G. Moscow State Automobile and Road Technical University (MADI), Leningradskii pr. 64, 125319, Moscow, Russia aut Eliseeva E. Moscow State Automobile and Road Technical University (MADI), Leningradskii pr. 64, 125319, Moscow, Russia aut Papisova A. Moscow State Automobile and Road Technical University (MADI), Leningradskii pr. 64, 125319, Moscow, Russia aut Kozlovskii V. Department of Chemistry, Moscow State University, 119991, Moscow, Russia aut Colloid Journal Pleiades Publishing 77/6(2015-11-01), 780-786 1061-933X 77:6<780 2015 77 10595 https://doi.org/10.1134/S1061933X15060174 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061933X15060174 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Papisov I. Moscow State Automobile and Road Technical University (MADI), Leningradskii pr. 64, 125319, Moscow, Russia aut NATIONALLICENCE 700 1- Isaeva I. Moscow State Automobile and Road Technical University (MADI), Leningradskii pr. 64, 125319, Moscow, Russia aut NATIONALLICENCE 700 1- Ostaeva G. Moscow State Automobile and Road Technical University (MADI), Leningradskii pr. 64, 125319, Moscow, Russia aut NATIONALLICENCE 700 1- Eliseeva E. Moscow State Automobile and Road Technical University (MADI), Leningradskii pr. 64, 125319, Moscow, Russia aut NATIONALLICENCE 700 1- Papisova A. Moscow State Automobile and Road Technical University (MADI), Leningradskii pr. 64, 125319, Moscow, Russia aut NATIONALLICENCE 700 1- Kozlovskii V. Department of Chemistry, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Colloid Journal Pleiades Publishing 77/6(2015-11-01), 780-786 1061-933X 77:6<780 2015 77 10595