caa a22 4500 47576059X CHVBK 20180406123549.0 cr unu---uuuuu 170329e20001001xx s 000 0 eng 10.1007/BF02496340 doi (NATIONALLICENCE)springer-10.1007/BF02496340 Ershov B. Institute of Physical Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 117915, Moscow, Russian Federation aut Aqueous solutions of colloidal nickel: Radiation-chemical preparation, absorption spectra, and properties [Elektronische Daten] [B. Ershov] Radiation-chemical reduction of Ni2+ ions in aqueous solutions of Ni(ClO4)2 containing sodium formate or isopropyl alcohol was studied, γ-Irradiation of deaerated solutions in the presence of polyethyleneimine, polyacrylate, or polyvinyl sulfate gives stable metal sols containing spherical particles 2-4 nm in diameter. The optical absorption spectra of nickel nanoparticles exhibit a band with a maximum at 215±5 nm (ε215=4.7·103 L mol−1 cm−1) and a shoulder at 350 nm. A mechanism for the radiation-chemical reduction of Ni2+ ions by hydrated electrons and organic radicals (CO2- radical anions in the case of HCOONa and Me2C·OH radicals in the case of PriOH). The redox potentials of the Ni2+/Ni0 and Ni+/Ni0 pairs (Ni0 is a nickel atom) are approximately −2.2 and −1.7 V, respectively. The nanoparticles are readily oxidized by O2, H2O2, and other oxidants. The reactions of these species with silver ions yield relatively stable nanoaggregates containing both nickel and silver in addition to silver nanoparticles. Kluwer Academic/Plenum Publishers, 2000 γ-irradiation nationallicence aqueous solutions nationallicence reduction nationallicence nickel nationallicence silver nationallicence colloids nationallicence sols nationallicence optical absorption nationallicence redox reactions nationallicence Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/10(2000-10-01), 1715-1721 1066-5285 49:10<1715 2000 49 11172 https://doi.org/10.1007/BF02496340 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02496340 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Ershov B. Institute of Physical Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 117915, Moscow, Russian Federation aut NATIONALLICENCE 773 0- Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/10(2000-10-01), 1715-1721 1066-5285 49:10<1715 2000 49 11172 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer