Abstract
A WHITISH gelatinous precipitate is formed when a hydrophilic alkaline polyalkylacrylate solution of common formula: where R = CH3, C2H5, etc., Me = sodium, potassium or other alkaline elements, is added to a silver nitrate solution. This precipitate is dissolved slowly in a polymer excess to a probably complex silver salt solution. A freshly prepared precipitate is white; in light it quickly becomes lemon coloured and the complex solution which is formed becomes orange coloured. After a longer time in diffused daylight it turns into deep red and after some days it changes into dark violet. Various colours of the solution indicate that a photochemical decomposition occurs which is accompanied by the formation of colloidal silver at various degrees of dispersity. Direct sunlight and ultra-violet rays accelerate many times the photochemical decomposition of the high polymer silver compounds to silver sols, the most effective radiation being in the range of 450–300 mµ.
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KUBAL, J. Photochemical Reaction of High-Molecular Silver Compounds. Nature 193, 1175 (1962). https://doi.org/10.1038/1931175a0
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DOI: https://doi.org/10.1038/1931175a0
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