Vacuum Deposition of Aminoanthraquinone Compounds on Quartz


THE technique of vacuum deposition is eminently suitable for the formation of thin films of metals and metallic oxides upon solid surfaces. The cleanliness of the surface is of much importance in the preparation of satisfactory films, but otherwise the nature of the surface is not wholly significant and such surfaces as textiles and paper have been successfully coated. We have recently been interested in the application of this technique in the preparation of transparent dye films on thin quartz plates, with the view inter alia of comparing the absorption spectra of such solid films with those of dyed films obtained by the coloration from alcohol solution of transparent films of cellulose acetate (deplasticized, British Celanese) and nylon (no plasticizer, hexamethylene diamineadipic acid, Du Pont de Nemours). Some of our results obtained with aminoanthraquinone compounds, purified by recrystallization from ethyl alcohol six times, are of interest. Before deposition the quartz plates were cleaned by boiling in soap solution, standing in chromic acid for 24 hr., and boiling in concentrated hydrochloric acid for 1 hr., with intermediate and final washing treatments; they were then dried in a vacuum oven at 80° C.

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EGERTON, G., ROACH, A. Vacuum Deposition of Aminoanthraquinone Compounds on Quartz. Nature 179, 491–492 (1957).

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