Laboratory Manual of Colloid Chemistry
Laboratory Manual of Colloid Chemistry
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In our eReader you can find the full English version of the book. Read Laboratory Manual of Colloid Chemistry Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Laboratory Manual of Colloid Chemistry
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Exp. 111. Chromatic Emulsions (Holmes and Cameron, Jour. Am. Chem. Soc. 44, 71, 1922). Shake 4 volumes of gjycerol with 4 volumes of a 2-3 per cent "solution " of dry cellulose nitrate (11 per cent nitrogen) in amyl acetate. Add 10 volumes of benzene with shaking; then more glycerol, until rather viscous; then still more benzene in small additions, shaking, until color appears. The whole " chromatic, " scale of colors may be secured by the addi- tion of increasing amounts of benzene. The colors... reappear in reverse order on the addition of more amyl acetate. Temperature changes change the colors. Such an emulsion is viewed best if a 125 cc. Oil specimen bottle is used as a container and held some distance from the source of light. A single source is best, as one window in a room or a single strong light at night. On long standing these emulsions " cream " downwards, although vigorous shaking restores much of their beauty. The cream often sets to a real jelly.
To secure such structural color emulsions it is necessary to have two mutually soluble liquids for the continuous phase, one of them of high refrac- tive index and high dispersive power (as a prism disperses light).
What to read after Laboratory Manual of Colloid Chemistry?
You can find similar books in the "Read Also" column, or choose other free books by Harry N Harry Nicholls Holmes to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Exp. 111. Chromatic Emulsions (Holmes and Cameron, Jour. Am. Chem. Soc. 44, 71, 1922). Shake 4 volumes of gjycerol with 4 volumes of a 2-3 per cent "solution " of dry cellulose nitrate (11 per cent nitrogen) in amyl acetate. Add 10 volumes of benzene with shaking; then more glycerol, until rather viscous; then still more benzene in small additions, shaking, until color appears. The whole " chromatic, " scale of colors may be secured by the addi- tion of increasing amounts of benzene. The colors... reappear in reverse order on the addition of more amyl acetate. Temperature changes change the colors. Such an emulsion is viewed best if a 125 cc. Oil specimen bottle is used as a container and held some distance from the source of light. A single source is best, as one window in a room or a single strong light at night. On long standing these emulsions " cream " downwards, although vigorous shaking restores much of their beauty. The cream often sets to a real jelly.
To secure such structural color emulsions it is necessary to have two mutually soluble liquids for the continuous phase, one of them of high refrac- tive index and high dispersive power (as a prism disperses light).
What to read after Laboratory Manual of Colloid Chemistry?
You can find similar books in the "Read Also" column, or choose other free books by Harry N Harry Nicholls Holmes to read onlineMoreLess
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