Abstract
THE surface of filter paper, in contact with water, has a slight negative charge1, and this may account for the non-adsorption of certain colloidal electrolytes such as dyes of the ‘acid’ type, when developed with water, as these also carry a net negative charge in aqueous solution. By the application of principles similar to those described by Weiss2, a ‘primary adsorbate’ may be applied to paper, in this case being so arranged that the paper now has a net positive charge in contact with water. A suitable compound for this purpose is cetyl trimethyl ammonium bromide, the paper being soaked in 0.03 per cent aqueous solution and dried before use.
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References
Hauser, E. A., and Lynn, J. E., “Experiments in Colloid Chemistry”, 42 (McGraw-Hill Book Co., 1940).
Weiss, D. E., Nature, 162, 372 (1948).
Rutter, L., Nature, 161, 435 (1948).
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RUTTER, L. Treatment of Paper for Chromatography of some Colloidal Electrolytes. Nature 166, 273 (1950). https://doi.org/10.1038/166273a0
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DOI: https://doi.org/10.1038/166273a0
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