Abstract
THESE two volumes are put forward in proof of the author's main thesis “that colloid-amorphous properties appear in bodies as their comminution increases, and that such comminution is possible in all bodies.” The well-executed atlas of plates reproduces photographs of crystallisation processes in various concentrations, chiefly of barium sulphate and aluminium hydroxide. It is shown that the size of the crystals is strongly influenced either way by the concentration. Examined in the ultra-microscope, jellies and transparent colloid structures generally show minute particles which are essentially crystalline, differing from crystals only in their size. Any solid, sufficiently comminuted, might be made into a “solid mist” of particles showing Brownian motions, but the latter are just what leads as a rule to crystalline agglomeration. By comminuting aniline-blue into a neutral substance (urea), Pihlblad obtained colloid solutions of the former in water of any degree of fineness. The author, in view of these facts, proposes to substitute the term dispersoid for the less significant term “colloid”, and would call the science of colloids “dispersoidology.”
Zur Lehre von den Zustnden der Materie.
By Prof. P. P. von Weimarn. Band 1.: Text. Pp. x + 190. Band 11.: Atlas. Tafeln lii. 2 Vols. (Dresden and Leipzig: T. Steinkopif, 1914.) Price 7 marks.
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Zur Lehre von den Zuständen der Materie . Nature 94, 145 (1914). https://doi.org/10.1038/094145a0
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DOI: https://doi.org/10.1038/094145a0