The Formation of Colloids
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The Formation of Colloids

The Formation of Colloids


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...various amounts of gold nuclei to the reduction mixture. Secondly, the degree of dispersion of gold colloids with very small (amicroscopic) particles may be determined by immersing the particles in the reduction mixture and allowing them to grow large enough for ultra-microscopic investigation. Recently Borjeson (17) has shown that a great many other kinds of small particles act as nuclei in the reduction of gold by hydrogen peroxide, viz., metals such as platinum, silver, mercury, tin, copper, bismuth, cadmium, zinc, iron, aluminium, sulphides of antimony and arsenic, sulphur. Oxides of tin, iron and silicon as well as dyes and organic colloids, e.g., gelatin and gum arabic, do not act as nuclei. When dealing with these " nuclei methods," whether it is a question of preparing a gold colloid of a certain degree of dispersion or of determining the degree of dispersion of a colloid--the particles of which are too small to be measured with the ultra-microscope--the iundamental condition is that there should be no spontaneous production of nuclei in the reduction mixture. According to Westgren the concentration of the HAuCl4 should not be less than 104 normal and the number of nuclei added not less than 5-io9 per cubic centimetre, otherwise spontaneous production of gold nuclei will take place before the reduction is completed. That under suitable conditions no spontaneous nuclei appear is demonstrated by the following table (5) given by Westgren: --Even in the case of nuclei of material other than gold the process may be carried out in such a manner that all the gold from the solution is deposited on the nuclei. A table given by Borjeson shows this. Table 6. Nuclei: Cadmium, prepared by the damped high-frequency alternating current arc in ethyl alcoho...


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Product Details
  • ISBN-13: 9781152472549
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1152472542
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 73 gr


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