The upper flocculation zone corresponds to the flocculation of a positive sol, the lower to that of a negative sol. All those cases in which complete flocculation occurred when 2 cc. of electrolyte was added to 2 cc. of sol and allowed to stand for four hours are listed as the "Complete" flocculation zone under the column headed "Flocculation." All other cases in which complete flocculation occurred or which showed turbidity at the end of seventy-two hours are placed in the "Partial" flocculation zone."No flocculation" corresponds to the samples in which no turbidity was manifest at the end of seventy-two hours.A comparison of the properties of this sol is being made with the properties of a sol that has been recharged with potassium ferrocyanide. The effect of H+ ion concentration on an irregular series for colloidal ferric oxide is being studied using potassium ferrocyanide as the recharging agent. Summary 1.Negative colloidal hydrous ferric oxide has been prepared by hydrolysis of a suspension of Prussian blue.2. Some of the properties of the sol have been studied.
The volatility of plutonium dioxide has been measured in the temperature range 1320°C to 1790°C by a modification of the Knudsen effusion method. The plutonium dioxide was heated in vacuum in a tantalum oven. Under these conditions the dioxide was reduced to a lower oxide, or oxides, which maintained a constant reproducible vapor pressure throughout further heating. Either an oxide was formed which was stable under the conditions of the experiment or thermal reduction continued with the formation of a second solid or liquid phase. The thermal reduction of the oxide was reversed by heating the reduced oxide in a low pressure atmosphere of oxygen.
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