![]() ![]() To ensure that the desired crystal form precipitates, a seed of a-FeO(OH) is added. The reaction is sustained by addition of iron metal which reacts with the sulfuric acid formed, regenerating Fe(n) in solution. The final one is to nucleate particles heterogeneously only on the support surfaces, not homogeneously independently from the surfaces, as shown in Figure 4. As a result, nearly all polymerization takes place in the particles and the polymer concentration in the diluent phase is low. This critical molecular weight increases with the solubility of the polymer and is low enough so that all the oligomers are captured or nucleate particles before their radicals are terminated. It is, therefore, necessary to make a subtraction from this equation to allow for interface removal resulting from the consumption of first-nucleated particles. ![]() This equation ceases to be applicable when t, > c/2kG since nuclei generated at t = 0 will then have penetrated the reactant particle. The hydroxide is then oxidized to the seeds of hydrated ferric oxide. The reaction is carried out at alow temperature using an excess of ferrous ions. The Penniman-Zoph process involves the preparation of seeds or nucleating particles by the alkaU precipitation of ferrous sulfate. ![]()
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