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Ruthenium metal colloid was produced by the reduction of RuCl3 in ethylene glycol. The metal particles observed by TEM had uniform shape and size, less than 5 nm in diameter. The particles agglomerated easily at pH higher than 3. When the pH value of the solution was decreased to 2, the colloidal particles were dispersed well due to the increase of the surface charge.
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Miyazaki et al. (1998) studied this question.
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