| 摘要 |
PURPOSE:To enhance the uniformity of Pt or Pd colloid by feeding the mixed solution of aqua regia of Pt or Pd and further hydrogen gas from another supply system and by allowing them to flow together just in front of the burning hydrogen gas to burn them. CONSTITUTION:In the material combustion container, 120ml 70% ethanol is added to 50ml aqua regia in which, for example, 10g Pt or Pd is dissolved and then all is stirred, thereafter ethanol is added to prepare about 500ml material solution to be burned. On the other hand, hydrogen is fed from a feed pipe 1 to a burner 3 to be ignited, the material solution to be burned is fed from a feed pipe 2 to the burner 3 and is allowed to flow together with hydrogen gas at the junction 4 located closely in front of the hydrogen gas flame 4 and the flame 6 is blown from an exhaust nozzle 5 into the bottom of the vortex of a liquid dispersant. The combustion temperature of Pt is regulated to 830-870 deg.C and that of Pd, 630-670 deg.C. The color of the liquid dispersant changes with the combustion and the colloid is formed.
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