| 摘要 |
PURPOSE:To increase the collected quantity per unit time and to increase remarkably the production efficiency of ultrafine particles by feeding a gas into the molten bath of substance which is the material of the ultrafine particles, accelerating the evaporation of the above-mentioned substance and cooling this vapor. CONSTITUTION:The material of ultrafine particles is packed into a crucible 2 and a vessel 1 is kept airtight and exhausted till 10<-5>Torr through a conduit 13 to remove an activated gas such as oxygen therefrom. Then, electricity is conducted to a heating means 3 stuck tightly to the crucible 2 and the sample is melted while supervising the temp. of the sample with a thermocouple and kept at the fixed temp. An inert gas or the like is fed to a gas distributor 22 of the crucible through a conduit 23 to accelerate the evaporation of the sample. The evaporated gaseous material contacts the atmosphere cooled by a collector 4, is solidified into the ultrafine particles having several ten - several hundred Angstrom diameter and stuck on the inside wall of copper cylinder 43 of the collector 4. Thereby, nearly 100% of the evaporated material is recovered by the collector 4. |
