Method and apparatus for preparing boron nitride nanotubes by heat treating boron precursor prepared by using air-jet

An apparatus for preparing boron nitride nanotubes (BNNTs), the apparatus comprising:

• a container comprising a round nano-sizing area in which a first powder generated by mixing boron powder with a catalyst powder, is nano-sized to form a second powder;
• a first inlet through which the first powder is introduced into the nano-sizing area;
• a second inlet through which a first air is introduced to the nano-sizing area;
• and
• an outlet through which a second air having the second powder is discharged from the nano-sizing area;
• a first air injector connected to the second inlet and allowing the first air to be introduced into the nano-sizing area therethrough;
• and
• a collector connected to the outlet and including a membrane which collects the second power by allowing the second air to pass therethrough;
• wherein the second inlet is installed in a direction inclined to a perpendicular direction of the container;
• and
• wherein the first inlet is formed to form an acute angle towards a flow direction of the first air.