Question

In hydrothermal method, the bomb connected directly to an independent pressure source is known as____________

(a) Hot seal

(b) Bomb

(c) Flux

(d) Cold seal

The question was asked in an online interview.

The question is from High Pressure and Hydrothermal Methods topic in section Preparative Methods of Solid State Chemistry

Answer 1

The correct option is (d) Cold seal

To elaborate: In hydrothermal method the bomb may be connected directly to an independent pressure source, such as a hydraulic ram, this is known as the ‘cold seal’ method. The reaction mixture and an appropriate amount of water are placed inside the bomb which is then sealed and placed inside an oven at the required temperature.