Particle Design with Glatt Powder Synthesis

Glatt powder synthesis is a thermal process for processing, producing or coating powder materials. A strictly controlled pulsating and tempered gas flow ensures unique flow dynamics in the process chamber. Due to the high degree of turbulence, pulsating gas flows do not show the undesired temperature and velocity gradients that typically occur with laminar gas flows and classical thermal processes such as rotary kilns or spray towers.

A video demonstrating Glatt powder synthesis is shown here.

Spray Calcination with Glatt Pulsed Powder Synthesis

In particle design with Glatt powder synthesis, process steps such as drying, calcination and particle formation are combined in a single step.

All particles undergo the same thermal treatment in the spray calcination process as shown in the figure:

  1. Spraying a raw material solution into the gas stream produces small droplets
  2. The pulsating gas flow generates even smaller droplets through secondary droplet decay
  3. By evaporation of the solvent, solid powder particles are formed very quickly from the droplets
  4. Thermal treatment in the reactor leads to the final powder with the desired properties
Coating with Glatt Pulsed Powder Synthesis

Suspensions are sprayed during coating. The coating material is dissolved and dried onto the core material and is subsequently thermally treated, i.e. calcinated.

Glatt powder synthesis can also be used as a process for coating nanometer and micrometer -size powders. To achieve this, suspensions are used as raw materials. Coating processes in Glatt powder synthesis are carried out with the same advantages and thermodynamic conditions as in powder synthesis. The applied coating can be used as a protective layer or to introduce new functions. Through further thermal treatment in the reactor, core material and coating can also be chemically bonded to produce new materials.

The diagram shows an overview of the coating process in Glatt powder synthesis:

  1. Spraying fine droplets of a raw material suspension into the gas stream
  2. The pulsating gas flow splits these into even smaller droplets
  3. Coated powder particles are formed by evaporation of the solvent
  4. Thermal treatment locks in the desired structure and properties.

Typical fields of application are the coating of pigments to protect them from environmental influences, the coating of substrate with large surface area for use as catalysts or the synthesis of powders with specified particle sizes.

A video demonstrating Glatt powder synthesis is shown here.