Atomization
Micro/Nano Encapsulation

image: An SwRI-developed spinning disk provides spherical particles with uniform coating and narrow particle size distributions.

An SwRI-developed spinning disk provides spherical particles with uniform coating and narrow particle size distributions.  High-speed video 1 | High-speed video 2

 

image: cGMP pilot-scale facilities are available for sample preparation. Custom encapsulation equipment is often fabricated to meet unique client demands.

cGMP pilot-scale facilities are available for
sample preparation. Custom encapsulation
equipment is often fabricated to meet unique
client demands.

 

image: SwRI scientists used a spray-chilling process to prepare these microspheres.

SwRI scientists used a spray-chilling process to prepare these microspheres.

Several atomization processes are used by Southwest Research Institute (SwRI) staff to solve product performance requirements. Atomization processes include:

  • Spinning disk
  • Spray drying
  • Spray chilling/congealing

Spinning Disk

Spinning disk is a highly versatile encapsulation process used to prepare matrix morphology and overcoated particles. SwRI staff have innovated the disk process to yield narrow particle size distributions, produce micron-sized particles, and process batch sizes down to a few grams with high recovery efficiency.

Spinning Disk Applications

  • Hot melts, prilling, and congealing
  • Solvent evaporation
  • Water evaporation
  • High-solids and high-viscosity feedstocks

Spinning Disk Characteristics

  • Particle sizes from 5 µm to 3,000 µm
  • Narrow particle size distributions
  • Feedstock versatility
  • Scalability and high production capacity
  • High recovery efficiency
  • Continuous production

Spray Drying

Spray drying is a traditional atomization process suitable for many feedstocks. Atomization is achieved by nozzle or veined wheels, two-fluid spray nozzles, pressure nozzles, or sonic energy.

Spray Drying Applications

  • Water- or solvent-based materials
  • Temperature sensitive materials

Spray Chilling/Congealing

SwRI scientists use a spray-chilling process to prepare microspheres as shown in the images to the right.

Related Terminology

microencapsulation  •  nanoencapsulation  •  atomization  •  spinning disk  •  spray drying  •  spray congealing  •  spray chilling •  controlled release

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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 10 technical divisions.
07/31/14