Synthesis of Engineered Particulates Using Dry Particle Coating

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Synthesis of Engineered Particulates Using Dry
Particle Coating

• By Nick van Nispen

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Engineered Particulates

• Powder materials designed to have specific
  properties are called Engineered or Designed
  Particulates
• Three Types
• Coated particles (discrete and film coatings
• Designer particles having a specific size, shape
  or morphology
• Composite particles (nano-composites, granulated
  particles)
• Our research focuses on the formation/synthesis
  of coated particles using new and innovative
  techniques

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Engineered Particulates

• The coating of individual particles with other,
  smaller particles is commonly carried out to
  improve the characteristics of particles
• Wet Particle Coating
• Dry Particle Coating

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Applications

• Nanoparticulates are widely used in industry
• Cosmetics
• Dyestuff
• Toner
• Pharmaceuticals
• Food
• Ceramics
• Powder
• Biochemical
• Electromaterials
• Fertilizer

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Applications

• Particle Coating can change the properties of
  target particles
• Flowability
• Dispersibility
• Wettability
• Coloring
• Falvor
• Hydrophilic/Hydrophobic Properties
• Electristatic/Electric/Magnetic/Optical
  Characteristics
• Particle Size Distribution
• Shape/Sphericity
• Solid Phase Reactivity

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Wet Particle Coating

• Currently Industrial Standard for nanoparticle
  coating
• Drawbacks
• WPC solution may be volatile and toxic
• Requires post treatment and waste processing ?
  increases cost

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Dry Particle Coating

• Advantages to WPC
• new particles may have completely different
  functionality or much improved properties
• much reduced use of high-priced or rare materials
  
• Process is environmentally clean
• Water soluble powders can now be coated without
  compromising the sample

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Dry Particle Coating
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Dry Particle Coating

• Dry Particle Coating Equipment
• Mechanofusion
• Hybridizer
• Magnetic Assisted Impactation Coating

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Mechanofusion
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Hybridizer
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MAIC
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Examples
Cornstarch
CS coated with TiO2
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Examples
Surface Morphology of Cellulose/TiO2 at different
processing times
Processing Time 5 Mins
Processing Time 10 Mins
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Examples
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Current Research at NJIT

• Coating Particles using various coating
  techniques to create host/guest blends
• Cornstarch/TiO2
• Pure Al/R972
• After Processing, nanoparticulates are processed
  again together to discover if guest particle
  exchange still occurs after coating
• To be analzyed using EDX and SEM imaging