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High temperature aerosol processing - PowerPoint PPT Presentation


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High temperature aerosol processing. Overview Example of TiO2 Vapor phase generators Spray pyrolysis Spray generation Jung Hyeun Kim’s presentation. Aerosol Reactors. Vapor Phase Reactors - Titania, Fumed Silica, Nitrides, etc. - Hot Wall, Flame, Plasma, Laser Ablation, Laser Pyrolysis

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Presentation Transcript
high temperature aerosol processing
High temperature aerosol processing
  • Overview
  • Example of TiO2
  • Vapor phase generators
  • Spray pyrolysis
  • Spray generation
  • Jung Hyeun Kim’s presentation
aerosol reactors
Aerosol Reactors
  • Vapor Phase Reactors - Titania, Fumed Silica, Nitrides, etc. - Hot Wall, Flame, Plasma, Laser Ablation, Laser Pyrolysis
  • Spray Pyrolysis - Ferrites, Single and Multicomponent oxides, metals and alloys - Spray Nozzles - single and two fluid, Acoustic Sprayers and Nebulizers
problem particles
Problem Particles
  • Process Effluents - Power Plant Fly Ash, Smelter Emissions, Sintering Plants
  • Contaminants - Contamination in Pharmaceutical, Semiconductor Industries (Mr. Doug Kremer on Thursday)
  • Occupational Exposure
process players
Process Players
  • Solid/gas reactors - Reactant Feeding
  • Size Classification - Powder Dispersion in Gases
  • Coatings on Surfaces - Condensation
products
PRODUCTS
  • Titania pigment, Carbon blacks, Fumed silica, Alumina etc.
  • Metals and alloys - Ni, Ag, Au, Pd - electronics circuits
  • Multicomponent Oxides - Ferrites, Superconductors,Dielectrics
  • Nanoscale Materials
vapor phase reactors
Vapor Phase Reactors
  • Precursor is in vapor phase
  • Chemical reaction to condensable species or condensation of vapor happens to make products (can have combination of both)
  • Chemically reactive environment can be: flame, plasma, thermal with resistive heating, thermal via laser etc…
  • Condensation induced by mixing, expansion (big pressure gradients!) or both
titania process
Titania Process

Oxygen

Agglomerates

Flame

Fabric Filter

Fuel

Molecular Clusters

Thermophoresis - Wall Deposits

TiCl4

Product

titania process9
Titania Process
  • Nucleation - Particle Formation
  • Coagulation and Aggregate Formation
  • Thermophoresis and Wall Losses
  • Solid/Gas Separation - Fabric Filter(Bag House Collectors)
spray pyrolysis
Spray Pyrolysis
  • Very common method for making particles
  • Here precursor starts as droplets or solid particles
  • Thermal, plasma, flame also used as reaction environment but reaction is in liquid or solid phase (tiny microreactors!)
  • Mr. JH Kim will discuss this…
droplet drying and conversion
Droplet Drying and Conversion
  • Drying and conversion rates affect morphology of the particles
  • Can have hollow particles or can shatter particles
  • Mr. Kim will talk about effect of solvent on chemistry of particles
  • How to make spray? Some examples…
slide13

Video Images of Drying Droplet

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Time: 188 sec

condensation aerosol generator
Condensation Aerosol Generator

Gas

Condenser

Vaporizer

Heater

nebulizer
Nebulizer

Aerosol

Impaction Target

nebulizer condensation generator
Nebulizer/Condensation Generator

Aerosol

Condenser

Evaporator

Nebulizer