IN-SITU MEASUREMENT OF SUBMICRON PARTICLES DURING SYNTHESIS FROM GASEOUS PRECURSORS

Period of Performance: 01/01/1993 - 12/31/1993

$250K

Phase 2 SBIR

Recipient Firm

Advanced Fuel Research, Inc.
87 Church Street
East Hartford, CT 06108
Principal Investigator

Abstract

AEROSOL PROCESSING IS A POPULAR METHOD TO PRODUCE SUBMICRON PARTICLES FOR TECHNOLOGIES LIKE PIGMENTS AND SINTERABLE CERAMICS. ALTHOUGH THE PARTICLE SIZE DISTRIBUTION (PSD) OFTEN CONTROLS THE QUALITY OF THE FINAL PRODUCT, THIS PARAMETER CANNOT CURRENTLY BE MEASURED ON-LINE BECAUSE OF THE DENSE PARTICLE STREAMS. IN ADDITION, THE NUMBER DENSITYAND TEMPERATURE OF THE PARTICLES IN THE REACTOR ARE ALSO UNKNOWN. CONSEQUENTLY, EFFECTIVE PROCESS MONITORING AND CONTROL IS NOT READILY AVAILABLE. ADVANCED FUEL RESEARCH, INC. (AFR) HAS DEVELOPED A NOVEL FOURIER TRANSFORM INFRARED (FT-IR) EMISSION/TRANSMISSION (E/T) TECHNIQUE THAT CAN OVERCOME THE ABOVE PROBLEMS. THE TECHNIQUE USES THE WAVELENGTH DEPENDENCE OF IR LIGHT SCATTERING TO SIZE PARTICLES. AS A RESULT, IT CAN OPERATE IN DENSE AEROSOL STREAMS BECAUSE PARTICLES