Calibration of Polarization-Sensitive and Dual-Angle Laser Light Scattering Methods Using Standard Latex Particles.

A polarization-sensitive laser light scattering (PSLLS) method and a dual-angle laser light scattering (DALLS) method have been studied for in situ measurement of submicrometer hydrosol and aerosol particles. By using standard monodisperse polystyrene latex particles suspended in water and air as test particles, calibration of systems built based on the above methods have been performed. The effects of light scattered by agglomerated aerosol particles (multiplets) were corrected by considering the fraction of multiplets as determined with an aerosol measurement technique using a differential mobility analyzer. The change in the measured intensities of scattered light with particle diameter was then determined by calculations based on Mie theory. It was shown that the PSLLS system can determine particle diameters as small as approximately 60 nm for the test hydrosol particles and approximately 100 nm for test aerosol particles, respectively. The DALLS system can determine smaller diameters than the PSLLS system for test particles with no light absorption. The change in scattered light intensities with particle diameter was also investigated by theoretical calculations with various refractive indexes and scattering angles. The PSLLS and DALLS systems promise to become routine measurement tools for absorbing and nonabsorbing particles, respectively. Copyright 2001 Academic Press.

[1]  M. Kerker,et al.  Particle Size Distribution in Sulfur Hydrosols by Polarimetric Analysis of Scattered Light , 1950 .

[2]  H. V. Hulst.  Light Scattering by Small Particles , 1957 .

[3]  W. D. Erickson,et al.  Light scattering measurements on soot in a benzeneair flame , 1964 .

[4]  Milton Kerker,et al.  The Scattering of Light and Other Electromagnetic Radiation ~Academic , 1969 .

[5]  P. A. Bonczyk.  Measurement of particulate size by in situ laser-optical methods: A critical evaluation applied to fuel-pyrolyzed carbon , 1979 .

[6]  Z. Kam,et al.  Absorption and Scattering of Light by Small Particles , 1998 .

[7]  Jerry M. Seitzman,et al.  Planar laser-fluorescence imaging of combustion gases , 1990 .

[8]  P. Biswas,et al.  In Situ light scattering dissymmetry measurements of the evolution of the aerosol size distribution in flames , 1992 .

[9]  C. Sorensen,et al.  Light-scattering measurements of monomer size, monomers per aggregate, and fractal dimension for soot aggregates in flames. , 1992, Applied optics.

[10]  J. Miller,et al.  Statistics for Analytical Chemistry , 1993 .

[11]  A. Howling,et al.  Spatiotemporal powder formation and trapping in radio frequency silane plasmas using two‐dimensional polarization‐sensitive laser scattering , 1995 .

[12]  H. Ohkura,et al.  Growth processes of particles in high frequency silane plasmas , 1996 .

[13]  Takashi Yoshioka,et al.  Simultaneous in situ measurements of properties of particulates in rf silane plasmas using a polarization-sensitive laser-light-scattering method , 1996 .

[14]  P. Biswas,et al.  In situ characterization of vapor phase growth of iron oxide-silica nanocomposites: Part I. 2-D planar laser-induced fluorescence and Mie imaging , 1996 .

[15]  M. Kerker.  Light Scattering Instrumentation for Aerosol Studies: An Historical Overview , 1997 .

[16]  A. Quirantes,et al.  Static Light Scattering Study of Size Parameters in Core–Shell Colloidal Systems , 1997 .

[17]  Christopher M. Sorensen,et al.  Aerogelation in a Flame Soot Aerosol , 1998 .

[18]  K. Okuyama,et al.  Particle generation and thin film surface morphology in the tetraethylorthosilicate/oxygen plasma enhanced chemical vapor deposition process , 2000 .

[19]  Michael Quinten,et al.  Sizing of Aggregates of Spheres by a White-Light Optical Particle Counter with 90° Scattering Angle , 2001 .