Light scattering particle size

The development and refinement of population balance techniques for the description of the behavior of laboratory and industrial crystallizers led to the belief that with accurate values for the crystal growth and nucleation kinetics, a simple MSMPR type crystallizer could be accurately modelled in terms of its CSD. Unfortunately, accurate measurement of the CSD with laser light scattering particle size analyzers (especially of the small particles) has revealed that this is not true. In mar cases the CSD data obtained from steady state operation of a MSMPR crystallizer is not a straight line as expected but curves upward (1. 32. 33V This indicates more small particles than predicted... 

Particle size and distributions can be determined by a number of different methods. The technique described here is light scattering. Different measurement methods produce different results which can be correlated experimentally. The absence of distribution standards for light scattering particle sizing instruments precludes any determination of size accuracy. This is further complicated by particles of non-spherical shape which makes the concept of size very difficult to define. However, for particulate materials encountered in most industrial processes, the assumption that particles are spheres produces quite useful results that are repeatable and relate to important parameters of many processes. 

D-4464 Particle Size Distribution of Catalytic Material by Laser Light Scattering Particle size distribution of catalyst particles (20 to equivalent spherical diameter) as ascertained by laser scattering 150/im light... 

Figure 4 shows the impact of the number of primary particles per aggregate and the coefficient of penetration on the result of a dynamic light-scattering particle sizing of those aggregates. The impact of /is very low. Therefore, it is now very easy to give the number of primary patticles as a result of a PSD measurement rather than the equivalent spherical diameter 2 n,yd. 

Particle size analysis was done with a Coulter light scattering particle size analyzer. 

As a final note regarding classical light-scattering methods, it should always be borne in mind that light-scattering particle size averages are heavily influenced by the laigCT particles that are present... 

MCC was prepared by hydrolysing waste cotton fabric with hydrochloric acid. The MCC was characterized by measurement of laser light scattering particle size, WAXS morphology, SEM and thermogravimetric properties. 

Light-scattering particle size distribution analyzer, and friability tester. 

Pig. 9. Particle size distribution of rubber particles purified from guayule stem bark and Hevea latex. Measurements were made on rubber particles in aqueous suspension using a Horiba LA-900 Laser Light Scattering Particle Size Distribution Analyzer. —O—, Hevea — —, Guasnile. Data from Ref 12. 

As noted previously, monomers are used to produce the resins commonly used to manufacture a wide variety of products. The quality of the final product can be directly influenced by a number of process variables, one of which is particle size distribution. This section will address several applications of light-scattering particle size measurements as they pertain... 

P. E. Plantz, Concepts on the preparation of particulate for measurement by light scattering particle size analyzer. In M. Sharma and F. J. Micale, ed., Water-Based Coatings and Printing Technology, 1991, pp. 225-246. 

Figure 3 Schematic diagram for light-scattering particle sizing.

Ansari, R. R., Suh, K., Dynamic Light Scattering Particle Size Measurements in Turbid Media, Proc. SPIE-Int. Soc. Opt. Eng. 1998, 3251, 146-156. 

Washington C., The angular distribution of scattered light, in Particle Size Analysis in Pharmaceutics and Other Industries, Ellis Horwood, New York, 1992, 109. 

Laser diffraction Interaction of a laser beam with particles and detection of the scattered light X Particle size determination... 

Alumina ptaiticles of different size distributions provided by Sumitomo Chemical Inc. were used for die polishing experiments. A Honeywell Microtrac UPA 150 dynamic light scattering ptarticle size analyzer was used to measure the particle size distribution. Transmission electronic microscopiy and scanning electron microscopy were also used to determine the shapes and size of tiie alumina particles. 

Bommireddi A, Li L, Stephens D, Robinson D, Ginsberg E. Particle size determination of a flocculated suspension using a light scattering particle analyzer. Drug Dev Ind Pharm 1998 24 1089-1093. 

Mishchenko, M. and A. Macke, 1997 Asymmetry parameters of the phase function for isolated and densely packed spherical particles with multiple internal inclusions in the geometries optics limit. J. Quant. Spectros. Radiat. Transfer, 57, 767-794. Mishchenko, M. I., 1993 Light scattering by size-shape distribution of randomly oriented axially symmetric particles of a size comparable to a wavelength. Appl. Opt., 32, 4652-4666. 

There has been a tremendous growth in the application of light scattering technique for particle sizing in recent years and light scattering particle sizers have taken a... 

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