This silica serves as a basis for an EU certified reference material. Silica Koestrsol served as a sample for all measurements.
PARTICLE SIZER VERIFICATION
Here we present the results of such a verification test when comparing DLS, Centrifugation, ELS, X-ray scattering, and acoustic spectroscopy. Consequently, the verification tests confirm that this method yields particle size distributions that are very close to those determined using other characterization techniques. Some results of such verification are presented in the book “Characterization of Liquids, Nano- and Microparticulates, and Porous Bodies using Ultrasound” (2017).
Many different groups verified the theory for the acoustic spectroscopy using a wide variety of samples.
PARTICLE SIZER ISO
Details of this method are described in the International Standard ISO 20998-1:2006 “Measurement and characterization of particles by acoustic methods - Part 1: Concepts and procedures in ultrasonic attenuation spectroscopy”. There is a well-developed theory that takes into account particles’ interactions, which is imperative when extracting particle size distributions from attenuation spectra in concentrated systems.
Accordingly, such attenuation spectrum is the raw data for calculating particle size distribution. This method is based on measuring the attenuation of ultrasound at a set of frequencies in the MHz range when propagation distance varies. However, it stands alone from other macroscopic methods because of its capability of characterizing concentrated systems without dilution. ACOUSTIC SPECTROSCOPY.Īcoustic spectroscopy belongs to the group of macroscopic fitting methods as well. Theoretical aspects of the light scattering are well known and described in detail in the ISO standards referenced below. It relates this information to particle size. Calculation of the particle size distribution requires a theory. In the case of static light scattering instruments, the raw data measured is the intensity of scattered light versus angle. The particle size distribution is extracted then from this measured raw data using an appropriate theory. All of these methods rely on the measurement of a certain property of a sample that contains particles. Methods that are classified as macroscopic fitting techniques include light scattering, x-ray scattering, neutron scattering, and acoustic spectroscopy. Below we present links to several International Standards which provide descriptions of some of these methods. There are three distinctively different groups of the particle sizers: 1) counters 2) fractionation methods 3) macroscopic fitting methods. These industries include pharmaceuticals, cements, ceramics, paints, emulsions, etc.
Measurements of the particle size and particle size distribution are extremely important tools for research and development, as well as a quality control, in many industries. Instead, we must instead determine the system’s particle size distribution. It is not sufficient to simply determine a single particle size in order to adequately characterize such systems. Therefore, the particles in a particular sample vary in size. These systems are generally polydisperse. There is a wide variety of real systems that contain particles within this size range. Particle size is a geometric characteristic that is usually assigned to material objects with sizes ranging from nanometers to millimeters.
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