![]() The sample de-agglomerates (breaks down into smaller sized particles) as particles collide with each other or with the wall of the dispersion unit.Ī typical result of a laser diffraction measurement is shown in Figure 11. In dry mode the powder is put into motion either by compressed air or by gravity, creating a dry flow which is positioned in front of the laser beam. The liquid dispersion unit is usually equipped with a mechanical stirrer with adjustable speed and with a sonicator with adjustable duration and power. The sample keeps circulating until the measurement is done. In liquid mode the particles are dispersed in a liquid and pumped into a glass measurement cell which is placed in front of the laser. it should be measured in liquid mode if the final product is a liquid dispersion and in dry mode if the final product is a powder. Usually a sample should be analyzed in a state relevant to its application, i.e. This means that each particle should be visible as a single particle in front of the laser, moving through either liquid medium or air. The course consists of two successive days of 8 hours each.In order to get a clear diffraction, it is necessary to have a proper dispersion of the sample. Emphasis lies on the practical use and application of the techniques and how to translate results to the practical situations. Practical demonstrations of the various types of equipment are used to alternate with the various lectures. In this laboratory the most important techniques in the area of particle size and shape characterization including sampling and sample pre-treatment equipment is available. The course is organized by and at the premises of Delft Solids Solutions, where also a fully equipped laboratory is available. Quality, reference materials and standards.Forward light scattering (Laser Diffraction).Electrical Sensing Zone (Coulter principle).Introduction solid matter and particles.The central theme addressed in this course is how to define and characterize the size and shape of a particle or a set of particles. Both courses are scheduled together in order to enable attendance of both courses in a series of 3 days. This course is in close relation to the 1-day course Porosity and Surface Area Characterization. A fully-equipped laboratory is located in the same premises as where the course is taught, which enables a perfect blend between theory and practice. Accuracy, quality and quality control are separate topics that are dealt with together with selection of appropriate measurement techniques. Pros and cons of the techniques are highlighted and common pitfalls in particle size characterization are interactively discussed. In the first 2-day course Particle Size Characterization the overall basic principles and definitions of particle size and particle shape are being discussed and particle size distribution techniques are being explained and compared. In the chemical industry alone, half of the final products and 75% of the semi-finished products is in powder or granular form.ĭelft Solids Solutions offers two courses devoted to particle characterization: Approximately 80% of the industrial processes deals with such solid matter. Powders and granular material are of key importance in industry. Particle characterization concerns a wide range of materials and products: ranging from large molecules (proteins and polymers), micelles, micro-emulsions, viruses, droplets, latexes, fine dust particles, pigments, clay and minerals up to sand and gravel. Why the course Particle Size Characterization?
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