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Particle Sizing Across the CPI

By Remi Trottier, Shrikant Dhodapkar and Stewart Wood, The Dow Chemical Co. |

Particulate systems are everywhere; they are responsible for bright red sunsets, the texture of chocolate and the rate of drug delivery in the human body. Particulate processing and size control originated back in prehistoric times where mixtures of pigments were finely pulverized and used in the painting of cavern walls. From those primitive beginnings, the use and processing of particulate matter has grown to be of paramount importance in virtually all modern industries. For example, the flow of granular materials, the sintering behavior of metallurgical powders, the combustion efficiency of powdered coal, and the hiding power and gloss of aluminum pigments [ 1 ] are all particulate systems that are heavily influenced by particle size and shape. Meanwhile, the past decade has seen rapid evolution and growth of applications in nanosized particulate materials, signaling that the increasing importance of particle characterization is set to continue [ 2 – 5 ]. A particle can be defined as single unit of material having discrete physical boundaries that define its size, usually in micrometers, μm (1 μm = 1×10–4cm = 1×10–6m). Particle science is typically limited to particulate systems within a size…
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