Download e-book for iPad: Additives and crystallization processes: from fundamentals by Keshra Sangwal

By Keshra Sangwal

ISBN-10: 0470061537

ISBN-13: 9780470061534

Crystal progress know-how comprises methods for the construction of crystals crucial for microelectronics, communique applied sciences, lasers and effort generating and effort saving expertise. A intentionally further impurity is named an additive and in several industries those impact the method of crystal progress. hence, knowing of interactions among ingredients and the crystallizing levels is necessary in numerous strategies present in the lab, nature and in a number of industries.

This ebook offers a generalized description of the mechanisms of motion of additions in the course of nucleation, development and aggregation of crystals in the course of crystallization and has acquired endorsement from the President of the foreign association for Crystal development. it's the first textual content dedicated to the position of additions in several crystallization procedures encountered within the lab, nature and in industries as varied as prescribed drugs, nutrition and biofuels.

a distinct spotlight of the e-book are chapters at the impression of additions on crystal progress approaches, because the phenomena mentioned is a controversy of discussion among researchers

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Extra info for Additives and crystallization processes: from fundamentals to applications

Example text

However, in the solution-mediated transformation, the kinetics depend on the dissolution rates of the metastable phase and on the nucleation and growth rates of the stable phase. These rates depend on several factors, such as the difference in solubility, crystal size, temperature, impurities, and stirring. In the latter case the transformation 3D Nucleation and Metastable Zone Width 41 Solution concentration c kinetics are followed by measuring the evolution of solute concentration or fractional concentration of the powder crystals in contact with the solution.

7 (a) Schematic illustration of heterogeneous 3D nucleation on a foreign particle of radius Rs ; crystal embryo (c), foreign substrate particle (s) and mother phase (f). (b) ∗ Dependence of factor m R on the relative particle size R = Rs /r3D and m. Y. Liu, K. Tsukamoto, and M. Sorai. Langmuir 16, 5499. 36), the factors m R and m R play different roles in different supersaturation regimes. 21)]. Consequently, the exponential term associated with the nucleation barrier is dominant over contribution from collisions of embryos due to the available effective surface area on the substrate, represented by the factors m R and 34 Additives and Crystallization Processes m R .

The overall crystallization may occur by a mononuclear or polynuclear mechanism involving the formation of one or many nuclei in the volume, respectively. There are two routes to the formation of many nuclei in the volume. In the first case, the nuclei may be formed in the system at the initial moment t = 0 and thereafter they grow irreversibly until the completion of crystallization in the entire volume. In the second case, the nuclei form continuously during the crystallization process. These two processes are known as instantaneous and progressive nucleation mechanisms, respectively.

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Additives and crystallization processes: from fundamentals to applications by Keshra Sangwal

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