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- W2369958469 abstract "The agglomeration phenomenon of 7-aminocephalosporanic acid (7-ACA) crystals made from two different crystallization processes is studied. From the SEM photos of the crystals, it can be seen that the agglomeration of crystals takes place when the pH value higher than 1. 5 in the crystallization process of acid method, but no agglomeration appears in the products from the basic method. The scanning electron microscopy (SEM) micrographs of 7-ACA are processed into digital images by a scanner and the image procession software-Photoshop. From these images, it can be seen that the grayscale distributions are extremely similar, which indicates that the morphology of 7-ACA crystallization exhibits self-similarity at different scales. The fractal dimensions of 7-ACA crystals are determined by box-dimension method. Zeta potentials are measured at different pH values. In addition, the capillary rise of liquid in columns packed with 7-ACA powder is measured and the wettabilities of the two 7-ACA samples on different solvents are determined. Combining the results of IR and powder X-ray diffraction, the functional groups on the surfaces of two kinds of crystals are presumed." @default.
- W2369958469 created "2016-06-24" @default.
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- W2369958469 date "2006-01-01" @default.
- W2369958469 modified "2023-09-23" @default.
- W2369958469 title "Agglomeration Phenomenon of 7-Aminocephalosporanic Acid and Crystallization Surface Characteristic" @default.
- W2369958469 hasPublicationYear "2006" @default.
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