ALUMINUM CHLOROHYDRATE 283 i•.• • ..... j. • (-:',• %:. . : . • . ,. • ' m -• - . ' . .• • ß ... _t.','.? • ' ...'"•-. •.. •' • • • . •.. . . .•. • .. •. • .• • .. . ...• • -... q • •.• •.•. Figure 2. Scanning electron photomicrographs of aluminum chlorohydrate. Key: upper left, lyophilized, 700X, line of 50 um upper right, lyophilized, 5000X lower left, spray dried, 2000X, line of 5 um and lower right, air dried 10,000X. (Reproduced by permission from ref. 9.) ACH• H•O•! DRYING Figure 3. Schematic effect of drying on material composed of alternating layers of aluminum chlorohydrate (ACH) and water.
284 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Table I Comparison of Empirical Formula for Aluminum ChIorohydrate, A12(OH)sC1 ß 2H20, and AI•,O4(OH),4(H,O)•,C17 A12(OH)sC1. 2H20 Al•,O4(OH)24(H,O)•,CI7 AI:C1 2:1 13:7 (1.86:•) Al:H20 1:1 13:12 (1.08:1) AI:OH 1:2.5 13:32 (1:2.46) I H 7+ Figure 4. Structure of the Al•304(OH)24 ( 20)•2 complex showing the tetrahedral aluminum surrounded by 12 aluminums in octahedral configuration. (Reproduced by permission from R. Mesmer and C. Baes, The Hydrolysis of Cations, Wiley, New York, N.Y. 1976, Chap. 6.)
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