CVG-2107 (Chapter 2) 9

CVG-2107 (Chapter 2) 9 - 1:1 clays consist of one silica...

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Prof. M. Fall - Uniersity of Ottawa Prof. M. Fall - Uniersity of Ottawa 9 Source Siva 4.3 Different types of clay minerals 1:1 Clay Mineral (e.g., kaolinite, halloysite): Basal spacing is 7.2 Å layer Trovey, 1971 ( from Mitchel , 1993) 17 μ m 4.3 Different types of clay minerals 1:1 Clay Mineral kaolinite •Si 4 Al 4 O 10 (OH) 8 . Platy shape •The bonding between layers are van der Waals forces and hydrogen bonds ( strong bonding ). •There is no interlayer swelling •Width: 0.1~ 4 μ m, Thickness: 0.05~2 μ m 4.3 Different types of clay minerals Si Al Si Al Si Al Si Al joined by strong H-bond no easy separation 0.72 nm Typically 70-100 layers joined by oxygen sharing 1:1 Clay Mineral (e.g., kaolinite, halloysite): Kaolinite Source Siva 4.3 Different types of clay minerals
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Unformatted text preview: 1:1 clays consist of one silica sheet and a sheet of alumina. Layers are bound very tightly and don’t let water infiltrate. 1:1 Clay Mineral (e.g., kaolinite, halloysite): 4.3 Different types of clay minerals h used in paints, paper and in pottery and pharmaceutical industries Halloysite h kaolinite family; hydrated and tubular structure h (OH) 8 Al 4 Si 4 O 10 .4H 2 O h (OH) 8 Al 4 Si 4 O 10 Kaolinite 1:1 Clay Mineral 4.3 Different types of clay minerals Different combinations of tetrahedral and octahedral sheets form different clay minerals: We can distinguish tree main groups of clay minerals 1) 1: 1 clay minerals 2) 2: 1 clay minerals 3) 2:1:1 clay minerals...
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This note was uploaded on 03/21/2011 for the course GNG 4124 taught by Professor Soils during the Spring '11 term at Uni. of Nottingham Ningbo.

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