Montmorillonite structural representation

An idealized three-dimensional representation of calcium montmorillonite structure at the atomic level is shown in Figure 1. The 2 1 layered structure is composed of upper and lower layers of silicon oxide tetrahedra linked in hexagonal arrays to form two-dimensional silicate sheets extending in the a,b-directions. Sandwiched between these sheets are partially filled two-dimensional sheets composed of... 

FIG U RE 7.2 Schematical representation of the montmorillonite structure. (From Anadao P., 2011, In Advances in Nanocomposite Technology, ed. Hashim, A., 133-46. Rijeka InTech.)... 

Figure 9.12 Schematic representation of the structures of muscovite mica, (K2Al4(Si6Ali)02o(OH)4], hydrated montmorillonite, [Al4Sig02o(OH)4].xH20 and chlorite, (MgioAl2(Si6Al2)02o(6H)i6], see text.

Figure 18. Schematic representation of several possible types of solid solution. Shaded and blank layers represent expanding and mica-like units (2 1 structures). Solid and unfilled circles represent two species of interlayer ions, a totally random in all aspects b = interlayer ion ordering, single phase montmorillonite c = ordered interlayer ions which result in a two-phase mica structure, two phases present d = randomly interstratified mineral, one phase e = regular interstratification of the 2 1 layers giving an ordered mixed layered mineral, one phase present f = ordered mixed layered mineral in both the interlayer ion sites and the 2 1 interlayering. This would probably be called a single phase mineral.

Figure 1. Three-dimensional representation of the atomic structure of Ca-montmorillonite. (This figure is available in full color at http //www.mrw.interscience.wiley.com/biofp.)...

Fig. 10.16. Schematic representation of a) the layered structure of montmorillonite and b) pillared montmorillonite.

Figures. Schematic representation of the structures of zeolite Y (3-D), montmorillonite clay (2-D), zeolite mordenite (1-D) and a.-cyclodextrin (0-D)...

Figure 14. (A) Polyhedral representation of montmorillonite showing the linkage of the tetrahedral sheet with the octahedral sheet. (B) Effective change in the average Fe-0 bondlength upon reduction of Fe(III) to Fe(II) results in the distortion of the local clay crystal structure.

FIGURE 33.1. Representation of the two to one structure of montmorillonite showing the centrai octahedraiiy coordinated Aiuminums sandwiched between two tetrahedraiiy coordinated siiicons. Atoms above and beiow the iayer are exchangeabie cations and their associated waters of hydration. 

Fig. 1 Representation for the crystal structure of montmorillonite [14]. Copyright 2011. Reproduced by permission of Elsevier Science Ltd.

Figure 1 Schematic representation of layered structure of (a) clay (montmorillonite, MMT), (b) intercalated, and (c) defoliated polymer nanocomposites (not to scale).

---