2. Clay
2.1 Common features
The most common clays are phyllosilicates or smectites. Their main characteristic is their nanometre-thick crystalline sheet structure (and consequent high form factor), which gives them a high specific surface area. Generally speaking, clays contain impurities such as quartz...
The classification of clays is defined not only by their crystalline structure, but also by the quantity and position of ions within the unit cell. The main classes range from kaolins, with a uniform chemical composition, to smectites, with highly variable compositions and cation exchange capacities. The spacing between individual sheets is governed by the presence of cations in the interfoliar space.
It should be noted that there are also...
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Clay
Nanocomposite structure
Economic data
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Nanotechnologies, in the broadest sense of the term, now represent a real economic challenge. The financial efforts of countries such as the United States, Japan and the European Union in this field have been growing rapidly since the late 1990s. Public support for nanotechnologies in all countries combined totaled 3.5 billion euros in 2003. It is growing at a rate...
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