Advances in the characterization of industrial minerals
The use of minerals by man is as old as the human race. In fact the advancement of human civilization has been intimately associated with the exploitation of raw materials. It is not by chance that the distinction of the main historical eras is based on the type of raw materials used. Hence the passage from the Paleolithic and Neolithic Age to the Bronze Age is characterized by the introduction of basic metals, mainly copper, zinc and tin, to human activities and the Iron Age was marked by the introduction of iron. Since then the use of metals has increased and culminated in the industrial revolution in the mid-eighteenth century which marked the onset of the industrial age in the western world. However, during the past 50 years, although metals were equally important to western economies as they had been previously, the amount of metals extracted annually in western countries has decreased significantly and metal mining activity shifted mainly to third world countries (in Africa, South America, Asia) and Australia, due to economic and environmental constraints. At the same time the role of industrial minerals has become increasingly important for the western economies and today, in developed EU countries, the production of industrial minerals has surpassed by far the production of metals. In some EU countries, metal mining activities have stopped completely. The importance of industrial minerals is expected to increase further in the future.
Industrial Clay Minerals as Nanomaterials
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Published:January 01, 2010
Abstract
This chapter examines the use of industrial clay minerals as nanomaterials. In the first part, clay minerals are introduced and a survey is given of those properties which are relevant for clay-polymer nanocomposites (CPN). These properties are: morphology of the clay-mineral particles, sizes and shapes of the layers, cation exchange, and hydro-philic and hydrophobic properties. Then, the methods of CPN preparation are reviewed briefly, followed by the factors which influence the properties of CPN. Special attention is given to clay-mineral-based bionanocomposites and functional clay-minerals films. The latter can be prepared by spin coating, layer-by-layer assemblage and the Lang-muir-Blodgett technique. A broad range of properties can be introduced in films prepared with appropriate molecules such as polymers, chiral molecules, molecules with non-linear optical properties and magnetic molecules. The area of CPN is broad and open for fundamental and applied research.