Natural mineral nanotubes : properties and applications by Pooria Pasbakhsh, G. Jock Churchman

By Pooria Pasbakhsh, G. Jock Churchman

The booklet offers a large creation on background, minerology, geology, and the features and alertness of other ordinary nanotubes. it's the first complete booklet to debate common nanotubes, relatively halloysite nanotubes. The e-book may be worthy ordinarily for postgraduate scholars and researchers engaged on the applying of traditional nanotubes. it is going to even be precious for these businesses or researchers that concentrate on the layout of fabrics and composites for sustainability.

This book:

• offers updates at the diversified and increasing purposes of usual mineral nanotubes (including halloysite, sepiolite, and palygorskite) in a number of industries, and polymer nanocomposites for scientific, overall healthiness, and environmental applications

• offers a entire overview of the amendment and intercalation of alternative common mineral nanotubes

• reports fresh stories of the mechanical houses of halloysite nanotubes

• presents an up to date heritage at the constitution, id, and nomenclature of varied usual mineral nanotubes, together with halloysite, palygorskite, sepiolite, chrysotile, and erionite

• offers accomplished international details at the mineralogy, geology, and prevalence of normal mineral nanotubes

• Discusses the present knowing of the healthiness dangers of common mineral nanotubes

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1994) in that Al content cannot distinguish between kaolinite and halloysite. Singh and Mackinnon (1996) transformed kaolinite to a hydrated form using repeated applications (~10 to ~35) of potassium acetate as the swelling agent. After 35 cycles, they found that cation exchange capacity increased to 32 meq/100 g (vs. 10 meq/100 g for the kaolinite), that the surface area was ~10 m2/g (vs. 6 m2/g for kaolinite), that suspensions were viscous and readily flocculated at pH 10, and the number of coarse particles decreased from a size of <15 μm in kaolinite to <1 μm after treatment.

As with the natural material (Robertson and Eggleton, 1991), tubes were spirals with planar features (prismatic) on the outside and “smoothly curved” layers on the inside. Tube characteristics, such as length and stacking periodicity, are probably a function of the parent kaolinite. Tube diameters and wall thicknesses are variable and similar to natural tubes at diameters of 100–500 nm (Singh and Gilkes, 1992), with wall thicknesses of 10–50 nm (Singh and Mackinnon (1996). , 1950). Diameters of natural spherical forms are ~150 nm.

Hydrothermal experiments by Tomura et al. , 2005) indicate that supersaturated solutions associated with volcanic ash and pumice, and volcanic glass in marine environments, commonly lead to the formation of spherical and spherical-like forms by direct precipitation. White et al. (2012) reported the synthesis of a variety of morphologies, including spheres, in hydrothermal reactions which presumably do not involve a topotactic reaction. 1 WHY HYDRATION OCCURS? Hydration in kaolinite will occur if the hydrogen bonding network (= layer-to-layer interactions) is sufficiently disrupted so that H2O molecules may enter the interlayer to form halloysite.

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