Chemical Processing of Nanostructured Coatings

Nanocatalysts with Tunable Properties Derived from Polystyrene-b-poly(vinyl pyridine) Block Copolymer Templates for Achieving Controllable Carbon Nanotube Synthesis

“…In general, it is difficult to use PS-b-P4VP templates to reproducibly produce highly ordered, uniformly sized cobalt and nickel nanoparticles. Hydrated cobalt(II) and nickel(II) are highly reactive, and as a result they tend to complex with more than one 4-pyridine group . Thus, the inter- and intramolecular bond formation caused by multiple complexation can hinder the self-assembly process.…”

“…Hence, nanoparticles with reasonable periodicity and size control can be repeatedly attained using PS-b-P4VP templates. The low stability constants of Co(II) and Ni(II) with 2-methylpyridine, due to the steric hindrance effect of the 2-methyl group, suggests that these metals do not have the tendency to react with more than one pyridine group . Thus, PS-b-P2VP is a better candidate to generate highly ordered transition metal nanoparticles.…”

“…Hydrated cobalt(II) and nickel(II) are highly reactive, and as a result they tend to complex with more than one 4-pyridine group. 33 Thus, the inter-and intramolecular bond formation caused by multiple complexation can hinder the self-assembly process. However, Fe(II) is less likely to form complexes with more than one ligand.…”

Nano-structured titanium dioxide microsphere for humic acid removal in water

“…Their physical and chemical properties gradually change from solid state behavior to molecular with decreasing particle size. The sizes of the individual particles are normally in the range of 1 -100 nm in diameter (Siegel, 1993;Kurihara, 2000). A unique property of nano-particles is their extremely high surface area.…”

“…Nano-structured material is a term used to describe any material produced or composed in which the scale of the main microstructural features is ultra-fine, usually in the range 1 to 100 nrn (Siege], 1993; Kumzerov, 2000;Kurihara, 2000).…”