Nucleophilic Addition to Fullerenes
The reactivity of fullerenes toward nucleophiles is caused by their electron deficiency. Numerous reactions with nucleophilic reagents leading to useful and interesting derivatives have been described. The nucleophilic addition to fullerenes corresponds to the common mechanism observed for electron-deficient olefins. A nucleophile A- initially attacks the double bond and a reactive intermediate C-0A- is generated. This can be stabilized in several ways. The product C60AE results from the...
Helical Carbon Nanotubes hMWNT
It was not long after the discovery of carbon nanotubes before specimens with coiled or helical shapes were observed. These helical nanotubes hMWNT are often found as by-product in the synthesis of multiwalled nanotubes, yet by now a directed preparation has succeeded as well. Their extraordinary shape turns the helical nanotubes into an interesting subject of research as the expected electronic properties like inductive effect under electrical current should enable an application, for example,...
Chemical Vapor Deposition CVD 1
Like in the preparation of single -walled carbon nanotubes, the chemical vapor deposition of MWNT consists in the generation of small carbon clusters or atoms from precursor compounds. The products precipitate in the shape of different carbon materials with the reaction conditions determining the specific structure of the substance. The simplest CVD method is the thermal decomposition of carbonaceous compounds in a heated quartz tube bearing a substrate that is coated with catalyst particles....