1) Carbon nanotube 
Gadonanotube are carbon nanotubes containing superparamagnetic clusters of Gd3+ ions. They are linear molecular magnets and efficient contrast agents for magnetic resonance imaging (MRI). The term gadonanotube was introduced in 2005. ==Preparation== Owing to their large magnetic moment (µ2 = 63µB2) Gd3+ ions are the most popular MRI contrast age...