Rapid separation of nanodiamond particles by viscosity gradient centrifugation

摘要: The nanodiamond (ND) particles have several potential applications including tribology, drug delivery, bioimaging, etc. However, the severe colloidal aggregation tendency of ND strictly limits its exploitation. Moreover, due to NDs rich surface chemistry and relatively small size, it is still difficult separate these large using conventional separation methods. Herein, we develop an efficient straightforward strategy aminated nanodiamonds (ND-NH2) into size nanoparticles by viscosity gradient centrifugation method in a polyvinylpyrrolidone (PVP) aqueous solution. Prior after separation, pristine ND-NH2 morphology were characterized DLS (dynamic light scattering analyzer) TEM (transmission electron microscopic), which show that with narrow distribution uniform can be easily separated PVP This simple, rapid effective could extended other functionalized different sizes.