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