Figure 1

Micrographs of agglomerated carbon black nanomaterial suspended in citrated and phosphate–buffered saline. Agglomerated carbon black (CB) nanomaterial suspended in citrated and phosphate buffered saline (PBS) as observed by transmission electron microscope (TEM) (A) and scanning electron microscope (SEM) (B). The primary particles are amorphous with homogeneous size about 20 nm. A small number of larger agglomerates were found in PBS, as observed by TEM (C) and by the optical microscope (D1), and in platelet rich plasma (D2). Black arrows point to agglomerates, white arrow points to an erythrocyte and gray arrow points to a platelet.