Transmission electron microscope images of
TiO2 NP powder; (b) TiO2 NPs suspended in
HPMC solvent after incubation for 12 h. TEM images showed that
the sizes of the TiO2 NP powder or
TiO2 NPs suspended in HPMC solvent
for 12 h ranged from 5 to 6 nm, respectively.