However, because there is a concentration difference between the inside and outside of the tube of HNTs and the diameter of MO molecules is about 6~8nm smaller than that of HNTs, MO can enter the inside of HNTs from the orifice of the nanotube with the aqueous solution. MO enters the HNTs from the nozzle position to avoid encountering the negative charges on the outer tube wall of the HNT, so its diffusion movement is not affected by the same kind of charges on the tube wall.
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