Table 1.

Zeta potentials of ND-MWCNT and MWCNT-7 in PBS (pH 7.2) and serum-free media (pH 7.6).

	Dimensions		Zeta potential (mV)	(Mean ± standard error)
ND-MWCNT	Length (μm)	5.28 ± 2.07	PBS (pH 7.2)	− 13.9 ± 0.483
	Width (nm)	79.7 ± 19.4	Serum-free media (pH 7.6)	− 12.9 ± 0.835
MWCNT-7	Length (μm)	3.86 (GSD 1.94)	PBS (pH 7.2)	− 15.8 ± 0.450
	Width (nm)	49 ± 13.4 nm	Serum-free media (pH 7.6)	− 12.2 ± 0.283