Table 1.

The size distributions, PDI, and surface zeta potentials of the various surface-modified PNPs suspended in PBS buffer.

	Entry	Modified PNP	Size in PBS buffer (nm)	PDI	Zeta potential, ζ (mv)
	1	PEO	534 ±27	0.430	−17±1.8
	2a	Unmodified	895 ± 98	0.904	−16±1.4
	2b	Unmodified	(211 ± 13)*	(0.036)	-
	3	NEt3	191 ±15	0.004	+32 ± 0.8
	4	HNEt2	203 ± 21	0.040	+43±1.1
	5	H2NEt	210±22	0.034	+55 ±1.6
	6		219±27	0.080	+52 ±1.7
	7		209 ±15	0.024	+54±1.3
	8a	Unmodified	118±9	0.024	+58 ±3.2
	8b	Unmodified	(113 ±13)*	(0.017)	-
	9		1310 ±130	0.277	+41 ±1.5
	10		2356± 115	0.356	−17± 1.3

^*in ultrapure deionized water