Table 2.

Electrophoretic mobility, zeta potential, and electrokinetic charge density of Ludox TMA silica nanoparticles as a function of pH without added salt and with 100 mM NaCl

Added salt	pH	Ionic strength	μ e	ζ	σ 0
		mM	10−8 m2 s−1 V−1	mV	e nm−2
0 mM	2.0	10	−1.84	−37	−0.01
	3.0	1	−2.03	−41	−0.03
	4.1	7	−2.41	−47	−0.06
	5.0	1	−2.77	−57	−0.03
	6.0	4	−2.72	−54	−0.06
	7.0	9	−2.83	−55	−0.09
	8.0	3	−3.01	−60	−0.06
	9.0	8	−3.22	−62	−0.10
	10.0	3	−3.36	−67	−0.07
	11.0	8	−3.24	−63	−0.10
100 mM	2.0	110	−0.27	−13	−0.06
	2.9	101	−1.00	−17	−0.08
	4.0	106	−1.12	−19	−0.09
	5.2	101	−1.24	−21	−0.10
	6.2	106	−1.51	−25	−0.12
	6.9	109	−1.65	−27	−0.14
	8.2	104	−2.23	−37	−0.19
	9.1	108	−2.52	−42	−0.22
	10.2	104	−2.65	−44	−0.23
	11.0	108	−2.47	−41	−0.22