Table 1.
ζ Potential of Polymer-SWNTsa
| polymer | polymer-SWNT mobility [μm cm/(V s)] | polymer-SWNT apparent ζ potential [mV] |
|---|---|---|
| COOH-SWNT (no polymer) | −3.928 ± 0.039 | −50.1 ± 0.529 |
| branched polyethylenimine (800) | 4.289 ± 0.363 | +54.7 ± 1.27 |
| linear polyethylenimine (5000) | 3.571 ± 0.057 | +45.6 ± 0.723 |
| branched polyethylenimine (750K) | 5.169 ± 0.082 | +65.9 ± 1.01 |
| branched polyethylenimine (25K) | 5.614 ± 0.083 | +71.6 ± 1.06 |
| branched polylysine | 4.238 ± 0.178 | +54.0 ± 2.27 |
| linear polyethylenimine (800) | 4.696 ± 0.046 | +59.9 ± 0.586 |
| low hydrophobic modified branched polyethylenimine | 5.702 ± 0.082 | +72.8 ± 1.07 |
| medium hydrophobic modified branched polyethylenimine | 5.428 ± 0.035 | +69.2 ± 0.451 |
a
Values represent the average and standard deviation of three measurements. Samples are suspended at a pH between 7 and 8. Mobility measurements are converted to apparent ζ potential using the Smoluchowski model with a f(ka) value of 1.50.