Table 1.
Characterization of as-prepared MSN-OH, MSN-NH2 and MSN-PEG samples.
| Sample | N2 Physisorption | Coverage NH2 | Coverage PEG4 | Diameter (nm) b | ζ-Potential (mV) | ||||
|---|---|---|---|---|---|---|---|---|---|
| SBET (m2/g) |
Vpore (cm3/g) |
dpore (nm) |
(mmol/g) | (µmol/m2) | (mmol/g) | (µmol/m2) | |||
| MSN-OH | 1106 | 1.25 | 3.9 | 0 | 0 | 0 | 0 | 45.0 ± 25.8 | −17.5 ± 1.5 |
| MSN-NH2 | 471 | 0.44 | 3.1 | 2.11 | 4.48 a | 0 | 0 | 45.4 ± 22.3 | −8.9 ± 3.4 |
| MSN-PEG | 80 | 0.34 | 2.4 | 1.42 | 17.75 a | 0.69 | 8.63 a | 50.9 ± 29.3 | −0.3 ± 0.3 |
a Surface organic group coverage: µmol/g (from carbon elemental analysis) divided by m2/g (from N2 physisorption). b Hydrodynamic diameter determined by DLS.