Table 1 Structural characterization of SIPPs
Value | Description | Units | 18SIPP30 | 18SIPP60 | 16SIPP30 | 16SIPP60 | 14SIPP30 | 14SIPP60 | 12SIPP30 | 12SIPP60 |
|---|---|---|---|---|---|---|---|---|---|---|
L | Chain length | - | 18 | 18 | 16 | 16 | 14 | 14 | 12 | 12 |
t | Reflux time | min | 30 | 60 | 30 | 60 | 30 | 60 | 30 | 60 |
d | Diameter | nm | 11.29 ± 3.22 | 7.20 ± 1.81 | 6.83 ± 1.34 | 5.14 ± 2.13 | 7.34 ± 1.22 | 6.14 ± 1.67 | 7.92 ± 1.29 | 7.34 ± 1.12 |
CV | Coefficient of variation | % | 28.49 | 25.1 | 19.6 | 41.5 | 16.6 | 27.3 | 16.3 | 15.3 |
V p | Particle volume | cm3 | 1.95 × 10−18 | 1.96 × 10−19 | 1.67 × 10−19 | 7.12 × 10−20 | 2.07 × 10−19 | 1.21 × 10−19 | 2.60 × 10−19 | 2.07 × 10−19 |
S | Surface area | cm2 | 7.55 × 10−12 | 1.63 × 10−12 | 1.47 × 10−12 | 8.31 × 10−13 | 1.69 × 10−12 | 1.19 × 10−12 | 1.97 × 10−12 | 1.69 × 10−12 |
C p | Suspension concentration | mg/mL | 9.33 ± 0.70 | 18.30 ± 0.00 | 5.36 ± 0.43 | 4.92 ± 0.13 | 4.29 ± 0.47 | 5.68 ± 0.43 | 3.22 ± 0.25 | 4.74 ± 0.40 |
C Fe | Iron concentration | mg/mL | 0.369 ± 0.001 | 0.315 ± 0.0009 | 0.163 ± 0.001 | 0.151 ± 0.001 | 0.214 ± 0.00007 | 0.210 ± 0.001 | 0.080 ± 0.0004 | 0.139 ± 0.0007 |
C Pt | Platinum concentration | mg/mL | 0.914 ± 0.001 | 1.068 ± 0.0007 | 0.332 ± 0.002 | 0.534 ± 0.002 | 0.583 ± 0.0003 | 0.692 ± 0.001 | 0.205 ± 0.0002 | 0.463 ± 0.0007 |
N a Fe | Iron atoms in 1.0 mL | - | 3.98 × 1018 | 3.40 × 1018 | 1.76 × 1018 | 1.63 × 1018 | 2.31 × 1018 | 2.26 × 1018 | 8.63 × 1017 | 1.50 × 1018 |
N SIPP | Nanoparticles per milliliter | SIPP/mL | 1.04 × 1014 | 1.02 × 1015 | 4.96 × 1014 | 1.37 × 1015 | 5.90 × 1014 | 1.08 × 1015 | 1.71 × 1014 | 4.21 × 1014 |
AFe | Atomic percent Fe | at.% | 58.5 | 50.8 | 63.1 | 49.8 | 56.2 | 51.4 | 57.7 | 51.1 |
APt | Atomic percent Pt | at.% | 41.5 | 49.2 | 36.9 | 50.2 | 43.8 | 48.6 | 42.3 | 48.9 |
Fe/Pt | Fe/Pt stoichiometry | - | 1.41 | 1.03 | 1.71 | 0.99 | 1.28 | 1.06 | 1.36 | 1.05 |
ρ FePt | Density | g/cm3 | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 |
m p FePt | Mass per particle | g | 2.73 × 10−17 | 2.74 × 10−18 | 2.34 × 10−18 | 9.97 × 10−19 | 2.90 × 10−18 | 1.70 × 10−18 | 3.65 × 10−18 | 2.90 × 10−18 |
N a FePt | Total Fe + Pt atoms per particle | - | 65,453 | 6,573 | 5,611 | 2,391 | 6,964 | 4,076 | 8,749 | 6,964 |
N p Fe | Iron atoms per particle | - | 38289.9 | 3339.1 | 3540.5 | 1190.9 | 3913.8 | 2095.3 | 5048.1 | 3558.6 |
N p Pt | Platinum atoms per particle | - | 27162.9 | 3234.0 | 2070.4 | 1200.5 | 3050.3 | 1981.1 | 3700.8 | 3405.4 |
W L | Weight percent ligand | wt.% | 27.2 | 50.0 | 52.9 | 42.5 | 43.2 | 33.7 | 34.4 | 41.7 |
W FePt | Weight percent naked FePt | wt.% | 72.8 | 50.0 | 47.1 | 57.5 | 56.8 | 66.3 | 65.6 | 58.3 |
N p L | Number of ligands per mg SIPPs | Ligand/mg SIPP | 6.08 × 1017 | 1.12 × 1018 | 1.32 × 1018 | 1.06 × 1018 | 1.22 × 1018 | 9.52 × 1017 | 1.12 × 1018 | 1.36 × 1018 |
I FeOx | Intensity of iron oxide peak (TGA) | Deriv. wt.% °C | 0.091 | 0.068 | 0.033 | 0.047 | 0.054 | 0.019 | 0.000 | 0.000 |