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Chromatographic Purification and Properties of Soluble Single-Walled
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Chromatographic Purification and Properties of Soluble Single-Walled
Carbon Nanotubes
Bin Zhao, Hui Hu, Sandip Niyogi, Mikhail E. Itkis, Mark A. Hamon
Paragranjita Bhowmik, Mark S. Meier, and Robert C. Haddon
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Experimental Section
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Chromatography
Method
- THF as mobile phase with 0.5ml/min flow rate
- s-SWNT samples were dissolved in THF
- Starting concentrations solution: 0.5g mg/ml
- 50μL was injected into Waters 600-996 chromatograph fitted with a PLgel 20 µm MIXED-A
column (300 mm × 7.5 mm).
Finding
- Shows the elution of three bands with a retention time - First band: about 8 min, and the second band followed immediately. The third band appeared around 19 min.
Objective
To improve the purification of SWNT by using high-performance liquid chromatography (HPLC) using a PLgel MIXED-A column
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Fraction 1
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- Raman radial (ωr) 170 cm-1
- Tangential modes (ωt) 1589 cm-1
- Similar to SWNT raw soot and shortened SWNTs
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- Bruker RFS100/S FT spectrometer
- Laser excitation at 1064 nm
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- Nicolet Magna-IR 560 E.S.P. spectrometer in THF
- 10 mm path length of quartz cell
- No resonance at 170 and 1589 cm-1
- Does not contain SWNTs
- No resonance at 170 and 1589 cm-1
- Does not contain SWNTs
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- 5400 cm^-1 (0.67eV) & 10 000 cm^-1(1.3
eV)
- Assigned to 1st pairs & 2nd pairs of density of states for s-SWNTs
- From Beer’s Law the yield of s-SWNTs is estimated to be 74%
- Column Dimension
- Effective MW Range
- Particle Size
- Flow Rate