Manufacturing Strategy for Multiwalled Carbon Nanotubes as a Biocompatible and Innovative Material
Table 1
Basic properties of MWCNTs.
MWCNT type
MWCNT-150
Testing method
abbreviation name
NT15
NT15+Fe
NT15-30
NT15-26
NT15-22
NT15-13
Graphitization temperature (°C)
3000b
3000b
3000c
2600c
2200c
—
Additional treatment
—
—
—
—
—
Diameter (nm)
150
FE-SEM
Length (μm)
7–10
FE-SEM
Iron content (ppm)
34
730
<20
<20
60
13000
ICP-MS
value (/I)a
0.3
0.3
0.2
0.5
0.9
1.4
Raman spectroscopy (785 nm)
MWCNT type
MWCNT-80
Testing method
abbreviation name
NT08
NT08+Fe
NT08-30
NT08-26
NT08-22
NT08-13
Graphitization temperature (°C)
3000b
3000b
3000c
2600c
2200c
—
Additional treatment
—
—
—
—
—
Diameter (nm)
80
FE-SEM
Length (μm)
7–10
FE-SEM
Iron content (ppm)
1700
2200
<20
<20
360
21000
ICP-MS
value (/I)a
n/a
Raman spectroscopy (785 nm)
aR refers to the intensity of D band over the intensity of G band.
bMWCNTs were heated at Showa denko.
cMWCNTs were heated in our laboratory.
dNT15 and NT08 were added Fe2O3 (1000 : 1), mixed, and sonicated in 0.02% triton-X100 solution. Then, they were filtered and dried at 120°C. n/a = not available.