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Table 3 Characterization using a Knudsen flow reactor of the surface functional groups present on the multi-walled carbon nanotubes (MWCNT)

From: Coating carbon nanotubes with a polystyrene-based polymer protects against pulmonary toxicity

MWCNT

Gas

[gas-phase probe molecules]

N(CH 3 )3

[acidic sites]

HCl

[basic sites]

CF 3 COOH

[basic sites]

NH 2 OH

[carbonyl functions]

O3

[oxidisable sites]

NO2

[oxidisable sites]

NT1

N°/mg a

3.0 · 1015

8.1 · 1016

2.4 · 1016

2.4 · 1017

3.9 · 1018

1.2 · 1016

 

N°/cm 2 b

1.32 · 1012

35.6 · 1012

10.6 · 1012

105.5 · 1012

1715 · 1012

5.3 · 1012

NT2

N°/mg a

6.4 · 1015

4.4 · 1016

5.9 · 1015

3.4 · 1017

1.8 · 1017

1.2 · 1015

 

N°/cm 2 b

11.8 · 1012

81.3 · 1012

1.1 · 1012

628.5 · 1012

332.7 · 1012

2.2 · 1012

NT3

N°/mg a

2.6 · 1014

1.4 · 1016

5.8 · 1014

2.0 · 1017

1.1 · 1018

1.9 · 1015

 

N°/cm 2 b

0.8 · 1012

41.2 · 1012

1.7 · 1012

588 · 1012

3235 · 1012

5.6 · 1012

  1. aNumber of probe molecules taken up per mg of deposited nanoparticles.
  2. bNumber of probe molecules taken up per square cm of MWCNT (no/cm2), using the BET surface as a surface metric.
  3. NT1, uncoated MWCNT; NT2, MWCNT coated with carboxylic polyacid polymer; NT3, MWCNT coated with polystyrene polybutadiene polymethylacrylate polymer.