Nanotechnology for domestic water purification - Nanotechnology in Eco-efficient Construction - page 409

(e)

(a)

O
C

O
C

O
C

O
C

O
C

O
C

O
C

O
C

NH 2

(b)

NH 2

(c)

HO 3 S

SO 3 H

NN NN NN

HO

SO 3 H NH 2

(d)

SO 3 H

O

NH

H H

4

16.14 Functionalization of the CNT membrane via coupling chemistry between amine groups (circled) of the
functional molecule and the carboxylic acid with (a) short (C9)-chain amine, (b) long (C22)-chain amine,
(c) charged dye molecule with SO 3 2 − groups, and (d) long-chain polypeptide resulting in change of transport
properties through the CNT membrane (e). Figures (a)-(e) adapted with permission from Majumder et al. , (2005a).
These experiments indicate the feasibility of functionalizing CNT membranes and should offer avenues for
imparting antifouling, biocompatible, molecular recognition or selective adsorption properties, whenever desired.