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Adsorption of Poly(rA) on the Carbon Nanotube Surface and its Hybridization with Poly(rU)
Author(s) -
Karachevtsev Victor A.,
Gladchenko Galyna O.,
Karachevtsev Maksym V.,
Valeev Vladimir A.,
Leontiev Victor S.,
Lytvyn Oksana S.
Publication year - 2008
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200800182
Subject(s) - carbon nanotube , polymer , stacking , adsorption , materials science , nanotube , polymer chemistry , chemical engineering , nanotechnology , chemistry , composite material , organic chemistry , engineering
Adsorption of poly(rA) on a single‐walled carbon nanotube surface in aqueous suspension and the subsequent hybridization of this polymer with free poly(rU) is studied. A comparison of the temperature dependence of the absorbance of free poly(rA) and poly(rA) adsorbed on the nanotube surface [poly(rA) NT ] at ν max =38 500 cm −1 shows that the thermostability of the adsorbed polymer is higher. Molecular dynamics simulations demonstrate that more than half of the adenines are not stacked on the tube surface and some of them undergo self‐stacking. After addition of a complementary poly(rU) to the poly(rA) NT suspension, a double‐stranded polymer is formed as confirmed by the characteristic S‐like form of its melting curve. However, the melting temperature of this polymer is lower than that of the free poly(rA)⋅poly(rU) duplex. This result indicates that poly(rU) hybridization with poly(rA) NT occurs with defects along the whole length of the polymer because of π–π stacking between nitrogen bases and the nanotube surface, which hinders the usual hybridization process. Computer modeling demonstrates different possible structures of hybridized polymers on the nanotube surface.