Vol. 21, No. 7, 2010
Rodrigues et al.
1347
reaction in the nanotubes. The new proton-rich phase can
10. Liu, A.; Wei, M.; Honma, I.; Zhou, H.; Anal. Chem. 2005, 77,
8068.
IV
dissociate releasing soluble Ti species to the medium.
IV
Consequently, the soluble Ti can react with the counter-
11. Ma, X.; Feng, C.; Jin, Z.; Guo, X.; Yang, J.; Zhang, Z.;
J. Nanopart. Res. 2005, 7, 681.
ion of the organic acid. For the phenylphosphonic acid, the
IV
Ti α-phenylphosphonate phase was obtained. In the case
12. Li, J.; Tang, Z.; Zhang, Z.; Electrochem. Commun. 2005, 7, 62.
13. Kasuga, T.; Hiramatsu, M.; Hoson, A.; Sekino, T.; Niihara, K.;
Langmuir 1998, 14, 3160.
of benzoic acid, on the other hand, the formation of anatase
TiO was probably due to the instability of the product given
2
IV
by benzoate and Ti , which could not precipitate.
14. Kasuga, T.; Hiramatsu, M.; Hoson, A.; Sekino, T.; Niihara, K.;
Adv. Mater. 1999, 11, 1307.
When the interaction between sodium titanate nanotubes
and organic acids was carried out at room temperature,
the stability of the nanotubes depended on the nature of
the acid. For the phenylphosphonic acid, the structure of
15. Zhang, S.; Peng, L. M.; Chen, Q.; Du, G. H.; Dawson, G.; Zhou,
W. Z.; Phys. Rev. Lett. 2003, 91, 256103.
16. Ferreira, O. P.; Souza Filho, A. G.; Mendes Filho, J.; Alves, O.
L.; J. Braz. Chem. Soc. 2006, 17, 393.
IV
Ti α-phenylphosphonate was formed, and the reaction
was favored by the contact time. However, for benzoic acid,
the morphology and structure of the nanoparticles were
maintained, but their chemical composition was modified.
After the reactions, the organic counter-ion adsorbed on the
surface of the final products. Furthermore, the Na-TiNT
basic character was revealed by its weak interaction with
aniline.
17. Pradhan, S. K.; Mao, Y.; Wong, S. S.; Chupas, P.; Petkov, V.;
Chem. Mater. 2007, 19, 6180.
18. Umek, P.; Cevc, P.; Jesih, A.; Gloter, A.; Ewels, C. P.; Arcon,
D.; Chem. Mater. 2005, 17, 5945.
19. Langhuan, H.; Zhongxin, S.;Yingling, L.; J. Ceram. Soc. Jpn.
2007, 115, 28.
20. Zhu, H.Y.; Lan,Y.; Gao, X. P.; Ringer, S. P.; Zheng, Z. F.; Song,
D. Y.; Zhao, J. C.; J. Am. Chem. Soc. 2005, 127, 6730.
21. Tsai, C.-C.; Teng, H.; Chem. Mater. 2006, 18, 367.
Acknowledgments
2
2. Bavykin, D. V.; Friedrich, J. M.; Lapkin, A. A.; Walsh, F. C.;
Financial support from FAPESP and CNPq is
acknowleged. The authors are indebted to Dr. Carlos
A. P. Leite for assistance with the TEM images, and to
Prof. Antonio G. Souza Filho (Departamento de Física/
Universidade Federal do Ceará, Brazil) for a critical
reading of the manuscript. This is a contribution of the Rede
Nacional de Pesquisa em Nanotubos (MCT/CNPq) and the
National Institute of Science, Technology and Innovation
in Functional Complex Materials (INOMAT).
Chem. Mater. 2006, 18, 1124.
23. Nian, J. N.: Teng, H.; J. Phys. Chem. B 2006, 110, 4193.
24. Morgado, E.; deAbreu, M.A. S.; Pravia, O. R. C.; Marinkovic,
B.A.; Jardim, P. M.; Rizzo, F. C.;Araujo,A. S.; Solid State Sci.
2006, 8, 888.
25. Zhang, C.; Jiang, X.; Tian, B.; Wang, X.; Zhang, X.; Du, Z.;
Colloids Surf., A 2005, 257, 521.
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J. Chromatogr., A 2007, 1172, 113.
2
7. Shi, Z.; Xueping, G.; Deying, S.; Zhou, Y.; Yan, D.; Polymer
2007, 48, 7516.
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