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O. HOROVITZ, M. TOMOAIA-COTIŞEL, C. RACZ, GH. TOMOAIA, L.-D. BOBOŞ, A. MOCANU CONCLUSIONS A stable silver colloidal solution was prepared and characterized by UV-Vis spectroscopy and TEM imaging. By means of these techniques the self-aggregation of silver nanoparticles is evidenced, the process being induced by α-lipoic acid. Functionalization of silver nanoparticles through biomolecules is important for the development of new biomaterials with implications in nanoscience and nanotechnology. EXPERIMENTAL SECTION The colloidal silver solution was prepared by a method adapted from [11]. 125 mL of 0.001 M solution of silver nitrate in water was heated until boiling under continuous magnetic stirring. Then 5 mL of 1% sodium citrate solution was added and the heating continued until the color was pale yellow. The solution was then rapidly cooled on ice to room temperature. The solution of colloidal silver particles was stored in brown bottles and kept at 4 o C. The silver content of the solution is 104 mg/L. AgNO3 was purchased from Merck (high purity above 99.5 %). The trisodium citrate dihydrate was obtained from Sigma Aldrich (high purity above 99%). α-Lipoic acid (extrapure) was purchased from Jiangsu Chemical Company – China, and its 0.01 M solution in ethanol was prepared. All aqueous solutions were prepared using deionized water with resistivity of 18 MΩ·cm, obtained from an Elgastat water purification system. The UV/Vis absorption spectrum of the solutions was studied using a Jasco UV/Vis V-530 spectrophotometer, with 10 mm path length quartz cuvettes in the 190 – 900 nm wavelengths range. The silver nanoparticles suspension (7 μL), in the absence and in the presence of lipoic acid, was deposited for 30 s on the carbon coated specimen grid and observed with a transmission electron microscope (TEM: JEOL – JEM 1010). TEM images have been recorded with a JEOL standard software ACKNOWLEDGMENTS This research had financial support from PN2 grant no.41-050. We thank chemist Ancuţa Ureche for her contribution to the experimental work. REFERENCES 1. Z. Wang, S. Pan, T.D. Krauss, H. Du, L. J. Rothberg, Proceedings of the National Academy of Sciences of the USA, 2003, 100, 8638. 2. P. Matejka, B. Vlckova, J. Vohidal, P. Pancoska, V.J. Baumrunk, Journal of Physical Chemistry, 1992, 96,1361. 94
THE INTERACTION OF SILVER NANOPARTICLES WITH LIPOIC ACID 3. M. P. Plieni, A. Taleb, C. J. Petit, Journal of Dispersion Science and Technology, 1998, 19 (2 and 3), 185. 4. Z. Zhang, R. C. Patel, R. Kothari, C. P. Johnson, S. E. Friberg, P. A. Aikens, Journal of Physical Chemistry B, 2000, 104, 1176. 5. R. B. Bright, M. D. Musick, M. J. Natan, Langmuir, 1998, 14, 5695. 6. R. C. Doty, H. Yu, C. K. Shih, B. A. Korgel, Journal of Physical Chemistry B, 2001, 105, 8291. 7. M. Kerker, Journal of Colloid and Interface Science, 1985, 105, 297. 8. Q. L. Feng, J. Wu, G. Q. Chen, F. Z. Cui, T. N. Kim, J. Kim, Journal of Biomedical Materials Research, 2000, 52, 662. 9. I. Sondi, B. Salopek-Sondi, Journal of Colloid and Interface Science, 2004, 275, 177. 10. Z. S. Pillai, P. V. Kamat, Journal of Physical Chemistry B, 2004, 108, 945. 11. P. V. Kamat, M. Flumiani, G. V. Hartland, Journal of Physical Chemistry B, 1998, 102, 3123. 12. A. Henglein, M. Giersig, Journal of Physical Chemistry B, 1999, 103, 9533. 13. S. Basu, S. Jana, S. Pande, T. Pal, Journal of Colloid and Interface Science, 2008, 321, 288. 14. Y.-H. Wang, J. Zhou, T. Wang, Chinese Journal of Inorganic Chemistry, 2007, 23, 1485. 15. P.-Y. Silvert, R. Herrera-Urbina, N. Duvauchelle, V. Vijayakrishnan, K. J. Tekaia- Elhissen, Journal of Materials Chemistry, 1996, 6, 573. 16. Y. Sun, Y. Xia, Science, 2002, 298, 2176. 17. C. Chen, L. Wang, G. Jiang, H. Yu, Reviews on Advanced Materials Science, 2006, 11, 1. 18. M. H. Ullah, I. Kim, C.-S. Ha, Journal of Nanoscience and Nanotechnology, 2006, 6, 777. 19. I. Pastoriza-Santos, L. M. Liz-Marzán, Langmuir, 1999, 15, 948. 20. I. Pastoriza-Santos, C. Serra-Rodríguez, L. M. Liz-Marzán, Journal of Colloid and Interface Science, 2000, 221, 236. 21. I. Pastoriza-Santos, L. M. Liz-Marzán, Pure and Applied Chemistry, 2000, 72, 83. 22. A. Manna, T. Imae, M. Iida, N, Hisamatsu, Langmuir, 2001, 17, 6000. 23. I. Hussain, M. Brust, A .J. Papworth, A. I. Cooper, Langmuir, 2003, 19, 4831. 24. K. C. Bhainsa, S. F. D'Souza, Colloids and Surfaces B: Biointerfaces, 2006, 47, 160. 25. J. P. Abid, A. W. Wark, P .F. Breevt, H. H. Girault, Chemical Communications (Cambridge), 2002 (7), 792. 26. A. Henglein, Chemistry of Materials, 1998, 10, 444. 27. R. T. Tom, A. K. Samal, T. S. Sreeprasad, T. Pradeep, Langmuir, 2007, 23, 1320. 95
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ANA-MARIA CORMOS, JOZSEF GASPAR, AN
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Studia Universitatis Babes-Bolyai C
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6 PROFESSOR IOAN BÂLDEA AT HIS 70
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MARCELA ACHIM, DANA MUNTEAN, LAURIA
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STUDIA UNIVERSITATIS BABEŞ-BOLYAI,
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STUDIES ON WO3 THIN FILMS PREPARED
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PREPARATION AND CHARACTERIZATION OF
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C. CĂŢĂNAŞ, M. MOGOŞ, D. HORVA
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38 ANA-MARIA CORMOS, JOZSEF GASPAR,
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CONCLUSIONS 148 CRISTINA MIHALI, GA
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