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OBSERVATION OF UV-VIS ABSORPTION PROPERTIES OF SOME PVA MEMBRANES WITH … spontaneous formation of silver nanoparticles or scission of agglomeration of such systems. EXPERIMENTAL SECTION The aqueous PVA membrane had a polymer concentrations 20% in initial state, to which 0,04 ml AgNPs was added. The PVA was obtained by mixing the polymer with distilled water at 55 0 C for 3 hours, until a homogeneous dispersion was obtained. A 10-mL volume of 1.0 mM silver nitrate was added dropwise (about 1 drop/second) to 30 mL of 2.0 mM sodium borohydride solution that had been chilled in an ice bath. The mixture was stirred vigorously on a magnetic stirrer. The solution turned light yellow after the addition of 2 mL of silver nitrate and a brighter yellow when all of the silver nitrate had been added. The entire addition took about three minutes, after which the stirring was stopped and the stir bar removed. These samples were analyzed in their original state and after UV and gamma exposure. UV irradiation was achieved with a VL 215 G lamp at 254 nm and 76 mW/cm 2 . The gamma exposure was performed using a 60 Co source for different time intervals corresponding to 739 Gy and 2217 Gy. The UV-vis spectra were measured with a Jasco V-670 system with scan speed 200 nm/min, UV-vis bandwidth 2 nm, and NIR bandwidth 8 nm. ACKNOWLEDGMENT Luciana Udrescu acknowledges financial support from a program co-financed by The SECTORAL OPERATIONAL PROGRAMME HUMAN RESOURCES DEVELOPMENT, Contract POSDRU 6/1.5/S/3 – „Doctoral studies: through science towards society". REFERENCES 1. E. E. Shafee, H. F. Naguib, Polymer, 2003, 44, 1647 2. W. Li, F. Xue, R. Cheng, Polymer, 2005, 46, 12026 3. H. Trieu, S. Qutubuddin, Polymer, 1995, 36, 2531 4. G. Paradossi, F. Cavalieri, E. Chiessi, C. Spagnoli, M. K. Cowman, Journal of Materials Science: Materials in Medicine, 2003, 14, 687 5. H. Kaczmarek, A. Podgorski, Journal of Photochemistry and Photobiology A: Chemistry, 2007, 191, 209 6. N. C. Koon, D. Weber, P. Penrsson, A. I. Shindler, Materials Research Society Symposium Proceedings 1984, 27, 445 183
LUCIANA UDRESCU, BOGDAN MARTA, MIHAELA POP, CORNEL VIOREL POP, TRAIAN STEFAN, ET ALL 7. P. E. Rehrsson, D. C. Weber, N. C. Koon, J. E. Campana, S. L. Rose, Materials Research Society Symposium Proceedings, 1984, 27, 429 8. P. P. Townsed, P. J. Chandler, L. Zhang, “Optical Effects of Ion Implantation”, Cambridge University press, Cambridge, 1994. 9. K. A. M Abd El-Kader, S. F. Abdel Hamied, Journal of Applied Polymer Science, 2002, 86, 1219 10. R. Jayasekara, I. Harding, I. Bowater, G. B. Y Christie, G. T. Lonergan, Polymer Testing, 2004, 23, 17 11. M. Potara, A. Gabudean, S. Astilean, Journal of Materials Chemistry, 2011, 21, 3625 12. Y. Badr, M. A. Mahmoud, Journal of Materials Science, 2006, 41, 3947 13. A. M. Whelan, M. E. Brenann, W. J. Blau, J. M. Kelly, Journal of Nanoscience and Nanotechnology, 2004, 4, 66 14. W. H. Eisa, Y. K. Abdel-Moneam, Y. Shaaban, A. A. Abdel-Fattah, A. M. Abou Zeid, Materials Chemistry and Physics, 2011, 128, 109 184
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CHEMIA 3/2011
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CORINA COSTESCU, LAURA CORPAŞ, NIC
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Studia Universitatis Babes-Bolyai C
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MONICA BAIA, MONICA SCARISOREANU, I
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STUDIA UBB CHEMIA, LVI, 3, 2011 (p.
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PREPARATION, CHARACTERIZATION AND S
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SPECTROSCOPIC EVIDENCE OF COLLAGEN
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CORNEL-VIOREL POP, TRAIAN ŞTEFAN,
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VITALY ERUKHIMOVITCH, IGOR MUKMANOV
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DUMITRU GEORGESCU, ZSOLT PAP, MONIC
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MAHDIEH AZARI, ALI IRANMANESH DEFIN
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MAHDIEH AZARI, ALI IRANMANESH V ( G
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MAHDIEH AZARI, ALI IRANMANESH Now,
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MAHDIEH AZARI, ALI IRANMANESH Let T
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MAHDIEH AZARI, ALI IRANMANESH Let G
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MAHDIEH AZARI, ALI IRANMANESH ACKNO
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CRISTINA GRUIAN, HEINZ-JÜRGEN STEI
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CYCLODEXTRINS AND SMALL UNILAMELLAR
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CYCLODEXTRINS AND SMALL UNILAMELLAR
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PROTEIN ADHESION TO BIOACTIVE MICRO
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LC/MS ANALYSIS OF STEROLIC COMPOUND
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LC/MS ANALYSIS OF STEROLIC COMPOUND
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INVESTIGATION OF THE EFFECTS OF DEG
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PM3 CONFORMATIONAL ANALYSIS OF THE
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MIHAELA POP, STEFAN TRAIAN, LIVIU D
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EMILIA VANEA, SIMONA CAVALU, FLORIN
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ANDRA TĂMAŞ, MARTIN VINCZE The ma
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ANDRA TĂMAŞ, MARTIN VINCZE 2%B +
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ANDRA TĂMAŞ, MARTIN VINCZE increa
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EFFECT OF CATALYST LAYER THICKNESS
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SPECTRAL INVESTIGATIONS AND DFT STU
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TOPOLOGICAL SYMMETRY OF TWO FAMILIE
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TOPOLOGICAL SYMMETRY OF TWO FAMILIE
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NEW 1-AZABICYCLO[3.2.2]NONANE DERIV
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