Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 19, No. 1 (December 2006) 53-60   

downloaded Downloaded: 70   viewed Viewed: 1532

  PREPARATION AND STUDY OF MOLECULAR STRUCTURE OF COPPER IONS DOPED IN A SILICA XEROGEL MATRIX
 
S. H. Tohidi* and A. J. Novinrooz

Material and Ion Beams Division, Nuclear Research Center for Agriculture and Medicine
AEOI, P.O. Box 31485/498, Karaj, Iran
htohidi2003@yahoo.com

M. Derhambakhsh

Shahd Scientific Institute
P.O. Box 141557517, Tehran, Iran
mderhambakhsh@yahoo.com

*Corresponding Author


 
( Received: August 27, 2005 – Accepted in Revised Form: August 09, 2006 )
 
 

Abstract    The silica xerogel is prepared using copper source; 0.02 mol of Cu(NO3)2.3H2O that has been added to 1 mol TEOS (tetraethyl orthosilicate). The Copper ions are doped to silica matrix by the sol gel method and determination of total molar ratio of components with a reported molar ratio of H2O /TEOS(R) = 6.2. In this method, the acidity the of reaction (pH) depends on the catalyst type in the hydrolysis step and the molar ratio of H2O /TEOS (R) that is studied with gelation time (tg). In this reaction, acidity varies between 2.4 and 3.5. Average size and molecular structure of this nanocomposite were analyzed using TEM, FTIR and XRD. Copper oxide can be produced from the decomposition of copper nitrate and is doped on the silica matrix by thermal treatment.

 

Keywords    Sol Gel Process, Copper (II) ions, Xerogel Matrix

 

References   

1. Brinker, C. J. and Scherer, G., “The physics and chemistry of sol gel processing”, Sol Gel Science, Academic Press, San-Diago, (1989).

2. Zelinski, B. J. J., and Ulhmann, D. R., “Gel technology in ceramics”, J. Phy. Chem. Solids, 45, (1984), 1069-1090.

3. Schmidt, H., “Inorganic-Organic composites by sol gel technology”, Mat. Res. Soc. Symp. Proc., 3, (1990), 171-175.

4. Sanchez, C., Babonneau, F., Banes, F., Doeff-Barboux, S. and Ribot, F., "Chemistry of hybrid organic-inorganic materials synthesized via sol-get", Mat. Science Forum, 313, (1994), 153-162.

5. Yan, J., Buckley, A. M. and Greenblatt, M., “The preparation and characterization of Silica gels”, J. Non-Cryst. Solids, 180, (1995), 180-190.

6. Dasilva, M. G. F. and Fernandez Navarro, J. M., “Color of Silicate sol gel glasses containing CuO”, J. Non-Cryst. Solids, 100, (1988), 447-452.

7. Buckley, A. M. and Greebblatt, M., “The preparation and characterization of silica aerogels and xerogels doped with transition metal species”, J. Non-Cryst. Solids, 146, (1992), 97-110.

8. Celzard, A., “Application of the sol gel process using welltested recipes”, J. Chem. Educ., 79, (2002), 854-859.

9. Sen, P. and Thorpe, M. F., “phonons in AX2 glasses: from molecular to band-like modes ”, Phys. Rev., B15, (1977),

4030-4038.

10. Galneer, F., “Band limits and the vibrational spectra of tetrahedral glasses”, Phys. Rev., B15, (1979), 4292-4296.

11. Martinez, J. R., Ruiz, F., Vorobiev, Y. V and Gonzalez-Hernandez, J., “Infrared spectroscopy analysis of the local atomic structure in silica prepared by sol-gel”, J. Chem. Phys., 109, (1998), 7511-7514.

12. Martinez, J. R, Ruiz, F., Gonzalez-Chavez, M. M and Valle-Aguilera, A., “Mapeo structural de silica xerogel utilizando espectroscopia”, Rev. Mex. Fis., 44, (1998), 575-581.

13. Serna, C., Fornes, V and Fernandez-Navarro, J. M., “Sol gel transition in simple Silicate”, J. Non-Cryst. Solids, 63, (1984), 45-59.

14. Dudley, H. W. and Fleming, I., “Spectroscopic methods in organic chemistry”, Fourth Edition, McGraw-Hill, (1987).

15. Ogale, S. B., Bilukar, P. G., Mate, N., SKanetkar, M., Parikh, N. and Patnaik, M., “Formation of copper-based particles trapped in silica xerogel”, J. Appl. Phys., 72, (1992), 3765-3772.

16. International Center for Diffraction Data, Inorganic Phases, Academic press, New York, (1993).

17. Aelion, R., Loebel, A. and Eirich, A., "Hydrolysis of Ethyl Silicate", J. Am. Chem. Soc., 72, (1950), 5705-5712, Grubb, W. T., Ibid, 76, (1954), 3408-3413.

18. Hench, L. L. and West, J. K., “The sol gel process”, Chem. Rev., 90, (1990), 33-72.





International Journal of Engineering
E-mail: office@ije.ir
Web Site: http://www.ije.ir