An investigation on structure and texture of silica-magnesia xerogels

  • Rodrigo Brambilla
  • Cláudio Radtke
  • João H. Z. Dos Santos
  • Márcia S. L. Miranda
Original Paper


Silica-magnesia xerogels were prepared by reacting tetraethoxysilane (TEOS) and magnesium chloride (MgCl2) under acidic conditions. The TEOS/MgCl2 molar ratio was varied from 1:0 to 0:1. The xerogels were characterized by a set of complementary techniques, namely, Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), nitrogen adsorption, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). Magnesium contents of silica-magnesia xerogels were between 1.3 and 16.0 wt%. Increasing TEOS/MgCl2 molar ratio affords higher homogeneity and crystallinity. The presence of low Mg content (<5%) increases specific surface area compared to bare silica. A cubic grain morphology was observed for xerogels with higher Mg content.


Silica-magnesia Mixed oxide Xerogel Sol–gel 



CNPq is thanked for the grant. Capes and FAPERGS are thanked for partial financing.


  1. 1.
    Mitchell MBD, Jackson D, James PF (2003) J Sol-Gel Sci Technol 26:777. doi: 10.1023/A:1020722926865 CrossRefGoogle Scholar
  2. 2.
    Kalampounias AG, Bouropoulos N, Katerinopoulou K, Yannopoulos SN (2008) J Non-Cryst Solids 354:749. doi: 10.1016/j.jnoncrysol.2007.07.076 CrossRefADSGoogle Scholar
  3. 3.
    Brew DMR, Glasser FP (2005) Cement Concr Res 35:77. doi: 10.1016/j.cemconres.2004.03.016 CrossRefGoogle Scholar
  4. 4.
    Park HW, Chung JS, Baeck S-H, Song IK (2006) J Mol Catal Chem 255:69. doi: 10.1016/j.molcata.2006.04.004 CrossRefGoogle Scholar
  5. 5.
    Llanos ME, Lopez T, Gomez R (1997) Langmuir 13:974. doi: 10.1021/la950805y CrossRefGoogle Scholar
  6. 6.
    Mitra S, Sampath S (2002) J Mater Chem 12:2531. doi: 10.1039/b201599b CrossRefGoogle Scholar
  7. 7.
    López T, Llanos ME, Navarrete J, Schifter I, Salas P, Gómez R (1997) J Sol-Gel Sci Technol 8:321Google Scholar
  8. 8.
    López T, Gómez R, Llanos ME, López-Salinas E (1999) Mater Lett 38:283. doi: 10.1016/S0167-577X(98)00174-8 CrossRefGoogle Scholar
  9. 9.
    López T, Gómez R, Llanos ME, García-Figueroa E, Navarrete J, López-Salinas E (1999) Mater Lett 39:51. doi: 10.1016/S0167-577X(98)00216-X CrossRefGoogle Scholar
  10. 10.
    Lin L, Min Y, Chaoshu S, Weiping Z, Baogui Y (2006) J Rar Earths 24:104. doi: 10.1016/S1002-0721(07)60334-2 CrossRefGoogle Scholar
  11. 11.
    Curran MD, Stiegman AE (1999) J Non-Cryst Solids 249:62. doi: 10.1016/S0022-3093(99)00237-9 CrossRefADSGoogle Scholar
  12. 12.
    Healy TW (2006) In: Bergna HE (ed) Collodal silica: fundamentals and applications. CRC Press, New YorkGoogle Scholar
  13. 13.
    Manriquez ME, Lopez T, Gomez R (2003) J Sol-Gel Sci Technol 26:853. doi: 10.1023/A:1020759902274 CrossRefGoogle Scholar
  14. 14.
    Vansant EF, Van der Voort P, Vrancken KC (1995) Characterization and chemical modification of the silica surface. Elsevier, AmsterdamGoogle Scholar
  15. 15.
    Brew DRM, Glasser FP (2005) Cement Concr Res 35:85. doi: 10.1016/j.cemconres.2004.06.022 CrossRefGoogle Scholar
  16. 16.
    Brambila R, Pires GP, dos Santos JHZ, Miranda MSL, Chornik B (2007) J Electr Spectr Relat Phenom 156–158:413. doi: 10.1016/j.elspec.2006.12.053 CrossRefGoogle Scholar
  17. 17.
    Khairallah F, Glisenti A (2007) J Mol Catal Chem 274:137. doi: 10.1016/j.molcata.2007.04.039 CrossRefGoogle Scholar
  18. 18.
    Douy A (2002) J Sol-Gel Sci Technol 24:221. doi: 10.1023/A:1015332607551 CrossRefGoogle Scholar
  19. 19.
    Mizutani T, Fukushima Y, Okada A, Kamigaito O (1991) Clay Miner 26:441. doi: 10.1180/claymin.1991.026.3.14 CrossRefGoogle Scholar
  20. 20.
    Levien L, Prewitt CT, Weidner DJ (1980) Am Mineral 65:920Google Scholar
  21. 21.
    Parise JB, Leinenweber K, Weidner DJ, Tan K, Von Dreele RB (1994) Am Mineral 79:193Google Scholar
  22. 22.
    Kashani-Nejad S, Ng KW, Harris R (2004) Met Mater Trans B 35:406. doi: 10.1007/s11663-004-0043-3 CrossRefGoogle Scholar
  23. 23.
    Gregg SJ, Sing KW (1982) Adsorption, surface area and porosity. Academic, New YorkGoogle Scholar
  24. 24.
    Brinker CJ, Scherer GW (1990) Sol-gel science. Academic Press, New YorkGoogle Scholar
  25. 25.
    Zdravkov BD, Čermák JJ, Šefara M, Janků J (2007) Central European J Chem 5(2):385CrossRefGoogle Scholar
  26. 26.
    Hoang GC (1997) J Korean Phys Soc 31:227Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Rodrigo Brambilla
    • 1
  • Cláudio Radtke
    • 1
  • João H. Z. Dos Santos
    • 1
  • Márcia S. L. Miranda
    • 2
  1. 1.Instituto de QuímicaUFRGSPorto AlegreBrazil
  2. 2.Braskem S.A.III Pólo PetroquímicoTriunfoBrazil

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