Pore ordering in mesoporous matrices induced by different directing agents

Ana Maria Putz, Savii Cecilia, Cătălin Ianăşi, Zoltán Dudás, Kinga Noémi Székely, Jiri Plocek, Paula Sfârloagă, Liviu Săcărescu, László Almásy

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Abstract

Mesoporous silica particles of MCM-41 type were synthesized by sol–gel method from tetraethyl orthosilicate in 2-methoxyethanol and deionized water mixture in base conditions at room temperature. Ammonia or sodium hydroxides were used as catalysts and cetyl-trimethylammonium bromide and n-dodecyl-trimethylammonium bromide as structure directing agents. The porosities and the ordered structure have been analyzed using transmission and scanning electron microscopy, small angle neutron and X-ray diffraction, nitrogen adsorption, thermal analysis and FTIR spectroscopy. The samples consist of spherical particles of sub-micrometer size, with radially arranged pores. The comparison of the effect of the different surfactants and catalysts shows that by varying the surfactant type and their proportion, the pore sizes can be controlled. As compared to the commonly used ammonia catalyst, the use of NaOH as catalyst results in a much smaller porosity of the as-prepared materials. These materials are not resisting to the heat treatment at 700 °C used for the template removal, and the ordered porous structure is completely lost.

Original languageEnglish
Pages (from-to)321-331
Number of pages11
JournalJournal of Porous Materials
Volume22
Issue number2
DOIs
Publication statusPublished - Jan 1 2015

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Keywords

  • Dodecyl-trimethyl ammonium bromide
  • Hexadecyl-trimethylammonium bromide
  • MCM-41
  • Mesoporous silica

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Putz, A. M., Cecilia, S., Ianăşi, C., Dudás, Z., Székely, K. N., Plocek, J., Sfârloagă, P., Săcărescu, L., & Almásy, L. (2015). Pore ordering in mesoporous matrices induced by different directing agents. Journal of Porous Materials, 22(2), 321-331. https://doi.org/10.1007/s10934-014-9899-z