Mesoporous silica obtained with methyltriethoxysilane as co-precursor in alkaline medium

0478870 - ÚACH 2018 RIV NL eng J - Journal Article
Putz, A.-M. - Wang, K. - Len, A. - Plocek, Jiří - Bezdička, Petr - Kopitsa, G. P. - Khamova, T. V. - Ianasi, C. - Sacarescu, L. - Mitróová, Z. - Savii, C. - Yan, M. - Almásy, L.
Mesoporous silica obtained with methyltriethoxysilane as co-precursor in alkaline medium.
Applied Surface Science. Roč. 424, SI 3 (2017), s. 275-281. ISSN 0169-4332. E-ISSN 1873-5584.
[International Conference on Physics of Advanced Materials (ICPAM) /9./. Cluj Napoca, 08.09.2016-14.09.2016]
Institutional support: RVO:61388980
Keywords : Sol-gel process * mtes/teos * Hydrophobic silica * mcm-41
OECD category: Inorganic and nuclear chemistry
Impact factor: 4.439, year: 2017

Mesoporous silica particles have been synthesized by sol-gel method from tetraethoxysilane (tetraethylorthosilicate, TEOS) and methyltriethoxysilane (MTES), in ethanol and water mixture, at different ratios of the of the silica precursors. Ammonia was used as catalyst at room temperature and hexadecyltrimethylammonium bromide (cetyltrimethylammonium bromide, CTAB) as the structure directing agent. Nitrogen sorption, X-ray diffraction and small-angle neutron scattering gave information on the evolution of the gel structure and pore morphologies in the function of MTES/TEOS molar ratio. Thermogravimetric and differential thermal analysis showed that with addition of MTES the exothermic peak indicating the oxidation of the low molecular weight organic fragments shift to higher temperature. A room-temperature, one-pot synthesis of MCM-41 type materials is presented, in which the variation of the MTES concentration allows to change the hydrophobicity, preserving the specific properties materials, like the ordered pore structure, large specific surface area and high porosity. Specifically, the obtained materials had cylindrical pores, specific surface areas up to 1101 m2/g and total pore volumes up to 0.473 cm/g. The obtained mesoporous materials are susceptible for further functionalization to improve their selective uptake of guest species in drug delivery applications.
Permanent Link: http://hdl.handle.net/11104/0274925