The role of decylamine template of the size control on mesoporous materials

Author(s): Mohamed A.Betiha, Mohamed F.Menoufy, Maged S.Ghattas, Hussien Abd El-aziz, Essam M.Ezzo

The low-temperature formation of liquid-crystal-like arraysmade up ofmolecular complexe formed between molecular inorganic species (TEOS) and neutral organic molecule (Decylamine) is a convenient approach for the synthesis of mesostructure materials. Mesoporous silicates structure with controlled pore sizes (2– 4 nm) were successfully synthesized from tetraethoxysilane (TEOS) usingmixture of decylamine (DA) as template and different organic solvent (ethanol, 1,4-dioxan or benzene). The auxiliarymixture of DA and TEOS act as a swelling agent for DA and functionalized silica. By adjusting the initialmolar ratio of DA/TEOS from(0.252 - 0.166), pore and the particle sizes of the final disordered hexagonal mesoporous silicas could be precisely tuned in the ranges of 2-4 nm and 320 -540 nm respectively. Solvent structure direction can be effectively used to control the surface area and the pore size by varying their polarity. Results show that the hydrogen bonds between the condensed silica and NH2 group using different solvents, disordered hexagonal structure of mesostructured silica was obtained at different concentration of NH2. The HMS samples were characterized using thin film X-ray, N2 adsorption–desorption, scanning electron microscopy (SEM), and transmission electron microscopy (TEM).

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