EFFECT OF INORGANIC HYBRID LiBr ON THE SILICA MATRIX XEROGELS

The SiO2-LiBr hybrid porous materials were prepared by the sol-gel method. This process was obtained by the hydrolysis and condensation tetraethyl orthosilicate (TEOS) with replacement ofethanol from alcogel by drying at ambient temperature to obtain xerogel structure. The alcogelsamples were synthesized from TEOS, EtOH, H2O, HCl, NH4OH and LiBr. The total molar ratio of the compounds was 1: 9: 4: 8 x 10 -4, 8 x 10 -³. Xerogel contain 30 % wt of LiBr (dry matter) wasprepared and characterized by Scanning Electron Microscopy (SEM), Transmission ElectronMicroscopy (TEM), Furier Transmittance Infra Red (FTIR), Energy Dispersive X-ray (EDX) and Thermal Gravimetry Analysis (TGA ) systems . The results obtained from SEM were shown themicrograph of LiBr on the silica matrix. Chemical elemental analysis data was resulted by EDX. Onthe other hand, the TEM have confirmed average particle size of SiO2-LiBr about 50 nm and FTIRspectrum describes functional groups of nanocomposite. The thermal analysis of SiO2-LiBrnanocomposite was performed using TGA system. The results show that the suitable temperature for initial thermal treatment is about 200 °C.

کلیدواژه ها:

Inorganic hybrid ، Lithium bromide ، Silica ، Xerogel