Fractal Studies on Titanium-Silica Aerogels using SMARTer


Power-law scattering approximation has been employed to reveal the fractal structures of solid-state titanium-silicaaerogel samples. All small-angle neutron scattering (SANS) measurements were performed using 36 meters SANSBATAN spectrometer (SMARTer) at the neutron scattering laboratory (NSL) in Serpong, Indonesia. The mass fractaldimension of titanium-silica aerogels at low scattering vector q range increases from -1.4 to -1.92 with the decrease ofacid concentrations during sol-gel process. These results are attributed to the titanium-silica aerogels that are growing tomore polymeric and branched structures. At high scattering vector q range the Porod slope of -3.9 significantly down to-2.24 as the roughness of particle surfaces becomes higher. The cross over between these two regimes decreases from0.4 to 0.16 nm,l with the increase of acid concentrations indicating also that the titanium-silica aerogels are growing.Keywords: SANS, aerogels, fractals, power-law scatteringPACS: 25.40. Dn, 82.70. Gg, 83.85. Hf. E. Giri Rachman Putral, A. lkram\ Bharotol, E. Santosol, T. Chiar Fang2,N. Ibrahim2, A. Aziz Mohamed31 Neutron Scattering Laboratory, BATAN, Kawasan Puspiptek Serpong, Tangerang 15314, Indonesia2 Department of Physics, Faculty of Science Universiti Teknologi Malaysia (UTM), 81310 Skudai, lohor, Malaysia3 Materials Technology Group, Industrial Technology Division Agensi Nuklear Malaysia, 43000 Kajang, Malaysia