Fractal studies on titanium-silica aerogels using SMARTer
Power-law scattering approximation has been employed to reveal the fractal structures of solid-state titanium-silica aerogel samples. All small-angle neutron scattering (SANS) measurements were performed using 36 meters SANS BATAN spectrometer (SMARTer) at the neutron scattering laboratory (NSL) in...
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| Main Authors: | , , , , , , |
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| Format: | Book Section |
| Published: |
American Institute of Physics
2008
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| Subjects: | |
| Online Access: | http://eprints.utm.my/id/eprint/12571/ http://dx.doi.org/10.1063/1.2906047 |
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| Institution: | Universiti Teknologi Malaysia |
| Summary: | Power-law scattering approximation has been employed to reveal the fractal structures of solid-state titanium-silica aerogel samples. All small-angle neutron scattering (SANS) measurements were performed using 36 meters SANS BATAN spectrometer (SMARTer) at the neutron scattering laboratory (NSL) in Serpong, Indonesia. The mass fractal dimension of titanium-silica aerogels at low scattering vector q range increases from -1.4 to -1.92 with the decrease of acid concentrations during sol-gel process. These results are attributed to the titanium-silica aerogels that are growing to more 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 from 0.4 to 0.16nm-1 with the increase of acid concentrations indicating also that the titanium-silica aerogels are growing. |
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