Answers are grounded in this paper and cite their sources.
We have developed a realistic model for silica aerogels based on a diffusion-limited cluster-cluster aggregation model in three dimensions with a primary particle represented by a sample of vitreous silica given by molecular dynamics simulations. Using the spectral moments method, with more than 30 000 computed moments, we calculated the densities of states and the dynamic structure factors of a simulated sample of silica aerogels of different macroscopic densities. We reproduce the vibration spectra experimentally obtained on basic silica, with a fracton region composed of two contributions associated with stretching and bond-bending modes respectively. The spectral dimensions describing these contributions are close to the measured values. The analysis of our numerical results in the light of the scaling argument is reported.
No takes yet. Share an insight, caveat, or question.
Rahmani et al. (2001) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: