A. Ney, R. Rajaram, et al.
Journal of Magnetism and Magnetic Materials
Small angle neutron scattering and Brillouin scattering experiments have been performed in porous silica aerogels with densities ranging from 0.1 to 0.4 gcm-3. The results demonstrate the fractal structure of these materials. The fractal dimension is D = 2.40 ± 0.02. The high dispersion observed was interpreted in terms of phonon to fracton crossover. From the scaling exponents, we deduced the spectral dimension d̄ = 1.25 ± 0.12. The numerical value of these exponents raises the interesting question of whichis the proper elasticity theory to be applied to these weakly connected structures. © 1987 Elsevier Science Publishers B.V.
A. Ney, R. Rajaram, et al.
Journal of Magnetism and Magnetic Materials
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Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
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Solid State Communications
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SPIE Advanced Lithography 2007