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moduli of both natural and silanated mesoporous samples at room temperature. Orthogonal parallelepipeds of about 2.9 x 3.0 x 3.1 mm 3 were used to gather resonance spectra from 50 to 1100 kHz. For each sample 25 peaks resulting from excited resonant eigenmodes and corresponding overtones then were fitted via a Lagrangian minimization routine gaining bulk modulus K and shear modulus G (see Tab. I) with an accuracy of less than 1%. For further experimental details see e. g. Ref. 39. Young´s modulus Y was calculated from Y = 9 KG/ (3 K + G ) and used to calibrate DMA raw data at room temperature (see Figs. 1, 2 and 3). 

