Abstract
Investigations of the infrared spectra of crystalline and amorphous silica particles of different sizes (0.05, 5, 10, 15, 30, 45, and 260 μm) in the range of 400-4000 cm -1 using Fourier transform infrared/photoacoustic spectroscopy are reported. The change in the intensity I of the signal with porosity ∈ of powders follows the ∈/(1-∈) dependence for strong bands and ∈ dependence for weaker bands are predicted by the theory of McGovern et al. For strong bands, I also follows the empirical relation I∼D -n , where D is the particle diameter in cm and n=0.34-0.42
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