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The light intensity scattered by silica gels shows a wavevector-dependence characteristic of mass fractal objects. The correlation length ξ beyond which the material is homogeneous and the fractal dimension D can be determined. For base catalysed alcogels a value D ≈ 1.66 nearly independent of aging and concentration is obtained. ξ rises up to 200 nm for the lightest sample. The comparison of these values with those obtained by small angle neutron scattering (SANS) on the same series of samples after hypercritical drying, i.e. aerogels, confirms that the drying has but little influence on the gel texture

LIGHT SCATTERING INVESTIGATION OF THE FRACTAL BEHAVIOUR OF SILICA GELS