A. Buzykaev et al., AEROGELS WITH HIGH OPTICAL-PARAMETERS FOR CHERENKOV COUNTERS, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 379(3), 1996, pp. 465-467
Using a two-stage sol-gel method and high temperature supercritical so
lvent removal, blocks of SiO2 with a refractive index n = 1.01-1.05 ha
ve been prepared. Measurements show that these aerogels have high valu
es of scattering and absorption lengths.