TEXTURAL AND STRUCTURAL STUDIES OF AEROGELS BY RAMAN SCATTERING AND THERMOPOROMETRY J.L. ROUSSET, A. BOUKENTER, B. CHAMPAGNON, E. DUVAL, J.F. QUINSON, M. CHATELUT, J. DUMAS and J. SERUGHETTI J. Phys. Colloques, 50 C4 (1989) C4-163-C4-166 DOI: 10.1051/jphyscol:1989426