Aerogel precursor

Woignier T, Phalippou J (1988) Mechanical strength of silica aerogels. J Non-Cryst Sohds 100 404-408 Haereid S, Anderson J, Einarsrud M A, Hua D W, Smith D M (1995) Thermal and temporal aging of TMOS-based aerogel precursors in water. J Non-Cryst Solids 185 221-226... 

NMR is a great tool to investigate different properties of gels including transport kinetics. However, imaging instruments are stiU expensive. Here cooperation with medical centers equipped with such instruments could be one approach to also use the technique for aerogel precursors. 

Aerogel Precursor [mg] Solvent composition [ml] MeOH for redispersion [ml] Extra MeOH forSCD [ml]... 

Wiener, M., Reichenauer, G., Scherb, T, Fricke, J., 2004. Accelerating the synthesis of carbon aerogel precursors. /. Non-Cryst. Solids 350 126-130. 

Electrical conductivity of all polymer aerogel precursors was below the instrument detection limit (0.0001 S/m). 

Production of net-shape siUca (qv) components serves as an example of sol—gel processing methods. A siUca gel may be formed by network growth from an array of discrete coUoidal particles (method 1) or by formation of an intercoimected three-dimensional network by the simultaneous hydrolysis and polycondensation of a chemical precursor (methods 2 and 3). When the pore Hquid is removed as a gas phase from the intercoimected soHd gel network under supercritical conditions (critical-point drying, method 2), the soHd network does not coUapse and a low density aerogel is produced. Aerogels can have pore volumes as large as 98% and densities as low as 80 kg/m (12,19). 

Using alkoxides as precursors, carbon dioxide as tile drying agent, and a semicontinuous process the diying procedure became safer and faster. Introduction of organic aerogels. 

---