By J. Fricke (auth.), Professor Dr. Jochen Fricke (eds.)

This e-book comprises the papers awarded on the "First overseas Sympo­ st sium on Aerogels (1 ISA)", held in September 1985 at. the college of Wiirzburg, Fed. Rep. of Germany. It used to be the 1st of this sort, wit.h contributors from a number of eu count.ries, the USA of the USA, Canada, South the US, and Africa. The assembly used to be interdisciplinary, with lots of the contributors being physicists, chemists or fabric scientists ei­ ther from universities or from commercial study institutes. permit me attempt to shed a few mild upon the category of drugs the symposium used to be approximately: Aerogels are super porous high-tech fabrics, consisting ei­ ther of silica, alumina, zirconia, stannic or tungsten oxide or combos of those oxides. because of their excessive porosity (up t.o 99%!) and t.heir huge internal floor, aerogels function specially lively catalysts or as catalytic subst.rates, as adsorbents, fillers, reinforcement brokers, pigments and gellifying brokers. Silica aerogels as translucent or obvious superinsulating fillers in window structures may support to significantly lessen thermal losses in home windows and to enhance the power stability in passive sunlight platforms. Aerogels even have fas­ cinating acoustic homes - the sound speed will be as little as a hundred m/s! The creation of aerogels begins with the managed conversion of a sol right into a gel: the expansion of clusters or polymer chains from a chemical resolution, the cross-linking of those basic entities and the formation of a coherent community - nonetheless embedded in a liquid.

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Extra resources for Aerogels: Proceedings of the First International Symposium, Würzburg, Fed. Rep. of Germany September 23–25, 1985

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Aerogels treated in this way may be transformed into glasses of optical quality which can be safely rehe'ated and worked at high temperatures. The gel-glass transformation occurs in two stages which, in the case of monolithic aerogels, may be conveniently followed by dilatometry [5J D2J. 5, indicative of a diffusional mechanism. which is characteristic of sintering by viscous flow. In the intermediate range both mechanisms are operative. 5. Devitrification behaviour 5intering is in competition with crystallization (devitrification) phenomena.

Experimental studies confirmed the similarity of aerogels produced by the low and high-temperature drying process. These developments significantly enhance the attractiveness of the commercial manufacture of transparent silica aerogels for window glazing material. 2. Introduction Silica aerogels were first produced by KISTLER [1-2] over fifty years ago and were characterized as an open, cross-linked silica structure with a high fraction of voids with extremely fine pore sizes. Because the particle and pore sizes are extremely small, aerogels scatter light only weakly, and therefore are quite transparent.

B. A. J. Teichner :-Sull. Soc. Chim. France, 12@, 3988. A. J. Teichner : Bull. Soc. Chim. France, 1968, 4343. B. A. J. Teichner Bull. Soc. Chim. France, 1969, 1466. A. A. J. Teichner : Bull. Soc. Chim. France, 1970, 3384. A. J. Teichner : J. Chim. , 65, 870 (1968). M. Cantin, 11. Casse, L. Koch, R. Jouan, P. Mestreau,- D. Roussel, F. Bonnin, J. J. Teichner : Nucl. Instrum. Methods, 118, 177 (1974). J. Chim. , 71, 1537 (1974). t,1. Pajonk, M. J. M. Haynes and P. W. Arrowsmit~ Bristol 1985, p. 227.

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