By J. Fricke (auth.), Professor Dr. Jochen Fricke (eds.)
This booklet comprises the papers offered 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 meet.ing of this sort, wit.h members from a number of ecu count.ries, the USA of the USA, Canada, South the United States, and Africa. The assembly used to be interdisciplinary, with many of the members being physicists, chemists or fabric scientists ei ther from universities or from business study institutes. permit me attempt to shed a few gentle 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 combinations of those oxides. because of their excessive porosity (up t.o 99%!) and t.heir huge internal floor, aerogels function specially energetic 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 platforms may aid to significantly lessen thermal losses in home windows and to enhance the strength stability in passive sun structures. Aerogels even have fas cinating acoustic houses - the sound speed may 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 answer, 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
B). 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.
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Teichner: Appl. , 9, 119 (1984) 30. M. J. Teichner: Appl. , 16, 237 (1985). 31. S. M. J. Teichner: unpublished reSUlts. 32. F. Fischer and H. , 7, 97 (1926); Chem. 830 (1926) German Patent 484,337 (1925). 33. F. P. Reymond, B. J. Teichner : J. t·10lec. , 17, 171 (1982) ; Preparation of Catalysts III, G. Poncelet, P. Grange and PoJl.. , El sevier, Amsterdam 1983, p. 395. 34. B. P. J. Teichner, Catalysis on the Energy Scene, S. Kaliaguine and A. , Elsevier, Amsterdam 1984, p. 471. H. J. D. Lofftus Applied Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720, USA 1.
Aerogels: Proceedings of the First International Symposium, Würzburg, Fed. Rep. of Germany September 23–25, 1985 by J. Fricke (auth.), Professor Dr. Jochen Fricke (eds.)