On an Effect of Fine Ceramic Particles on the Structure of Aerogels

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• 作者：Lorenz Ratke (1)
  Barbara Milow (1)
  Susanne Lisinski (2)
  Sandra Hoepfner (3)
  
• 关键词：Aerogels ; Particle loading ; Gel nucleation ; Specific surface area
• 刊名：Microgravity Science and Technology
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：26
• 期：2
• 页码：103-110
• 全文大小：3,042 KB
• 参考文献：1. H眉sing, N., Schubert, U.: Aerogels 鈥?Airy Materials: Chemistry, Structure, and Properties. Angew. Chem. Int. Ed., 37 (1998)
  2. Aegerter, M.A., Leventis, N., Koebel, M.: Handbook on Aerogels. Springer Verlag Heidelberg (2011)
  3. Lisinski, S., Schaniel, D., Ratke, L., Woike, Th.: Second harmonic generation by ferroelectric microparticles in composite aerogels. Chem. Mater. 18, 1534鈥?538 (2006) CrossRef
  4. Lisinski, S., Ratke, L.: Preparation of nonlinear optical aerogels and xerogels in parabolic flights. Microgravity Sci. Techn. 20, 1鈥? (2008) CrossRef
  5. Xu, Y.: Ferroelectric materials and their applications. North-Holland, Amsterdam (1991)
  6. G眉nter, P.: Nonlinear Optical Effects and Materials. Springer, Berli (1999)
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  9. Br眉ck, S., Reu脽, M., Richter, H.E., Klein, H., Haubner, P., Ratke, L.: Gelation of aerogels in parabolic flights and on the ISS. Microgravity Sci. Technol. 16, 31鈥?4 (2005) CrossRef
  10. Stamminger, A., Ettl, J., Blochberger, G., Drescher, J., Griesche, A., Hoepfner, S., H枚rschgen, M., Meyer, A., Neumann, C., Ratke, L., Plescher, E., Willnecker, R.: MAPHEUS-1: Vehicle, Subsystem Design, Flight Performance and Experiments, In: Proceedings of the 19th ESA Symposium on European Rocket and Balloon Programmes and Related Research, ESA Communication Production Office, Noordwijk, ISBN 978-92-9221-235-3, pp. 411鈥?16 (2009)
  11. Sing, K.S.W., Everett, D.H., Haul, R.A.W., Moscou, L., Pierotti, R.A., Rouqu茅rol, J., Siemieniewska, T.: Reporting Physisorption Data for Gas/Solid Systems with Special Reference to the Determination of Surface Area and Porosity. Pure & Appl. Chem. 57 (1985)
  12. Lisinski, S.: Synthese und nichtlineare optische Eigenschaften von Hybrid-Aerogelen mit ferroelektrischen Nano- und Mikropartikeln, Diploma thesis. University of Cologne, Germany (2005)
  13. Lisinski, S.: Synthese und Charakterisierung von ferroelektrischen Xerogelen, PhD thesis. RWTH Aachen, Germany (2008)
  14. Christian, J., 2nd ed.: The Theory of Phase Transformation in Metals andAlloys. Pergamon Press, Elmsford NY (1975)
  
• 作者单位：Lorenz Ratke (1)
  Barbara Milow (1)
  Susanne Lisinski (2)
  Sandra Hoepfner (3)
  
  1. Institut f眉r Werkstoff-Forschung, Deutsches Zentrum f眉r Luft- und Raumfahrt, 51147, K枚ln, Germany
  2. Johnson Controls Systems, 50679, K枚ln, Germany
  3. Institute of Applied Polymer Chemistry, FH-Aachen, 52428, J眉lich, Germany
  
• ISSN：1875-0494

文摘

The addition of ferroelectric microparticles embedded in a nanostructured silica aerogel modifies the dry gel microstructure in a measurable way. The pore size distribution changes as well as the specific surface area. This indicates a possible positive effect of particles on the gelation characteristics. These modifications were observed in solutions gelling during a sounding rocket experiment in which approximately three minutes microgravity provided sufficient time for a convection and sedimentation free gelation to occur. The paper describes the synthesis procedures and the microstructures obtained for the gels under microgravity conditions.