By a News Reporter-Staff News Editor at Defense & Aerospace Week -- Investigators publish new report on Aeronautics and Astronautics. According to news reporting from Memphis, Tennessee, by VerticalNews journalists, research stated, "Silica-based aerogel is an ideal thermal insulator with a makeup of up to 99% air associated with the highly porous nature of this material. Polyurea cross-linked silica aerogel (PCSA) has superior mechanical properties compared to the native aerogels yet retains the highly porous open pore network and functions as an ideal thermal insulator with added load-bearing capability necessary for some applications."
The news correspondents obtained a quote from the research from the University of Memphis, "Room temperature vulcanizing rubber-RTV 655 is a space qualified elastomeric thermal insulator and encapsulant with high radiation and temperature tolerance as well as chemical resistance. Storage and transport of cryogenic propellant liquids is an integral part of the success of future space exploratory missions and is an area under constant development. Limitations and shortcomings of current cryogenic tank materials and insulation techniques such as non-uniform insulation layers, self-pressurization, weight and durability issues of the materials used, has motivated the quest for alternative materials. Both RTV 655 and PCSA are promising space qualified materials with unique and tunable microscopic and macroscopic properties making them attractive candidates for this study. In this work, the effect of PCSA geometry and volume concentration on the thermal behavior of RTV 655 PCSA compound material has been investigated at room temperature and at a cryogenic temperature. Macroscopic and microscopic PCSA material was encapsulated at increasing concentrations in an RTV 655 elastomeric matrix. The effect of pulverization on the nanopores of PCSA as a method for creating large quantities of homogeneous PCSA microparticles has also been investigated and is reported. The PCSA volume concentrations ranged between 22% and 75% for both geometries."
According to the news reporters, the research concluded: "Thermal conductivity measurements were performed based on the steady state transient plane source method."
For more information on this research see: Thermal conductivity studies of a polyurea cross-linked silica aerogel-RTV 655 compound for cryogenic propellant tank applications in space. Acta Astronautica, 2013;91():173-179. Acta Astronautica can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier - www.elsevier.com; Acta Astronautica - www.elsevier.com/wps/product/cws_home/310)
Our news journalists report that additional information may be obtained by contacting F. Sabri, University of Memphis, Dept. of Mech Engn, Memphis, TN 38152, United States. Additional authors for this research include J. Marchetta and K.M. Smith.
Keywords for this news article include: Memphis, Tennessee, United States, North and Central America, Aeronautics and Astronautics
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