Gradient density aerogel

Jones S M (2007) A method for producing gradient density aerogel. J Sol-Gel Sci Techn 44 255-258... 

Gradient density silica aerogel was developed and produced for the Stardust particle capture grids, since it was considered to have superior captiue properties. When high-velocity particles begin to penetrate the gradient density aerogel, they first encounter... 

Jones S M (2007) A method for producing gradient density aerogel. J Sol-Gel Sci Technol 44 255—258 Sandford S A, et al (2006) Organics captured from comet 81PAVild 2 by the Stardust spacecraft. Science 314 1720-1724... 

Figure 32.2. The cometary facing forward) and interstellar aerogel grids were assembled back to back for separate cometary and interstellar particle capture periods. The aerogel cells shown are gradient density typically 10-50 mg/cc, as explained in the text.

Figure 32.4. Entry track produced by the capture of 50 pm hypervelocity fine particle in silica aerogel. The aerogel shown was gradient density 15-50 mg/cc.

Gradient density aerr el Aerogel with a continuously changing density profile... 

The strongly density-dependent factor G considers the effects of the ineffective dead ends of the solid backbone, the increase in the specific heat due to the enhanced specific surface of an aerogel, the meandering chains along a temperatme gradient and the constriction of heat flow at the connecting area between the primary particles within the chains. A proper approach to the description of the density dependence is provided by the... 

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