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Capture of Hypervelocity Particles with Low-Density Aerogel

2018-07-06
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Book Synopsis Capture of Hypervelocity Particles with Low-Density Aerogel by : National Aeronautics and Space Administration (NASA)

Download or read book Capture of Hypervelocity Particles with Low-Density Aerogel written by National Aeronautics and Space Administration (NASA). This book was released on 2018-07-06. Available in PDF, EPUB and Kindle. Book excerpt: Recent impact experiments conducted at Johnson Space Center supported a space-exposed flight instrument called the orbital debris collector (ODC) to see whether SiO2 acrogel performed adequately as a collector to capture cosmic dust particles and/or manmade debris, or whether additional development is needed. The first ODC was flown aboard the Mir for 18 months, while the second will be flown aboard a spacecraft (Stardust, to be launched in 1999) that will encounter the comet Wild 2 and return to Earth. Aerogels are highly porous materials that decelerate high-velocity particles without substantial melting or modifications to the particles' components; in other denser materials, these particles would melt or vaporize upon impact. The experimental data in this report must be considered somewhat qualitative because they are characterized by substantial, if not intolerable, scatter, possibly due to experimental difficulties in duplicating given sets of initial impact conditions. Therefore, this report is a chronological guide of the experimenters' attempts, difficulties, progress, and evaluations for future tests. Hoerz, Friedrich and Cintala, Mark J. and Zolensky, Michael E. and Bernhard, Ronald B. and Haynes, Gerald and See, Thomas H. and Tsou, Peter and Brownlee, Donald E. Jet Propulsion Laboratory; Johnson Space Center...

CAPTURE OF HYPERVELOCITY PARTICLES WITH LOW-DENSITY AEROGEL... NASA/TM-98-201792... JUL. 6, 1998

1999*
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Release : 1999*
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Book Synopsis CAPTURE OF HYPERVELOCITY PARTICLES WITH LOW-DENSITY AEROGEL... NASA/TM-98-201792... JUL. 6, 1998 by : United States. National Aeronautics and Space Administration

Download or read book CAPTURE OF HYPERVELOCITY PARTICLES WITH LOW-DENSITY AEROGEL... NASA/TM-98-201792... JUL. 6, 1998 written by United States. National Aeronautics and Space Administration. This book was released on 1999*. Available in PDF, EPUB and Kindle. Book excerpt:

Capture of Hypervelocity Particles with Low-Density Aerogel

1998
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Release : 1998
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Book Synopsis Capture of Hypervelocity Particles with Low-Density Aerogel by : Friedrich Hörz

Download or read book Capture of Hypervelocity Particles with Low-Density Aerogel written by Friedrich Hörz. This book was released on 1998. Available in PDF, EPUB and Kindle. Book excerpt:

Physics of Interplanetary Dust Collection with Aerogel

2018-07-09
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Release : 2018-07-09
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Book Rating : 181/5 ( reviews)

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Book Synopsis Physics of Interplanetary Dust Collection with Aerogel by : National Aeronautics and Space Administration (NASA)

Download or read book Physics of Interplanetary Dust Collection with Aerogel written by National Aeronautics and Space Administration (NASA). This book was released on 2018-07-09. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of research undertaken to study various problems associated with hypervelocity capture of dust particles in aerogel. The primary topics investigated were the properties of shocked aerogel and the requirements for reliable capture of particles on the STARDUST mission. In particular, the viscosity of shocked aerogel has been an open question. The results presented here suggest that the viscosity of aerogel at high impact velocities is negligible, although there remains some uncertainty about lower velocities. The model adopted for viscosity treats the mixture of polymeric silica and decomposition products and finds that, for particle velocities of 6-7 km/s, the viscosity is similar to that typical of light gasses at STP. Expressions for the Hugoniot of aerogel as a function of density were also obtained from the available data. All aerogels of interest for cosmic dust collectors have very similar shock velocity-particle velocity Hugoniot curves. The strength behavior of aerogel for low-speed penetration was measured, but further work is needed to study the proper way to apply this to the issue of terminal deceleration of a dust particle. Preliminary calculations designed to maximize the penetration depths were performed to determine the required density of aerogel to reliably stop a particle in a 3 cm thickness of aerogel (the path length expected for a normal impact into the STARDUST collector). In order to stop a particle of density rho(sub p) and diameter d(sub p), the mean density of the aerogel collector should be no less than that given by the expression bar rho(sub 0) = 1.085 X 10(exp -4 )rho(sub p)d(sub p), for densities measured in g/ cu cm and the particle diameter measured in micrometers. Anderson, William W. Johnson Space Center NAG9-913...

Aerogels Handbook

2011-06-10 Technology & Engineering
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Release : 2011-06-10
Genre : Technology & Engineering
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Book Rating : 896/5 ( reviews)

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Book Synopsis Aerogels Handbook by : Michel Andre Aegerter

Download or read book Aerogels Handbook written by Michel Andre Aegerter. This book was released on 2011-06-10. Available in PDF, EPUB and Kindle. Book excerpt: Aerogels are the lightest solids known. Up to 1000 times lighter than glass and with a density as low as only four times that of air, they show very high thermal, electrical and acoustic insulation values and hold many entries in Guinness World Records. Originally based on silica, R&D efforts have extended this class of materials to non-silicate inorganic oxides, natural and synthetic organic polymers, carbon, metal and ceramic materials, etc. Composite systems involving polymer-crosslinked aerogels and interpenetrating hybrid networks have been developed and exhibit remarkable mechanical strength and flexibility. Even more exotic aerogels based on clays, chalcogenides, phosphides, quantum dots, and biopolymers such as chitosan are opening new applications for the construction, transportation, energy, defense and healthcare industries. Applications in electronics, chemistry, mechanics, engineering, energy production and storage, sensors, medicine, nanotechnology, military and aerospace, oil and gas recovery, thermal insulation and household uses are being developed with an estimated annual market growth rate of around 70% until 2015. The Aerogels Handbook summarizes state-of-the-art developments and processing of inorganic, organic, and composite aerogels, including the most important methods of synthesis, characterization as well as their typical applications and their possible market impact. Readers will find an exhaustive overview of all aerogel materials known today, their fabrication, upscaling aspects, physical and chemical properties, and most recent advances towards applications and commercial products, some of which are commercially available today. Key Features: •Edited and written by recognized worldwide leaders in the field •Appeals to a broad audience of materials scientists, chemists, and engineers in academic research and industrial R&D •Covers inorganic, organic, and composite aerogels •Describes military, aerospace, building industry, household, environmental, energy, and biomedical applications among others

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