Download or read book Surface Characterization of Ldef Materials written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-04 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NASA Long Duration Exposure Facility (LDEF), a passive experimental satellite, was placed into low-Earth orbit by the Shuttle Challenger in Apr. 1984. The LDEF spent an unprecedented 69 months in space. The flight and recovery of the LDEF provided a wealth of information on the longterm space environmental effects of a variety of materials exposed to the low-Earth orbit environment. Surface characterization of LDEF materials included polymers, composites, thermal control paints, and aluminum. X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), scanning electron microscopy (SEM), and contact angle analysis were used to document changes in both the surface composition and surface chemistry of these materials. Detailed XPS analysis of the polymer systems, such as Kapton, polyimide polysiloxane copolymers, and fluorinated ethylene propylene thermal blankets on the backside of the LDEF revealed significant changes in both the surface composition and surface chemistry as a result of exposure to the low-Earth orbit environment. Polymer systems such as Kapton, polyimide polysiloxane copolymers, and polysulfone showed a common trend of decreasing carbon content and increasing oxygen content with respect to the control sample. Carbon 1s curve fit XPS analysis of the composite samples, in conjunction with SEM photomicrographs, revealed significant ablation of the polymer matrix resin to expose the carbon fibers of the composite during exposure to the space environment. Surface characterization of anodized aluminum tray clamps, which were located at regular intervals over the entire LDEF frame, provided the first results to evaluate the extent of contamination with respect to position on the LDEF. The XPS results clearly showed that the amount and state of both silicon and fluorine contamination were directly dependent upon the position of the tray clamp on the LDEF. Wightman, J. P. and Grammer, Holly Little Unspecified Center NASA-CR-194519, NAS 1.26...
Download or read book Surface Characteristics of LDEF Materials written by Holly L. Grammer and published by . This book was released on 1993 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the LDEF Materials Data Analysis Workshop written by and published by . This book was released on 1990 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Surface Characterization written by Dag Brune and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Surface Characterization" provides an authoritative guide to the wide range of powerful techniques that are used to characterize the surfaces of materials. Practical in approach, it not only describes the major analytical techniques but emphasizes how they can be used to solve a multitude of chemical and physical problems. A special feature of the book is that the various techniques are grouped according to the material property under investigation. These parts are preceded by an overview comparing the capabilities of the characterization methods available. Extensive data tables allow the reader to assess rapidly the strengths as well as the pitfalls inherent in each method. Chapters on chemical composition, optical and crystallographic properties, microtopography, surface processes, tribological, electrical and magnetic properties of surface films are featured. In addition, chapters specializing on applications within the life sciences on the microscopic scale and chemometrics are included. "Surface Characterization" is addressed to both academic and industrial audiences. Scientists and engineers working on the production and development of new materials will find it an invaluable reference source. Physicist, chemists, chemical engineers, material scientists and engineers from every area of materials research will benefit from the wealth of practical advice the book provides.
Download or read book LDEF Materials Results for Spacecraft Applications written by and published by . This book was released on 1994 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Conference Publication written by and published by . This book was released on 1993 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of Solid Surfaces written by Philip F. Kane and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 675 pages. Available in PDF, EPUB and Kindle. Book excerpt: Until comparatively recently, trace analysis techniques were in general directed toward the determination of impurities in bulk materials. Methods were developed for very high relative sensitivity, and the values determined were average values. Sampling procedures were devised which eliminated the so-called sampling error. However, in the last decade or so, a number of developments have shown that, for many purposes, the distribution of defects within a material can confer important new properties on the material. Perhaps the most striking example of this is given by semiconductors; a whole new industry has emerged in barely twenty years based entirely on the controlled distribu tion of defects within what a few years before would have been regarded as a pure, homogeneous crystal. Other examples exist in biochemistry, metallurgy, polyiners and, of course, catalysis. In addition to this of the importance of distribution, there has also been a recognition growing awareness that physical defects are as important as chemical defects. (We are, of course, using the word defect to imply some dis continuity in the material, and not in any derogatory sense. ) This broadening of the field of interest led the Materials Advisory Board( I} to recommend a new definition for the discipline, "Materials Character ization," to encompass this wider concept of the determination of the structure and composition of materials. In characterizing a material, perhaps the most important special area of interest is the surface.
Download or read book LDEF 69 Months in Space Third Post Retrieval Symposium Part 2 written by and published by . This book was released on 1995 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book LDEF Materials Workshop 1991 Part 1 written by and published by . This book was released on 1992 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Preliminary Long Duration Exposure Facility LDEF Materials Data Base written by Joan G. Funk and published by . This book was released on 1992 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Materials Flown on the Long Duration Exposure Facility written by H. Gary Pippin and published by . This book was released on 1995 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Material Selection Guidelines to Limit Atomic Oxygen Effects on Spacecraft Surfaces written by D. Dooling and published by . This book was released on 1999 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Materials Flown on the Long Duration Exposure Facility Summary of Results of the Materials Special Investigation Group written by and published by . This book was released on 1995 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1994 with total page 1282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1994 with total page 1284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Characterization Techniques written by Rawesh Kumar and published by Walter de Gruyter GmbH & Co KG. This book was released on 2022-03-07 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers 10 surface characterization techniques divided into three sections. The first section covers the theoretical background, instrumentation and their salient features and a general understanding behind the results. The second section delves into deeper discussion of every terminology and concept. The third section is composed of 5 sets of examples from different research papers for every technique.
