2 edition of Effect of intercalation in graphite epoxy composites on the shielding of high energy radiation found in the catalog.
Effect of intercalation in graphite epoxy composites on the shielding of high energy radiation
1997 by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .
Written in English
|Statement||James R. Gaier ... [et al.].|
|Series||NASA technical memorandum -- 107413|
|Contributions||Gaier, James R., United States. National Aeronautics and Space Administration.|
|The Physical Object|
Radiation shielding is a mass of absorbing material placed between yourself and the source of radiation in order to reduce the radiation to a level that is safer for humans.. The effectiveness of the material depends on: – the type of radiation itself – properties of the shielding material – the shielding strength or thickness of that material. For this reason, 3D printing has possible applications in rapid creation of space-based devices, for example cube satellites (CubeSat). This work focused on fabrication and characterization of tungsten-doped polycarbonate polymer matrix composites specifically designed for x-ray radiation-shielding by: McCaffrey, Tessier, and Shen: Radiation shielding materials and radiation scatter for IR for non-Pb radiation protection garments to avoid hazardous material disposal issues has resulted in the production of ma-terials that incorporate one or more less toxic metal powders into polymer layers– A combination of high-pressure compression molding plus salt-leaching was first proposed to prepare porous graphene /polystyrene composites. The specific shielding effectiveness of the lightweight composite was as high as dB cm 3 g −1, the highest value ever reported for polymer based EMI shielding materials at such a low thickness ( mm).Cited by:
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Effect of Intercalation in Graphite Epoxy Composites on the Shielding of High Energy Radiation July Synthesis and Thermal Stability of Graphite Oxide-like Materials July The Electrical Resistivity of Woven Graphite Fiber Fabric Polyisocyanate Resin Composites Get this from a library.
Effect of intercalation in graphite epoxy composites on the shielding of high energy radiation. [James R Gaier; United States. National Aeronautics and Space Administration.;].
EMI Shields Made From Intercalated Graphite Composites. /_, James R. Gaier Lewis Research Center Cleveland, Ohio and unstable in air at the temperature needed to cure epoxy resins, the residual intercalation time varying source of high energy particles and File Size: KB.
Effect Atomic of Intercalation in Graphite Epoxy Composites on the Shielding of High Energy Radiation The half-thickness and mass absorption coefficient of keV x-rays, keV γ-rays, and MeV βө particles have been measured for pristine, bromine intercalated, and iodine monobromide Effect of intercalation in graphite epoxy composites on the shielding of high energy radiation book pitch-based graphite fiber composites.
These EMI shielding results, combined with the advantages of a cheap and abundant supply of graphite and the solution processability of the functionalized graphene sheets at high purity, indicate that graphene/polymer composites can be used commercially as effective and lightweight shielding materials for electromagnetic by: T/ graphite-epoxy composite was subjected to MeV electron radiation for a total dose of x 10(10) rads at a rate of x 10(7) rads/hour.
This simulates a worst case exposure. Intercalation becomes an enabling technology for graphite fiber/epoxy composites within the GHz and up frequency region. The geometry of spacecraft is such that near-field shielding is required forAuthor: James Gaier.
Structural Composite Radiation Shielding Materials Composite carbon fiber structures are alluring with the high strength-to-weight ratios they offer, despite difficult property demands they must meet in the space environment. Mechanical, chemical, electrical, and thermal requirements in space-based systems areFile Size: 58KB.
Introduction. With the development of nuclear power industry, radiation medicine and aerospace exploration, safety of operators and equipment working in these ionizing radiation environments becomes an essential issue to be these radiations, high energy photon radiation, such as X-ray and gamma ray, has strong penetrability and hazardous Cited by: •Nuclear graphite •Radiation effects Research into the subject of radiation damage in graphite began in the early s as a part of the development of nuclear weapons and nuclear power.
Effect of intercalation in graphite epoxy composites on the shielding of high energy radiation book that time many graphite moderated nuclear fission reactors have been built and many varieties of graphite Size: 1MB.
The efficiency of shielding these materials significantly varies depending on the type of radiation and energy range. 14 Lead and other metals that have large atomic mass are used to attenuate high energy radiation, such as X-rays and gamma rays.
Metals are not always capable of blocking all types of radiation, notably neutron emissions in Cited by: 3. Graphene is also Effect of intercalation in graphite epoxy composites on the shielding of high energy radiation book good at blocking nuclear radiations.
A russian team has showed that it was more efficient than the bentonite clay (usually used for that purpose). The material has been produced in Rice University (USA) and studied in Moscow. A comprehensive analysis of electrical, electromagnetic (EM), mechanical, and thermal properties of epoxy resin composites filled with – wt.
% of carbon additives characterized by high surface area, both nano-sized, like carbon nanotubes (CNTs) and carbon black (CBH), and micro-sized exfoliated graphite (EG), was performed. We found that the Cited by: The new type of Pb-B shielding alloys with high tensile strength and hardness were prepared by casting.
The microstructure and morphology of the Pb-B alloys were investigated by scanning electron microscope (SEM) analysis. Mechanical properties and radiation shielding effect of the alloys were compared with other Pb-based shielding alloys. The results indicate that the Cited by: 1.
HZE high charge and energy. hydrogen, polyethylene, water, and epoxy shielding to aluminum for one-layer configurations with depths of 5 to 40 g/cm2, or two-layer configurations with an outer 10 g/cm2 aluminum layer, radiation shielding or biological countermeasures.
Passive radiation shielding is a mandatory element in the design of an integrated solution to mitigate the effects of radiation during long deep space voyages for human exploration.
Understanding Cited by: 7. The resulting composites were evaluated for electromagnetic interference (EMI) shielding at different filler loadings.
The prepared PU/GNPs composites were found to be highly effective with shielding effectiveness of dB, and with electromagnetic interference shielding materials at –1 by: 8. high atomic number (Z > 10) and high energy (E > GeV) (Ref.
These high energy, high charge (HZE) particles comprise only 1% to 2% of the total GCR fluence, but they interact with very high specific ionizations and thus contribute about 50% of the long-term space radiation dose in humans (Ref.
2).File Size: KB. Linear low density polyethylene based and metal oxide (PbO and WO3) filled composites were prepared and characterized for ionizing electromagnetic radiation (IEMR) shielding applications. Density properties, microscopic structure and shielding performances of the composites with different filler loadings were investigated at three different IEMR energy Cited by: Several kinds of functional particles modified epoxy multilayer composite, which were constituted with lead acrylate/erbium oxide/epoxy and tungsten oxide/erbium oxide/epoxy layer by layer, were successfully prepared.
The shielding properties under different γ-ray were tested and discussed in detail. Multilayer composite exhibited higher shielding ability to lower energy by: 1. Graphite intercalation compounds (GICs) are complex materials having a formula CX m where the ion X n+ or X n− is inserted (intercalated) between the oppositely charged carbon lly m is much less than 1.
These materials are deeply colored solids that exhibit a range of electrical and redox properties of potential applications. Effect of Heat of Intercalation on Graphite Temperature, Ching-cheh Hung National Aeronauilcs and Spacé Administration Lewi s Research Center Cleveland,Ohio Introducil on Ouring intercalatlon, the temperature of graphite will become higher than the surrounding temperature if the intercalation reaction ls strongly exothermic.
() Graphite planes 0min C 5 n m5 n m °C () Graphite planes 10min C 5 n m5 n m 5 n m5 n m 20min C °C () Graphite planes Images courtesy of University of York in-situ TEM facilities kV electron beam exposure Literature* quotes the migration energy of File Size: 2MB.
the graphite/PS composites Fig. 2 TGA curves of the graphite/PS composites from RT to C at a rate of 20 C/min, under air ﬂow. In the inset of Fig. 1, one can see the theoretical and experimental % w/w concentration of graphite in the polymeric ﬁlms Electromagnetic shielding effectiveness and mechanical properties of graphite-based.
The aerogel based hybrid composites of MXene and graphene are critically reviewed and correlate with structure, role of size, thickness, effect of processing technique, and interfacial interaction in shielding efficiency.
Further, freeze drying, pyrolysis and hydrothermal treatment is a powerful tool to create excellent EMI shielding aerogels.
The variation of shielding effectiveness (SE) for PVC/graphite composites with graphite content of 0 to 20 wt. %, over the frequency range of 8–12 GHz, is shown in Fig. The variations in SE are more or less similar to the changes in conductivity with graphite loading (Fig.
It is interesting to note that SE increases sharply up to. The utilization of nuclear energy makes great demands on the knowledge of the engineers engaged in design work and calculations relating to construction in nuclear industry.
Apart, of course, from nuclear reactors themselves, a great deal of. For example, the silane-treated graphite composites showed a higher thermal conductivity than the non-silane-treated graphite composites. In some cases, the treatment of the graphite with UV/O 3 did not have an influence on thermal conductivity of the resulting composite materials.
Lately, the incorporation of the second filler with graphite Cited by: 2. Materials for Low-Energy Radiation Shielding Robert C. Singleterry, Jr., and Sheila A. Thibeault Langley Research Center, Hampton, Virginia Neutron National Aeronautics and Space Administration Langley Research Center Hampton, Virginia June Active Radiation Shielding Utilizing High Temperature Superconductors Shayne Westover, PI – NASA JSC R.
Battiston – INFN, University of Perugia, Italy. R.B. Meinke - Advanced Magnet Lab, Inc. Van Sciver – Florida State University. Robert Singleterry – NASA LaRC. NIAC Symposium, MarchHubble: Carina Nebula. The production of high electrically conductive polymer composites has attracted attention due to their applications in many fields, including electrostatic and electromagnetic interference shielding (EMI), conductive thin films, a flexible electrode in light emitting diodes, and many others [1,2,3,4,5,6].Electromagnetic interference shielding effectiveness (EMI SE) strongly depends Cited by: Electrical, Dielectric, and Electromagnetic Shielding Properties of Polypropylene-Graphite Composites Varij Panwar,1 Jong-Oh Park,1 Suk-Ho Park,1 Sanjeev Kumar,2 R.
Mehra2 1School of Mechanical and Systems Engineering, Chonnam National University, GwangjuRepublic of Korea 2Department of Electronic Science, University of Delhi South Campus.
Radiation Shielding By Dr. Ronald Turner Fellow. Analytic Services Inc. Suite Elementary Concepts of Shielding. Energy Deposition Elementary Concepts of Radiobiology. Doses, Fluence, and Dose Rates particularly if the shielding material is high z (metals, for example), before shielding becomes effective in File Size: 1MB.
Engineering Compendium on Radiation Shielding book. Read reviews from world’s largest community for readers. The utilization of nuclear energy makes grea 5/5.
A new line of nontoxic, high density, polymer-metal composites, trademarked as Ecomass® Compounds , can replace lead and many other traditional metallic materials in a variety of application areas including weighting, balancing, vibration dampening, and radiation Size: KB.
Read "Analysis of electrical, dielectric, and electromagnetic interference shielding behavior of graphite filled high density polyethylene composites, Polymer Engineering & Science" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Study of Shielding properties for NBR rubber /nano silica composites against gamma radiation DOI: /X 38 | Page In this work, the effect of surface modified nanosilica on the mechanical and gamma shielding. shielding efficiency of high density polyethylene/trioxide of vanadium (HDPE/V 2 O 3) and low density polyethylene/trioxide of vanadium (LDPE/V 2 O 3) conductive polymers composites in near and far field.
This study was realized over a wide range of frequency (50MHzGHz). To this effect, the volume fraction of the. Electromagnetic Shielding and Electrical Properties of Polyurethane Acrylate/E-Glass Composites in the GHz Frequency Range A. Gungor1, I. Usta2, M. Ugur1, Z. Yildiz2, and E. Sancak2, C. Macit1 1Marmara University, Faculty of Arts and Sciences, Department of Chemistry, Istanbul, Turkey [email protected] 2Marmara University, Technical Education Faculty.
Oriental Journal of Chemistry is a peer reviewed quarterly research journal of pure and applied chemistry. It publishes standard research papers in almost all thrust areas of current chemistry of academic and commercial importance. It provides a platform for rapid publication of quality research papers, reviews and chemistry letters.
Oriental Journal of Chemistry is abstracted. Thermal/Radiation shielding and Load Bearing Structural Applications pdf Aerospace/Defence Wasiq Bokhari Quantum Insight Sponsored by: Coordinated by: Deepak Srivastava Abstract The paper provides a proposal for a pilot project aimed at the creation and use of Polymer Clay Nano-composites (PCN’s) in the Aerospace/Defence and other industries.Graphite–graphene hybrid ﬁller system for high thermal conductivity of epoxy composites Nayandeep K.
Mahanta Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OhioUSA Marcio R. Loosb) Federal University of Santa Catarina, Blumenau Brazil Ica Manas Zlocozower. The composites of nanoparticles of magnetic ebook Co, Ni, and Ni–Fe ebook on the nanolayers of expanded graphite (EG) were prepared by the impregnation of EG with ethanol solutions of metal acetates, followed by drying and reduction in H2.
Such composites combined the properties of high electric conductivity of EG and magnetic conductivities of Cited by: