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Tuesday, August 11, 2020 | History

3 edition of Homogeneity of pristine and bromine intercalated graphite fibers found in the catalog.

Homogeneity of pristine and bromine intercalated graphite fibers

James R. Gaier

Homogeneity of pristine and bromine intercalated graphite fibers

by James R. Gaier

  • 125 Want to read
  • 9 Currently reading

Published by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Bromine.,
  • Graphite fibers.,
  • Inorganic fibers.

  • Edition Notes

    StatementJ.R. Gaier and D. Marino.
    SeriesNASA technical memorandum -- 87016.
    ContributionsMarino, D., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15284543M

    Duy Khiem Nguyen, TaeYoung Kim, Graphene quantum dots produced by exfoliation of intercalated graphite nanoparticles and their application for temperature sensors, Applied Surface Science, /, , (), (). structure typical of expanded graphite, Figure-2(A). When the intercalated graphite is exposed to intent heat within the furnace, the stack of graphite layer planes are forced apart and expanded more than hundred times of its original thickness, resulting in a low density, long and twisted worm-like segment. Magnification to a higher resolution.

      In this work, the effects of bromine (Br) doping by intercalation on the carrier concentration and sheet resistance of exfoliated highly oriented pyrolytic graphite (HOPG) were investigated by measuring the Fermi level shift using ultraviolet photoelectron spectroscopy (UPS) and the four-terminal method, respectively. The action of bromine(1)fluorosulfate on graphite has led to the synthesis of several novel intercalation compounds. The intercalation of bromine(1)fluorosulfate at room temperature results in a first stage compound, C 12 BrSO 3 F, while at higher temperatures (~ °C) C 20 BrF(SO 3 F) 2 forms instead. Oxidation of C 12 BrSO 3 F with S 2 O 6 F 2 yields C 16 Br(SO 3 F) 3 and this reaction can.

    the graphite planes direction. During intercalation pro-cess there is a charge transfer from intercalates mole-cules to graphite layers, and layers of graphite are en-riched with additional charge carriers. In this process halogens and halides act as electronic acceptors, en-riching the graphite layer with additional delocalized holes. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.


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Homogeneity of pristine and bromine intercalated graphite fibers by James R. Gaier Download PDF EPUB FB2

The resistivity of bromine intercalated graphite fibers has been shown to vary with both the diameter and the length of the fibers. This is due to bromine depletion from the fiber surface. Get this from a library. Homogeneity of pristine and bromine intercalated graphite fibers.

[James R Gaier; D Marino; United States. National Aeronautics and Space Administration.]. Homogeneity of pristine and bromine intercalated graphite fibers. By J. Gaier and D. Marino.

Abstract. Wide variations in the resistivity of intercalated graphite fibers and to use these materials for electrical applications, their bulk properties must be established. The homogeneity of the diameter, the resistivity, and the mass density of Author: J.

Gaier and D. Marino. Homogeneity of Pristine and Bromine Intercalated Graphite Fibers Gaier, J. and Marino, D., “Homogeneity of Pristine and Bromine Intercalated Graphite Fibers”, NASA TM, Prepared for the 17th Biennial Conference on Carbon, sponsored by the American Carbon Society, Lexington, KY, June Laminar composites have been fabricated from pristine and bromine intercalated Amoco P, P, and P graphite fibers and Hysol-Grafil EAG film epoxy.

The thickness and rf eddy current resistivity of several samples were measured at grid points and averaged point by point to Cited by: However, results show that bromine intercalated P graphite fibers are stable for long periods of time.

They are stable under vacuum conditions, high humidity, and current densities up to. Four-ply, alternating 0–90° laminar composites using each of the fiber types, pristine and bromine intercalated, were fabricated with RS-3 resin by YLA. In addition 1, 2, and 6 ply composites of P fabrics were fabricated, as were 0–0–0–0° composites of the T/P Between fluorinated graphene layers with a composition close to C 2 F, Br 2 molecules are intercalated in a form similar to liquid bromine.

Bromination of pristine and low-fluorinated graphitic carbons behaves very differently with distinct Br-related Raman spectra. Homogeneity of Pristine and Bromine Intercalated Graphite Fibers June Gaier, James R., YoderVandenberg, Yvonne, Berkebile, Steven, Stueben, Heather and Balagadde, Frederick, “ The Electrical and Thermal Conductivity of Woven Pristine and Intercalated Graphite Fiber-Polymer Composites ”, Carbon, Vol.

41, No. 12, pp. tivity of graphite increases from 1cm at room temperature to 1cm 1 after intercala-tion with bromine2. Bromine forms many ordered phases in graphites and undergoes an order-disorder phase transition as the amount of bromine or temperature changes2,4{8.

Bromine intercalated graphite forms stage-ncompounds where nis the number of. HOMOGENEITY OF PRISTINE AND BROMINE INTERCALATED GRAPHITE FIBERS J.R. Gaier and D. Marino National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio SUMMARY There are reports in the literature of wide variations in the resis-tivity of intercalated graphite fibers.

To use these materiais for electrical. Acid-intercalated expandable graphite (particle size: μm, the graphite had been intercalated with sulfuric acid and nitric acid) was kindly provided by Tianhe Inc.

Cl 2. Stability of bromine, iodine monochloride, copper (II) chloride, and nickel (II) chloride intercalated pitch-based graphite fibers [microform] / James R. Gaier, Melissa E. Slabe and Nanette Shaffer National Aeronautics and Space Administration ; For sale by the National Technical Information Service [Washington, DC]: [Springfield, Va Vapor‐grown carbon fibers possessing a high degree of preferential orientation have been prepared using either a catalyzed substrate or a fluidized catalytic method, yielding fibers with diameters of about 10 and 1 μm, respectively.

After heat treatment at – °C, the fibers were used as a host material for bromine intercalation to yield highly conductive filaments. Mechanical and Electrical Properties of Graphite Fiber-Epoxy Composites Made from Pristine and Bromine Intercalated Fibers Donald A.

Jaworske, Raymond D. Vannucci, and Reza Zinolabedini Journal of Composite Materials 6, fiber does not intercalate bromine [10]. The upper line in figure 1 is the rule of mixtures density for bromine intercalated hybrid fibers. As in the case of the pristine fibers, it represents a limiting value rather than a predictive one.

Once again, when the diameter exceeds about 35. Magnetoreflection study of graphite intercalated with bromine Intercalated graphite Thermal transport in CuCl2 intercalated pitch-derived carbon fibers Superconductivity in Li3Ca2C6 intercalated graphite Staging transitions in intercalated graphite.

Figure 1. Schematic illustration of the preparation process of pristine graphene ink and its printed electrodes. (a) Layered graphite was immersed in supercritical CO 2.(b)COmolecules penetrated and intercalated in the interlayer of graphite, (c) forming single- or few-layer-thick graphene sheets.

(d) Graphene sheets were stabilized. The result that the aromatic alkene 13 does not react with the brominated MWCNTs is a further hint, that the adsorbed or intercalated bromine is mostly present as reduced and monoanionic Br 2 − molecules, which do not add to the C=C bonds of alkenes like 13 in an electrophilic addition reaction.

A hybrid fiber with a PAN core surrounded by a vapor grown carbon fiber (VGCF) sheath was fabricated using a proprietary process. The density, ultimate tensile strength, Young's modulus, and resistivity of pristine and bromine intercalated fibers made by this technique having diameters varying from 5 to 50 microns were compared with the values predicted from the rule of mixtures model.

The high mechanical strengths, high moduli of elasticity, and low densities of fibers made from such substances as carbon, boron, and glass, when combined with the toughness of various epoxy, polyester, and polyimide resins, produce a class of materials possessing specific tensile properties that can match or exceed (depending on the fiber.A series of woven fabric laminar composite plates and narrow strips were fabricated from a variety of pitch-based pristine and bromine intercalated graphite fibers in an attempt to determine the influence of the weave on the electrical and thermal conduction.

Carbon fibers are widely used in daily life because of their light weight, high mechanical strength and environmental stability.

As one of the carbon-based fibers.