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Fluorinated graphite intercalated with CCl4

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Fluorinated graphite intercalated with CCl4

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    1. Fluorinated graphite intercalated with CCl4 Makarova, Okotrub, Bulusheva, Yudanov, Shames

    2. General approach General approach: mild fluorination of carbon materials using a BrF3 and Br2 mixture at room temperature, which being applied to graphite gives the graphite fluoride C2F

    3. Fluorine patterns in C2F layer

    4. M. Panich, A. I. Shames, and T. Nakajima, J. Phys. Chem. Sol. 62 959 2001

    7. Underfluorinated graphite

    8. Previous sample:

    9. Previous sample

    11. The same, but without Cr

    12. High-temperature behaviour

    13. High-temperature behaviour

    14. High-temperature behaviour From M(H) curves it becomes evident that iron is present in the form of magnetite: the ZFC curves display the Vervey transition at 118K. For bulk magnetite, saturation magnetization is 92 emu/g, being lower for nanopatricles[i], e.g 68 emu/g for 12.5 nm nanoparticles[ii] or 40 60 emu/g for 3-7 nm particles[iii]. Thus, the parasitic signal corresponds to 80 250 ppm of iron, whereas the measured amount is 273 ppm. i] Laurent, S (Laurent, Sophie); Forge, D (Forge, Delphine); Port, M (Port, Marc); Roch, A (Roch, Alain); Robic, C (Robic, Caroline); Elst, LV (Elst, Luce Vander); Muller, RN (Muller, Robert N.) Title: Magnetic iron oxide nanoparticles: Synthesis, stabilization, vectorization, physicochemical characterizations, and biological applications Source: CHEMICAL REVIEWS, 108 (6): 2064-2110 JUN 2008 [ii] Panda, RN; Gajbhiye, NS; Balaji, G Title: Magnetic properties of interacting single domain Fe3O4 particles Source: JOURNAL OF ALLOYS AND COMPOUNDS, 326 (1-2): 50-53 AUG 9 2001 [iii] Lee, YJ; Lee, JW; Bae, CJ; Park, JG; Noh, HJ; Park, JH; Hyeon, T Title: Large-scale synthesis of uniform and crystalline magnetite nanoparticles using reverse micelles as nanoreactors under reflux conditions (vol 15, pg 503, 2005) Source: ADVANCED FUNCTIONAL MATERIALS, 15 (12): 2036-2036 DEC 2005 ISSN: 1616-301X

    15. Low-temperature behaviour

    16. Low-temperature behaviour

    18. Low-field behaviour

    19. ZFC-FC at different fields

    20. The same in terms of M

    21. ZFC only

    22. Estimates:

    23. Compare graphite and nickel

    24. Conclusions: we observe a field-driven transition from a superparamagnet to another magnetic state.

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