On the diffraction pattern of C $\mathsf{_{60}}$ peapods

Department of Physical Chemistry, Faculty of Chemical and Food Technology Slovak Technical University Radlinského 9 812 32 Bratislava Slovak Republic
Physics of Condensed Matter (Impact Factor: 1.28). 10/2004; 42(1):31-45. DOI: 10.1140/epjb/e2004-00355-x
Source: arXiv

ABSTRACT We present detailed calculations of the diffraction pattern of a powder of bundles of C 60 peapods. The influence of all pertinent structural parameters of the bundles on the diffraction diagram is discussed, which should lead to a better interpretation of X-ray and neutron diffraction diagrams. We illustrate our formalism for X-ray scattering experiments performed on peapod samples synthesized from 2 different technics, which present different structural parameters. We propose and test different criteria to solve the difficult problem of the filling rate determination. Copyright Springer-Verlag Berlin/Heidelberg 2004

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    ABSTRACT: We report an inelastic neutron-scattering investigation of the longitudinal acoustic modes of C60 chains confined inside single walled carbon nanotubes. We take advantage of the orientations of the chains within the plane of the pellet sample to isolate their scattering signatures in the (Q,ω) space, which we follow as a function of temperature from 260 K up to 1100 K. The results show the progressive evolution of the confined chain from a one-dimensional (1D) crystal to a linear liquid, the transition occurring within a temperature range of ∼150 K centered around 600 K. The comparison of the data obtained on monomer and polymer peapods allows extracting the speed of sound in the monomer crystalline chains (vmono=3.5 km s−1, vpoly/vmono=1.7). We find that the sound velocity is further reduced by half in the liquid state which reveals that the melting is not only due to harmonic additive thermal fluctuations, but that anharmonic terms in the intermolecular potential play an important role at high temperatures.
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    ABSTRACT: C60 fullerenes confined inside single-walled carbon nanotubes form an archetypal one-dimensional system. X-ray diffraction experiments, from room temperature to 1073 K, reveal an increasing melting phenomenon. Detailed analysis of the sawtooth peak characteristic of the fullerene organization allows the quantitative determination of fluctuations in intermolecular distances. The present results validate the predictions of one-dimensional statistical models.
    Physical Review B 02/2012; 86:045446. · 3.66 Impact Factor
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    ABSTRACT: This work is dedicated to the study of the structural and dynamical behavior of a model one-dimensional system over a wide temperature range : carbon nano-peapods. This compound is constituted of fullerenes (C60, in our case) inserted inside single-walled carbon nanotubes. The perfect match between the inner diameter of the tubes and the diameter of the fullerenes results in a chain organization of the C60 molecules. The synthesis of these peapods is described in the first part of this manuscript. The two next chapters are aimed to the description of the different experimental and simulation methods that are used to monitor the structural and dynamical behavior of the C60 molecules. In the three last chapters, we describe the behavior of the C60 molecules over three tempe- rature ranges, labeled high (500–1100 K), low (0–200 K), and intermediary (200–500 K) ranges. By comparing experimental results to analytical models for both monomer and polymer pea- pods (the rotational degree of freedom being hindered in the latter), we highlight three different behaviors of the molecules in these three ranges.
    11/2012, Degree: PhD, Supervisor: Stéphane Rols and Pascale Launois

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