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Title: Small-angle neutron scattering data on C{sub 60} clusters in weakly polar solutions of fullerenes

Abstract

Solutions of fullerence C{sub 60} in carbon disulfide CS{sub 2} have been investigated by small-angle neutron scattering. Combination of solubility, contrast, and incoherent scattering make it possible to measure and analyze the relatively small scattering cross section of this system. Along with single fullerene molecules, a small amount of large fullerene clusters (more than 100 A in size) is found in these solutions. The formation of these clusters depends on the procedure of solution preparation. The size distribution functions of clusters are compared with the results of the phenomenological cluster model of fullerene solubility.

Authors:
; ;  [1]
  1. Joint Institute for Nuclear Research (Russian Federation)
Publication Date:
OSTI Identifier:
21090909
Resource Type:
Journal Article
Resource Relation:
Journal Name: Crystallography Reports; Journal Volume: 52; Journal Issue: 3; Other Information: DOI: 10.1134/S1063774507030261; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CARBON SULFIDES; CLUSTER MODEL; CROSS SECTIONS; DISTRIBUTION FUNCTIONS; FULLERENES; INCOHERENT SCATTERING; NEUTRON DIFFRACTION; SMALL ANGLE SCATTERING; SOLUBILITY; SOLUTIONS

Citation Formats

Tropin, T. V., E-mail: ttv@nf.jinr.ru, Avdeev, M. V., and Aksenov, V. L. Small-angle neutron scattering data on C{sub 60} clusters in weakly polar solutions of fullerenes. United States: N. p., 2007. Web. doi:10.1134/S1063774507030261.
Tropin, T. V., E-mail: ttv@nf.jinr.ru, Avdeev, M. V., & Aksenov, V. L. Small-angle neutron scattering data on C{sub 60} clusters in weakly polar solutions of fullerenes. United States. doi:10.1134/S1063774507030261.
Tropin, T. V., E-mail: ttv@nf.jinr.ru, Avdeev, M. V., and Aksenov, V. L. Tue . "Small-angle neutron scattering data on C{sub 60} clusters in weakly polar solutions of fullerenes". United States. doi:10.1134/S1063774507030261.
@article{osti_21090909,
title = {Small-angle neutron scattering data on C{sub 60} clusters in weakly polar solutions of fullerenes},
author = {Tropin, T. V., E-mail: ttv@nf.jinr.ru and Avdeev, M. V. and Aksenov, V. L.},
abstractNote = {Solutions of fullerence C{sub 60} in carbon disulfide CS{sub 2} have been investigated by small-angle neutron scattering. Combination of solubility, contrast, and incoherent scattering make it possible to measure and analyze the relatively small scattering cross section of this system. Along with single fullerene molecules, a small amount of large fullerene clusters (more than 100 A in size) is found in these solutions. The formation of these clusters depends on the procedure of solution preparation. The size distribution functions of clusters are compared with the results of the phenomenological cluster model of fullerene solubility.},
doi = {10.1134/S1063774507030261},
journal = {Crystallography Reports},
number = 3,
volume = 52,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • Fullerene clusters in the C{sub 60}/N-methyl-2-pyrrolidone (NMP)/water system have been investigated by small-angle neutron scattering. It is shown that the scattering cross section corresponding to the size range 10-100 nm depends on the water content in the mixture. Addition of water to a C{sub 60}/NMP solution in an amount exceeding 40% leads to a sharp increase in the average scattering cross section. This effect depends on the interval between the times of preparation of a C{sub 60}/NMP solution and its dilution with water: the size of the clusters formed as a result of adding water increases with increasing the agemore » of the initial solution. The reasons for this effect are discussed.« less
  • Small-angle neutron scattering (SANS) is a proven tool for examining the structure and interactions of particles in solution, though the dimensions of carbon-cage molecules are close to the lower resolution limit of the technique. Deuterated solvents (toluene-[ital d][sub 8] and benzene-[ital d][sub 6]) have virtually no scattering contrast with carbon, and the high incoherent cross section of protonated (hydrogen containing) solvents severely limits the path length of solutions by reducing the sample transmission. We have circumvented these difficulties by using CS[sub 2] as a solvent which has good contrast with carbon, and a low incoherent cross section which allows themore » use of long sample path lengths (up to [similar to]10 cm). In addition, CS[sub 2] has good solubility for fullerenes and these properties permit the measurement of the radii of gyration ([ital R][sub [ital g]]) of both C[sub 60] ([ital R][sub [ital g]]=3.82[plus minus]0.05 A) and C[sub 70] ([ital R][sub [ital g]]=4.13[plus minus]0.05 A). These dimensions are similar to those calculated from the atomic coordinates after allowing for a solvent exclusion volume. Close agreement between the measured absolute scattering cross sections and the values calculated from the particle and solvent scattering length densities serves as a cross check on the validity of this methodology. To our knowledge, this represents the first successful application of SANS for the characterization of fullerenes. SANS makes it possible to study the size and shapes of modified buckyballs, solute/solvent interactions, crystal growth from saturated solutions, and temperature dependent transitions in solutions.« less
  • Raman-scattering measurements have been performed [ital in] [ital situ] in ultrahigh vacuum on [ital A][sub 4]C[sub 60] ([ital A]=Rb,K) body-centered-tetragonal films prepared by sublimation of alkali metals from [ital A][sub 6]C[sub 60]. The polarized and depolarized spectra indicate substantial broadening of tangential [ital H][sub [ital g]] modes as well as large disorder-induced radial-mode scattering. Alkali-metal local-site disorder due to either compositional fluctuations or site displacements are suggested. This disorder, in addition to electron-correlation effects, is expected to influence the nonmetallic nature of these materials. Variations in [ital H][sub [ital g]] mode frequencies and widths for all [ital x] values emphasizemore » radial-mode electron-phonon damping for [ital x]=3.« less
  • Nanometer-scale particles (Mn–C clusters) were analyzed quantitatively using small-angle neutron scattering in 18Mn–0.6C (wt.%) austenite high-manganese steel. The size, number, and volume fraction of the particles were determined as a function of strain (0, 5, 15, 30, 45, 50%) at different temperatures (25 and 100 °C). The diameter of the cluster ranges from 2 to 14 nm in the matrix. The total volume fraction of the cluster significantly increases from 2.7 × 10{sup −6} to 8.7 × 10{sup −6} as the strain increases. Such clustering phenomenon is correlated to the serration behavior under loading in high-manganese steels. - Highlights: •more » Show Mn-C clustering as function of strain in 18Mn-0.6C TWIP steel. • Determine the size, number, and volume fraction of clusters quantitatively. • Compare the clustering behavior at 25 and 100 °C.« less
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