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Sökning: WFRF:(Duif C)

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1.
  • Schmets, A.J.M., et al. (författare)
  • First-principles investigation of the multiple phases in bituminous materials : the case of asphaltene stacking
  • 2009
  • Ingår i: ADVANCED TESTING AND CHARACTERISATION OF BITUMINOUS MATERIALS. - Rhodes, Greece. ; , s. 143-150
  • Konferensbidrag (refereegranskat)abstract
    • The existence of a microstructure in bituminous materials can explain this materials tendency to self heal. By means of atomic force microscopy and small angle neutron scattering the existence of the microstructure is demonstrated once again. Then it is suggested that the observed microstructure may very well be a consequence of the aggregation of asphaltenic molecules (providing internal volumes with a low H/C-ratio). This is a rather unadventurous suggestion, because flocculation of asphaltenes costs the global oil industry millions of dollars per day. A model asphaltene (a coronene-like molecule) has been selected for calculating semi-empirically the tendency to form stacks. It was found that there is some tendency to cluster, but the effect is not strong enough to be responsible for the observed microstructure.
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2.
  • Strobl, Markus, et al. (författare)
  • Using a grating analyser for SEMSANS investigations in the very small angle range
  • 2012
  • Ingår i: Physica B: Condensed Matter. - : Elsevier BV. - 0921-4526. ; 407:21, s. 4132-4135
  • Tidskriftsartikel (refereegranskat)abstract
    • Spin-echo modulation small-angle neutron scattering (SEMSANS) is based on the detection of spatial beam modulation, which is induced by triangular spin echo precession regions and subsequent spin analyses. In order to detect such signal and exploit it for small angle scattering investigations neutron detection with sub-millimeter spatial resolution is required. Here an approach is reported where instead of a position sensitive detector an absorption grating is used to analyze the beam modulation stepwise. The spin-echo length scan in this case is performed by varying the sample-to-detector distance. The real space correlation functions of reference sample structures in the range 10(2) nm, i.e. giving rise to small-angle scattering in the very small-angle range, are recorded and analyzed successfully. (C) 2012 Elsevier B.V. All rights reserved.
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