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Long-range density fluctuations in orthoterphenyl as studied by means of ultrasmall-angle x-ray scattering

Long-range density fluctuations in orthoterphenyl as studied by means of ultrasmall-angle x-ray scattering

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics 61(6 Pt B): 6909-6913

The structure factor of a fragile glass-forming liquid orthoterphenyl was measured in the previously inaccessible intermediate q range between the conventional light scattering (LS) and small-angle x-ray scattering (SAXS) q ranges using the low-angle scattering beam line at the European Synchrotron Radiation Facility. At low q the structure factor exhibits an excess scattering and matches well the LS data. This excess scattering is due to long-range density fluctuations also observed in the isotropic component of scattered light. At high q the structure factor decays to a plateau corresponding to the isothermal compressibility in agreement with the conventional SAXS data. In the intermediate q range, the structure factor exhibits a power law q dependence which indicates that the excess scattering is due to fractal aggregates of denser domains.

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Accession: 046567084

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PMID: 11088383

DOI: 10.1103/PhysRevE.61.6909

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