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Title: Structure factor of model bidisperse ferrofluids with relatively weak interparticle interactions

In the present manuscript we develop a theoretical approach to describe the pair correlation function of bidisperse magnetic dipolar hard- and soft-spheres. We choose bidisperse system as the first step to allow for polydispersity when studying thermodynamics of magnetic fluids. Using diagram technique we calculate the virial expansion of the pair correlation function up to the first order in density and fourth order in the dipolar strength. Even though, the radial distribution functions are extremely sensitive to the steric potential, we show that the behaviour of the isotropic centre-centre structure factor is almost indifferent to the type of the short-range repulsion. We extensively compare our theoretical results to the data of molecular dynamics simulations, which helps us to understand the range of validity of the virial expansion both on density and magnetic dipolar strength. We also investigate the influence of the granulometric composition on the height, width, and position of the structure factor first peak in order to clarify whether it is possible to extract structural information from experimentally measured small angle neutron scattering intensities.
Authors:
; ;  [1] ;  [2] ;  [1] ;  [3]
  1. Institute of Mathematics, Department of Mathematical Physics, Ural Federal University, Lenin av. 51, 620000 Ekaterinburg (Russian Federation)
  2. Institute for Computational Physics, UniversiƤt Stuttgart, Allmandring 3, 70569 Stuttgart (Germany)
  3. (Austria)
Publication Date:
OSTI Identifier:
22253807
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 139; Journal Issue: 22; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DENSITY; INTERACTIONS; LIQUIDS; MAGNETIC MATERIALS; MOLECULAR DYNAMICS METHOD; NEUTRON DIFFRACTION; SIMULATION; SMALL ANGLE SCATTERING; SPATIAL DISTRIBUTION; STRUCTURE FACTORS; THERMODYNAMICS