Small-angle neutron scattering studies on binary mixtures of polystyrene and perfluorinated particles |
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| Affiliation: | 1. School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, UK;2. Department of Chemistry, King''s College, Strand, London WC2R 2LS, UK;1. Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, University of Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain;2. Neutron Imaging and Activation Group, Paul Scherrer Institute, 5232 Villigen, Switzerland;1. Helmholtz-Zentrum Berlin GmbH, Institute of Applied Materials, Hahn-Meitner-Platz 1, 14109, Berlin, Germany;2. Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-3: Electrochemical Process Engineering, 52425, Jülich, Germany;3. Technical University of Berlin, Hardenberg Str. 36, 10623, Berlin, Germany;4. Faculty of Mechanical Engineering, RWTH Aachen University, Germany;1. Nanomaterials and NanoManufacturing Laboratory, Department of Industrial Engineering, Texas Tech University, Lubbock, TX 79409, United States;2. Department of Mechanical Engineering, University of New Orleans, 2000 Lakeshore Drive, New Orleans, LA 70148, United States;3. Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409, United States;1. Advanced Energy Technology Center, Nanjing University of Posts and Telecommunications (NUPT), Nanjing 210046, China;2. Wuhan National Laboratory for Optoelectronics (WNLO)-School of Physics, Huazhong University of Science and Technology (HUST), Wuhan 430074, China;3. School of Materials Science and Engineering (SMSE), Nanjing University of Posts and Telecommunications (NUPT), Nanjing 210046, China;4. Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430068, China |
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| Abstract: | Small-angle neutron scattering measurements (SANS) studies have been carried out on binary mixtures of small polystyrene particles (radius 315 Å) and larger perfluorinated particles (radius 664 Å). Both types of particles were spherical, monodisperse and negatively charged in the aqueous conditions used. Electrostatic interactions between the particles in each type of dispersion were examined by determining the structure factor of the dispersions. Good agreement with the experimental data and theory were obtained with the rescaled mean-spherical-approximation-model (RMSA). An alternative approach for predicting the structure factor using an equivalent hard-sphere model also gave good agreement with the experimental data. In the case of binary mixtures, with the FEP particles contrast matched, the radial distribution function indicated extensive ordering of the polystyrene particles. In addition there was evidence, at high number ratios of small particles, of cluster formation of small particles with some rejection of these from the ordered arrangement. |
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