Metal ions diffusion through polymeric matrices: A total reflection X-ray fluorescence study |
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| Affiliation: | 1. Laboratorio de Química de Sistemas Heterogéneos, Facultad de Ingeniería, Universidad de Buenos Aires, P. Colón 850 (C1063ACU) Buenos Aires, Argentina;2. Unidad de Actividad Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499 (B1650KNA) San Martín, Buenos Aires, Argentina;1. Department of Chemical Engineering & Technology, Birla Institute of Technology, Mesra, Ranchi 835-215, India;2. Department of Chemistry, Birla Institute of Technology, Mesra, Ranchi 835-215, India;3. The Alan G. MacDiarmid NanoTech Institute, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, USA;4. Department of Chemistry, The University of Texas at Dallas, 800 W. Campbell Road, Richardson, TX 75080, USA;1. Chemical Engineering Department, Bharati Vidyapeeth University College of Engineering, Pune 411043, India;2. Chemical Engineering Department, Institute of Chemical Technology (ICT), Matunga, Mumbai 400019, India;3. CSIR-National Chemical Laboratory, Pune 411008, India;4. Chemical Engineering Department, N.I.T. Warangal, Andhra Pradesh 506004, India;1. University of Rostock, Institute of Physics, Albert-Einstein-Str. 23-24, 18059, Rostock, Germany;2. University of Rostock, Faculty of Interdisciplinary Research, Competence Centre CALOR, Albert-Einstein-Str. 25, 18059, Rostock, Germany;3. University of Rostock, Institute of Chemistry, Dr-Lorenz-Weg 2, 18059, Rostock, Germany;4. Samara State Technical University, 443100, Samara, Russian Federation;5. Kazan Federal University, 18 Kremlyovskaya Street, Kazan, 420008, Russian Federation;6. Prokhorov General Physics Institute of the Russian Academy of Sciences, GPI RAS, Vavilov St. 38, 119991, Moscow, Russian Federation |
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| Abstract: | This work proposes the use of X-ray fluorescence with total reflection geometry to explore the metal ions transport in aqueous hydrophilic polymer solutions. It is centered in the study of polymer concentration influence on ion diffusion. This subject is relevant to various and diverse applications, such as drug controlled release, microbiologic corrosion protection and enhanced oil recovery. It is anticipated that diffusion is influenced by various factors in these systems, including those specific to the diffusing species, such as charge, shape, molecular size, and those related to the structural complexity of the matrix as well as any specific interaction between the diffusing species and the matrix. The diffusion of nitrate salts of Ba and Mn (same charge, different hydrodynamic radii) through water-swollen polymeric solutions and gels in the 0.01% to 1% concentration ranges was investigated. The measurements of the metal concentration were performed by TXRF analysis using the scattered radiation by the sample as internal standard. Results are discussed according to different physical models for solute diffusion in polymeric solutions. |
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