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Segregation of Factors Leading to Temperature-Dependent Ion Transport in Mixed Cationic Systems in Cation Exchange Membranes.
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Chemical Sciences Department, Homi Bhabha National Institute, Mumbai 400094, India.
This study delves into the interplay of temperature, composition, tortuosity, and electrostatic interactions on ion diffusion within cation exchange membranes. It explores the temperature dependence (16-60 °C) of the self-diffusion coefficients (SDCs) of Ba and Eu ions within the Nafion 117 cation exchange membrane, particularly in the presence of Na ions. Radiotracer techniques and electrochemical impedance spectroscopy were employed to investigate these SDCs.
View Article and Find Full Text PDFSelf-Diffusion of Star and Linear Polyelectrolytes in Salt-Free and Salt Solutions.
Macromolecules
January 2025
Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77840, United States.
This work explored solution properties of linear and star poly(methacrylic acids) with four, six, and eight arms (PMAA, 4PMAA, PMAA, and 8PMAA, respectively) of matched molecular weights in a wide range of pH, salt, and polymer concentrations. Experimental measurements of self-diffusion were performed by fluorescence correlation spectroscopy (FCS), and the results were interpreted using the scaling theory of polyelectrolyte solutions. While all PMAAs were pH sensitive and showed an increase in hydrodynamic radius ( ) with pH in the dilute regime, the of star polymers (measured at basic pH values) was significantly smaller for the star polyacids due to their more compact structure.
View Article and Find Full Text PDFExploring Dynamics and Intermolecular Interactions in Binary Mixtures of Reline and DMSO: An Investigation Using Nuclear Magnetic Resonance and Infrared Spectroscopic Techniques.
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College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
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View Article and Find Full Text PDFThe influence of temperature and pressure on the self-diffusion characteristics and mechanical sensitivity of DNTF: a molecular dynamics study.
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School of Safety Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Context: 3,4-Bis(3-nitrofurazan-4-yl) furoxan (DNTF) is a typical low-melting-point, high-energy-density compound that can serve as a cast carrier explosive. Therefore, understanding the safety of DNTF under different casting processes is of great significance for its efficient application. This study employed molecular dynamics simulations to investigate the effects of temperature and pressure on the self-diffusion characteristics and mechanical sensitivity of DNTF.
View Article and Find Full Text PDFEnhanced Efficiency of Anionic Guerbet-Type Amino Acid Surfactants.
Langmuir
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Research Focus Area for Chemical Resource Beneficiation, Catalysis and Synthesis Research Group, North-West University, 11 Hoffman Street, Potchefstroom 2522, South Africa.
This study investigates the surfactant properties and efficiency of linear and Guerbet-type amino acid surfactants. Utilizing a Wilhelmy plate method, we assessed the colloidal efficiency of these surfactants, with the lowest observed critical micelle concentration at 0.046 mmol L, significantly reducing surface tension to as low as 25.
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