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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Polyene-Free Photoluminescent Polymers via Hydrothermal Hydrolysis of Polyacrylonitrile in Neutral Water
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Selective Ring-Opening Allene Metathesis: Polymerization or Ruthenium Vinylidene Formation
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Origins of Lithium/Sodium Reverse Permeability Selectivity in 12-Crown-4-Functionalized Polymer Membranes
Direct lithium extraction via membrane separations has been fundamentally limited by lack of monovalent ion selectivity exhibited by conventional polymeric membranes, particularly between sodium and lithium ions. Recently, a 12- Crown-4-functionalized polynorbornene membrane was shown to have the largest lithium/sodium permeability selectivity observed in a fully aqueous system to date. Using atomistic molecular dynamics simulations, we reveal that this selectivity is due to strong interactions between sodium ions and 12-Crown-4 moieties, which reduce sodium ion diffusivity while leaving lithium ion mobility relatively unaffected. Furthermore, the ion diffusivities in the membrane, when scaled by their respective solution diffusivities and free ion fractions, can be collapsed to an almost universal relationship depending on solvent volume fraction.
Cocrystalline Polymer Films Exhibiting Second-Order Nonlinear Optical Properties
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Diffusion of Short Semiflexible DNA Polymer Chains in Strong and Moderate Confinement
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In Situ Atomic Force Microscopy Tracking of Nanoparticle Migration in Semicrystalline Polymers
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Alternating Methyl Methacrylate/ n -Butyl Acrylate Copolymer Prepared by Atom Transfer Radical Polymerization
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Modeling Microstructure Formation in Block Copolymer Membranes Using Dynamical Self-Consistent Field Theory
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Coarse-Grained Modeling of Polymer Cleavage within a Porous Catalytic Support
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