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Meeting Materials Science & Technology 2020
Symposium Synthesis, Characterization, Modeling and Applications of Functional Porous Materials
Presentation Title Hierarchical Porosity in δ-MnO2 Nanosheet Assemblies via Layer-tunnel Conversion
Author(s) Alec Ladonis, Peter Metz, Trevyn Hey, Peng Gao, Scott Misture
On-Site Speaker (Planned) Alec Ladonis
Abstract Scope Temperature induced layer-tunnel conversion of alkali free δ-MnO2 nanosheet agglomerates derived from highly crystalline potassium birnessite was systematically investigated. Assemblies dried from room temperature to 400C exhibit high specific surface areas between 90-130m2g-1. Scanning electron microscopy reveals crumpled newspaper-like morphology where the pore walls are comprised of single and restacked nanosheets which condense at higher temperatures to pore walls that have atomic-scale tunnels as in the alpha polymorph of MnO2. Raman spectroscopy and X-ray total scattering techniques elucidate structural trends throughout the conversion, where tunnel fragment formation below 100C occurs while the overall microstructure remains unaffected up to 400C. Pseudocapacitive effects due to the conversion were observed by cyclic voltammetry in Na2SO4 aqueous electrolyte where the intercalative pseudocapacitance diminishes with increased tunnel fragment formation. Overall, the results demonstrate that the conversion can be tailored for applications ranging from sequestering of nanosolids or aqueous ions to kinetically accessible Na+ ion intercalation.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

An Overview of High-temperature Ceramic-carbonate Dual-phase Membranes for CO2 Capture and Conversion
Compositional Influence on Kirkendall Pore Formation during Fabrication of Gamma Prime Strengthened Superalloy Microtubes
Crystallinity Effect on Mesoporous TiO2 Nanoparticle Negative Electrode Material for Metal Ion Batteries
Density Functional Theory Study of the Porous Metal-organic Framework Material Ni-Bpy-Me
Designing Multi-phase Reaction Pathways for CO2 Capture and Enhanced H2 Production from Ca- and Mg-bearing Precursors to Produce Stable Porous Carbonates Using Cross-scale X-ray Scattering Measurements
Development of Nanostructured Vycor Glass Microspheres for Doxorubicin Administration
Experimental Thermodynamics of Zeolites and Metal-organic Frameworks
Hierarchical Porosity in δ-MnO2 Nanosheet Assemblies via Layer-tunnel Conversion
Highly Controlled and Steerable Porosity for Ceramic Structures via Freeze Casting
Introductory Comments: Synthesis, Characterization, Modeling and Applications of Functional Porous Materials
Low/Intermediate Temperature Polysiloxane Derived Ceramics with Increased Carbon for Electrical Applications
Luminescent Metal-organic Framework-Based Sensors of Rare Earth Elements in Aqueous Streams
Porous Crystalline Porphyrinic Structures for Functional Materials Applications
Porous Organic Cage Composite Membranes for Post-combustion CO2 Separation
Surface Modified ScSZ-MC Dual-phase Membrane for Pre-combustion CO2 Capture
Synchrotron Structure and Sorption Properties of a Metal Organic Framework Compound Ni(3-methyl-4,4’-bipyridine)[Ni(CN)4] for CO2 Mitigation Application
The Influence of Yttria Content and Synthetic Parameters on the Thermal Stability of Yttria-stabilized Zirconia Aerogels
Thermodynamics of Naturally Occurring 2D and 3D Mineral Hosts: Zeolites, Layered Double Hydroxides and Clays

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