6 research outputs found
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The Role of Backbone Polarity on Aggregation and Conduction of Ions in Polymer Electrolytes
Discovering Synthesis Routes to Hexagonally Ordered Mesoporous Niobium Nitrides Using Poloxamer/Pluronics Block Copolymers
Discovering
Synthesis Routes to Hexagonally Ordered
Mesoporous Niobium Nitrides Using Poloxamer/Pluronics Block Copolymer
Recommended from our members
Glass Transition Temperature and Ion Binding Determine Conductivity and Lithium-Ion Transport in Polymer Electrolytes
Glass Transition Temperature and Ion Binding Determine Conductivity and LithiumIon Transport in Polymer Electrolytes
Self-Assembled Gyroidal Mesoporous Polymer-Derived High Temperature Ceramic Monoliths
Polymer-derived
ceramics (PDCs) have enabled the development of
nonoxide ceramic coatings and fibers with exceptional thermo-mechanical
stability. Here, we report the self-assembly based synthesis of gyroidal
(space group Q<sup>230</sup>, <i>Ia</i>3Ì…<i>d</i>) mesoporous silicon oxynitride ceramic monoliths by pyrolysis of
blends of commercially available preceramic polysilazane with a structure-directing
triblock terpolymer up to temperatures of 1000 °C. Monoliths
had pore diameters of 9.4 ± 1.1 nm and surface area of 160 m<sup>2</sup>/g. The three-dimensionally (3D) ordered periodic pore structure
of the as-made hybrids acts to relieve stresses by allowing the escape
of gases formed during ceramization. This process in turn enables
the retention of smooth monoliths during ceramization under ammonia,
a process that both adds nitrogen to the material and removes carbon
pyrolysis products. The monoliths are appealing for high-temperature
applications such as catalyst supports and microelectromechanical
system (MEMS) devices including gas and pressure sensors, as well
as strong, stiff, and creep-resistant scaffolds for ordered interpenetrating
phase composites