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Showing 1 to 15 of 15 for “"Inverse opals"”.
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Thermoelectric properties of polysilicon inverse opals
… for polycrystalline silicon structured as an inverse opal. An inverse opal provides nanoscale grains and a thin- lm like geometry to scatter phonons preferentially over electrons. Using solutions to the Boltzmann transport equation for electrons and phonons, we show that the gure of merit at …
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A Study on the Use of Inverse Opals Composed of Zinc Oxide Aggregate Popcorn Particles to Improve the Efficiency of Dye- Sensitized Solar Cells
… used to assemble the popcorn particles into an inverse opal structure. This is a unique application of EPD, which has previously been used to infiltrate nanoparticles (d ≤20nm range) Into opal templates, demonstrating the applicability of the technique to Nanoparticle aggregates (d ≥ 200 nm …
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Electrodeposited macroporous vanadium oxide Li-ion battery materials
… of 3D macroporous vanadium oxide inverse opals and binary inverse opals on transparent conducting oxide substrates and stainless steel and thermally oxidized stainless-steel substrates. The electrodeposition follows a diffusion limited growth mode to form 3D porous crystalline V2O5 …
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Two -Photon Polymerization of Defects in Photonic Crystals
… template for the final structure---a silicon-air inverse opal (which may exhibit a complete PBG) with embedded air defects. Embedded planar defects in silicon colloidal photonic crystals were optically characterized and high resolution embedded air defects in silicon-air inverse opals were …
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Rational Fabrication of High-Performance and Scalable Opal Crystals for Thermo-Fluidic Applications
Inverse opals have continuously attracted interest as a scalable, ordered porous material capable of enhancing energy, fluid, mass, or ion transport in a wide variety of applications. In particular, in heat transfer applications they have been used as porous coatings for condensers and boilers for …
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Ordered macroporous metal oxides and carbonaceous composites for Li-ion and beyond Li-ion batteries
… ordered macroporous materials, specifically inverse opal materials, for electrochemical energy storage systems, particularly rechargeable batteries. Exploring the potential of composite structures, this research focuses on TiO2/GeO2 nanocomposites and C/TiO2 inverse opal anodes in Li-ion …
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Three-dimensional periodic structures for enhancing light-matter interaction and energy storage
… at specific locations inside 3D silicon inverse opal photonic crystals (PhCs), allowing the coupling between high dielectric contrast PhCs and localized emitters to be investigated. Transfer-printing was next used to assemble a new type of 3D PhC vertical microcavity consisting of a …
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Polymer and metallodielectric based photonic crystals
… sub-micron spheres were used to produce opals, inverse opals and 3D metallodielectric photonic crystal (MDPC) structures. The fabrication of MDPCs with Au nanoparticles attached to the PMMA spheres core–shell particles is described. Various alternative procedures for the fabrication of …
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Electrical and thermal transport in 2- and 3-dimensional periodic holey silicon
… thermal conductivity of 3D periodic silicon inverse opals. Beside the anticipated low thermal conductivity due to high porosity, we observed an anomalous T1.8 dependence at low temperatures, distinct from the typical T3 behavior of bulk polycrystalline silicon. Using phonon scattering theory, …
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Machine learning methods for architected materials
… as a fast and scalable manufacturing method of inverse opals. We study vibration-induced crystallisation of balls across a range of conditions to uncover the mechanisms of crystallisation. These findings guide us to develop vibration-free epitaxial processes which can be used to build large …
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Guiding of plasmons and phonons in complex three dimensional structures
… dielectric nanostructures: silicon inverse opals. Such structures represent a three-dimensional “phononic crystal” but affect heat flow instead of acoustics. The thermal conductivity of inverse opal films are relatively low, ~0.6-1.4 W/mK at 300 K which is due to macroscopic bending …
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Design and applications of 4-yl-(methyl)coumarins and their derivatives
… three-dimensional structures such as artificial opals by taking advantage of the photonic properties of these materials. Functionalization, photochemical conversion, and labeling within inverse opals was performed and characterized using confocal fluorescence microscopy. Alternative labeling and …
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Effect of roughness, microstructure, and chemistry on the environmental durability of structural alloys
… functional metallic structures like Ni inverse opals. It resulted in a thermal stability enhancement by 500 oC, comparable to refractory metals in the same configuration. And also improved both the modulus and hardness of these structures.
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Advancing porous heat transfer materials and polymer coatings with photonic structures
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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Macroporous metal oxide battery electrode performance analysis and operando spectroscopy
… the structural parameters of the crystal. Opals are a type of PhC which are used as templates for inverse opals (IOs), which have shown promise as battery electrodes due to their high surface area to volume ratio, thin pore walls and interconnectivity, which removes the need for conductive …