Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Gyroid"”.
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High performance curtain wall mullion section design with various densities of gyroid
… In particular, this thesis has selected a single-gyroid structure, which is an open cell foam structure that has the minimum surface area necessary to span a region of space. The thesis explores various aspects of the application that extend from a rapid modeling method of gyroid structure, …
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Characterization, orientation, and deformation behavior of the double gyroid phase in elastomeric triblock copolymers
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Ceramic nanostructures for block copolymers
… of this thesis is on the oxidation of the double gyroid and ''inverse" double gyroid morphologies using either ozone/uv and oxygen plasma techniques. By transmission electron microscopy (TEM) and atomic force microscopy (AFM), it is shown that the PI can be preferentially removed by oxidation …
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2D and 3D periodic templates through holographic interference lithography : photonic and phononic crystals and biomimetic microlens arrays
… structure, the FCC, and the non centrosymmetric Gyroid structures were demonstrated. The ability to make 3D structures over a large area, with low defect densities and periodicities on the sub/i scale opens a whole range of opportunities including such diverse areas as photonic crystals, phononic …
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Static and Dynamic Optimisation of Fluid-Filled Lattices for Responsive Orthotic Insoles
… loading conditions. The structural response of gyroid lattices are examined with experimental and numerical analyses with particular focus on the influence of geometric parameters on compressive behaviour. The behaviour of fluid flow within the lattice and the influence of different geometric …
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Computer simulations of tapered particles
… cubic phase, specifically the Ia3d or gyroid (G) as it is also known -a phase never before obtained from this type of simulation. Characterisation of the I-G transition was undertaken, which indicated that the gyroid freely selfassembled from precursors present in the isotropic fluid. …
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Selective laser sintering of bioactive glass scaffolds and their biological assessment for bone repair
… namely, cubic, spherical, X, diamond, and gyroid, were fabricated and assessed in vitro for a possible preferential cell proliferation. The MTT labeling experiments indicated that the scaffolds with diamond and gyroid pore geometries have higher curvature-driven MLO-A5 cell proliferation. …
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Elastic properties of architectured cellular materials and biological materials (equine hoof wall)
… In the first part of this thesis, the TPMS-based Gyroid-type cellular materials with varying porosities are investigated experimentally under compression. Specimens, few centimeters in size, were fabricated using selective laser sintering (SLS) with a PA2200 polymer. The elastic compressive …
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Block copolymer photonic crystals
… A copolymer forming the three dimensional double gyroid at optically relevant length scales and its reflective properties are presented as well. Experimental results document the initial observation of photonic optical properties related to the microstructure of a block copolymer. One …
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Additive manufactured biodegradable and biocompatible polymeric nanocomposite scaffolds for bone tissue engineering applications
… The biodegradation rates of the 3D printed Gyroid-designed nanocomposite PBTSs were estimated in sixty weeks of biodegradation, employing numerical, and experimental results. Machine learning methods were used to connect the independent experimental and numerical results and extract …
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Triply Periodic Minimal Surface Lattices for Mechanically Tuning Structures and Designing Multifunctional Devices
… fields, etc. I present a multifunctional double gyroid capacitor that is designed for three functions (1) load bearing, (2) energy storage, and (3) self-sensing deformations. To characterize the load bearing capabilities, I studied the mechanical properties of four elastomeric gyroid unit cells. …
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Part I - Access to UV photocured nanostructures via selective morphological trapping of block copolymer melts. Part II - Morphological phase behavior of poly(RTIL) containing block copolymer melts
… hexagonally packed cylinders (C), bicontinuous gyroid (G), and an isotropic disordered state (Dis). Modification of the PI-PEO backbone with epoxy groups and addition of a UV cationic photoacid acted only to shift transition temperatures quantitatively, leaving the overall morphological behavior …
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Orientation and Phase Behavior of Block Copolymers in External Electric Fields
… behavior of block copolymers. It is shown that a gyroid phase (G) as well as a hexagonally perforated lamella phase (HPL) exposed to an electric field undergo a phase transition to cylinders (C) and lamellae (L), respectively. Furthermore, an anisotropic deformation of the chain conformation in …
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Thermal modulation during solvent annealing of PS-PDMS block copolymer
… structures such as spheres, cylinders, and gyroid, to metastable structures such as hexagonal perforated lamellar (HPL). A variety of processing techniques including solvent vapor annealing (SVA) have been developed in order to facilitate the phase transitions of BCPs from disordered to …
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ADDITIVELY MANUFACTURED METALLIC CELLULAR STRUCTURES
… using both the additively manufactured gyroid and diamond cellular structures. The performance of the non-traditional sandwich panels was compared against a traditional sandwich panel manufactured using an additively manufactured honeycomb core. Numerical models (unit-cell homogenization …
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Development of Lattice-Augmented Fuels for Hybrid Rocket Applications
… A novel process of generating three-dimensional gyroid surfaces with the desired properties has been developed that allows for lattices to be manufactured using fused deposition modeling (FDM) from a variety of thermoplastics. The application of lattice-augmented fuels to hybrid rocket systems at …
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Multi-Scale Design, Thermal Simulation, Fabrication, Surface Engineering and Characterization of TPMS Structures for Atmospheric Water Generation
… through film-wise condensation. In contrast, the Gyroid and Lidinoid geometries showed significant performance improvements after surface treatment, enabling efficient dropwise condensation. This research represents a significant engineering milestone by combining insights from geometry design, …
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Controlling nanostructures of globular protein-polymer block copolymers in bulk solutions and in thin films
… polymer block are found to form a double gyroid structure with Ia3d symmetry, as opposed to perforated lamellae of bioconjugates with a strongly segregating polymer block. Common phase behaviors are also revealed, including the order of lyotropic order-order transitions and a re-entrant …
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Network morphologies in monodisperse and polydisperse multiblock terpolymers.
… transition from lamellae to the coreshell gyroid network. This result demonstrates that polydispersity can be used to tune block terpolymer phase behavior and stabilize technologically useful network mesostructures. Self-consistent field theory calculations augment the experimental analysis …
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