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 10 of 10 for “"crumpling"”.
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Statistical Mechanics of thermalized ribbons and sheets
… study the effects of thermal fluctuations on the crumpling transition of elastic sheets. Existing two-dimensional sheets have a crumpling temperature which is very high and the crumpling transition has not been observed experimentally. We propose a mechanism using which one can tune this crumpling …
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Numerical modelling in large strain plasticity with application to tube collapse analysis
… developed and applied to model the axisymmetric crumpling of circular tubes. New types of mixed elements (Triangles-Quadrilaterals for 2-D, Tetrahedra-Bricks for 3-D) are proposed for the spatial discretization. These elements model accurately incompressible plastic flow, without unwanted …
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Crumpled Graphene Oxide: Aerosol Synthesis and Environmental Applications
… five focus areas of this dissertation are: 1) Crumpling and thermal reduction of GO nanosheets in aerosolized droplets, 2) (Multi)functional nanocomposite synthesis, 3) Colloidal behavior in water as a function of material properties and selected environmental constituents/conditions, 4) …
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Fabrication and integration of graphene field effect transistors for advanced biosensing platforms
… biomolecules using crumpled graphene-based FET. Crumpling approach is compatible with low cost, low power, and scalable fabrication processes and has enhanced sensitivity conferred by its outstanding features such as large surface area to volume ratio, high carrier mobility, and mechanical …
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Buckling Patterns and Mechanics of Thin Interfacial Polymer Films
… bath three buckling modes arise: wrinkling, crumpling, and folding. This work shows that striking transitions between these states accompany four regimes in the force of indentation, two of which represent nonlinear responses to this loading. I use high precision force measurements to confirm …
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Integration of freestanding polyelectrolyte multilayer membranes in larger scale structures
… to 50 nm to structured surfaces and to avoid crumpling of the membrane. We could again use this technique to produce arrays of micron size. The freestanding membrane is a diffusion barrier for high molecular weight molecules, while small molecules can pass through the membrane and thus allows …
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From Spheres to Sheets: Colloidal Hydrodynamics, Thermodynamics, and Statistical Inference
… from stochastic flipping to significant crumpling and continuous tumbling consistent with the onset of chaotic dynamics found for athermal sheets. The effects of different dynamical conformations on rheological properties such as viscosity and normal stress differences are also quantified.
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Mechanical self-assembly of deformed 2D materials for advanced functionalities
… is achieved by material densification by crumpling the hybrid structure. As a result, we demonstrate 1200% enhanced photoresponsivity over a flat graphene device by combining the plasmonic effect and material densification. The crumpled structure also provides an exceptional 200% …
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Strain responsive systems based on deformed low dimensional materials for sensing and actuation
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2022-12-01
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Surface instabilities and interfacial phenomena for nanomanufacturing at the atomically-thin limit
Two-dimensional (2D) layered materials, exemplified by the prototypical graphene, have been intensively studied for their diverse material properties and superlative mechanical strength. Due to their atomically-thin nature, weak basal plane van der Waals interactions, and vanishing bending …