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 37 for “"chemomechanical"”.
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Development of Chemomechanical Functionalization and Nanografting on Silicon Surfaces
Progress in chemomechanical functionalization was made by investigating the binding of molecules and surface coverage on the silicon surface, demonstrating functionalization of silicon with gases by chemomechanical means, analyzing atomic force microscopy probe tip wear in atomic force microscopy …
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Chemomechanical modeling of hydrogen-induced degradation at high temperatures
Degradation of structural materials by hydrogen gas at high temperatures poses serious challenges to the safety of hydrogen technologies operating at elevated temperatures such as solid oxide fuel and electrolyser cells, hydrogen gas turbines, etc. The objective of this dissertation is to develop …
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Atomistic simulations of chemomechanical processes in nanomaterials under extreme environments
The complex chemomechanical behavior of nanomaterials under extreme thermal and mechanical environments is of interest for a range of basic science and defense applications. By the limitation of experimental approaches for objects of nanometer, novel computational methods have been developed to …
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Chemomechanical coupling and motor cycles of the molecular motor myosin V
… that the motor behaviour is governed by several chemomechanical motor cycles. In addition, we investigate the functional dependence of stepping rates on force by deducing the motor's response to external loads via an appropriate Fokker-Planck equation. For substall forces, the dominant pathway of …
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MODELING OF THE CHEMOMECHANICAL INTERACTIONS BETWEEN CELLS AND THE EXTRACELLULAR MATRIX
… health and functionality. Third, we introduce a chemomechanical model that elucidates the mechanism of the spatiotemporal evolution of cell redistribution during blood clot contraction. This model demonstrates how mechanosensitive signaling controls ATP hydrolysis in platelets, subsequently …
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Etching and chemomechanical polishing of compound semiconductors using halogen-based reagents
… X represents a halogen. The General Model for Chemomechanical Polishing is formulated on the basis of the three stages of reaction observed for all the reagents examined: Oxidation of the substrate; solvation/hydration of the oxidation products; removal of the products from the substrate …
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A multiscale framework for the chemomechanical characterization of ancient heterogeneous materials
Over the course of hundreds--or sometimes even thousands--of years, ancient building materials have survived environmental exposure, modifications, and restorations, often to an extreme degree. These processes, which have occurred from antiquity all the way to the present, have resulted in …
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Chemomechanical regulation of integrin activation and cellular processes in acidic extracellular pH
It is well established that extracellular pH (pHe) becomes acidic in several important physiological and pathological contexts, including the tumor and wound microenvironments. Although it is known that acidic pHe can have profound effects on cell adhesion and migration processes integral to tumor …
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Biological Ion Transporters as Gating Devices for Chemomechanical and Chemoelectrical Energy Conversion
… from cell membranes of plants, that use chemomechanical and chemoelectrical energy conversion processes to perform mechanical and electrical work. The chemomechanical energy conversion concept is implemented in a protein based actuator. The chemical energy is applied as an electrochemical …
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Quantifying effects of substrata chemomechanical properties on eukaryotic and prokaryotic cell adhesion and morphology
… thesis describes some of the first studies of chemomechanical coupling arising from anchorage-dependent forces between cells and a versatile class of chemically and mechanically tunable polymer thin films, termed polyelectrolyte multilayers. Specifically, investigation of the effects of …
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Effects of water on chemomechanical instabilities in amorphous silica : nanoscale experiments and molecular simulation
We elucidate the tensile failure mechanism of amorphous silica and the effects of water on the process, combining: (a) atomic force microscope (AFM) bending tests, (b) molecular dynamics (MD) simulation and (c) molecular orbital (MO) simulation. Bending tests of silica nanowires provide validation …
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Nano-ChemoMechanical assessment of Rice Husk Ash cement by wavelength dispersive spectroscopy and nanoindentation
Cement global production stands at 3 Giga tons making concrete the most consumed structural mateial worldwide. This massively produced material comes with a heavy environmental footprint rendering the cement industry contributing about 5% to global CO₂ emission. Rice Husk Ash (RHA) among many other …
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Myelination diseases of the central nervous system: Artificial Axons as in vitro models of chemomechanical cues
Myelination is a key biological process wherein glial cells such as oligodendrocytes wrap myelin around neuronal axons, forming an insulative sheath that accelerates signal propagation down the axon. A major obstacle to understanding myelination is the challenge of visualizing and reproducibly …
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Calcium-Silicate-Hydrate in cementitious systems : chemomechanical correlations, extreme temperature behavior, and kinetics and morphology of in-situ formation
… of properties of Calcium Silicate Hydrate: chemomechanical correlations, behavior under extreme temperature and pressures, and kinetics and nanostructure of in-situ formation. Calcium Silicate Hydrate (C-S-H) formed in-situ in concrete is believed to have a layered structure with silicate …
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Design and Analysis of End-Effector Systems for Scribing on Silicon
… investigates end-effector systems used in a chemomechanical scribing process. Chemomechanical scribing is a method of patterning silicon to selectively deposit a monolayer of material on the surface of the silicon. This thesis details the development of a unique end-effector for …
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Design, fabrication, and application of stimuli-responsive hydrogel actuators
… initiated stimuli-responsive actuators (chemomechanical actuators), and the other two systems are non-chemically initiated. In the chemomechanical systems, we explored relationships between different chemical systems and hydrogels, as well as the conversion of chemical energy into …
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Chemomechanics of non-stoichiometric oxide films for energy conversion
… strain, and elastic constants. This electrochemomechanical coupling, or interaction between functional properties, defect chemistry, and mechanical variables, can have important consequences for devices operated in extreme environments, where unexpected stress may lead to fracture, or …
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The preparation and characterization of thermo-sensitive colored hydrogel film and surfactant-free porous polystyrene three-dimensional network.
… This intelligent hydrogel might be used in chemomechanical systems and separation devices as well as sensors. Polymer adsorption plays an important role in many products and processes. In this thesis, surfactant-free three-dimensional polystyrene (PS) nanoparticle network has been prepared. …
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Force regulation in contractile cells by chemical and mechanical signaling
… epithe- lial cell force generation. Responses to chemomechanical signals that increase force by epithelial cells has been shown to increase metastatic potential in tumors. The need to understand how these signals affect force generation could provide new insights in identifying targets for …
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Chemomechanics at cell-cell and cell-matrix interfaces critical to angiogenesis
… microenvironments of the cell (i.e., the chemomechanical niche). Therefore, the biochemical reactions and conditions responsible for generating mechanical stresses and attendant cell behaviors may not be well represented in typical in vitro assays. In several key respects, particularly in …
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