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 “"nanomechanical properties"”.
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Nanomechanical properties of hydrated organic thin films
… F(D)), as well as the contact mechanical properties (e.g. elasticity, plasticity, fracture) of these two model systems under different solution conditions, in order to formulate a hypothesis for the molecular origins of the dominant interactions and furthermore, to gain a mechanistic …
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Nanomechanical Properties of Polymer-Grafted Nanoparticle Ultrathin Films
… In the past few decades, the mechanical properties of nanoparticle-filled polymer thin films have been studied rigorously, suggesting that the inclusion of nanoparticles in the polymer matrix enhances the elastic modulus of thin films. However, there’s still a window of opportunity for an …
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Spatial and temporal estimation of nanomechanical properties via Atomic Force Microscopy
… interest is the understanding of mechanical properties of complex systems at the micro and nanoscales. Current techniques for such measurements are hampered by challenges including their inability to probe systems in complex microenvironments, non-destructively, or at nanometer resolution. …
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Nanomechanical Properties and Nanowear Characterization of Thin Solid Films and Engineering Surfaces
"Reliable nanomechanical property and nanowear measurements have recently drawn significant attention, as thin solid films have been routinely used in various applications, such as semiconductor, magnetic storage and microelectromechanical systems, and their thickness has shrunk from as low as a …
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Ultrastructure and nanomechanical properties of aggrecan from native cartilage and engineered tissue
… structure of aggrecan single molecules and the nanomechanical properties of an end-grafted aggrecan monolayer were quantified. Adult human aggrecan showed significantly shorter GAG chains and core proteins as well as lower molecular stiffness compared to that of newborn aggrecan. After enzymatic …
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Reversible stimulus-responsive polymers for the control of the surface interfacial and nanomechanical properties
Surfaces with reversible stimulus-responsive properties have great potential for a wide variety of applications, such as transport, separation, and detection of biomolecules, controlled adhesion, friction, and lubrication in microfluidic systems, and force or displacement generation in micro- and …
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Determining Single Fiber Nanomechanical Properties of Electrospun Protein Fibers and Modified Fibrin Fibers Using Atomic Force Microscopy
… to specific applications. The mechanical properties
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Effect of thermal maturity on nanomechanical properties and porosity in organic rich shales (a Bakken shale case study)
… make them economical. Understanding the elastic properties of self-sourcing formations and their correlation with maturity can provide crucial information about amount of generated hydrocarbon, petrophysical properties and geomechanical characteristics from well logs and seismic surveys. As …
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Nanotribology and Nanomechanics Including Nanomechanical Properties, Adhesion and Surface Roughness With Application to Magnetic Storage Hard Disk Drives
… based analysis with consideration of mechanical properties and thickness of various sub-micron thick surface layers, effect of adhesion, effect of roughness and flash temperature was performed to study the impact between slider corner and disk surface. The above contact mechanics based analysis …
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A nanomechanical investigation of the crack tip process zone of marble
… the interaction between crack initiation and nanomechanical properties in the crack tip process zone (zone of microcracking at the tip of a propagating crack) of a brittle geomaterial. Samples of Carrara marble with pre-existing cracks ("flaws") were loaded in a uniaxial testing machine until …
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Efeito in vitro da erosão nas propriedades nanomecânicas de resinas compostas
… materials and change their superficial properties. The present study aimed to evaluate the effect of erosion with cola drink in the nanomechanical properties (nanohardness and elastic modulus) of dimethacrylate-resin and silorane-resin composites. Three compounds were investigated: …
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Role of Syk in the regulation of cytoskeleton and stress granules in breast cancer
… atomic force microscopy (AFM) was used to map nanomechanical properties of live MDA-MB-231 breast cancer cells either lacking or expressing Syk. The expression of Syk dramatically altered the cellular topography, reduced cell height, increased elasticity, increased viscosity, and allowed …
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Fracture process zone : microstructure and nanomechanics in quasi-brittle materials
… material, the assessment of the fundamental properties (microstructure, small-scale mechanical properties) of intact and FPZ quasi-brittle material, and a conceptual model of FPZ development in quasi-brittle material. In pursuit of these objectives, the study uses nanoindentation to probe the …
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Rheological and nanomechanical characterization of aging in polymer modified asphalt
In this study, change in rheological and nanomechanical properties of asphalt due to aging is determined in the laboratory. Asphalt binders are aged using Rolling Thin Film Oven (RTFO), Pressure Aging Vessel (PAV), and draft ovens. Asphalt binder includes an unmodified base binder, …
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Nanomechanics and ultrastructural studies of cortical bone : fundamental insights regarding structure-function, mineral-organic force mechanics interactions, and heterogeneity
… mineral content had a significant effect on both nanomechanical properties and ultrastructural deformation mechanisms of bone, partial and complete demineralization was carried out to produce samples ranging from -0-58 wt.% mineral content. Nanoindentation experiments perpendicular to the osteonal …
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Mapping of elastic modulus and hardness in Trochus niloticus seashell nacre by nanoindentation
… the topographical features with the properties distribution. The properties distribution maps revealed a non-uniform distribution of nanomechanical properties as well as highly-localized regions in which the values of the properties differed from the average values. Future studies may …
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Nanomechanics of cartilage extracellular matrix macromolecules
In this thesis, the shear and self-adhesion nanomechanical properties between opposing cartilage aggrecan macromolecules were probed. In addition, nanoscale dynamic oscillatory mechanical properties of cartilage and its type II collagen network was measured. Aggrecan shear nanomechanics was …
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Macro and nanocreep of self-consolidating concrete
… highly congested reinforcement. Due to its fresh properties, there has been growing interest in using SCC in precast and prestressed applications. These applications are known to be sensitive to time-dependent phenomena such as creep and shrinkage. Therefore, it is important to understand the …
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Rough Surface Interactions of Micro/nano-Scale Contact Systems
… to contact behavior have been studied. First, nanomechanical properties of ultra-thin carbon films such as hardness and elastic modulus have been investigated using a newly developed nanoindentation technique and custom-built high-resolution nanoindentation system, which enabled reliable …
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Nanoindentation characterization of clay minerals and clay-based hybrid bio-geomaterials
… of the Earth crust. Understanding mechanical properties of these aluminosilicates is crucial for seismic study, stability of parent rocks and geomaterials, and for geophysical subsurface exploration. Recently, growing prospects of clay based nanocomposites have renewed further interest in …
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