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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 42 for “"Nano Indentation"”.
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Nano-indentation and Nano-scale imaging using atomic force microscopy: from single cell to single molecule
Abstract 1 TMEM43 is a protein embedded inside the inner nuclear envelope and cytoplasm, which is related to the LINC (linker of nucleoskeleton and cytoskeleton) complex. Studies indicates that the Ser358Leu mutation in the TMEM43 gene lead to arrhythmogenic right ventricular cardiomyopathy type V …
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Effect of Processing Parameters on Bond Strength and Effective Plasticity in Al2O3-TiB2 Composites
… obtained from the Logan collection to conduct nano-indentation measurements on polished sample surfaces in Al2O3 grains and in TiB2 grains. Indent locations were verified using SEM. Reduced modulus, final displacements, and fracture toughness for indents in Al2O3 grains and in TiB2 grains were …
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Study of the microstructure and mechanical properties of hummingbird wing-bones
… tomography, scanning electron microscopy, and nano-indentation experiments were conducted to determine if such anomalies existed. Additional macroscale measurements were taken to compare relative proportions of each of the bones of interest, which included the humerus, radius, and ulna. Upon …
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Multi-scale mechanics of monolayer graphene membranes : elasticity, fracture, and mechanochemistry
… as an ideal material for a broad range of nano-scale applications. The performance of any graphene-based device would depend upon the material's response to deformation and its intrinsic resistance to failure. Nano-indentation is a useful technique to obtain such information, but analysis …
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Investigations On Rf Sputter Deposited Sicn Thin Films For Mems Applications
… changing the N2/Ar gas ratios during sputtering. Nano-indentation studies were performed to investigate the mechanical properties such as hardness and reduced modulus of the SiCN films. Surface morphology of the films was characterized by using atomic force microscopy (AFM). X-ray photoelectron …
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Effect of silicon nano particles added to the polymeric coatings
… of a coatingto the same coating with added nano silica. The sample coating for this project was bis-ureasil which was synthesized using 1:1 equivalent ratio of bis (3-trimethoxysilyl-propyl) amine (BTMSPA) (318.0g) and IPDI (52.0g) in 400g of anhydrous THF. The other coating was prepared by …
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Crack growth resistance in nuclear graphite
… loss of binder phase. A preliminary study of the nano-indentation behaviour of the nuclear graphites reveals a similar response in all the materials. Anelastic hysteresis in the loadunload response is found with little residual deformation. There is also evidence of a creep effect during the dwell …
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Numerical and Experimental Study of Rock Fracture Creep Under Dry Conditions
… limestone were obtained from triaxial and indentation tests. The results indicate that linear elasticity and von Mises plasticity can reasonably well describe the contacting asperity deformation. Then, triaxial, micro- and nano-indentation creep tests were conducted, and their creep …
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Characterization of Material’s Elastic-plastic Properties Through Microindentation Testing with a Cylindrical Flat-tip Indenter
… its properties being characterized in a micro/nano scale. Traditional tests on the macro scale are impractical based on size of specimen and testing equipment. The Berkovich pyramidal sharp tip nano-indenter is not able to be used to find material's plasticity because as it is indenting the …
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Mechanics of deformation of carbon nanotubes
The deformation mechanics of multi-walled carbon nanotubes (MWCNT) and vertically aligned carbon nanotube (VACNT) arrays were studied using analytical and numerical methods. An equivalent orthotropic representation (EOR) of the mechanical properties of MWCNTs was developed to model the anisotropic …
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Computational and Experimental Nano Mechanics
The many advances of nano technology extensively revolutionize mechanics. A tremendous need is growing to further bridge the gap between the classical mechanics and the nano scale for many applications at different engineering fields. For instance, the themes of interdisciplinary and …
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Carbon nanotube surfaces for low force contact application
… properties of gold/multi-walled carbon nanotube (Au/MWCNT) composites: 1) a modified nano-indentation; and 2) a PZT actuator test rig. These apparatuses were used to mimic force-displacement and contact behaviour of the MEMS relay?s contact at a maximum load of 1 mN with dry-circuit and …
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Effect of Poisson’s Ratio on Material Properties Characterization by Nanoindentation with a Cylindrical Flat Tip Indenter
<p>Nano indentation technology is commonly used to determine the mechanical properties of different kinds of engineering materials. The young’s modulus of the materials can be calculated with the load depth data obtained from an indentation test with a known Poisson’s ratio. In this investigation …
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The effects of aging on cardiac mechanics
… cells with an atomic force microscope (AFM). The indentation results were interpreted by modeling the AFM probe as a blunted cone and determining an apparent elastic modulus (B) with classical infinitesimal strain theory (CIST). A commercially available finite element software package (ABAQUS) was …
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Mechanical and optical behavior of a novel optical fiber crack sensor and an interferometric strain sensor
… the coating stiffness directly on the fiber uses nano-indentation. Special sample preparation and testing procedures were developed for the measurement of very low modulus materials using the Nano Indenter II. Results are obtained for two different acrylate coated optical fibers, namely Corning …
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Development of high performance tribological coatings for application onto hip joint prostheses
… Hardness and fatigue was characterised using nano-indentation and the coating adhesion was measured using scratch testing. Application of the coatings resulted in a significant reduction in wear. Wear factors as low as 3.65x10¯18m³/Nm were achieved for coated CoCr substrates compared to …
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Design and fabrication of novel and functional 3D structures via proximity field nano-patterning
Proximity field Nano-Patterning (PnP) is a large-area interference lithography technique that is used to fabricate multi-dimensionally periodic micro-structures. Though a potent technique for 3D microfabrication that offers dual and superior advantage of scalable resolution and throughput, this …
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Catalytic properties, densification and mechanical properties of nanocrystalline yttria-zirconia-based materials
… onto or doped in cubic 7 mol% Y203-ZrO2 (7YZ) nanocrystals to form nanocomposites for methane combustion. These novel catalysts were very active and thermally stable. In particular, 25 wt% Mn203-coated 7YZ and 25 wt% Mn203-doped 7YZ showed remarkably low light-off temperatures of 3750C and …
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Silicon nanowire anode for lithium-ion batteries: fabrication, characterization and solid electrolyte interphase
… voltage and high energy density. Silicon nanowires are considered as lithium-ion battery anodes for their ultra high capacity at 4200 mAh·g-1 (10× higher than conventional graphite anode), as well as stress accommodation for reversible lithiation and delithiation. Silicon nanowires were …
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TI Nano Powder Speckle Pattern Creation and Use in DIC of ZnO Modified Single Carbon Fibers
… carbon fibers by growing zinc oxide (ZnO) nanorods in the fiber surface using a hydrothermal approach, increasing interfacial area and fiber-matrix friction. Macroscale evaluation has shown that the interfacial modification decreases the inter-ply movement and reduces the processing strains …
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