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 133 for “"SEM images"”.
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Sandstone pore structure--a quantitative analysis of digital SEM images
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1987.
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Moisture diffusion through neat and glass-fiber reinforced vinyl ester resin containing nanoclay
… due to the presence of nanoclay in polymer. SEM images of FRPs were taken after two months of immersion in distilled water at room temperature. The SEM images revealed that the presence of clay indeed protected the glass-fibers. Effect of temperature was studied by conducting transient …
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Synthesis and analysis of carbon nanowalls and their raman spectroscopy
… Spectroscopy and Scanning Electron Microscope (SEM) images. Also the need of using catalyst in CNW has been analyzed. The intensities of D and G bands obtained from Raman spectrum have been related to the length of Graphene walls, to study the CNW's length on different substrates. The growth was …
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Modeling tin sulfide grain growth during post-processing
Tin sulfide (SnS) is a semiconductor material with both an indirect and direct bandgap at 1.1 eV and 1.3 eV respectively. Due to the availability of tin and sulfur, SnS is seen as a feasible alternative to the thin film CIGS and CdTe solar cells. With a direct bandgap of 1.1 eV and the ability to …
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Growth of anodic alumina nanopores and titania nanotubes and their applications
… closed and opened. By combining FIB cutting and SEM imaging to create a series of 2D cross section SEM images, 3D reconstruction can be obtained by stacking SEM images together. This 3D reconstruction offers an opportunity to directly and quantitatively observe the pore evolution to understand …
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Development of a Novel Grease Resistant Functional Coatings for Paper-based Packaging and Assessment of Application by Flexographic Press
… of the developed coating materials are made. SEM images along with contact angle data suggest that coating performance is probably attributable to decreased mean pore size in conjunction with a slightly increased surface contact angle facilitated by crosslinking of PVA molecules by both borate …
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From clay slurries to mudrocks : a cryo-SEM investigation of the development of the porosity and microstructure
… to a wide range of effective stresses. Cryo-SEM and conventional SEM techniques are used to investigate the microstructure of the clay slurry and resedimented mudrocks. Cryo-SEM enables the imaging of samples in their in-situ conditions, while conventional SEM is used to image oven-dried …
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Mechanical reinforcement of polyacrylamide hydrogels using pristine single-walled carbon nanotubes
… remained excellent stability after two months. SEM images from previous research and fragments of gels after compression tests have shown that the enhancement is based on increased micro-networks in the porous structure of hydrogels and decreased stress concentration. Some phenomena, such as …
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Synthesis and characterisation of hybrid Zn0-carbon nanostructures for potential applications in hydrogen storage
… of ZnO-CNFs. Scanning electron microscopy (SEM) was used to study the surface morphology of all samples (ZnO NPs, ZnO NRs and ZnO-CNFs). The results from SEM images showed that the size of ZnO NPs increased with deposition time and ZnO NRs morphology depended on the seeding particle sizes. …
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Lime treatment to improve frictional resistance and stability of stiff clay slopes
… environment, Scanning Electron Microscopy (SEM) images as a direct measure of particle size, shape and arrangement, Atterberg plastic limit and liquid limit as indirect measures of changes in particle size and shape, and fully softened friction angle and residual friction angle, are used to …
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New catalysts for syngas production from carbon dioxide and methane
… suggest a phase transformation to WC+Co+C. SEM images suggest formation of encapsulated carbon and whisker carbon.;The kinetics of CH4/CO2 reforming was studied under differential conditions over 500--600°C. The observed rates seem to follow a Langmuir-Hinshelwood type of reaction …
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Electrochemical and microstructural studies of AlPO₄-nanoparticle coated LiCoO₂ for lithium-ion batteries
… show a rise in Re above 4.5V. Structurally, SEM images show pitted surface morphology only on the edges of the layers of coated LiCoO₂.
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Gypsum scale formation on a heated copper plate under natural convection conditions and produced water remediation technologies review
… significant at lower degrees of supersaturation. SEM images of scale samples show needle-like crystals, the thinnest of which formed at a supersaturation index of 2.0. The classical nucleation theory of Mullin provides an excellent fit for the results. Interfacial energies calculated out of this …
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Conductive PEDOT:PSS fibres for modelling and assessing oligodendrocyte ensheathment
… Examination of Scanning Electron Microscopy (SEM) images reveals that oligodendrocytes adhere to these fibres, extend their cell membranes, and ensheath the fibres. Immunofluorescence images further indicate that the oligodendrocyte expresses Myelin Basic Protein (MBP), which is a …
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Determination of pool boiling Critical Heat Flux enhancement in nanofluids
… coefficients in the two-phase flow regime. SEM images show a porous coating layer of nanoparticles on wires subjected to nanofluid CHF tests. These coating layers change the morphology of the heater's surface, and are responsible for the CHF enhancement. The thickness of the coating was …
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Fabrication and Characterization of Polyimide-based Mixed Matrix Membranes for Gas Separations
… with each other through hydrogen bonding. Both SEM and TEM images revealed good contact between the polyimide and the zeolite. Permeability studies showed a drop in He permeability suggesting there were no voids between the two components. While simple gases such as O2 and N2 followed effective …
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Intraoral Corrosion of Self-ligating Metallic Brackets and Archwires and the Effect on Friction
… examined under a scanning electron microscope (SEM). Based on a 1-factor MANOVA, there was no significant group effect (all p>0.05) on frictional forces. Partial eta squared values indicated that intraoral exposure had only a small effect on frictional forces (≤ 3%). Qualitative analysis of SEM …
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Sensing Molecular Adsorption Through Interfacial Electron Scattering in Atom -Scale Junctions
… on conductance measurements and estimates from SEM images, atom-scale junctions were successfully formed. Lewis bases were introduced to atom-scale junctions, and the resulting alternating current impedance change was measured. For example, the interfacial scattering from chemisorption of 10 mM …
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A self-assembling peptide scaffold functionalized for use with neural stem cells
… of a biological scaffold formed by the self-assembling peptide RADA16 is comparable to the most commonly used synthetic materials employed in the culture of neural stem cells. Furthermore, improvements in the performance of RADA16 have recently been made by appending the self-assembling peptide …
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The effect of mica on the aging of asphalt binder
… examined with the Scanning Electron Microscope (SEM). Bending Beam Rheometer (BBR) and nanoindentation tests are conducted on mastics mixed with one of the binders and various concentrations of mica-fines aged at different levels. In this study, SEM images of mastic are taken. During the mixing …
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