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 206 for “"nanoporous"”.
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Nanoporous Platinum
Dealloying is a corrosion process in which one or more elements are selectively removed from an alloy leading to a 3-dimensional porous structure of the more noble element(s). These porous structures have been known to cause stress corrosion cracking in noble metal alloy systems but more recent …
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Bimetallic Nanoporous Sponges
Nanoporous silver (np-S) is a promising nanomaterial with unique physical properties distinct from its bulk counterpart, including high surface area, enhanced chemical sensing and tuneable optical and electrical properties. This thesis explores the fabrication and characterisation of np-S thin …
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Evaporation from nanoporous membranes
… In this thesis, we investigated evaporation from nanoporous membranes. The capillary wicking of the nanopores supplies liquid to the evaporating interface, passively maintaining the thin film. Different evaporation regimes were predicted through modeling and were demonstrated experimentally. Good …
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Stability of Nanoporous Metals
A study of the stability of bicontinuous nanoporous metals is presented. Atomic scale simulations are used to probe the dominant mechanisms of geometric relaxation in these materials. A method is presented for generating model bicontinuous metal / void structures for use in atomistic simulations of …
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Toxic Gas Sensing on Nanoporous Carbons
<p>Activated carbons, either synthetic, developed in our laboratory, or commercial, were prepared or further modified, in order to introduce specific heteroatoms such as oxygen, nitrogen and sulfur to their matrices. Chips coated with thin layers of the carbon samples were used for the sensing of …
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Vapour-Liquid Equilibria within Nanoporous Media
… to the exploration of fluid phases confined in nanoporous materials using Nuclear Magnetic Resonance (NMR) techniques, with an aim to benefit catalysis research. Included in this report are studies of pure fluids and their mixtures, confined in titania and silica catalyst supports. These …
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Computational Techniques for Studying Nanoporous Materials
… accelerate the discovery and characterization of nanoporous materials. Chaper 1 introduces the field of nanoporous materials/reticular chemistry, provides a brief history of molecular simulation in reticular chemistry, and finally, discusses some key challenges that need to be addressed from a …
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Sillica Nanoporous Materials Adsorption and Release Study
<p>The lower efficiency of the current common ways of delivering drugs to humans like oral administration and injection make it necessary to find more efficient delivery systems. In this regard, a class of nanostructured materials called mesoporous silicates such as MCM-41, SBA-15 has attracted the …
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Nanoporous Gold: Mechanics of Fabrication and Actuation
This thesis investigates fabrication methods for Nanoporous Gold (NPG), the complex nature of the film stress evolution in thin films during their fabrication and during surface charging. Fabrication of microstructures comprised of NPG requires a precise control over selective corrosion of the …
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Molybdenum disulfide nanoporous membranes for water desalination
… from 20 to 60 A^2. Water flux through the nanoporous MoS2 membrane is found to be 2 to 5 orders of magnitude greater than that of other known nanoporous membranes (MFI-type zeolite, commercial polymeric seawater Reverse Osmosis (RO), brackish RO, Nanofiltration and High-flux RO). Pore …
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Nanoporous dialysis membrane for microfluidic neural probes
… characterization of two potential candidates, nanoporous graphene membrane and nanoporous silicon membrane, for the dialysis membrane in a neural probe. For both membranes, after the process of fabrication and transfer, the intactness is inspected. Nanoporous graphene membranes have a …
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Nanoporous Silicon in Gas Preconcentration and Sensing
… applications. To that end, the potential of nanoporous silicon as a ‘preconcentrator’ to solve some of these challenges is investigated, by adsorbing molecules inside the pores before releasing them in a pulse into a gas detector, improving its effective sensitivity. This technique is applied …
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Topological characterization of nanoporous gold during coarsening
Previous studies of nanoporous gold have found that, during the coarsening process, the genus per characteristic volume of nanoporous gold has remained constant. Using a rolling-ball type algorithm, in which a test probe rolls over the surface to identify atoms, several test structures and a …
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Nanoporous graphene as a water desalination membrane
… the relationship between the atomic structure of nanoporous graphene and its membrane properties in RO applications. We then investigate the thermodynamics, chemistry and mechanics of graphene and the water and salt surrounding it. Finally, we establish the system-level implications of graphene's …
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Nanoporous carbon from corn cobs and its application
… acid or potassium hydroxide can lead to nanoporous carbon having surface area in excess of 3800 m²/g and pore volume of 2.5cc/g. Dried, crushed, corn cobs were carbonized at temperatures between 450- 900⁰C and chemically activated using H₃PO₄ and KOH. The effect of different variables of …
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Molecular Dynamics Of Ionic Liquids In Nanoporous Electrodes
… of ionic liquids (ILs) confined inside different nanoporous materials. These systems have potential uses in environmental and energy applications. The main goal is to understand how these IL properties are affected by a) characteristics of nanoporous materials such as chemical nature of the pore …
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Entrance effects on solution transport through nanoporous membranes
Solution transport across nanoporous membranes occurs in many different biologically and industrially relevant processes such as filtration of waste by the kidneys and desalination of seawater. The same theoretical framework can be used to understand both of these processes, as well as many others. …
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Nanoporous flexographic printing : fundamentals, applications and scale-up
… printed feature dimensions can be achieved when nanoporous stamps are used instead of traditional non-porous polymer stamps.
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