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 76 for “"area-to-volume ratio"”.
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The Effect of Particle Surface Area to Volume Ratio on Ion Release from CoCr Spheres
… implants are selected largely for their low volumetric wear rate, durability, and resistance to corrosion. In spite of these advantages, little is known concerning the long-term consequences of heavy metal alloy use in the body, although early research indicates potentially carcinogenic …
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The use of nanowires for the production of a power Schottky diode
… a number of diverse ways, and probably yet to be invented methods, to reduce the worlds energy consumption. Therefore more energy efficient electrical and electronic devices, and equipment, can play a major role in this. Although their individual contribution is small, due to their mass …
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Total Surface Area in Indoor Environments
… reactions, involve interactions with surfaces. To accurately describe the surface-area-to-volume ratio in a room, we have characterized the surface area, volume, shape, and material of objects in five bedrooms, four kitchens, and three offices. Averaged over all types of rooms, the ratio of …
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Aqueous Atmospheric Species, a Dual Study: 1. Comparison of the Effects of Temperature, Oxygen Level, Ionic Strength, and pH on the Reaction of Benzene with Hydroxyl Radicals at the Air-water Interface to the Bulk Aqueous Phase. 2. Determination of Carbonyl Compounds in Fog Water Samples via Online Concentration and HPLC
… which can have an exceptionally high surface area-to-volume ratio, also have a large range of physical and chemical properties (e.g. temperature, pH, ionic strength, and chemical composition) based on location, time of day, and emission source. Unlike larger atmospheric droplets, which are …
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Drawn Polymer Fiber Recuperative Heat Exchangers
… lightweight, flexible, and have a large surface-area-to-volume ratio. Initial tests on a Joule-Thomson cryocooler with a heat exchanger of overall dimension of 2.5mm x 2.5mm x 400mm with nitrogen as a working fluid were performed. Nitrogen was successfully liquefied with a mass flow rate of 34 …
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Sodium Fluoride Hopper Crystals
… crystals of sodium fluoride with a high surface area to volume ratio were prepared by the addition of an aqueous solution of sodium fluoride to an antisolvent method using ethanol. Key variables in the preparation of these crystals included the amount of water present in the antisolvent, the …
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Fabrication, Characterization, and Transport Analysis of Silicon-Based Microsystems: Micro Fuel Cells and Micro Gas Perconcentrators
… we have developed a muGPC that helps gas detectors sniff a trace amount of toxic vapors by increasing their concentration via adsorption and thermal desorption. Integration with electrostatic microvalves enabled the muGPC to achieve extremely small dead volumes and fast injection times while …
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Development of a microchannel reactor model
… inhibited by problems associated with hydrogen storage. A possible alternative is to store and then reform hydrocarbons to yield hydrogen in an on-board fuel processing system. Microchannel reactors have reduced mass and heat transfer limitations and are able to exploit fast intrinsic kinetics. …
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The degradation of gel-spun poly(beta-hydroxybutyrate) fibrous matrix
… matrix, PHB(FM), which has a similar appearance to cotton wool, possesses a relatively complex structure which combines a large volume with a low mass and has potential for use as a wound scaffolding device. As a result of the intrinsic problems presented by this novel structure, a new …
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Nanocrystallization confined to porous matrices with and without surface functionalization effects
… drug discovery and development, are a challenge to the pharmaceutical industry given their low bioavailability. One way to address this issue is to generate nanocrystals of these APIs. Nanocrystals have a significantly increased surface area to volume ratio as compared to standard micron-sized …
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Investigation of ion transfer efficiency through multi-channel capillaries for a Desorption Electrospray Ionization (DESI) interface
… experimented with different capillary geometries to maximize the signal intensity of analyte peaks obtained through DESI by improving the temperature uniformity throughout the capillary flow. Multi-channel capillaries were discovered to be more sensitive to temperature and less prone to turbulence …
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Genipin-crosslinked electrospun collagen nanofibers
… tissues, using patient-derived cells, in order to restore, maintain or improve existing tissue function. In traditional tissue engineering, tissues are grown in-vitro prior to insertion in the body, and thus a scaffold is needed to support and guide the cells during growth. Nanofibrous scaffolds …
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Development of an Enzyme-Linked ImmunoSorbent Assay (ELISA) with Enhanced Sensitivity in a Nanofluidic System
Experimental studies were performed to evaluate the kinetics and equilibrium binding constants of biomolecules in nanofluidic channels. Binding events in the nanochannel were detected using electrical and fluorescence methods. We concluded that antibody-antigen binding constants in nanochannels …
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Design and Fabrication of Microreactors for High Temperature Applications
Microreactors show promise because of the phenomenon of higher heat and mass transfer rates as the length scale decreases. This thesis describes the fabrication and characterization of SiC and SiCN inverted beaded catalyst supports, which have high chemical and thermal stability (are stable to …
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Additive manufacturing of triply periodic minimal surface informed load bearing stiffness matched tibial bone scaffold
… Periodic Minimal Surface (TPMS) structures to create bone implants that effectively match the mechanical properties of the tibia. The primary goal is to design and fabricate titanium (Ti6Al4V) scaffolds that provide optimal load-bearing capacity while closely matching the stiffness of the …
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An experimental study of nanobubbles on hydrophobic surfaces
… however, are characterized by a large surface area-to-volume ratio so that surface properties strongly affect flow resistance in sub-micrometer devices. Recent studies in the literature have opened up the possibility of a controlled realization of nanobubbles- found to exist primarily on …
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Composite cathodes for lithium rechargeable batteries
… of self-organizing copolymers was investigated towards the fabrication of composite, nanoarchitectured electrode materials for solid-state rechargeable batteries. In situ growth of cathodic phases within ion-conducting copolymer domains was explored as a means to control morphology and to …
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Evaluation of methods to account for release from nanofiber scaffolds
Electrospinning is a common technique utilized to form fibers from the micro- to nanometer range. Nanofibers form through electrospinning can be utilized as scaffolds since the fiber structures are similar to the structures within the extracellular matrix. Researchers use additives, such as growth …
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Capillary-driven shape evolution in solid-state micro- and nano-scale systems
… nano-scale devices. However, their high surface-area-to-volume ratio makes them unstable due to excess surface free energy. Capillarity drives a process known as dewetting, during which holes form, the film edges retract, and a thickened rim of material accumulates at the edges. Various shape …
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MORPHO-PHYSIOLOGICAL EVALUATIONS OF ALEPPO AND BRUTIA PINE SEEDLINGS UNDER TWO DIFFERENT MOISTURE REGIMES (SYRIA, AFFORESTATION, CHLOROPLASTS).
… brutia) was investigated. Both species showed anatomical and morphological adaptations to conserve moisture. Aleppo pine had a thicker cuticle, fewer stomata per unit length, per unit area, and per needle than Brutia pine. A significant number of Aleppo pine stomata were sealed with a waxy layer. …
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