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Articles 1 - 9 of 9
Full-Text Articles in Engineering
Role Of Strongly Interacting Additives In Tuning The Structure And Properties Of Polymer Systems, Vikram Kumar Daga
Role Of Strongly Interacting Additives In Tuning The Structure And Properties Of Polymer Systems, Vikram Kumar Daga
Open Access Dissertations
Block copolymer (BCP) nanocomposites are an important class of hybrid materials in which the BCP guides the spatial location and the periodic assembly of the additives. High loadings of well-dispersed nanofillers are generally important for many applications including mechanical reinforcing of polymers. In particular the composites shown in this work might find use as etch masks in nanolithography, or for enabling various phase selective reactions for new materials development. This work explores the use of hydrogen bonding interactions between various additives (such as homopolymers and non-polymeric additives) and small, disordered BCPs to cause the formation of well-ordered morphologies with small …
Modeling And Simulation Of Nanoparticle Formation In Microemulsion Droplets, Sreekumar R. Kuriyedath
Modeling And Simulation Of Nanoparticle Formation In Microemulsion Droplets, Sreekumar R. Kuriyedath
Open Access Dissertations
Semiconductor nanocrystals, also known as quantum dots (QDs), are an important class of materials that are being extensively studied for a wide variety of potential applications, such as medical diagnostics, photovoltaics, and solid-state lighting. The optical and electronic properties of these nanocrystals are different from their bulk properties and depend on the size of the QDs. Therefore an important requirement in their synthesis is a proper control on the final nanoparticle size. Recently, a technique has been developed for synthesizing zinc selenide (ZnSe) QDs using microemulsion droplets as templates. In these systems, a fixed amount of a reactant is dissolved …
Separation Of Carboxylic Acids From Aqueous Fraction Of Fast Pyrolysis Bio-Oils Using Nanofiltration And Reverse Osmosis Membranes, Achyuta Vara Prasada Rao Teella
Separation Of Carboxylic Acids From Aqueous Fraction Of Fast Pyrolysis Bio-Oils Using Nanofiltration And Reverse Osmosis Membranes, Achyuta Vara Prasada Rao Teella
Open Access Dissertations
There has been a growing interest in renewable sources of energy due to an increase in demand and potential shortages and environmental problems associated with fossil fuels. Bio-oils, complex liquid fuels produced from fast pyrolysis of biomass, have been recognized as one potential source of renewable energy. However, they cannot be utilized directly due to their high viscosity, corrosiveness, and high char content. Bio-oils readily phase separate into aqueous phase and organic phase upon addition of water. The aqueous fraction of bio oil (AFBO) is convenient to process and contains sugars, organic acids, hydroxyacetone, hydroxyacetaldehyde, furfural, phenols and other organic …
Development Of Plant Cell Culture Processes To Produce Natural Product Pharmaceuticals: Characterization, Analysis, And Modeling Of Plant Cell Aggregation, Martin Kolewe
Open Access Dissertations
Plant derived natural products represent some of the most effective anti-cancer and anti-infectious disease pharmaceuticals available today. However, uncertainty regarding the feasibility of commercial supply due to the limited availability of many plants in nature has resulted in a dramatic reduction in the use of natural products as leads in modern drug discovery. Plant cell suspension culture, consisting of dedifferentiated plant cells grown in vitro and amenable to large scale industrial biotechnology processes, is a production alternative which promises renewable and economical supply of these important drugs. The widespread application of this technology is limited by low product yields, slow …
Flow Cytometry Of Cultured Plant Cells For Characterization Of Culture Heterogeneity And Cell Sorting Applications, Vishal Gaurav
Flow Cytometry Of Cultured Plant Cells For Characterization Of Culture Heterogeneity And Cell Sorting Applications, Vishal Gaurav
Open Access Dissertations
Plant cells culture provides a production source for plant-derived pharmaceuticals in which environmental conditions can be more easily controlled, manipulated, and optimized to yield high quantities of these valuable natural products. The Roberts Laboratory focuses on development and optimization of bio-processes for production of the anti-cancer agent paclitaxel (Taxol®) in Taxus cell suspension cultures with an emphasis on understanding cellular metabolism at both the molecular and cellular level. Most studies concerning metabolite production via cell culture technology rely on culture-average parameters, which are often insufficient to describe culture heterogeneity. There are several limitations associated with this non-model system; and adapting …
Computational Analysis Of Structural Transformations In Carbon Nanostructures Induced By Hydrogenation, Andre R. Muniz
Computational Analysis Of Structural Transformations In Carbon Nanostructures Induced By Hydrogenation, Andre R. Muniz
Open Access Dissertations
Carbon nanomaterials, such as carbon nanotubes and graphene, have attracted significant interest over the past several years due to their outstanding and unusual combination of physical properties. These properties can be modified in a controllable way by chemical functionalization in order to enable specific technological applications. One example is hydrogenation, achieved by the exposure of these materials to a source of atomic hydrogen. This process has been considered for hydrogen storage purposes and for the control of the band gap of these materials for applications in carbon-based electronics. Hydrogen atoms are chemisorbed onto the surface of these materials, introducing sp3-hybridized …
Atomic-Scale Modeling Of Transition-Metal Doping Of Semiconductor Nanocrystals, Tejinder Singh
Atomic-Scale Modeling Of Transition-Metal Doping Of Semiconductor Nanocrystals, Tejinder Singh
Open Access Dissertations
Doping in bulk semiconductors (e.g., n- or p- type doping in silicon) allows for precise control of their properties and forms the basis for the development of electronic and photovoltaic devices. Recently, there have been reports on the successful synthesis of doped semiconductor nanocrystals (or quantum dots) for potential applications in solar cells and spintronics. For example, nanocrystals of ZnSe (with zinc-blende lattice structure) and CdSe and ZnO (with wurtzite lattice structure) have been doped successfully with transition-metal (TM) elements (Mn, Co, or Ni). Despite the recent progress, however, the underlying mechanisms of doping in colloidal nanocrystals are not well …
Pyrolysis Oils: Characterization, Stability Analysis, And Catalytic Upgrading To Fuels And Chemicals, Tushar Vispute
Pyrolysis Oils: Characterization, Stability Analysis, And Catalytic Upgrading To Fuels And Chemicals, Tushar Vispute
Open Access Dissertations
There is a growing need to develop the processes to produce renewable fuels and chemicals due to the economical, political, and environmental concerns associated with the fossil fuels. One of the most promising methods for a small scale conversion of biomass into liquid fuels is fast pyrolysis. The liquid product obtained from the fast pyrolysis of biomass is called pyrolysis oil or bio-oil. It is a complex mixture of more than 300 compounds resulting from the depolymerization of biomass building blocks, cellulose; hemi-cellulose; and lignin. Bio-oils have low heating value, high moisture content, are acidic, contain solid char particles, are …
Mechanical Evaluation Methods For Polymer And Composite Systems, Donna Theresa Wrublewski
Mechanical Evaluation Methods For Polymer And Composite Systems, Donna Theresa Wrublewski
Open Access Dissertations
This dissertation describes the development and application of various mechanical characterization techniques to four types of polymer composite materials. The composite nature of these materials ranges from molecular to macro-scale, as do the size scales probed by the techniques chosen. The two main goals of this work are to evaluate the suitability of existing characterization methods to new composite materials (and augment the methods as needed), and to use these methods to determine optimal composite system parameters to maximize the desired mechanical response. Chapter 2 employs nondestructive ultrasonic spectroscopy for characterizing the stiffness response of both micron-scale woven composites and …