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 84 for “"Massachusetts Institute of Technology. Chemical Engineering."”.
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The kinetics of the reaction of carbon with carbon dioxide
Thesis (Sc.D.)--Massachusetts Institute of Technology. Dept. of Chemical Engineering, 1950.
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Microbioreactors for bioprocess development
… the design, fabrication, and characterization of a microbioreactor integrated with automated sensors and actuators as a step towards high-throughput bioprocess development. In particular, this thesis demonstrates the feasibility of culturing microbial cells in microliter-volume reactors in …
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Initiated chemical vapor deposition of polymeric thin films : mechanism and applications
Initiated chemical vapor deposition (iCVD) is a novel technique for depositing polymeric thin films. It is able to deposit thin films of application-specific polymers in one step without using any solvents. Its uniqueness of in situ surface polymer synthesis distinguishes iCVD from conventional …
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Controlled synthesis and characterization of templated, magneto-responsive nanoparticle structures
Magnetic fluids are colloidal dispersions of magnetic nanoparticles that are stable with respect to gravitational and moderate magnetic fields because of their small particle size, and to unbounded aggregation due to their surface coatings. The interaction between individual magnetic nanoparticles …
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Theoretical and experimental investigation of particle interactions in pharmaceutical powder blending
… pharmaceutical manufacturing practices, blending of active pharmaceutical ingredient (API) with excipients is a crucial step in that homogeneity of active ingredient after blending is a key issue for the quality assurance of final products. Inadequate knowledge of the interdependence between raw …
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Magnetic gels for uranium recovery from wet phosphoric acid
Incorporation of uranium recovery into wet phosphoric acid (WPA) processes can potentially supplement a significant portion of the world's uranium production and simultaneously benefit human health and environment by reducing radiological and toxic contamination of the phosphate fertilizer …
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Molecular modeling of hydrate-clathrates via ab initio, cell potential, and dynamic methods
… methane-argon hydrate systems. A consistent set of reference parameters for the van der Waals and Platteeuw model, ... and ..., were developed for Structure II hydrates and are not dependent on any fitted parameters. Our previous methane-water ab initio energy surface has been recast onto a …
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Etching kinetics and surface roughening of polysilicon and dielectric materials in inductively coupled plasma beams
Plasma etching processes often roughen the feature sidewalls forming anisotropic striations. A clear understanding of the origin and control of sidewall roughening is extremely desirable, particularly at the gate level where variations in line width can adversely impact the electrical performance …
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Multiple particle tracking to assess the microstructure of biological fluids
Tracking the Brownian motion of colloids was first used about a hundred years ago to demonstrate the molecular nature of matter. Today's colloidal scientists perform particle tracking experiments to assess the structural and mechanical properties of complex materials at a micron length scale. …
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Electrospinning of polymeric nanofiber materials : process characterization and unique applications
… and lies down on a collector in the form of a non-woven fiber mat. Electrospinning has attracted much attention recently due to the ease with which fine fibers about 10 nanometers to 10 microns in diameter can be produced from both natural and synthetic polymers. Despite the large volume …
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Selection and optimization of gene targets for the metabolic engineering of E. coli
… interventions that improve the performance of targeted pathways in the metabolism of the bacterium Escherichia coli. Three case studies illustrate three disparate approaches to identifying genetic interventions: (i) combining metabolomic measurements with thermodynamic calculations to …
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Hydrothermal processing of high-lipid biomass to fuels
High-lipid algae are potential sources of biofuels. Lipids in this biomass provide a straightforward chemical route to hydrocarbon-based high energy-density fuels needed for diesel and jet engines. However, current schemes for producing these biofuels require large amounts of energy and solvents to …
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Analysis of complex viscoelastic flows using a finite element method
The field of computational fluid mechanics of viscoelastic flows has been well explored in the three decades since its inception. Still, even with the vast amount of work detailed in the literature, much remains to be done towards the improvement of models of viscoelastic fluids and the improvement …
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Mechanistic studies on chemical instabilities of recombinant proteins
… from diabetes and haemophilia to various types of cancers due to their great potency and specificity. However, these macromolecules are intrinsically unstable in aqueous solutions, due to the existence of various physical and chemical degradation pathways. Degraded protein molecules have much …
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Spatial and temporal control of lipid-membrane morphology induced by sphingomyelinase
… has been shown to be involved in a variety of cell regulation processes. It can convert sphingomyelin (SM) to ceramide (Cer) and has been suggested to influence the cellular processes by reorganizing the cell membrane morphology. This thesis aims at a more comprehensive understanding of how …
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Magnetically enhanced centrifugation for continuous biopharmaceutical processing
Effective separation and purification of biopharmaceutical products from the media in which they are produced continues to be a challenging task. Such processes usually involve multiple steps and the overall product loss can be significant. As an integrative technique, high gradient magnetic …
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Improving thermodynamic property estimation through volume translation
… state process simulation is used throughout the chemical industry to guide development and help reduce uncertainty and risk. Volumetric equations of state (EOS)s are the most robust of the numerous methods available for estimating various thermodynamic properties of interest because they are …
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Next generation of electrospun textiles for chemical and biological protection and air filtration
(cont.) only in the presence of water, which serves as a medium promoting the nucleophilic action of the amidoximes in the fibers. Bactericidal fiber mats were produced from electrospinning of blends containing a biocide chlorhexidine (CHX). A small amount of high molecular weight poly(ethylene …
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Biological applications of weal polyelectrolyte multilayers
… research focused on biological applications of ultra-thin weak polyelectrolyte multilayers with specific emphasis on cell patterning, drug delivery, and antibacterial coatings. All of these very different applications were studied using three different polymers - polyacrylic acid (PAA), …
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Predictive modeling of combustion processes
… this process a more fundamental understanding of chemistry and physical processes is required. The fundamental constants like rate coefficients of elementary reactions are readily transferable enabling us to use results from one set of experiments or calculations in a different situation. In …
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