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Bubble growth behavior in supersaturated liquid solutions /Cyr, David Robert, Thompson, Edward V. Amar, Francois G. Bousfield, Douglas W. Pendse, Hemant P. Unertl, W. N. January 2001 (has links)
Thesis (Ph. D.) in Chemical Engineering--University of Maine, 2001. / Includes vita. Advisory Committee: Edward V. Thompson, Prof. of Chemical Engineering, Advisor; Francois G. Amar, Prof. of Chemistry; Douglas W. Bousfield, Prof. of Chemical Engineering; Hemant P. Pendse, Prof. of Chemical Engineering; William N. Unertl, Prof. of Physics. Includes bibliographical references (leaves 121-126).
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The measurement of diffusion coefficients in supersaturated solutionsSorell, Louis Steven 05 1900 (has links)
No description available.
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Solubility and recovery of L-isoleucine from high pH solutions and the cause for L-serine habit differences when crystallized from water and methanol/water solutionsGatewood, Marena Dessette 05 1900 (has links)
No description available.
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Concentration dependent diffusion of solid-solute, liquid-solvent systems in the supersautrated regionChang, Yun Chea 05 1900 (has links)
No description available.
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The supersaturation of gases in water and certain organic liquidsMetschl, John. January 1923 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1923. / Cover title. Reprinted from the Journal of physical chemistry, v. 28, May, 1924. eContent provider-neutral record in process. Description based on print version record.
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Highly supersaturated aqueous solutions by design of amorphous pharmaceutical nanoparticlesMatteucci, Michal Elizabeth, 1977- 18 June 2012 (has links)
For 40% of currently discovered drugs which are poorly water soluble, engineering amorphous nanoparticles with rapid dissolution and enhanced solubility can improve their absorption. Antisolvent precipitation by mixing organic drug solutions with aqueous solutions produced sub-300 nm amorphous nanoparticle dispersions. Polymeric stabilizers increased the nucleation rate by lowering the interfacial tension and adsorbed to particle surfaces to inhibit growth by condensation and coagulation. An increase in the stabilizer concentration decreased the average particle size until reaching a threshold where the particles were < 300 nm for the poorly water soluble drug, itraconazole. The amorphous itraconazole nanoparticle dispersions dissolved at pH 1.2 to produce high supersaturation levels up to 90-times the equilibrium solubility. The supersaturation increased with particle curvature, as described qualitatively by the Kelvin equation. A thermodynamic analysis indicated the stabilizer maintained amorphous ITZ in the solid phase with a fugacity 90-times the crystalline value, while it did not influence the activity coefficient of ITZ in the aqueous phase. Recovery of the amorphous nanoparticles from water was achieved by adding salt to desolvate the polymeric stabilizers and flocculate the particles, which could then be rapidly filtered. The flocculation under constant particle volume fraction produced open flocs which were redispersible in water to their original ~300 nm size, after filtration and drying. Amorphous particles were preserved, as flocs were formed below the drug's glass transition temperature. After flocculation/filtration, medium surface area (2-5 m²/g) particles dissolved rapidly in pH 6.8 buffer with 0.17% surfactant to an unusually large supersaturation up to 17, comparable to that for high surface area (13-36 m²/g) particles. However, the decay in supersaturation was much slower for the medium surface area particles, as the smaller excess surface area of undissolved particles produced slower nucleation and growth from solution. In contrast, the maximum supersaturation was far lower for more conventional low surface area solid dispersions of drug in polymers, because of crystallization of undissolved solid during slow dissolution. The ability to design the particle morphology to manipulate the level in supersaturation in pH 6.8 media, offers new opportunities in raising bioavailability in gastrointestinal delivery. / text
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Evolution of Vacancy Supersaturations in MeV Si Implanted SiliconVenezia, Vincent C. 05 1900 (has links)
High-energy Si implantation into silicon creates a net defect distribution that is characterized by an excess of interstitials near the projected range and a simultaneous excess of vacancies closer to the surface. This defect distribution is due to the spatial separation between the distributions of interstitials and vacancies created by the forward momentum transferred from the implanted ion to the lattice atom. This dissertation investigates the evolution of the near-surface vacancy excess in MeV Si-implanted silicon both during implantation and post-implant annealing. Although previous investigations have identified a vacancy excess in MeV-implanted silicon, the investigations presented in this dissertation are unique in that they are designed to correlate the free-vacancy supersaturation with the vacancies in clusters. Free-vacancy (and interstitial) supersaturations were measured with Sb (B) dopant diffusion markers. Vacancies in clusters were profiled by Au labeling; a new technique based on the observation that Au atoms trap in the presence of open-volume defects. The experiments described in this dissertation are also unique in that they were designed to isolate the deep interstitial excess from interacting with the much shallower vacancy excess during post-implant thermal processing.
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A study of the growth and aggregation of calcium oxalate monohydrate / by Allan Sidney Bramley.Bramley, Allan Sidney January 1994 (has links)
Bibliography: leaves 278-289. / xi, 324 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This thesis reports on experimental investigation of the growth and aggregation of calcium oxalate mono-dydrate in metastable saline solutions using batch and continuous systems. The physical chemistry of calcium oxalate mono-hydrate in aqueous solutions is considered. A tubular crystalliser to be used as an in vitro system is described. / Thesis (Ph.D.)--University of Adelaide, Dept. of Chemical Engineering, 1996?
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Solubility and phase transitions in batch and laminar-flow tubular crystallizersMéndez del Río, José Ricardo. January 2004 (has links) (PDF)
Thesis (M.S.)--Chemical Engineering, Georgia Institute of Technology, 2005. / Ronald W. Rousseau, Committee Chair ; William J. Koros, Committee Member ; Angus P. Wilkinson, Committee Member ; David J. am Ende, Committee Member. Includes bibliographical references.
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Investigation and modeling of the mechanisms involved in batch cooling crystallization and polymorphism through efficient use of the FBRMBarthe, Stephanie Cecile. January 2008 (has links)
Thesis (Ph.D.)--Chemical Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Dr Rousseau, Ronald W; Committee Co-Chair: Dr Grover Gallivan, Martha; Committee Member: Dr Realff, Matthew; Committee Member: Dr Garmestani, Hamid; Committee Member: Dr Nenes, Athanasios.
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