Thesis (Ph. D.)--Columbia University, 1924. / Vita. Description based on print version record. Bibliography: p. 26.

Thesis (Ph. D.)--Columbia University. / Vita. Bibliography: p. 21.

Thesis (Ph. D.)--Columbia University, 1925. / Vita. Description based on print version record. Bibliography: p. [25].

Thesis (Ph. D.)--University of Wisconsin--Madison, 1971. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph.D.)--Kent State University, 2006. / Title from PDF t.p. (viewed Sept. 19, 2006). Advisor: John L. West. Keywords: nematic isotropic interface, liquid crystal colloids, dielectrophoresis, microparticle, drag effect, Raman mapping, IR imaging. Includes bibliographical references (p. 152-164).

Thesis (Ph. D.)--Florida State University, 2006. / Advisor: Wei-Chun Chin, Florida State University, College of Engineering, Dept. of Chemical and Biomedical Engineering. Title and description from dissertation home page (viewed July 5, 2006). Document formatted into pages; contains xiii, 118 pages. Includes bibliographical references.

Thesis (Ph. D.)--University of Washington, 2005. / Vita. Includes bibliographical references (p. 99-104).

Resumo: Amostras comerciais de alumina foram caracterizadas quanto à estrutura, características de superfície e morfologia. Sais de polifosfato com diferentes tamanhos de cadeia foram isolados por cromatografia por troca iônica, tendo como precursor polifosfato de sódio. Os sais isolados na forma de tetraetilamoniomagnésio foram caracterizados e uma das amostras foi ensaiada como agente dispersante para alumina. As técnicas de caracterização utilizadas foram: análise termogravimétrica e térmica diferencial, difratometria de raios X, espectroscopia vibracional infravermelho, microscopia eletrônica de varredura e de transmissão, medidas de mobilidade eletroforética, área de superfície, ressonância magnética nuclear de 31P no estado sólido e sedimentometria. Sedimentometria de partículas de alumina foi utilizada para verificar a influência da natureza e da concentração de sais de polifosfato como agente dispersante na estabilidade coloidal da dispersão. Também foi investigada a influência da forma da partícula na velocidade terminal de sedimentação de partículas micrométricas, através da relação entre o coeficiente de arraste e o número de Reynolds. Modelos estatísticos, a saber: normal, lognormal e Rosin-Rammler foram ajustados aos perfis de sedimentação facilitando o tratamento dos resultados experimentais e permitindo caracterizar as dispersões através de parâmetros dos modelos teóricos, tais como o desvio padrão, que fornece informações sobre a distribuição do tamanho de partículas com relação à media. Metodologia que permitem a linearização dos dados experimentais através dos modelos estatísticos foram empregados e parece contribuir para definir rapidamente faixas de concentração, cada vez mais restritas, até a concentração ideal, bem como a natureza do agente dispersante que minimize a formação de agregados. Os resultados...(Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The influence of the nature and concentration of the polyphosphate salts as dispersant agents on the colloidal stability of alumina dispersions by particle gravitational sedimentation was investigated. Shape of colloidal particle influence on the terminal velocity of sedimentation has been correlated using a simple relationship involving the usual drag coefficient and Reynolds number. In order to treat the experimental results, statistic models: normal, lognormal and Rosin-Rammler were adjusted to the sedimentation curves. Theoretical parameters of these models, such as standard-deviation, gives information about the dispersion of the particle size distribution in relationship to average particle size, and are not usually obtained directly from the experimental data set.A linear data set starting from the experimental data by calculation of the statistical models probabilities was obtained. This procedure quickly define dispersion agent concentration range, more and more restricted, up to the ideal concentration, as well as the nature of the dispersant agent that minimizes the aggregates formation. Structure, surface properties and morphology of the commercial alumina samples were characterized.Ion exchange chromatography for separating polyphosphate salts with different chain size was used.The isolated salts as tetraetylammonium magnesium were characterized and tested as dispersion agent for alumina. However, the salt behaved as flocculant agent due to the group of tetraetylammnium.The samples were characterized by thermogravimetry and diferential thermal analysis, X ray diffratometry, infrared spectroscopy, scanning and transmission electron microscopy, electrophoretic mobility and surface area measurements, 31P MAS NMR and sedimentometry.The results showed that the particle shape influences the settling velocity and they allowed to insert a proportionality term in the Stokes' equation.This term includes the projected area of the particle. / Orientador: Miguel Jafelicci Junior / Coorientador: Romeu Magnani / Banca: José Renato Coury / Banca: Nilso Barelli / Mestre

The presence of 0.1-0.2 moles of free N-terminal groups per 100.000 g. of soluble collagen was demonstrated, and it was proposed that this arises as a result of either tissue catabolism or an incomplete asking of N-terminal residues. Liberation of carbohydrate from collagen by the action of alpha-amylase, without a concomitant release of significant amounts of extra N-terminal residues, precluded the involvement of bexose as a masking factor for alpha-amino groups; although linkage of carbohydrate to E amino groups or histidine residues, is still a possibility. All of the E lysyl amino groups of collagen were demonstrated to be effectively free for substitution by the reagent 1 Fluoro 2:4 dinitrobenzene, with the reservation that one or two residues way be covalently bonded at the E amino group and so not available to F.D.H.B. The presence of free lysine in hydrolyses of D.N.P. peptides obtained by collagenase digestion of collagen, and subsequent dinitrophenyletion, was shown to be probably due to this. As more free lysine was found in analyses of material from insoluble collagen than of material from soluble collagen, it was concluded that the free lysine probably has been involved mainly in intermolecular crosslinking. Further evidence for covalently linked E-lysyl groups came from investigations on polar peptides obtained by electrophoretic separation of the collagenase-liberated peptides. It was suggested that these linkages may be involved in intermolecular crosslinking, but were not involved in intermolecular crosslinking of the type proposed by Bornstein et. al. (1965).

Made available in DSpace on 2014-06-11T19:25:35Z (GMT). No. of bitstreams: 0 Previous issue date: 1999-05-17Bitstream added on 2014-06-13T19:12:30Z : No. of bitstreams: 1 varanda_lc_me_araiq.pdf: 4063066 bytes, checksum: 6543acba4b206125bc43665f5db92ef2 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Amostras comerciais de alumina foram caracterizadas quanto à estrutura, características de superfície e morfologia. Sais de polifosfato com diferentes tamanhos de cadeia foram isolados por cromatografia por troca iônica, tendo como precursor polifosfato de sódio. Os sais isolados na forma de tetraetilamoniomagnésio foram caracterizados e uma das amostras foi ensaiada como agente dispersante para alumina. As técnicas de caracterização utilizadas foram: análise termogravimétrica e térmica diferencial, difratometria de raios X, espectroscopia vibracional infravermelho, microscopia eletrônica de varredura e de transmissão, medidas de mobilidade eletroforética, área de superfície, ressonância magnética nuclear de 31P no estado sólido e sedimentometria. Sedimentometria de partículas de alumina foi utilizada para verificar a influência da natureza e da concentração de sais de polifosfato como agente dispersante na estabilidade coloidal da dispersão. Também foi investigada a influência da forma da partícula na velocidade terminal de sedimentação de partículas micrométricas, através da relação entre o coeficiente de arraste e o número de Reynolds. Modelos estatísticos, a saber: normal, lognormal e Rosin-Rammler foram ajustados aos perfis de sedimentação facilitando o tratamento dos resultados experimentais e permitindo caracterizar as dispersões através de parâmetros dos modelos teóricos, tais como o desvio padrão, que fornece informações sobre a distribuição do tamanho de partículas com relação à media. Metodologia que permitem a linearização dos dados experimentais através dos modelos estatísticos foram empregados e parece contribuir para definir rapidamente faixas de concentração, cada vez mais restritas, até a concentração ideal, bem como a natureza do agente dispersante que minimize a formação de agregados. Os resultados... / The influence of the nature and concentration of the polyphosphate salts as dispersant agents on the colloidal stability of alumina dispersions by particle gravitational sedimentation was investigated. Shape of colloidal particle influence on the terminal velocity of sedimentation has been correlated using a simple relationship involving the usual drag coefficient and Reynolds number. In order to treat the experimental results, statistic models: normal, lognormal and Rosin-Rammler were adjusted to the sedimentation curves. Theoretical parameters of these models, such as standard-deviation, gives information about the dispersion of the particle size distribution in relationship to average particle size, and are not usually obtained directly from the experimental data set.A linear data set starting from the experimental data by calculation of the statistical models probabilities was obtained. This procedure quickly define dispersion agent concentration range, more and more restricted, up to the ideal concentration, as well as the nature of the dispersant agent that minimizes the aggregates formation. Structure, surface properties and morphology of the commercial alumina samples were characterized.Ion exchange chromatography for separating polyphosphate salts with different chain size was used.The isolated salts as tetraetylammonium magnesium were characterized and tested as dispersion agent for alumina. However, the salt behaved as flocculant agent due to the group of tetraetylammnium.The samples were characterized by thermogravimetry and diferential thermal analysis, X ray diffratometry, infrared spectroscopy, scanning and transmission electron microscopy, electrophoretic mobility and surface area measurements, 31P MAS NMR and sedimentometry.The results showed that the particle shape influences the settling velocity and they allowed to insert a proportionality term in the Stokes’ equation.This term includes the projected area of the particle.