Chemical Thermodynamics
Mostrando 13-24 de 59 artigos, teses e dissertações.
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13. Estudo do equilíbrio sólido-líquido de sistemas contendo aminoácidos e proteínas. / Study of the solid-liquid equilibrium of systems containing amino acids and proteins.
A modelagem termodinâmica do equilíbrio sólido-líquido de sistemas que contêm aminoácidos e proteínas tem sido cada vez mais necessária para o desenvolvimento de equações que permitam um projeto mais racional e eficiente das operações unitárias encontradas nos processos de purificação destas moléculas, tais como a precipitação e a cristaliz
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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14. Dinâmica natural e ensino de Química para jovens e adultos : saberes e práticas de uma inovação curricular / Natural dynamics and teaching chemistry to adult education : knowledge and practices of curriculum innovation
The curricular innovation was applied and evaluated to understand terrestrial environments in order to teach chemical concepts. Contents were organized to understand a social and environmental problem. The issue was chosen to attract adult students. The houses of people in the city of Cajamar (in the Brazilian state of São Paulo) were destroyed or damaged b
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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15. Condições de equilíbrio termodinâmico: a função disponibilidade
The thermodynamic equilibrium is a state defined by conditions which depend upon some characteristics of the system. It requires thermal, mechanical, chemical and phase equilibrium. Continuum thermodynamics, its radical restriction usually called homogeneous processes thermodynamics, as well as the classical thermodynamic science of reversible processes, eac
Química Nova. Publicado em: 2011
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16. Variación del grado de avance de reacción en sistemas cerrados en equilibrio químico que modifican la temperatura a volumen constante
In this paper it is presented a thermodynamic analysis that aims to find the mathematical expression of the variation of extent of reaction with the infinitesimal variation in the temperature at constant volume of a chemical equilibrium mixture. The goal of this paper is to establish an alternative approach to avoid both the Le Chatelier's principle and the
Química Nova. Publicado em: 2011
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17. Modelo de contribuições de grupos aplicado a reações para a formação do biodiesel
The interest in biofuels has increased substantially in recent years due, mainly, to reduced damage to the environment compared to conventional fuels derived from petroleum. Accordingly, biodiesel has been studied by researchers around the world. The main routes of production of biodiesel are the reactions of esterification of fatty acids and transesterifica
Publicado em: 2010
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18. Caracterização por espalhamento de luz de dispersões aquosas de agregados lipídicos aniônicos / Structural characterization of aqueous dispersions of the anionic phospholipid DMPG by light scattering
Neste trabalho caracterizamos dispersões aquosas de vesículas lipídicas por espalhamento de luz. Utilizamos os diferentes métodos da técnica: espalhamento de luz estático (SLS) e espalhamento de luz dinâmico (DLS) no estudo desses sistemas. No SLS a intensidade da luz espalhada foi coletada em vários ângulos de espalhamento para diferentes concentra
Publicado em: 2010
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19. Dark Energy and The Accelerating Universe: Conceptual Aspects and Observational Tests / Energia escura e aceleração do Universo: Aspectos conceituais e testes observacionais
In the last decade, the extraordinary progress of the astronomical observations (distances with supernovas, matter and cosmic background radiation (CBR) power spectrum, X-ray surface brightness of galaxy clusters, etc) associated with important theoretical developments turned Cosmology one of the most exciting frontiers of contemporary science. In this thesi
Publicado em: 2010
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20. A quantidade de matéria nas ciências clássicas
The chemical amount values vary in a discrete or continuous form, depending on the approach used to describe the system. In classical sciences, the chemical amount is a property of the macroscopic system and, like any other property of the system, it varies continuously. This is neither inconsistent with the concept of indivisible particles forming the syste
Química Nova. Publicado em: 2009
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21. Synthesis and characterization of hybrid silica / chitosan: a study of the interaction with anionic dye / Síntese e caracterização do híbrido sílica/quitosana: estudo da interação com corante aniônico
Organic and inorganic materials have been used as adsorbent materials of aquatic pollutants due to their both good adsorption capacities and physical and chemical stabilities. In this work, the ligand 3-aminopropytrimethoxysilane was immobilized on silica gel surface, with consecutive reactions with glutaraldehyde and chitosan. All materials were characteriz
Publicado em: 2009
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22. Synthesis and characterization of hybrid silica / chitosan: a study of the interaction with anionic dye / Síntese e caracterização do híbrido sílica/quitosana: estudo da interação com corante aniônico
Matrizes orgânicas e inorgânicas têm sido utilizadas como materiais para remoção de poluentes aquáticos, dada às suas boas capacidades de adsorção e estabilidades físicas e químicas. Neste trabalho, foi sintetizado e caracterizado o material híbrido orgânico/inorgânico Sílica/Quitosana Reticulado (Sil-Quit-R) através da formação de ligaçõ
Publicado em: 2009
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23. Diagramas de Ellingham e de Van't Hoff: algumas considerações
The main subject of this article is to show the parallelism betwen the Ellingham and Van't Hoff diagrams. The first one is a graphic representation of the changes in the standard Gibbs free energy (deltarGtheta) as a function of T and was introduced by Ellingham in 1944, in order to study metallurgic processes involving oxides and sulphides. On the other han
Química Nova. Publicado em: 2007-04
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24. Evaluation of the dioxin and furan formation thermodynamics in combustion processes of urban solid wastes
Specific combustion programs (Gaseq, Chemical equilibria in perfect gases, Chris Morley) are used to model dioxin and formation in the incineration processes of urban solid wastes. Thanks to these programs, it is possible to establish correlations with the formation mechanisms postulated in literature on the subject. It was found that minimum oxygen quantiti
Eclética Química. Publicado em: 2007