Chemical Thermodynamics
Mostrando 1-12 de 59 artigos, teses e dissertações.
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1. Unified comprehension of the kinetics of isothermal ceramic processes under field-free and resonant wave-field conditions
Abstract This paper proposes a unified comprehension of the isothermal ceramic process kinetics stemming from mesoscopic irreversible thermodynamics. Accordingly, a unified process kinetic equation (UPKE) is derived, which predicts that the global isothermal process rate of any ceramic process is, in general, nonlinearly related both to its activation energy
Cerâmica. Publicado em: 2021-03
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2. UMA AULA DE WALTHER NERNST NO BRASIL
Walther Hermann Nernst is known to have established the basis for the third law of thermodynamics and also as one of the founders of the modern physical chemistry. For his work in chemical thermodynamics, he was awarded the Nobel Prize in chemistry, in 1920. An important fact about this scientist life, not always realized, was his stay in Brazil, in 1914, fo
Quím. Nova. Publicado em: 02/05/2019
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3. Characterization of mineral wools obtained from ornamental rock wastes
Abstract The study aimed to characterize the mineral wools obtained from wastes of the cutting step of marble and granite, in order to evaluate the possibility of their use on an industrial scale. Mixtures of marble and/or granite wastes were prepared in order to reach the chemical composition of rock and glass wools. The batches were melted in an electric a
REM, Int. Eng. J.. Publicado em: 2018-07
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4. SOLVENT SELECTION FOR CHEMICAL REACTIONS: AUTOMATED COMPUTATIONAL SCREENING OF SOLVENTS USING THE SMD MODEL
Finding the most efficient solvent for a chemical reaction can demand costly experimental procedure and the screening is usually limited to few solvents. The use of theoretical methods could accelerate the search for the best solvent, able to promote most effective kinetics and thermodynamics of a reaction. In this work, it was proposed an automated procedur
Quím. Nova. Publicado em: 2018-06
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5. Advances in enzyme bioelectrochemistry
ABSTRACT Bioelectrochemistry can be defined as a branch of Chemical Science concerned with electron-proton transfer and transport involving biomolecules, as well as electrode reactions of redox enzymes. The bioelectrochemical reactions and system have direct impact in biotechnological development, in medical devices designing, in the behavior of DNA-protein
An. Acad. Bras. Ciênc.. Publicado em: 2018
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6. Physical and chemical quality, biodiversity, and thermodynamic prediction of adhesion of bacterial isolates from a water purification system: a case study
ABSTRACT The objective of this study was to evaluate the quality of water purification system and identify the bacteria this system, predict bacterial adherence according to the hydrophobicity of these microorganisms and of the polypropylene distribution loop for purified water. The assessment of drinking water that supplies the purification system allowed g
Braz. J. Pharm. Sci.. Publicado em: 22/06/2017
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7. Efectos de la aplicación de tratamientos isotérmicos sobre el tamaño de grano y la dureza de aleaciones de aluminio AA5083-H116
ABSTRACT In this work is studied the relationship between morphological characteristics of grain and hardness of aluminum alloys AA5083-H116, which has been submitted to several isothermal treatments. For analysis development were used optical and scanning electron microscopy, chemical microanalysis, hardness measurements, differential scanning calorimetry (
Matéria (Rio J.). Publicado em: 02/05/2017
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8. Padrões de Turing em sistemas químicos
Spontaneous pattern formation in reaction-diffusion systems was theoretically proposed by Alan M. Turing in 1952. His breakthrough conceptions of chemical self-organization were able to explain how patterns emerge in nature and the symmetry breaking, which are of utmost importance, for instance, in the context of origin of life. Along with the experimental o
Quím. Nova. Publicado em: 2016-05
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9. CÉLULAS SOLARES SENSIBILIZADAS POR CORANTES NATURAIS: UM EXPERIMENTO INTRODUTÓRIO SOBRE ENERGIA RENOVÁVEL PARA ALUNOS DE GRADUAÇÃO
An interesting practical experiment about the preparation of dye–sensitized solar cells (DSSC) using natural dyes were carried out by the undergraduate students in the chemistry course at UNICAMP . Natural dyes were extracted from blueberries (Vaccinium myrtillus L.), jabuticabas (Myrciaria cauliflora), raw and cooked beets (Beta vulgaris L.), and annattos
Quím. Nova. Publicado em: 2015-12
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10. "Serpentes de Faraó": a história de uma brincadeira pirotécnica e sua aplicabilidade no ensino de princípios químicos básicos
Fun methodologies developed with alternative materials for teaching chemical reactions of carbon are interesting activities for discussing concepts of stoichiometry and thermochemistry. The decomposition of organic matter, CO2 production and coal formation can be demonstrated in the experiment "Pharaoh´s snake". This experiment is attractive since the simpl
Quím. Nova. Publicado em: 2014
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11. Un método para enseñar el porqué suceden las reacciones químicas
A methodology is proposed for explaining one of the central questions in the teaching of general chemistry courses to freshman students: why do chemical transformations occur? The answer to this question is based on thermodynamics but we propose arriving at an answer in a more intuitive way by using computational tools in a bid to increase the motivation of
Quím. Nova. Publicado em: 2013
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12. Estudo de reações químicas homogêneas via método de Monte Carlo
By using the Monte Carlo simulation platform with probabilistic mathematical functions of the Boltzmann type, , having activation energy and temperature as parameters, it was possible to assess important dynamic aspects of homogeneous chemical reactions of the types A → B and A Quím. Nova. Publicado em: 2013