Ionic Dynamics
Mostrando 1-12 de 65 artigos, teses e dissertações.
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1. Relaxational Dynamics in the PYR14-IM14 Ionic Liquid by Mechanical Spectroscopy
The anelastic spectrum of the N-butyl-N-methyl-pyrrolidinium (trifluoromethanesulfonyl) (nonafluorobutanesulfonyl)imide (PYR14-IM14) is reported for the first time. On cooling, at 4 Kmin-1 the sample undergoes a glass transition around 190 K. In the liquid phase, a thermally activated relaxation process is measured and it is analyzed by means of a modified
Mat. Res.. Publicado em: 04/06/2018
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2. CHEMICAL DEMULSIFICATION OF MODEL WATER-IN-OIL EMULSIONS WITH LOW WATER CONTENT BY MEANS OF IONIC LIQUIDS
Abstract The demulsification of model water-in-oil (w/o) emulsions containing 1% wt. water by [Omim][PF6] and Aliquat® 336 ionic liquids (IL) as demulsifiers was investigated in batch mode at different temperatures (30, 45 and 60 °C) and demulsifier concentrations (2.5×10‒3, 1.2×10‒2 and 2.9×10‒2 mol L‒1). The model oil is a mixture n-heptane/to
Braz. J. Chem. Eng.. Publicado em: 2017-01
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3. MOLECULAR VALIDATED MODEL FOR ADSORPTION OF PROTONATED DYE ON LDH
Abstract Hydrotalcite-like compounds are anionic clays of scientific and technological interest for their use as ion exchange materials, catalysts and modified electrodes. Surface phenomenon are important for all these applications. Although conventional analytical methods have enabled progress in understanding the behavior of anionic clays in solution, an e
Braz. J. Chem. Eng.. Publicado em: 2016-03
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4. Modeling Chemical Reactivity in Ionic Detergent Micelles: a Review of Fundamentals
Ionic detergent micelles have the capacity to solubilize organic substrates, interact selectively with counterions, repel coions, exhibit partial "dissociation" of the counterions, grow in size with added salt, affect the position of chemical equilibria, accelerate or inhibit the rates of chemical reactions, modulate photochemical reactivity and determine th
J. Braz. Chem. Soc.. Publicado em: 2016-02
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5. A computer simulation study of motoneuron models with active dendrites in response to synaptic inputs. / Estudo por simulação computacional de modelos de motoneurônios com dendrito ativo em resposta a entradas sinápticas.
Mathematical models of motoneurons have been developed as an aid to the understanding of phenomena involving the neuromuscular system, but most of these models have been based on the hypothesis of a passive dendritic tree. This holds for anesthetized animals but not necessarily during normal motor behavior of the intact animal. Experiments with decerebrate a
Publicado em: 2010
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6. Relações entre nutrientes na fase sólida e solução de um latossolo durante o primeiro ano nos sistemas plantio direto e convencional / Relationship between nutrients in solid phase and soil solution of a “latossolo” (oxisol) in the first year of no-tillage and conventional systems
Somente a análise dos nutrientes da fase sólida pode não representar a disponibilidade de nutrientes porque não considera a sua relação com a solução do solo. Realizouse um trabalho visando a estudar a relação entre nutrientes na fase sólida e na solução de um Latossolo durante o primeiro ano da instalação dos sistemas plantio direto e convenc
Publicado em: 2010
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7. Interaction of SO2 with molecular and ionic species: Raman spectroscopy and theoretical calculations / Interação de SO2 com espécies iônicas e moleculares: espectrocopia raman e cálculos teóricos
In the present work molecular systems bearing the sulfur dioxide (SO2) as an electron acceptor species and several electron donor species as amines (aliphatic and aromatic), inorganic complexes and ionic liquids were investigated. Such complexes are commonly known as donor-acceptor complexes, and in particular, in the case of SO2 complexes are characterized
Publicado em: 2009
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8. MOLECULAR CHARACTERIZATION OF BIOPOLIMERS IN SOLUTION BY COMPUTATIONAL SIMULATION / Caracterização molecular de biopolímeros em solução utilizando simulação computacional
Computer simulation methods were used to characterize the structure and molecular properties of natural and synthetic biopolymers in aqueous solution. The polysaccharides chitin and chitosan, and aliphatic polypeptides were studied. The interest on the chitin and chitosan biopolymers is because of their biodegradability, biocompatibility and potential use as
Publicado em: 2009
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9. Simulação computacional de espectros Raman de líquidos iônicos / Molecular dynamics simulation of Raman spectra of ionic liquids
In this work, theory, experiment and simulation are conjugated to investigate ionic liquids. The observed components in the low frequency part of the spectra (the region between 0 e 200 cm-1) results from the roto-translational dynamics and from inter molecular interactions. In this sense, the vibrational spectroscopies are inserted in the context of techniq
Publicado em: 2008
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10. Dinâmica das formas dissolvidas de nitrogênio e carbono em microbacias da Mata Atlântica no município de Ubatuba (SP) / Dynamics of dissolved forms of nitrogen and carbon in small watersheds of the Atlantic Forest, at Ubatuba - Brazil
Based on the fact that streams water quality reflects the conditions of the landscape, the objectives of this study were: to investigate nitrogen (N), carbon (C) and major ions dynamics in six streams covered by Atlantic Forest; and assess the impacts of the human activities over the biogeochemistry of two urban streams at same region. Since this study is pa
Publicado em: 2008
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11. Development and implantation of an operational setup designed for the evaluation of new tracers for oil reservoir characterization / Desenvolvimento e inplantação de um sistema operacional para a qualificação do desempenho de novos traçadores para reservatórios de petróleo
Petroleum, nowadays, is one of the most important natural resources in the world, since it is one of the main primary sources of energy and also raw material for many different products. It can be found accumulated in the subsoil, and was produced from the remaining portions of animals and vegetables, in a process that took millions of years to be concluded.
Publicado em: 2008
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12. Mecanismo de defesa e recuperação da fotossintese em Centrolobium tomentosum sob condições de estresse induzido por SO2 / Mechanism of defense and recovery of photosynthesis in Centrolobium tomentosum under conditions of stress induced by SO2
Large quantities of gaseous pollutants emited by urban-industrial areas emit contribute to the degradation of ecosystems with subsequent declines in vegetation. The photosynthesis is one of the first processes altered by the action of these pollutants and sulphur dioxide (SO2), as one of the most common and harmful air pollutants, drastically affect the phot
Publicado em: 2008