Chloride Diffusion
Mostrando 13-24 de 123 artigos, teses e dissertações.
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13. Chloride diffusivity in red mud-ordinary portland cement concrete determined by migration tests
Red mud, which is a solid waste produced in the alumina production process, is classified as dangerous due to its high pH. In this work, the concentration of chlorides was monitored by measuring the conductivity of the anolyte, which initially was distilled water. The steady and nonsteady-state chloride diffusion coefficients were estimated from the "time la
Mat. Res.. Publicado em: 06/05/2011
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14. Salting kinetics and salt diffusivities in farmed Pantanal caiman muscle.
The legal Pantanal caiman (Caiman crocodilus yacare) farming, in Brazil, has been stimulated and among meat preservation techniques the salting process is a relatively simple and low-cost method. The objective of this work was to study the sodium chloride diffusion kinetics in farmed caiman muscle during salting. Limited volumes of brine were employed, with
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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15. SÍNTESE E CARACTERIZAÇÃO DE HÍBRIDOS À BASE DE ALGINATO DE SÓDIO E ESCAMAS DE PEIXE PARA USO NA REMOÇÃO DE ESPÉCIES POLUENTES / SYNTHESIS AND CHARACTERIZATION OF HYBRIDS BASED SODIUM ALGINATE AND FISH SCALES FOR USE IN REMOVAL OF POLLUTANT SPECIES
With the purpose to develop environmentally appropriate materials, scales of the Piau fish and sodium alginate were used as precursor materials for the preparation of new ecomaterials which were used in the removal of the herbicide Paraquat and ions Co(II) and Cu(II). The hybrid material obtained from the reaction between the polysaccharide and scales was de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2010
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16. Cell toxicity in vitro analysis of PVC tubes consecutively submitted to gamma-rays and ethylene oxide sterilization / Análise in vitro da toxicidade celular de tubos de PVC esterilizados consecutivamente em raios gama e óxido de etileno
In 1967, a letter sent to the British Medical Journal reported that the re-sterilization with Ethylene Oxide (EtO) of previously irradiated Polyvinyl Chloride (PVC) formed large amounts of ethylene chlorohydrin, a highly toxic compound. Even though it did not present measured data, this letter initiated a controversy that still divide the opinion of research
Publicado em: 2010
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17. Avaliação das propriedades de transporte de massa contendo adições minerais / Evaluation of the mass transport containing mineral admixtures
A durabilidade das estruturas de concreto armado é prejudicada pela ação deteriorante da penetração de substâncias na forma de gases, vapores e líquidos através de poros e fissuras. Sabe-se que a água, tanto no seu estado puro ou com íons dissolvidos, como os cloretos, sulfato, dióxido de carbono ou oxigênio, pode comprometer a durabilidade das e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/10/2009
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18. Desidratação osmotica e secagem convectiva de maçã : transferencia de massa e alterações de estrutura celular / Osmotic dehydrations and convective drying apple; : mass transfer and cellular structure changes
In this study it was investigated the osmotic dehydration of apples (Fuji variety) followed or not by convective drying with hot air. Concentration profiles were determined for water and solute(s) in samples of apples cut in half and osmotically dehydrated in binary aqueous solutions (30% and 50% sucrose, w/w) and ternary solution (50% sucrose and 10% sodium
Publicado em: 2009
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19. Avaliação das propriedades de transporte de massa contendo adições minerais / Evaluation of the mass transport containing mineral admixtures
The durability of reinforced concrete structures is damaged by the degrading action of the penetration of substances in the form of gases, vapors and liquids through the pores and cracks. It is known that water both in its pure form or containing dissolved ions such as chloride, sulphate, carbon dioxide or oxygen ions, can compromise the durability of concre
Publicado em: 2009
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20. Employment of cathodes of diffusion of oxygen in eletrotrolise of brine to produce chlorine / Emprego de catodos de difusão de oxigenio na eletrolise da salmoura para a produção de cloro
This work is investigating the performance of electrodes modified with gaseous diffusion of particles of Cu, for reduction of oxygen in the production of chlorine during the electrolysis of brine. Initially, the reaction was studied on the anodic oxidation of chloride ion. Using a single cell compartment, with the type DSA anode with an area of 1.5 cm2 as wo
Publicado em: 2009
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21. Degradação de poliestirenossulfonato de sódio fotossensibilizada pelo corante QTX / Degradation of poly(styrenesulfonate) photosensitised by QTX dye
The poly(styrenesulfonate) (PSS) photosensitised by 2-hydroxy-3-(3,4-dimethyl-9-oxo-9H-thioxanthen-2-yloxy)-N,N,N-trimethyl-1-propanium chloride (QTX) solution degradation mechanism was investigated. Initially, the photodegradation of QTX in aqueous solution was studied. The photoproducts generated photolysis were characterized as being sulfones and sulfoxid
Publicado em: 2009
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22. Estudo da corrosão do aço ao carbono em meio de sulfeto
This work presents a study of the 1020 and 1040 carbon steel corrosion in aqueous solution containing dissolved H2S in order to investigate the effect of H2Saq and HSaq species. Some different electrolytes were used: acetic acid buffer and phosphate buffer in presence or absence of 3.5 wt% NaCl solution containing 10, 25, 50, 100, 200, 500, 1000 and 2000 ppm
Publicado em: 2009
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23. Influência do revestimento de argamassa no transporte de cloretos em estruturas de concreto armado inseridas no meio urbano
Taking into account the research carried out in João Pessoa City, Paraíba State, Brazil, a significant number of concrete structures in urban environments and subjected to marine influence are covered by mortar. This way, it was studied the relationship between chloride transport in mortar covering and its influence on protection of covered structures. Pri
Publicado em: 2008
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24. Dispersão de nanopartículas de látex em um cristal líquido liotrópico / Dispersion of nanoparticles of latex in the lyotropic liquid crystal
In this work, we studied the dynamics of agglomeration and dissociation of latex particles when inserted into a lyotropic liquid crystal. This liquid crystal is a ternary system formed by potassium laurate, decilamonium chloride and water, presenting uniaxial calamitic and discotic nematic phases (NC e ND, respectively) and a biaxial nematic phase NB. The la
Publicado em: 2008