Silver Nanoparticle
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Antibacterial properties of silver nanoparticles synthesized by marine Ochrobactrum sp.
Metal nanoparticle synthesis is an interesting area in nanotechnology due to their remarkable optical, magnetic, electrical, catalytic and biomedical properties, but there needs to develop clean, non-toxic and environmental friendly methods for the synthesis and assembly of nanoparticles. Biological agents in the form of microbes have emerged up as efficient
Braz. J. Microbiol.. Publicado em: 2014-12
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14. SPR biosensors based on gold and silver nanoparticle multilayer films
Filmes em multicamadas de nanopartículas de ouro e prata foram utilizados para o desenvolvimento de um sensor plasmônico para detecção de ligações entre moléculas orgânicas e/ou com atividade biológicas. A sensibilidade a eventos de ligação é relacionada a deslocamentos energéticos da ressonância de plasmon de superfície nos filmes de nanopart
J. Braz. Chem. Soc.. Publicado em: 2014-05
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15. Screening of different Fusarium species to select potential species for the synthesis of silver nanoparticles
Onze diferentes espécies de Fusarium foram isoladas a partir de vários materiais vegetais infectados e selecionados para escolher uma espécie potencialmente importante para a síntese de nanopartículas de prata. Todos os isolados foram identificados com base nas características de cultivo e microscópicas usando as chaves de identificação de Fusarium.
J. Braz. Chem. Soc.. Publicado em: 2013-12
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16. Silver nanoparticle production by the fungus Fusarium oxysporum: nanoparticle characterisation and analysis of antifungal activity against pathogenic yeasts
The microbial synthesis of nanoparticles is a green chemistry approach that combines nanotechnology and microbial biotechnology. The aim of this study was to obtain silver nanoparticles (SNPs) using aqueous extract from the filamentous fungus Fusarium oxysporum as an alternative to chemical procedures and to evaluate its antifungal activity. SNPs production
Mem. Inst. Oswaldo Cruz. Publicado em: 2013
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17. Influência dos precursores de prata no crescimento de nanopartículas metálicas em vidros óxidos de metais pesados
In this work we report a systematic study on the influence of the chemical nature of silver precursors on the formation of glass-ceramics from oxide glasses. Thermal, structural and optical properties were analyzed as a function of the glass composition. Controlled crystallization was achieved by thermal treatment of the samples above glass transition. The i
Quím. Nova. Publicado em: 2013
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18. Ação antibacteriana de nanopartículas de prata em Poli (ácido lático) : PLA e estudo da biodegradação / Ação antibacteriana de nanopartículas de prata em Poli (ácido lático) : PLA e estudo da biodegradação
A contaminação biológica causa grande preocupação na indústria de polímeros, cujos materiais são usados para embalagens de alimentos. A maior parte das bactérias se encontra associadas a um biofilme; complexo ecossistema microbiano, bem estruturado; sendo assim, é essencial buscar alternativas que proporcionem a redução do acúmulo de biofilme na
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/05/2012
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19. Preparação de nanopartículas de prata e ouro: um método simples para a introdução da nanociência em laboratório de ensino
A new practical experiment involving silver and gold nanoparticle syntheses was introduced in an inorganic chemistry laboratory course for undergraduate students at the Institute of Chemistry, UNICAMP. The nanoparticles were synthesized by the reduction of silver nitrate and tetrachloroauric acid with sodium borohydride and sodium citrate in an aqueous mediu
Quím. Nova. Publicado em: 2012
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20. Síntese e estudo da atividade eletrocatalítica de óxidos de metais de transição e de nanopartículas de prata e ouro para a reação de redução de oxigênio / Synthesis and study of the electrocatalytic activity of transition metal oxides, and silver and gold nanoparticles for the oxygen reduction reaction
The oxygen reduction reaction (ORR) was studied on electrocatalysts composed by pure and mixed transition metal oxides of Mn, Co, and Ni, including spinel-like structures, and by Ag, Au, and Ag3M/C (M= Au, Pt, Pd e Cu) bimetallic nanoparticles, in alkaline electrolyte. The transition metal oxides were synthesized by thermal decomposition of their nitrates, a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2011
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21. Estudo das ressonâncias de plasmon em filmes silicatos com nanopartículas de Ag interagentes
In this work, the behavior of surface plasmon resonance from layers of silver nanoparticles embedded in silicon dioxide or on surfaces of silicon dioxide was studied. Structural properties of the produced films were characterized by transmission electron microscopy, while the optical properties were studied with a spectrophotometer. Results showed average na
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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22. Desenvolvimento de nanobiocompósitos contendo nanopartículas de prata para aplicações bactericidas / Development of novel silver nanoparticles-based nanocomposites for bactericidal applications
The work reported here was aimed at developing chitosan/AgNPs based nanobiocomposits for bactericidal applications. The studies were divided into four main steps, viz.,: i) optimization of the silver colloids stabilition process, in which the use of chitosan resulted in the best stability, ii) a detailed investigation on the interactions between chitosan and
Publicado em: 2010
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23. Synthesis of Ag-PVA and Ag-PVA/PET-s20 composites by supercritical CO2 method and study of silver nanoparticle growth
CO2 supercrítico foi utilizado para preparar compósitos poliméricos com prata, prata/poli álcool vinílico e prata/ poli álcool vinílico/ poli (tereftalato de etileno) sulfonado, pela impregnação de um precursor de prata nas matrizes poliméricas no estado sólido seguida da redução térmica do precursor. Difração de raio X, microscopia eletrôni
Journal of the Brazilian Chemical Society. Publicado em: 2008
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24. The structural basis for giant enhancement enabling single-molecule Raman scattering
We find that giant surface-enhanced Raman scattering for adsorbates on silver surfaces is present only on surfaces that exhibit self-similar fractal topology as inferred from atomic force microscopy. The fractal character results in localizing the energy of incident photons to volumes of a few nanometers on a side, millions of times smaller than the diff
National Academy of Sciences.