Langmuir Blodgett Films
Mostrando 13-24 de 44 artigos, teses e dissertações.
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13. Sensor de NO2 utilizando-se filmes moleculares de macrociclos de porfirinas
The object of this work is the study, characterization and development of new sensors using the LB and LS of thin films deposition techiniques. Such sensors has been used for the gas sensing of NO2, althought, not discarting its use for detecting other gases or substances such as alchools or herbicides, etc. The materials used for assemble the sensors were t
Publicado em: 2009
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14. Tetracationic alkylated porphyrin: Photosensitizers for use in photodynamic therapy of skin cancers / Porfirinas tetracatiônicas alquiladas: sistemas porfirínicos fotossensibilizadores para uso em terapia fotodinâmica do câncer de pele
A series of photosensitizers (PS), which are meso-substituted tetra-cationic porphyrins, was synthesized and characterized in order to study the role of amphiphilicity and zinc insertion in PDT efficacy. The photophysical properties of all compounds are quite similar (absorption maxima in the same region of the spectra, f 0.02; ~0.8). An increase in lipophil
Publicado em: 2009
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15. Metallic surfaces modification through the deposition of LB/LbL organic thin films and hybrid films containing CaCO3 / Modificação de superfícies metálicas por meio da deposição de filmes finos orgânicos LB/LbL e filmes híbridos contendo CaCO3
Muitos organismos vivos, tal como seus constituintes, são formados por sistemas químicos complexos que envolvem a interação entre compostos orgânicos e inorgânicos ligados química e/ou fisicamente. Nestes sistemas as matrizes orgânicas são geralmente compostas por macromoléculas como polissacarídeos e proteínas. Essas moléculas têm o papel de d
Publicado em: 2009
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16. Chemsensor of NO2 gas based on porphyrin of 5, 10, 15, 20-tetraphenylporphyrin LB films and LS films
The sensitivity of 5, 10, 15, 20-tetraphenylporphyrin (H2TPP) to the presence of NO2 gas in diluted solutions and in Langmuir-Blodgett (LB) and Langmuir-Schaefer (LS) films was investigated by UV-visible spectroscopy. The shift of Soret and Q bands were analyzed and the energies involved were calculated. The exposure of LB porphyrin films deposited onto glas
Materials Research. Publicado em: 2008-12
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17. Estudo da interação da peroxidase de raiz forte em interfaces nanoestruturadas / Study of horseradish peroxidase interaction in nanostructured interfaces
A study has been performed on the interaction of the enzyme horseradish peroxidase (HRP) in nanostructured interfaces and their possible application in biosensors for hydrogen peroxide. The nanostructured films were obtained with the Langmuir, Langmuir-Blodgett (LB) and layer-by-layer (LbL) methods. The interaction between HRP and species at interfaces was i
Publicado em: 2008
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18. Liquid-crystalline azopolymers for the fabrication of nanostructured films / Preparação de azopolímeros líquido-cristalinos para a fabricação de filmes nanoestruturados
A birrefringência fotoinduzida e a formação de grades de relevo vêm sendo extensivamente investigadas em filmes de azopolímeros, obtidos por diversas técnicas de fabricação. Embora para azopolímeros amorfos já haja modelos bem estabelecidos tanto para explicar a dinâmica de fotoindução da birrefringência quanto para o transporte de massa que le
Publicado em: 2008
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19. Estudos sobre interações da 2,3,5,6-tetra(-piridil)pirazina (tppz) com európio e efeitos na luminescência do complexo Eu(ttfa)3 / Studies on the interactions of 2,3,5,6-tetra(-pyridyl)pyrazine (tppz) with europium and effects on the luminescence of the Eu(ttfa)3 complex.
In this work, we have conducted studies on the interactions of 2,3,5,6-tetra(-pyridyl)pyrazine (tppz) with Eu3+ in different situations. In the first of them, we have made a detailed study on the ongoing interactions in solution between tris(thenoiltrifluoroacetonate)europium(III), Eu(ttfa)3 and tppz, where it was verified that tppz act as a luminescence sup
Publicado em: 2008
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20. Influência da temperatura e de aditivos na matriz fosfolipídica usada para incorporação de fosfatases alcalinas pela técnica de Langmuir-Blodgett / Influence of the temperature and adtives in phospholipidic matrix utilized to Alkaline Phosphatases incorporation by Langmuir-Blodgett tecnique
ABSTRACT Alkaline phosphatases (AP) are unspecific enzymes that hydrolyze phosphate esthers. In this Dissertation we have studied the adsorption of two forms of AP in phospholipid Langmuir monolayers and Langmuir-Blodgett films, considered as biomembrane models, at different temperatures. Further, the effect of the presence of a disaccharide, trehalose, as w
Publicado em: 2007
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21. Polimetalates porphyrins with ruthenium phosphinics complex to application in homogeny catalyze, Non Linear Optic and Langmuir-Blodgett film preparation / Porfirinas polimetaladas com complexos periféricos de rutênio com aplicações em catálise homogênea, óptica não linear e montagem de filmes de Langmuir-Blodgett
A novel metaloporphyrin with ruthenium complexes, {H2-TPyP[RuCl(dppb)(Xbipy)] 4}(PF6)4 and {M-TPyP[RuCl(dppb)(X-bipy)]4}(PF6)4, (where M = Mn(III), Co(II) and Zn(II), X = Me- MeO- and Cl-) has been synthesized and structurally characterized by 31P{1H} magnetic resonance, UV-Vis and IR spectroscopy, cyclic voltammetry and CHN. The catalytic activity of {Mn-TP
Publicado em: 2007
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22. Efeitos fototérmicos em filmes ultrafinos / Photothermal effects on ultrathin films
Nesta dissertação são estudados três sistemas interfaciais, com o objetivo de observar o efeito do aquecimento localizado por laser. O primeiro sistema consistiu de filmes ultrafinos de níquel ftalocianina tetrasulfonada, com intercalantes diferentes (Zr e PDDA), analisados pela técnica fototérmica de lente térmica (LT). Foi montada uma instrumentaç
Publicado em: 2007
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23. Estudo de monocamadas fosfolipidicas nanoestruturadas obtidas por LB para aplicações em biossensores
There has been long-standing interest in the physical chemical properties of defined mixtures of cholesterol and phospholipids in monolayer and bilayer membranes. They also provide insight into certain properties of the membranes of animal cells. Even if phospholipids and sphingolipids build up the matrix of cellular membranes, sterols are essential componen
Publicado em: 2007
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24. A novel binuclear ruthenium complex: spectroscopic and electrochemical characterization, and formation of Langmuir and Langmuir-Blodgett films
O complexo [{RuCl3(dppb)}2(µ-4,4'-bipy)] (dppb = PPh2(CH2)4PPh2; 4,4'-bipy= 4,4'-bipiridil) foi obtido por meio da reação entre 4,4'-bipiridina e mer-[RuCl3(dppb)].H2O, em bom rendimento. As características do complexo binuclear obtido, estudadas por medidas de FT-IR, UV-Vis, EPR e análise elementar foram similares às do complexo [RuCl3(dppb)L] (L= N-h
Journal of the Brazilian Chemical Society. Publicado em: 2006-12