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roughness Control of Layer-by-Layer and Alternative Spray Films from Congo red and PAH via Laser Light Irradiation

Materials Sciences and Applications 2012年第8期3卷 552-556页

作者： Gleidson Cardoso romário J.da silva rafael r.G.Maciel Nara C.de Souza josmary.r.silva Grupo de Materiais Nanoestruturados Universidade Federal de Mato Grosso Barra do Garcas Brazil

Films from congo red (Cr) alternated with poly(allylamine hydrochloride), PAH, were prepared by layer-by-layer and alternative spray techniques. In order to investigate the change of roughness induced by laser light irradiation (532 nm), both kinds of films were characterized by using UV-visible spectroscopy and atomic force microscopy (AFM). At dif- ferent irradiation times, layer-by-layer, LbL, films showed small changes in the roughness and irregular behavior, whereas spray films exhibited higher and a regular decreasing of roughness with increasing irradiation time. The higher roughness of spray films as compared with the LbL ones was attributed to different formation mechanisms of the films. The decreasing of the roughness as a function of the irradiation time (exhibited by the spray films) was associated to surface relaxation due to the interplay between photoisomerization of congo red dye and the heating of the sample during the laser light irradiation. The results suggested that the alternative spray technique is the best choose to control of roughness of the films by using light irradiation.

关键词： Congo red Poly(Allylamine Hydrochloride) Layer-by-Layer Films roughness Control Laser Light Irradiation

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Morphological Structure Characterization of PAH/NiTsPc Multilayer Nanostructured Films

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Materials Sciences and Applications 2011年第11期2卷 1661-1666页

作者： josmary.r. silva Jackeline B. Brito Sonia T. Tanimoto Nara C. de Souza 不详

Morphological structure and growth process of LbL nanostructured films from nickel tetrasulfonated phthalocyanine (NiTsPc) alternated with polyallylamine hydrochloride (PAH) were investigated. The experimental results of UV-visible adsorption kinetics (modeled by Johnson-Mehl-Avrami functions) and AFM images analyzes suggested that the surface morphology structure of films is formed by rod-shaped aggregates produced by a two-step growth process: nucleation and diffusion-limited growth.

关键词： Phthalocyanine Layer-By-Layer Films Growth Processes Adsorption Kinetics

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Evaluation of the Antimicrobial Activity of Stryphnodendron barbatiman against Citrobacter freundii

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Materials Sciences and Applications 2013年第12期4卷 780-785页

作者： Nara Cde Souza Marcio N.Gomes rafael r.G.Maciel romário Jda silva Tarquin F.Trescher Filipe D.S.Gorza Graciela C.Pedro Kennedy C.S.Correa Marcio C.r.Souza josmary.r.silva Grupo de Materiais Nanoestruturados Universidade Federal de Mato GrossoBarra do GarçasBrazil Faculdades Padrao GoianiaBrazil

Medicinal plants have been presented as a valuable source of preservation of human health. In special, Stryphnodendron barbatiman has been employed due to its antimicrobial activity. This plant is rich in tannins and has been used in popular medicine for the treatment of gastrointestinal disorder, treatment of lesions, and also as anti-inflammatory microbicide. Citrobacter freundii is a member of the family Enterobacteriaceae and is one of the major causes of opportunistic infections. This microorganism is a bacterium (bacillus) aerobic gram-negative with a length in the range of 1 to 5 mm. C. freundii is commonly found in water, soil, food and occasionally in the gastrointestinal tract of animals and humans. In this paper, we have demonstrated the antibacterial activity of S. barbatiman by observing cellular death by using inhibition halo approach. Atomic force microscopy and FT-Ir spectroscopy results suggested that interaction between the main active components of S. barbatiman with cellular wall of C. freundii gives rise to cellular wall damage, and then leads this microorganism to death.

关键词： Stryphnodendron barbatiman Citrobacter freundii Atomic Force Microscopy Antimicrobial Activity

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