Effect of calcium phosphate coating on polyamide substrate for biomaterial applications

Bandeira, Lucimara C.; Ciuffi, Kátia J.; Calefi, Paulo S.; Nassar, Eduardo J.; Silva, Jorge Vicente Lopes da; Oliveira, Marcelo Fernandes de; Maia, Ivan Ferrer; Salvado, Isabel M. Miranda; Fernandes, Maria Helena

doi:10.1590/s0103-50532012000500004

Cited by 11 publications

(10 citation statements)

References 23 publications

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“…A banda em 3295 cm -1 característica do grupo -NH. 13,19 Pode se observar que as bandas características dos polímeros PA e PI estão presentes no espectro da membrana de PA incorporada com o óxido de ítrio e alumínio e posteriormente revestida com o PI, indicando a presença do revestimento na membrana.…”

Section: Difração De Raios X (Drx)unclassified

ÓXIDO DE ÍTRIO E ALUMÍNIO DOPADO COM Yb3+ E Er3+ INCORPORADO EM MEMBRANA DE POLIAMIDA

Souza¹,

Moscardini²,

Faria³

et al. 2018

Quim. Nova

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YTTRIUM ALUMINUM OXIDE DOPED WITH Yb 3+ AND Er 3+ INCORPORATED INTO POLYAMIDE MEMBRANE. Lanthanide ions have special light emission, which can occur through descending and ascending energy conversion. Ascending energy conversion is especially interesting for bioapplications because excitation in the infrared region does not excite biomolecules and therefore does not interfere in detection, not to mention that it penetrates deeper in the skin. Here, we synthesized yttrium and aluminum oxide doped with Yb 3+ and Er 3+ ions via the non-hydrolytic sol-gel methodology. The doped matrix was incorporated and dispersed over a polyamide membrane obtained by Additive Manufacturing. X-ray diffraction revealed that a mixture of yttrium aluminum monoclinic and garnet phases emerged. Upon excitation at 980 nm in the Yb 3+ ion, the Er 3+ presented more intense emission as a function of the laser power, which favored red emission. The intensities of the bands corresponding to the 4 S 3/2 → 4 I 15/2 (563 nm) and 5 F 9/2 → 4 I 15/2 (660 nm) transitions involved the absorption of two photons. The oxide incorporated into the polyamide membrane presented the same behavior. After coating with polyetherimide, the latter system was resistant to 5.1 W laser, which paves the way for new applications.

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Section: Difração De Raios X (Drx)unclassified

ÓXIDO DE ÍTRIO E ALUMÍNIO DOPADO COM Yb3+ E Er3+ INCORPORADO EM MEMBRANA DE POLIAMIDA

Souza¹,

Moscardini²,

Faria³

et al. 2018

Quim. Nova

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“…Recently, our group has studied the effects of TiO 2 and Nb 2 O 5 on the optical and structural properties of a network glass with a composition of 20Na 2 5 1 and verified that Nb 2 O 5 may provide higher chemical durability than does TiO 2 , a typical intermediate. At the same time, Nb 2 O 5 also afforded a higher refractive index, which is extremely important for optical devices.…”

Section: Introductionmentioning

confidence: 91%

“…Compared to silicate glasses, phosphate glasses have attractive structural and optical properties for application in industry, such as the ability to dissolve large quantities of alkali metal oxides and alkaline earth, transition, and rare‐earth ions; high coefficients of thermal expansion; low melting points; high ionic conductivity; excellent optical transparency; good thermal stability and mechanical properties and good chemical durability in the presence of oxides intermediates and modifier networks . Such glasses can be applied as biomaterials, semiconductors, ionic conductors, and waveguides doped with lanthanide ions …”

Section: Introductionmentioning

confidence: 99%

“…32 The aim of this work was to study the effect promoted in the structural and optical properties of a phosphate chain by substituting a typical intermediate oxide, TiO 2 , by the typical glass former oxide GeO 2 , in a series of glass systems previously studied by Teixeira et al 1 and Bozelli et al, 2 with the intent of improve its structural and optical properties. Then, a series of glass systems with compositions of 20Na 2 5,10,15), y = (0, 1), z = (0, 2) mol%, were investigated with respect to their structural, optical, and luminescence properties. The TiO 2 was replaced by GeO 2 allowing the glass stabilization against devitrification and the improvement of optical properties useful for optical waveguide amplifiers.…”

Section: Introductionmentioning

confidence: 99%

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Structural and Optical Properties of Erbium and Ytterbium Codoped Germanoniobophosphate Glasses

2014

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A series of glasses with compositions of 20Na2O–30Nb2O5–(5−y−z)Al2O3–30P2O5–(15−x)TiO2–xGeO2–yEr2O3–zYb2O3, where x = (0; 5; 10; 15), y = (0; 1), z = (0; 2) mol%, were investigated with respect to their structural, optical, and luminescence properties. The coordination of the germanium(IV) ion is normally reported as being mainly tetrahedral. However, results of this study suggest that the germanium(IV) ion may have an octahedral coordination and that TiO2 is substituted. This proposition can be done mainly by 31P MAS‐NMR spectroscopy, which spectra show predominantly pyrophosphate chains in the different glasses, without changes in their polymerization after substitution. A similar coordination of germanium can also be identified by the photoluminescence behavior of the different codoped samples, which shows similar erbium(III) emission decay lifetimes (5 ms), and Judd–Ofelt intensity parameters. It was found that the upconversion emission process involved 1.5 photons. Regarding the thermal behavior, it is noted that the glasses containing higher proportions of GeO2 exhibit higher thermal stability and are therefore more resistant to devitrification when compared to compositions containing more TiO2.

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“…15,34,38 Segundo Ballistreri et al, 39 a degradação das poliamidas, em geral, ocorre em temperaturas superiores a 400 ºC e, neste trabalho, a degradação ocorreu em temperaturas acima de 450 o C (Tabela 1), esse aumento pode estar relacionado às formas α e g e o número de ligações de hidrogênio entre as cadeias. 40,41 As membranas modificadas com CPTES e TEOS CPTES apresentaram temperaturas superiores às membranas não modificadas, indicativo de mudanças na propriedade térmica da PA por meio da incorporação dos alcóxidos.…”

Section: Figura 3 Ft-ir Da Membrana De Pa (A) Modificada Com Cptes unclassified

Modificação de membrana de poliamida via sol-gel e incorporação de composto de európio (III) luminescente

et al. 2016

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. Over the last decades, the combination of different technologies to search for systems with new properties and features has brought various segments of biological and earth sciences together. Additive manufacturing, known as rapid prototyping, combined with the sol-gel methodology enables the production of novel systems with applications in many scientific fields. In this work, flexible polyamide membranes were obtained by additive manufacturing, functionalized by the sol-gel methodology, and incorporated with the coordination compound between Eu(III) and 1,10-phenanthroline. The presence of vibrations at 1100 cm -1 in the FTIR spectrum of the material, which is a band typical of the Si-O-Si group in the alkoxide employed during the process, confirmed the polyamide membrane functionalization. The thermogravimetric curve showed that a residue remained after heating at 700 o C, which was attributed to SiO 2 . The membrane was highly luminescent, which confirmed incorporation of the Eu 3+ compound into the material and pointed to the possible application of this system as a topical medication for the treatment of skin diseases.Keywords: sol-gel; photodynamic therapy; luminescence; europium III compounds. INTRODUÇÃOA terapia fotodinâmica (TFD) é uma técnica aplicada no tratamento de câncer de pele e que utiliza a luz (radiação eletromagnética) para tal. Resumidamente, a área tratada é exposta a radiação monocromática, região do visível (600 à 800 nm), após a administração de um fotossensibilizador que absorve a radiação e em seguida transfere a energia ao oxigênio molecular, gerando espécies reativas de oxigênio e, consequentemente, a oxidação dos lipídios, aminoácidos e proteínas, o que resulta na destruição do tumor.1,2 A técnica TFD utiliza emulsões, microemulsões, nanoemulsões, que são aplicadas diretamente sobre a pele e, após um determinado tempo, são absorvidas pelas células tumorais. A literatura tem relatado a utilização de vários sistemas que contém nanopartículas e fotossensibilizados. [3][4][5] Os elementos lantanídeos apresentam, como uma de suas principais carcterísticas, a propriedade fotoluminescentes, amplamente aplicadas na geração de radiação eletromagnética nas regiões do visível e infravermelho. As transições interconfiguracionais f -f são as responsáveis por essas propriedades.6-8 Os íons lantanídeos podem sofrer excitação nas regiões do ultravioleta, visível e infravermelho, o que resulta em linhas de emissão monocromáticas na região do visível e do infravermelho. Por exemplo, o íon Eu 3+ apresenta intensa emissão na região vermelha do espectro eletromagnético, aproximadamente em 620 nm, quando excitado no ultravioleta (394 nm) e visível (460 nm).9-11 A combinação de elementos adequados também pode apresentar alta eficiência de emissão na região do visível quando se utiliza a radiação infravermelha, chamado de conversão ascendente, como por exemplo o par Yb 3+ -Tm 3+. 12 Portanto, os íons lantanídeos apresentam características para serem utilizados como emissores de radiação na região visíve...

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Effect of calcium phosphate coating on polyamide substrate for biomaterial applications

Cited by 11 publications

References 23 publications

ÓXIDO DE ÍTRIO E ALUMÍNIO DOPADO COM Yb3+ E Er3+ INCORPORADO EM MEMBRANA DE POLIAMIDA

ÓXIDO DE ÍTRIO E ALUMÍNIO DOPADO COM Yb3+ E Er3+ INCORPORADO EM MEMBRANA DE POLIAMIDA

Structural and Optical Properties of Erbium and Ytterbium Codoped Germanoniobophosphate Glasses

Modificação de membrana de poliamida via sol-gel e incorporação de composto de európio (III) luminescente

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