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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
23/02/2012 |
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Autoria: |
MATTOSO, L. H. C.; OLIVEIRA JUNIOR, O. N.; FERREIRA, M. |
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Afiliação: |
EMBRAPA-CNPDIA; USP-IFSC. |
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Título: |
Conducting polymers (for Langmuir-Blodgett film fabrication). |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: SALAMONE, J.C. (Ed.). Polymeric materials encyclopedia. Boca Raton: CRC, 1996. |
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Páginas: |
p. 1432-1439. |
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Idioma: |
Inglês |
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Conteúdo: |
There has been considerable excitement recently over the use of conducting polymers in a variety of technological applications. Some of the applications have already been commercialized, as in the case of rechargeable batteries, conductive textiles, and electrical display. Sophisticated long-term applications are also envisaged for these materials, including the fabrication of molecular electronics devices, that is, devices in which switching and memory phenomena would be controlled at the molecular level. Two main requiremos must be met to achieve such an ambitious goal. First development of the ability to construct structures whouse molecular architecture could be manipulated and appropriately designed. Such structures are most likely to consist of ultra-thin films. Two techniques are available for this purpose, namely the Langmuir-Blodgett (LB) method, which has been investigated extensively for several yearls, and the more recent Self Assembly (SA) technique for building multilayers. These techniques allow the fabrication of ultra-thim (of the order of nm) in the form of multilayers with a high degree of control of orientational order in the case of the LB films, The second requirement concerns the acess to individual molecules. Though substantial research must be carried out before this requirement can be met, the progesss reported in the use of atomic force microscopy (AFM) and scanning tunneling microscopy (STM) on molecular system is most encouraging. It is now possible to image monolayers of simple molecules on graphite and also to probe and manipulate individual molecules at surfaces. We are concerneed with the first of the above-mentioned aspects, focusing on the LB technique that has been exploited worldwide for fabricating ultra-thim films of a variety of materials, including conducting polymers. Because the formation of LB films requires the spreading of a monolayer onto an aqueous subphase, some prerequisites must be fulfilled by the material of interest. It must be soluble in a reasonably volatile organic solvent and also sufficiently surface for spreading to occur. The conducting polymers that were first investigated, namely polyacetylene, polypyrrole, polythiophene, and polyaniline, could not be processed in this manner, and therefore several atrategies were developed for overcoming this difficulty. An overview of these strategies will be provided below, following a brief introduction to LB films. Recent developments on the LB films from polyanilines will then be discussed, followed by a description of the most important properties and some of the possible appications that have been demonstrated for LB films of conducting polymers. MenosThere has been considerable excitement recently over the use of conducting polymers in a variety of technological applications. Some of the applications have already been commercialized, as in the case of rechargeable batteries, conductive textiles, and electrical display. Sophisticated long-term applications are also envisaged for these materials, including the fabrication of molecular electronics devices, that is, devices in which switching and memory phenomena would be controlled at the molecular level. Two main requiremos must be met to achieve such an ambitious goal. First development of the ability to construct structures whouse molecular architecture could be manipulated and appropriately designed. Such structures are most likely to consist of ultra-thin films. Two techniques are available for this purpose, namely the Langmuir-Blodgett (LB) method, which has been investigated extensively for several yearls, and the more recent Self Assembly (SA) technique for building multilayers. These techniques allow the fabrication of ultra-thim (of the order of nm) in the form of multilayers with a high degree of control of orientational order in the case of the LB films, The second requirement concerns the acess to individual molecules. Though substantial research must be carried out before this requirement can be met, the progesss reported in the use of atomic force microscopy (AFM) and scanning tunneling microscopy (STM) on molecular system is most encouraging. It is now possi... Mostrar Tudo |
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Palavras-Chave: |
Polimeros. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03192naa a2200169 a 4500
001 1027112
005 2012-02-23
008 1996 bl --- 0-- u #d
100 1 $aMATTOSO, L. H. C.
245 $aConducting polymers (for Langmuir-Blodgett film fabrication).
260 $c1996
300 $ap. 1432-1439.
520 $aThere has been considerable excitement recently over the use of conducting polymers in a variety of technological applications. Some of the applications have already been commercialized, as in the case of rechargeable batteries, conductive textiles, and electrical display. Sophisticated long-term applications are also envisaged for these materials, including the fabrication of molecular electronics devices, that is, devices in which switching and memory phenomena would be controlled at the molecular level. Two main requiremos must be met to achieve such an ambitious goal. First development of the ability to construct structures whouse molecular architecture could be manipulated and appropriately designed. Such structures are most likely to consist of ultra-thin films. Two techniques are available for this purpose, namely the Langmuir-Blodgett (LB) method, which has been investigated extensively for several yearls, and the more recent Self Assembly (SA) technique for building multilayers. These techniques allow the fabrication of ultra-thim (of the order of nm) in the form of multilayers with a high degree of control of orientational order in the case of the LB films, The second requirement concerns the acess to individual molecules. Though substantial research must be carried out before this requirement can be met, the progesss reported in the use of atomic force microscopy (AFM) and scanning tunneling microscopy (STM) on molecular system is most encouraging. It is now possible to image monolayers of simple molecules on graphite and also to probe and manipulate individual molecules at surfaces. We are concerneed with the first of the above-mentioned aspects, focusing on the LB technique that has been exploited worldwide for fabricating ultra-thim films of a variety of materials, including conducting polymers. Because the formation of LB films requires the spreading of a monolayer onto an aqueous subphase, some prerequisites must be fulfilled by the material of interest. It must be soluble in a reasonably volatile organic solvent and also sufficiently surface for spreading to occur. The conducting polymers that were first investigated, namely polyacetylene, polypyrrole, polythiophene, and polyaniline, could not be processed in this manner, and therefore several atrategies were developed for overcoming this difficulty. An overview of these strategies will be provided below, following a brief introduction to LB films. Recent developments on the LB films from polyanilines will then be discussed, followed by a description of the most important properties and some of the possible appications that have been demonstrated for LB films of conducting polymers.
653 $aPolimeros
700 1 $aOLIVEIRA JUNIOR, O. N.
700 1 $aFERREIRA, M.
773 $tIn: SALAMONE, J.C. (Ed.). Polymeric materials encyclopedia. Boca Raton: CRC, 1996.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Biblioteca(s): |
Embrapa Suínos e Aves. |
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Data corrente: |
26/10/2017 |
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Data da última atualização: |
26/10/2017 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
TAVERNARI, F. de C.; SUREK, D.; FORNAZIER, R.; SORDI, C.; LORENZETTI, W.; ROZA, L. da F.; LIMA, J. F. |
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Afiliação: |
FERNANDO DE CASTRO TAVERNARI, CNPSA; DIEGO SUREK, CNPSA; ROBERT FORNAZIER, UDESC; CARINA SORDI, UDESC; UDESC; LENILSON DA FONSECA ROZA, UDESC; FIBERVITA Processamento de Alimentos Ltda. |
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Título: |
Fibra termoprocessada de mandioca como melhorador de peletes de ração para poedeiras. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
In: CONFERÊNCIA APINCO DE CIÊNCIA E TECNOLOGIA AVÍCOLAS, 2017, Campinas, SP. Anais... Campinas: FACTA, 2017. |
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Idioma: |
Português |
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Conteúdo: |
A peletização é o processamento térmico mais utilizado em rações para aves no Brasil. Rações peletizadas tendem a apresentar benefícios no desempenho animal, como redução na perda de ração no comedouro e melhor ganho de peso. Entretanto, para que estes benefícios ocorram é necessário assegurar a qualidade física dos peletes, que sofre influência direta da composição da ração, do tempo de condicionamento na peletizadora, bem como da temperatura utilizada no processamento (1). É conhecido que o uso de alimentos fibrosos nas rações pode melhorar a qualidade final dos peletes, mas pouco se sabe sobre os efeitos da fibra da mandioca em rações peletizadas. Assim, objetivou-se avaliar a qualidade de peletes de rações com a inclusão de diferentes níveis de fibra termoprocessada de mandioca. |
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Palavras-Chave: |
Galinha de postura; Rações peletizadas. |
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Thesagro: |
Nutrição animal. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/165617/1/final8500.pdf
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Marc: |
LEADER 01531nam a2200217 a 4500
001 2078264
005 2017-10-26
008 2017 bl uuuu u00u1 u #d
100 1 $aTAVERNARI, F. de C.
245 $aFibra termoprocessada de mandioca como melhorador de peletes de ração para poedeiras.$h[electronic resource]
260 $aIn: CONFERÊNCIA APINCO DE CIÊNCIA E TECNOLOGIA AVÍCOLAS, 2017, Campinas, SP. Anais... Campinas: FACTA$c2017
520 $aA peletização é o processamento térmico mais utilizado em rações para aves no Brasil. Rações peletizadas tendem a apresentar benefícios no desempenho animal, como redução na perda de ração no comedouro e melhor ganho de peso. Entretanto, para que estes benefícios ocorram é necessário assegurar a qualidade física dos peletes, que sofre influência direta da composição da ração, do tempo de condicionamento na peletizadora, bem como da temperatura utilizada no processamento (1). É conhecido que o uso de alimentos fibrosos nas rações pode melhorar a qualidade final dos peletes, mas pouco se sabe sobre os efeitos da fibra da mandioca em rações peletizadas. Assim, objetivou-se avaliar a qualidade de peletes de rações com a inclusão de diferentes níveis de fibra termoprocessada de mandioca.
650 $aNutrição animal
653 $aGalinha de postura
653 $aRações peletizadas
700 1 $aSUREK, D.
700 1 $aFORNAZIER, R.
700 1 $aSORDI, C.
700 1 $aLORENZETTI, W.
700 1 $aROZA, L. da F.
700 1 $aLIMA, J. F.
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Embrapa Suínos e Aves (CNPSA) |
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