Electrospun ceramic fibers: Composition, structure and the fate of precursors

Tuttle, Richard W.; Chowdury, A.; Bender, Edward T.; Ramsier, R. D.; Rapp, Jennifer L.; Espe, Matthew P.

doi:10.1016/j.apsusc.2007.12.068

Cited by 36 publications

(17 citation statements)

References 37 publications

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“…Neste caso, a solução precursora contém obrigatoriamente um polímero, o material cerâmico e o solvente [2][3][4][5] . Com este objetivo, Li e Xia [3] prepararam nanofibras de TiO 2 anatase utilizando uma solução precursora contendo poli(vinilpirrolidona) (PVP), tetraisopropóxido de titânio e etanol.…”

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Eletrofiação de polímeros em solução: parte II: aplicações e perspectivas

et al. 2012

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Aplicações Aplicações da eletrofiação no processamento de outros materiais a partir de precursores poliméricosA enorme gama de possibilidades abertas pelo processo de eletrofiação permite que diferentes aplicações sejam derivadas destes materiais, desde aplicações objetivas para o polímero em questão até outras, não tão usuais, como o processamento de precursores de outros materiais.Assim, uma das aplicações do processo de eletrofiação é a preparação de nanofibras cerâmicas através do tratamento térmico dos compósitos eletrofiados. Neste caso, a solução precursora contém obrigatoriamente um polímero, o material cerâmico e o solvente [2][3][4][5] . Com este objetivo, Li e Xia [3] prepararam nanofibras de TiO 2 anatase utilizando uma solução precursora contendo poli(vinilpirrolidona) (PVP), tetraisopropóxido de titânio e etanol. As mantas obtidas foram calcinadas em temperatura de 500 °C resultando em nanofibras de TiO 2 anatase com diâmetros na faixa de 20 a 200 nm. Azad [5] fabricou nanofibras transparentes de alumina (Al 2 O 3 ) utilizando uma solução precursora de 2,4 -pentanodionato de alumínio em acetona misturada com uma , o processo de eletrofiação foi discutido, incluindo suas bases teóricas e experimentais, e a obtenção de diferentes nanofibras de materiais poliméricos. Neste segundo artigo de revisão, são abordados os aspectos relacionados à aplicação de materiais eletrofiados em diferentes áreas, como médica, agrícola, sensores, processamento de outros materiais, entre outras. São também discutidas as técnicas de caracterização utilizadas mais frequentemente nestes materiais, e suas potencialidades. Esta segunda revisão é complementar à anterior e segue, em seus aspectos gerais, a mesma terminologia. Palavras-chave: Eletrofiação, nanocompósitos, catálise, sensores, blendas, microscopia, espalhamento de raio X. Electrospinning of Polymers in Solution. Part II: Applications and PerspectivesAbstract: In our previous review [1] , the process of electrospinning was discussed on the basis of theoretical and experimental aspects toward preparation of different polymeric nanofibers. In this second review, we focus on the aspects related to the application of electrospun materials in various fields such as medicine, agriculture, sensors, and processing of other materials. We discuss the most often characterization techniques used for these materials and their potential. This review complements the previous one and uses the same terminology.

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Eletrofiação de polímeros em solução: parte II: aplicações e perspectivas

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“…In the case of the melt the discharged jet solidifies when it travels in the air. Many reports have appeared in the literature in the past few years on the fabrication of alumina nanofibers as the viscosity of the boehmite gel is well suited for the electrospinning technique [5,34,48,50,51,53]. The gel solution for the spinning consisted of nanofibrous colloid prepared by the sol-gel or hydrothermal processes, however, the precursor mixture may also be used.…”

Section: Electrospinningmentioning

confidence: 99%

“…The boehmite formed nanosheets in the sol and gelling process and the curled up fibers or tubes were visible in the TEM images of the boehmite. Alumina nanofibers can be synthesized with metallic aluminum particles [10,22,43,59], Al alkoxides [ 36; 46, 17] or its salts [27,45,47,48,49,51] as the starting materials. Other starting materials that have been used include Al pentanedionate, [50], aluminum hydroxide, [52], alumina composite, [53] aluminum film, [42] and sodium aluminate.…”

Section: Hydrothermal and Sol Gel Processesmentioning

confidence: 99%

Synthesis of Alumina Nanofibers and Composites

Noordin¹,

Liew²

2010

Nanofibers

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IntroductionAlumina, Al 2 O 3 , is a ceramic metal oxide of great importance as building material, refractory material, electrical and heat insulator, attributed to its high strength, corrosion resistance, chemical stability, low thermal conductivity, and good electrical insulation. One phase of alumina, the -phase is widely used as catalyst, catalyst support and adsorbent because its high porosity and surface area. It is conventionally prepared by heating the hydrated trihydroxides, gibbsite and bayerite, to temperature of > 1000 o C to obtain the -alumina, corundum, a material with great hardness and low surface area. The trihydroxides, gibbsite, bayerite, both are Al(OH) 3. nH 2 O and the monohydroxyl oxide, boehmite, AlO(OH)·αH 2 O, have the monoclinic crystal structure with similar lattice parameters (a=0.866 nm, b=0.506 nm, c=0.983 nm, =94°34′ in boehmite, a=0.868 nm, b=0.507 nm, c=0.972 nm, =94°34′ in gibbsite, and a=0.867 nm, b=0.506 nm, c=0.942 nm, =90°26′ in bayerite [1,2]. In the process of heat treatment, the trihydroxide undergoes a series of transformations. It loses the water of hydration, then dehydroxalate at < 300 o C to form the monohydroxyl oxide boehmite, AlO(OH), which on further heating to increasingly higher temperatures, changes to the transition aluminas, including the -, -, -, and -phases, which then transform finally to the -form. These transition aluminas are crystalline solids with high porosity and surface areas as well as acidic and basic properties, which make them suitable as adsorbents, catalyst, catalyst support and fabricated into filtration membranes as well as used as fillers or components in polymer/ inorganic composite materials with enhanced mechanical properties. The conventional alumina as obtained are usually powder of particulates. These could be fabricated into alumina fibers by various method, through melt growth techniques including the internal crystallization method and extrusion, electrospraying [3] and electrospinning [4][5][6][7][8] have been developed for producing Al 2 O 3 fibers. The high surface areas of transition aluminas are due to the presence of pores. These pores are irregular in sizes and size distributions, and are mainly micropores of diameter less than 2 nm. Since the synthesis of mesoporous materials was first reported in the late 1980s , a number of methods for the synthesis of mesoporous alumina have been reported [8,9]. More recently, interest in nano-materials and nanotechnology has spurred a fury of investigations

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“…In addition, alumina nanofibers can easily be prepared by using the electrospinning (ES) technique [9][10][11]. We have also formed alumina nanofibers by heating poly(vinyl alcohol) (PVA)/boehmite [AlO(OH)·H2O] nanoparticle composite nanofibers obtained by ES [12].…”

Section: Introductionmentioning

confidence: 99%