A Combinatorial Approach for Colorimetric Differentiation of Organic Solvents Based on Conjugated Polymer‐Embedded Electrospun Fibers

Yoon, Jonghun; Jung, Young‐Sik; Kim, Jong-Man

doi:10.1002/adfm.200800963

Cited by 109 publications

(90 citation statements)

References 51 publications

(29 reference statements)

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“…Yoon et al [66] apresentam uma estratégia de diferenciação colorimétrica de solventes orgânicos baseada na fabricação combinatória de mantas eletrofiadas de PEO contendo concentrações variadas de dois derivados de polidiacetileno. Diferentes padrões de cores são obtidos conforme o solvente ao qual as mantas foram expostas.…”

Section: Microscopiaunclassified

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

et al. 2012

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“…a photon energy storage material and a colorimetric indicator of the storage) as the photoisomerization of azobenzene groups and the consequent steric repulsion between the side chains may control the conjugation length of the polymer backbone reversibly. In fact, polydiacetylenes generally exhibit colorimetric transitions (usually from blue to red) 40 upon various stimuli such as heat, 41 mechanical perturbation, 42 and solvents, 43 which shorten the conjugation of the polymer backbones. We also observed the reversible blue 4 red thermochromism of polymer lms (ESI Fig.…”

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Photon energy storage materials with high energy densities based on diacetylene–azobenzene derivatives

et al. 2016

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Photocontrolled self-assembly of molecules has been utilized to change the physical properties of organic materials for various applications, while photon energy storage materials that incorporate photochromic molecules such as azobenzenes have been recognized as another highly attractive class of materials that convert and store photon energy in the strained chemical bonds. Herein, we demonstrate the photocontrolled self-assembly and disassembly of photon energy storage materials based on new diacetylene derivatives with azobenzene moieties and with varied alkyl spacers and linkers. We

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“…1(l)). 11,14 Both theory and experiment show that most solvent evaporates after fibers have landed on the collector walls. Therefore, jet extension dominates the process controlling fiber radius.…”

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A simple model for nanofiber formation by rotary jet-spinning

Mellado

McIlwee

Badrossamay

et al. 2011

Applied Physics Letters

104

128

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Nanofibers are microstructured materials that span a broad range of applications from tissue engineering scaffolds to polymer transistors. An efficient method of nanofiber production is Rotary Jet-Spinning (RJS), consisting of a perforated reservoir rotating at high speeds along its axis of symmetry, which propels a liquid, polymeric jet out of the reservoir orifice that stretches, dries and eventually solidifies to form nanoscale fibers. We report a minimal scaling framework complemented by a semi-analytic and numerical approach to characterize the regimes of nanofiber production, leading to a theoretical model for the fiber radius consistent with experimental observations. In addition to providing a mechanism for the formation of nanofibers, our study yields a phase diagram for the design of continuous nanofibers as a function of process parameters with implications for the morphological quality of fibers.The combination of high surface area (10 3 m 2 /g), 1 mechanical flexibility, and directional strength make nanofibers an ideal platform for a diverse range of applications. [1][2][3] While nanofibers are most commonly produced using electrospinning, 4,5 we have recently demonstrated that Rotary Jet-Spinning (RJS) can be used as an alternative technique to fabricate sub-micron fibers using rotational inertial forces to extrude viscous polymer jets. 6,7,8 Our apparatus consists of a perforated reservoir containing polymer solutions attached to a motor (Fig. 1(a)). When the reservoir is spun about its axis of symmetry at a rate larger than a threshold determined by the balance between capillary and centrifugal forces, a viscous jet is ejected from a small orifice (Fig. 1(b)). This jet is thrown outwards along a spiral trajectory as solvent evaporates, owing to its relatively high surface area (Fig. 1(c-f)). While moving, it is extended by centrifugal forces (Fig. 1(g-j)) and solvent evaporates at a rate J, dependent on the diffusion coefficient D of solvent through the polymer (Fig. 1(k)). The jet travels until it reaches the walls of the stationary

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A Combinatorial Approach for Colorimetric Differentiation of Organic Solvents Based on Conjugated Polymer‐Embedded Electrospun Fibers

Cited by 109 publications

References 51 publications

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

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

Photon energy storage materials with high energy densities based on diacetylene–azobenzene derivatives

A simple model for nanofiber formation by rotary jet-spinning

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