Towards Internal Structuring of Electrospun Fibers by Hierarchical Self‐Assembly of Polymeric Comb‐Shaped Supramolecules

Ruotsalainen, Teemu; Turku, Jani; Heikkilä, Pirjo; Ruokolainen, Janne; Nykänen, Antti; Laitinen, Teija; Torkkeli, Mika; Serimaa, Ritva; Brinke, G. ten; Harlin, Ali; Ikkala, Olli

doi:10.1002/adma.200401530

Cited by 76 publications

(76 citation statements)

References 31 publications

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“…The same domains as in the bulk have been observed, but they are generally not as well ordered or as regular in shape due to the fast solvent evaporation and mechanical deformation during the electrospinning process [118,119]. Ruotsalainen et al observed lamellar-within-spherical structures for a poly(styrene-b-vinylpyridine) system [119]. Rutledge et al prepared electrospun block copolymers using a co-annular needle system, with the copolymer confined within a shell with a high glass transition temperature [120,121].…”

Section: Fibers Formed From Block Copolymersmentioning

confidence: 62%

“…Block copolymers are generally studied in the bulk or in thin films, but recently there have been some studies of block copolymers in electrospun fibers. The same domains as in the bulk have been observed, but they are generally not as well ordered or as regular in shape due to the fast solvent evaporation and mechanical deformation during the electrospinning process [118,119]. Ruotsalainen et al observed lamellar-within-spherical structures for a poly(styrene-b-vinylpyridine) system [119].…”

Section: Fibers Formed From Block Copolymersmentioning

confidence: 65%

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Hierarchically Structured Electrospun Fibers

Zander

2013

Polymers

121

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Abstract:Traditional electrospun nanofibers have a myriad of applications ranging from scaffolds for tissue engineering to components of biosensors and energy harvesting devices. The generally smooth one-dimensional structure of the fibers has stood as a limitation to several interesting novel applications. Control of fiber diameter, porosity and collector geometry will be briefly discussed, as will more traditional methods for controlling fiber morphology and fiber mat architecture. The remainder of the review will focus on new techniques to prepare hierarchically structured fibers. Fibers with hierarchical primary structures-including helical, buckled, and beads-on-a-string fibers, as well as fibers with secondary structures, such as nanopores, nanopillars, nanorods, and internally structured fibers and their applications-will be discussed. These new materials with helical/buckled morphology are expected to possess unique optical and mechanical properties with possible applications for negative refractive index materials, highly stretchable/high-tensile-strength materials, and components in microelectromechanical devices. Core-shell type fibers enable a much wider variety of materials to be electrospun and are expected to be widely applied in the sensing, drug delivery/controlled release fields, and in the encapsulation of live cells for biological applications. Materials with a hierarchical secondary structure are expected to provide new superhydrophobic and self-cleaning materials.

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Section: Fibers Formed From Block Copolymersmentioning

confidence: 62%

Section: Fibers Formed From Block Copolymersmentioning

confidence: 65%

Hierarchically Structured Electrospun Fibers

Zander

2013

Polymers

121

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“…The electrostatic repulsion between the deposited and incoming bundles may further enhance the parallel alignment since this morphology represents the lowest energy configuration for an array system of charged fibers [12]. Thus, the bundle formation and the self-alignment of the electrospun fibers from PP-g-PS/ PCL-PS blends may be explained as follows: (i) The highly charged viscous jets tightly looped and were preserved in the shape of solid fibers [13], (ii) The significant amount of the residual solvent can produce merged fibers upon reaching the collector [14]; this is due to the fact that the boiling point of DMF is fairly high, and there was not enough time for the solvent in the charged jet to completely evaporate before the "dried" fibers are deposited on the collector [15], (iii) The formation of the bundle and the self-alignment is due to the PS cylindrical confinement and the fact that it is probably located on the surface of the fibers.…”

Section: Resultsmentioning

confidence: 99%

Self-aligned and bundled electrospun fibers prepared from blends of polystyrene (PS) and poly(methyl methacrylate) (PMMA) with a hairy-rod polyphenylene copolymer

Uyar

Cianga

et al. 2009

Materials Letters

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Bundled and self-aligned fibers were obtained by electrospinning blends of polystyrene (PS) and poly (methyl methacrylate) (PMMA) with a hairy-rod polyphenylene-g-polystyrene/poly(a-caprolactone) (PP-g-PS/PCL) copolymer. The self-alignment and bundling characteristics of these electrospun fibers were ascribed to the unique molecular architecture of the conjugated polymer, PP-g-PS/PCL, and its interactions with the solvent and the polymer matrixes used for the electrospinning. The self-alignment and bundling was found to be much more pronounced for PP-g-PS/PCL-PS blend when compared to PP-g-PS/PCL-PMMA blend. Furthermore we found that the degree of self-alignment of the fiber bundles was enhanced by increasing the amount of PP-g-PS/PCL in the blends but the alignment completely disappeared when the solvent dimethylformamide was changed to chloroform.

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“…16 Electrospinning, known as a fabrication process of mesoscale diameter fibers from elongation of polymer solutions under high electrical fields, appears to be one of the promising techniques that allows orientation of copolymer domains. [17][18][19] The nature of electrospinning is based on the generation of a continuously charged jet ejected from a polymer solution droplet to a grounded conductive plate. 20,21 The mechanism of the process is mainly a result of the whipping of the fluid jet originating from the Coulombic interactions between the external electrical field and surface charges on the jet.…”

Section: Introductionmentioning

confidence: 99%

Controlling Spontaneous Emission of CdSe Nanoparticles Dispersed in Electrospun Fibers of Polycarbonate Urethane

et al. 2009

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Luminescent fibrous composite films consisting of submicrometer diameter fibers were prepared by electrospinning of segmented polycarbonate urethane (PCU) in dimethyl formamide and tri-n-octylphosphine oxide (TOPO)-capped CdSe nanocrystals (5 nm in diameter) in toluene. Using a pair of conductive electrodes separated with an air gap, we successfully produced randomly deposited and uniaxially aligned electrospun fibers. The surface structure of the electrospun fibers was studied using atomic force microscopy (AFM) and was compared to the corresponding film prepared by casting. In cast film, tapping mode AFM imaging suggests that hard urethane segments organize into rodlike morphology dispersed in soft polycarbonate. When PCU/CdSe dispersions were subjected to electrospinning, copolymer domains were forced to arrange into lamella along the fiber axis due to elongational flow and high stretching. Molecular orientation in the domains of the composite fibers was confirmed by polarized infrared spectroscopy. We demonstrated that formation of the oriented domains by electrospinning develops a hierarchical structure, which consequently modifies spectral properties because new multiple sharp lines appeared in the photoluminescence (PL) spectra of the fibers. In contrast to randomly deposited fibers, the PL intensity of uniaxially aligned fibers was found to be angle dependent. We propose that the elongated internal structure within the fibers controls the spontaneous emission of CdSe nanoparticles dispersed throughout the electrospun mat. A discussion on the nature of the controlled spontaneous emission is provided.

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Towards Internal Structuring of Electrospun Fibers by Hierarchical Self‐Assembly of Polymeric Comb‐Shaped Supramolecules

Cited by 76 publications

References 31 publications

Hierarchically Structured Electrospun Fibers

Hierarchically Structured Electrospun Fibers

Self-aligned and bundled electrospun fibers prepared from blends of polystyrene (PS) and poly(methyl methacrylate) (PMMA) with a hairy-rod polyphenylene copolymer

Controlling Spontaneous Emission of CdSe Nanoparticles Dispersed in Electrospun Fibers of Polycarbonate Urethane

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