Effect of polymer nanofibers thermoelasticity on deformable fluid-saturated porous membrane

Azra, Charly; Alhazov, Dimitry; Zussman, Eyal

doi:10.1016/j.polymer.2014.12.062

Cited by 18 publications

(13 citation statements)

References 31 publications

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“…This is a very well-known fact and this behavior is similar to the solvent-triggered shape-memory polymers and temperature-driven contraction of electrospun fi bers. [ 2,27,28 ] Also, the oriented fi bers are present in a layer-by-layer structure with many contact points between the fi bers. The shrinkage in the direction of fi ber orientation together with expulsion of water between the fi bers lead to the slight expansion in the direction perpendicular to the fi ber orientation.…”

Section: Resultsmentioning

confidence: 99%

Giving Direction to Motion and Surface with Ultra‐Fast Speed Using Oriented Hydrogel Fibers

Liu

Jiang

Sun

et al. 2015

Adv Funct Materials

129

100

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Thermoresponsive hydrogel fibrous membranes showing directionally controlled movements and surface change with ultra‐fast speed are presented for the first time. They show reversible coiling, rolling, bending, and twisting deformations in different controllable directions for many cycles (at least 50 cycles tried) with inside‐out change in surfaces and shapes. Speed, reversibility, large‐scale deformations and, most importantly, control over the direction of deformation is required in order to make synthetic actuators inspired from natural materials or otherwise. A polymeric synthetic material combining all these properties is still awaited. This issue is addressed and provide a very simple system fulfilling all these requirements by combining porosity and asymmetric swelling/shrinking via orientation of hydrogel fibers at different angles in a fibrous membrane. Electrospinning is used as a tool for making membranes with fibers oriented at different angles.

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Section: Resultsmentioning

confidence: 99%

Giving Direction to Motion and Surface with Ultra‐Fast Speed Using Oriented Hydrogel Fibers

Liu

Jiang

Sun

et al. 2015

Adv Funct Materials

129

100

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show abstract

“…[42] It is known from the literature that, in several cases, the electrospun fibers are collected in an energetically unstable stretched state just after spinning and try to acquire the low-energy unstretched conformation when heated near their glass transition temperature or come in contact with an appropriate solvent due to the chain movement. [3,8,43] The glass transition of electrospun PLA fibers is around 50 °C, as noted from DSC ( Figure S1, Supporting Information). PLA fibers, when put in water at 40 °C, most probably led to easy chain movement due to the combined effect of temperature close to T g and plasticization by water and hence the shrinkage.…”

Section: Resultsmentioning

confidence: 76%

“…Therefore, change in the crystallinity or melting of crystallites could not be the reason of causing shrinkage . It is known from the literature that, in several cases, the electrospun fibers are collected in an energetically unstable stretched state just after spinning and try to acquire the low‐energy unstretched conformation when heated near their glass transition temperature or come in contact with an appropriate solvent due to the chain movement . The glass transition of electrospun PLA fibers is around 50 °C, as noted from DSC (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 92%

Self‐Rolled Porous Hollow Tubes Made up of Biodegradable Polymers

Peng

Zhu

Agarwal

2017

Macromol. Rapid Commun.

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A tubular highly porous scaffold of polylactide (PLA) and poly-ε-caprolactone (PCL) is fabricated by self-rolling of a 2D fibrous bilayer of PLA and PCL in water without use of any classical thermo-/pH-responsive polymers. The self-rolling and diameter of the tube are dependent upon the bilayer thickness and temperature. A 75 µm thick 2D bilayer (PLA = 25 µm; PCL = 50 µm) rolls to a hollow tube of diameter around 0.41 mm with multilayered wall at 40 °C within 5 min. The tubes keep their form and size in water at all temperatures once they are formed. The interesting properties of the hollow tubes, that is, permeation of gases through the walls and flow of water without leakage under tested conditions in combination with good mechanical stability, use of only biodegradable polymers, and easy and reproducible fabrication method, allow them to be promising candidates for future studies as scaffolds for tissue engineering.

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“…Recently, electrospinning, which has been recognized as one of the most convenient, direct and economical methods for the fabrication of polymer nanofibers, arouses much attention of materials scientists all over the world [1][2][3][4][5]. This method not only attracts extensive academic investigations, but is also applied in many areas such as filtration [6], optical and chemical sensors [7], biological scaffolds [8], display devices [9] and nanocables [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The as-prepared CoFe2 O 4 nanofibers, [CoFe 2 O 4 /PMMA] @[[Tb(BA) 3 (phen) ? Eu(BA) 3 (phen)]/PMMA] coax-ial nanobelts and CoFe 2 O 4 /[Tb(BA)3 (phen) ?…”

mentioning

confidence: 99%

Facile electrospinning construction and characteristics of coaxial nanobelts with simultaneously tunable magnetism and color-tuned photoluminescence bifunctionality

Xue

Sun

et al. 2015

J Mater Sci: Mater Electron

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New-typed coaxial nanobelts with magnetism and tunable fluorescent color bifunctionality have been successfully fabricated by electrospinning technology using a specially designed coaxial-spinneret. The synthesized coaxial nanobelts are composed of CoFe 2 O 4 /polymethyl methacrylate (PMMA) as the magnetic core and [Tb(BA) 3 (phen) ? Eu(BA) 3 (phen)]/PMMA (BA = benzoic acid, phen = 1,10-phenanthroline) as the photoluminescent shell. The morphology and properties of the final products have been investigated in detail by X-ray diffractometry, scanning electron microscopy, biological microscopy, vibrating sample magnetometry and fluorescence spectroscopy. The emitting color of the coaxial nanobelts can be tuned by adjusting the mass ratios of Tb(BA) 3 (phen) and Eu(BA) 3 (phen) in a wide color range from red to yellow to green under the excitation of 274-nm single-wavelength ultraviolet light. The luminescent intensity and magnetic property of the coaxial nanobelts can also be tuned. Furthermore, the coaxial nanobelts provide higher luminescent performance than CoFe 2 O 4 /[Tb(BA) 3 (phen) ? Eu(BA) 3 (phen)]/PMMA composite nanobelts. This new type of magnetic and color-tunable bifunctional coaxial nanobelt has the potential to be applied in novel nano-biolabel materials, drug delivery materials, and future nanodevices owing to their excellent magnetic-fluorescent properties, flexibility, and insolubility.

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Effect of polymer nanofibers thermoelasticity on deformable fluid-saturated porous membrane

Cited by 18 publications

References 31 publications

Giving Direction to Motion and Surface with Ultra‐Fast Speed Using Oriented Hydrogel Fibers

Giving Direction to Motion and Surface with Ultra‐Fast Speed Using Oriented Hydrogel Fibers

Self‐Rolled Porous Hollow Tubes Made up of Biodegradable Polymers

Facile electrospinning construction and characteristics of coaxial nanobelts with simultaneously tunable magnetism and color-tuned photoluminescence bifunctionality

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