Structural insights into semicrystalline states of electrospun nanofibers: a multiscale analytical approach

Maurya, Anjani K.; Weidenbacher, Lukas; Spano, Fabrizio; Fortunato, Giuseppino; Frenz, Martin; Dommann, Alex; Neels, Antonia; Sadeghpour, Amin

doi:10.1039/c9nr00446g

Cited by 25 publications

(38 citation statements)

References 60 publications

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“…On the contrary, the flatter the curve, the higher the degree of alignment. As a further proof, the similarity between the curves corresponding to the membranes collected at 1000 and 1500 rpm confirm what has been reported in [69], where the analysis of SEM-micrographs as well as Small Angle X-ray scattering (SAXS) have shown that these two membranes have a comparable degree of alignment. Interestingly however, we show here that although the membrane collected at 1000 rpm displays an anisotropic behavior that is similar to that of the membrane collected at 1500 rpm (see the similar trends of the corresponding curves in Fig.…”

Section: Correlations Between the π L (ρ φ)-Images And The Membranessupporting

confidence: 88%

“…The membranes consisting of nanofibers in this study were produced by electrospinning technique, using a custom-built device: the production and characterization of these membranes are thoroughly described in [69]. In brief, pellets of PVDFhfp of molecular weight of ∼ 400000 g.mol −1 were dissolved in a concentration of 35 % w/v in dimethylfomamide (DMF).…”

Section: Probed Samples: Electrospun Pvdfhfp Membranes With Varying Dmentioning

confidence: 99%

“…Producing membranes with different degrees of alignment of the nanofibers was made possible by operating the rotating drum at different speeds. It was demonstrated, by performing a spatial correlation analysis on scanning electron microscope (SEM) micrographs and Small Angle X-ray scattering (SAXS), that increasing the rotation speed of the collector drum also increased the degree of alignment in the membranes, i.e., reduced the misalignment between the nanofibers [69]. The SEM micrographs were also used to evaluate the average nanofiber diameter in all membranes.…”

Section: Probed Samples: Electrospun Pvdfhfp Membranes With Varying Dmentioning

confidence: 99%

“…1. The degree of alignment in the membranes collected at 1000, 1500, and 2000 was quantified in [69]: whereas there is clear reduction in the misalignment of the nanofibers when increasing the rotation speed from 1000 to 2000 rpm, the misalignment does not change significantly between 1000 and 1500 rpm. Furthermore, on the photograph in Fig.…”

Section: Probed Samples: Electrospun Pvdfhfp Membranes With Varying Dmentioning

confidence: 99%

“…We begin our investigation by identifying the polarimetric parameters that differ between the non-aligned membrane, where the nanofiber orientation is random, and the membrane collected at 2100 rpm, whose nanofibers display a high degree of alignment [69]. Figure 4 show the PEPs-images recorded at a single point r i=1 from the non-aligned membrane (a) and the membrane collected at 2100 rpm (b) for three pairs of orthogonal polarization states of the probing beam (columns): [37,82,83]).…”

Section: Manifestation Of Anisotropy and Birefringence In The Pepsmentioning

confidence: 99%

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Polarimetric imaging in backscattering for the structural characterization of strongly scattering birefringent fibrous media

et al. 2020

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Interpreting the polarimetric data from fiber-like macromolecules constitutive of tissue can be difficult due to strong scattering. In this study, we probed the superficial layers of fibrous tissue models (membranes consisting of nanofibers) displaying varying degrees of alignment. To better understand the manifestation of membranes' degree of alignment in polarimetry, we analyzed the spatial variations of the backscattered light's Stokes vectors as a function of the orientation of the probing beam's linear polarization. The degree of linear polarization reflects the uniaxially birefringent behavior of the membranes. The rotational (a-)symmetry of the backscattered light's degree of linear polarization provides a measure of the membranes' degree of alignment.

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Section: Correlations Between the π L (ρ φ)-Images And The Membranessupporting

confidence: 88%

Section: Probed Samples: Electrospun Pvdfhfp Membranes With Varying Dmentioning

confidence: 99%

Section: Probed Samples: Electrospun Pvdfhfp Membranes With Varying Dmentioning

confidence: 99%

Section: Probed Samples: Electrospun Pvdfhfp Membranes With Varying Dmentioning

confidence: 99%

Section: Manifestation Of Anisotropy and Birefringence In The Pepsmentioning

confidence: 99%

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Polarimetric imaging in backscattering for the structural characterization of strongly scattering birefringent fibrous media

et al. 2020

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Advanced Functional Hybrid Proton Exchange Membranes Robust and Conductive at 120 °C

Richard

Haidar

Alzamora

et al. 2022

Adv Materials Inter

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Proton‐exchange membrane fuel cell vehicles offer a low‐carbon alternative to traditional oil fuel vehicles, but their performances still need improvement to be competitive. Raising their operating temperature to 120 °C will enhance their efficiency but is currently unfeasible due to the poor mechanical properties at high temperatures of the state‐of‐the‐art proton‐exchange membranes consisting of perfluorosulfonic acid (PFSA) ionomers. To address this issue, xx designed composite membranes made of two networks: a mat of hybrid fibers to maintain the mechanical properties filled with a matrix of PFSA‐based ionomer to ensure the proton conductivity. The hybrid fibers obtained by electrospinning are composed of intermixed domains of sulfonated silica and a fluorinated polymer. The inter‐fiber porosity is then filled with a PFSA ionomer to obtain dense composite membranes with a controlled fibers‐to‐ionomer ratio. At 80 °C, these obtained composite membranes show comparable performances to a pure PFSA commercial membrane. At 120 °C however, the tensile strength of the PFSA membrane drastically drop down to 0.2 MPa, while it is maintained at 7.0 MPa for the composite membrane. In addition, the composite membrane shows a good conductivity of up to 0.1 S cm−1 at 120 °C/90% RH, which increases with the ionomer content.

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Interfacial Engineering of PVDF‐TrFE toward Higher Piezoelectric, Ferroelectric, and Dielectric Performance for Sensing and Energy Harvesting Applications

Abdolmaleki

Haugen

Buhl³

et al. 2023

Advanced Science

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The electrical properties of pristine fluoropolymers are inferior due to their low polar crystalline phase content and rigid dipoles that tend to retain their fixed moment and orientation. Several strategies such as electrospinning, electrohydrodynamic pulling, and template-assisted growing have been proven to enhance the electrical properties of fluoropolymers, however, these techniques are mostly very hard to scale-up and expensive. Here, we propose a facile interfacial engineering approach based on amine-functionalized graphene oxide (AGO) to manipulate the intermolecular interactions in poly (vinylidenefluoride-trifluoroethylene) (PVDF-TrFE) to induce β-phase formation, enlarge the lamellae dimensions, and align the micro-dipoles. The coexistence of primary amine and hydroxyl groups on AGO nanosheets offers strong hydrogen bonding with fluorine atoms, which facilitates domain alignment, resulting in an exceptional remnant polarization of 11.3 µC cm -2 . PVDF-TrFE films with 0.1 wt% AGO demonstrated voltage coefficient, energy density, and energy-harvesting figure of merit values of 0.30 Vm N -1 , 4.75 J cm -3 , and 14 pm 3 J -1 , respectively, making it outstanding compared with state-of-the-art ceramic-free ferroelectric films. We believe this work can open-up new insights towards structural and morphological tailoring of fluoropolymers to enhance their electrical and electromechanical performance and pave the way for their industrial deployment in next-generation wearables and human-machine interfaces.

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Structural insights into semicrystalline states of electrospun nanofibers: a multiscale analytical approach

Abstract: For potential applications in the biomedical domain, we report a comprehensive roadmap towards structural hierarchy and anisotropy in electrospun fibers based on scattering and diffraction studies.

Cited by 25 publications

References 60 publications

Polarimetric imaging in backscattering for the structural characterization of strongly scattering birefringent fibrous media

Polarimetric imaging in backscattering for the structural characterization of strongly scattering birefringent fibrous media

Advanced Functional Hybrid Proton Exchange Membranes Robust and Conductive at 120 °C

Interfacial Engineering of PVDF‐TrFE toward Higher Piezoelectric, Ferroelectric, and Dielectric Performance for Sensing and Energy Harvesting Applications

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