Rubbery nanofibers by co-electrospinning of almost immiscible NBR and PCL blends

Maccaferri, Emanuele; Mazzocchetti, Laura; Benelli, Tiziana; Brugo, Tommaso Maria; Zucchelli, Andrea; Giorgini, Loris

doi:10.1016/j.matdes.2019.108210

Cited by 33 publications

(55 citation statements)

References 43 publications

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“…In particular, the mechanical behavior is characterized by three main stages: an initial nonlinear trend (Stage I), followed by a linear one (Stage II), and finally an additional nonlinear behavior where the stress reaches a maximum value before mat failure (Stage III). To better understand the phenomena, the Authors developed, and already successfully applied, [ 20,40 ] a data fitting model. The calculated stress ( σ ) can be expressed as the superimposition of two stress contributions: a linear one ( σ 1 ) and a nonlinear one ( σ 2 ), formulated as in the following equation:

\begin{matrix} true \\ right σ ((), ε) = σ_{1} ((), ε) - σ_{2} ((), ε) = ((), a ε + b) - ((), b e^{- c ε}) = a ε + b ((), 1 - e^{- c ε}) \end{matrix}

where a , b and c are parameters experimentally determined to obtain the data fitting.…”

Section: Resultsmentioning

confidence: 99%

“…More specifically, 1/ c represents the onset extrapolation of the slope change ( ε knee ), as can be derived from Equations () and () reported in ref. [40]. Ny150 and Ny400 have a similar average c (48 and 46, respectively) which corresponds to ε knee = 0.0021, while Ny250 has c = 36 and consequently a higher ε knee (0.0028).…”

Section: Resultsmentioning

confidence: 99%

“…Tensile specimens were prepared anchoring the membrane to a paper frame for better handling and avoiding any nanofibers slippage in the machine fixtures, cutting the frame before the test started, as reported before. [20,40] Specimens dimensions are reported in Table 2. For each membrane type (Ny150, Ny250, and Ny400) two mats were electrospun, one with a deposition time twice as long as the other (called dt and 2dt).…”

Section: Characterization Of Nanofibrous Mats and Grammage/thickness Evaluationmentioning

confidence: 99%

See 2 more Smart Citations

How Nanofibers Carry the Load: Toward a Universal and Reliable Approach for Tensile Testing of Polymeric Nanofibrous Membranes

Maccaferri

Cocchi

Mazzocchetti

et al. 2021

Macro Materials & Eng

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Nanofibrous nonwovens show high versatility and outstanding properties, with reduced weight. Porous morphology, high material flexibility and deformability challenge their mechanical testing, severely affecting results reliability. Still today, a specific technical standard method to carry out tensile testing of nonwoven nanofibrous mats is lacking, as well as studies concerning tensile test data reliability. In this work, an accurate, systematic, and critical study is presented concerning tensile testing of nonwovens, using electrospun Nylon 66 random nanofibrous mats as a case study. Nanofibers diameter and specimen geometry are investigated to thoroughly describe the nanomat tensile behavior, also considering the polymer thermal properties, and the nanofibers crossings number as a function of the nanofibers diameter. Below a threshold value, which lies between 150 and 250 nm, the overall mat mechanical behavior changes from ductile to brittle, showing enhanced elastic modulus for a high number of nanofibers crossings. While specimen geometry does not affect tensile results. Stress–strain data are analyzed using a phenomenological data fitting model to better interpret the tensile behavior. The experimental results demonstrate the high reliability of the proposed mass‐based load normalization, providing a simple, effective, and universally suitable method for obtaining high reproducible tensile stress–strain curves.

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\begin{matrix} true \\ right σ ((), ε) = σ_{1} ((), ε) - σ_{2} ((), ε) = ((), a ε + b) - ((), b e^{- c ε}) = a ε + b ((), 1 - e^{- c ε}) \end{matrix}

where a , b and c are parameters experimentally determined to obtain the data fitting.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Characterization Of Nanofibrous Mats and Grammage/thickness Evaluationmentioning

confidence: 99%

See 1 more Smart Citation

How Nanofibers Carry the Load: Toward a Universal and Reliable Approach for Tensile Testing of Polymeric Nanofibrous Membranes

Maccaferri

Cocchi

Mazzocchetti

et al. 2021

Macro Materials & Eng

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“…The intersection of the two lines allows to calculate the knee point that is defined as the transition point from the initial non-linearity to the asymptotic linearity of Z-Model. As it was previously demonstrated (Maccaferri et al, 2020), the point of intersection between the two lines gives the strain at knee of the Z-Model:…”

Section: Mechanical Modelingmentioning

confidence: 87%

Biomimetic Hierarchically Arranged Nanofibrous Structures Resembling the Architecture and the Passive Mechanical Properties of Skeletal Muscles: A Step Forward Toward Artificial Muscle

Gotti

Sensini

Fornaia

et al. 2020

Front. Bioeng. Biotechnol.

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“…In the literature, different fiber thicknesses and morphological properties have been obtained in the PCL electron spinning method using different solvent systems test parameters (Maccaferri et al, 2020). In the PCL electron spinning technique, five different test parameters were used, and the solvent system, polymer concentration, and flow rate were kept constant (Table S1).…”

Section: Resultsmentioning

confidence: 99%

Zero‐valent iron nanoparticles containing nanofiber scaffolds for nerve tissue engineering

Sezer

Yavuz

Ors

et al. 2020

J Tissue Eng Regen Med

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Regeneration of nerve tissue is a challenging issue in regenerative medicine. Especially, the peripheral nerve defects related to the accidents are one of the leading health problems. For large degeneration of peripheral nerve, nerve grafts are used in order to obtain a connection. These grafts should be biodegradable to prevent second surgical intervention. In order to make more effective nerve tissue engineering materials, nanotechnological improvements were used. Especially, the addition of electrically conductive and biocompatible metallic particles and carbon structures has essential roles in the stimulation of nerves. However, the metabolizing of these structures remains to wonder because of their nondegradable nature. In this study, biodegradable and conductive nerve tissue engineering materials containing zero‐valent iron (Fe) nanoparticles were developed and investigated under in vitro conditions. By using electrospinning technique, fibrous mats composed of electrospun poly(ε‐caprolactone) (PCL) nanofibers and Fe nanoparticles were obtained. Both electrical conductivity and mechanical properties increased compared with control group that does not contain nanoparticles. Conductivity of PCL/Fe5 and PCL/Fe10 increased to 0.0041 and 0.0152 from 0.0013 Scm−1, respectively. Cytotoxicity results indicated toxicity for composite mat containing 20% Fe nanoparticles (PCL/Fe20). SH‐SY5Y cells were grown on PCL/Fe10 best, which contains 10% Fe nanoparticles. Beta III tubulin staining of dorsal root ganglion neurons seeded on mats revealed higher cell number on PCL/Fe10. This study demonstrated the impact of zero‐valent Fe nanoparticles on nerve regeneration. The results showed the efficacy of the conductive nanoparticles, and the amount in the composition has essential roles in the promotion of the neurites.

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Rubbery nanofibers by co-electrospinning of almost immiscible NBR and PCL blends

Cited by 33 publications

References 43 publications

How Nanofibers Carry the Load: Toward a Universal and Reliable Approach for Tensile Testing of Polymeric Nanofibrous Membranes

How Nanofibers Carry the Load: Toward a Universal and Reliable Approach for Tensile Testing of Polymeric Nanofibrous Membranes

Biomimetic Hierarchically Arranged Nanofibrous Structures Resembling the Architecture and the Passive Mechanical Properties of Skeletal Muscles: A Step Forward Toward Artificial Muscle

Zero‐valent iron nanoparticles containing nanofiber scaffolds for nerve tissue engineering

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