Hydrophobicity of fluorocarbon-finished electrospun poly (acrylonitrile) nanofibrous webs

Sadeghi, Parvaneh; Tavanai, Hossein; Khoddamı, Akbar

doi:10.1080/00405000.2016.1160812

Cited by 5 publications

(5 citation statements)

References 26 publications

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“…We found that it was very important how the geometry of electrospun surfaces was validated. The commonly used fiber diameter was not necessarily a convincing parameter unless it was correlated with surface roughness [7,46,50,51,69]. Another important parameter that should be included in the roughness analysis of electrospun surfaces was a fraction of fibers that was strictly correlated with changes of surface free energies of 3D meshes, which was reduced by the air trapped between fibers.…”

Section: Discussionmentioning

confidence: 99%

“…Previously, many studies have shown the effect of increased contact angles, most often for water, for the decreased fiber diameter [7,46], however, the smallest fibers were often with beads and the variations of contact angles were smaller than 10° for the sizes from 0.6 to 2.2 µm [46] and between 3.5 to 8 µm another 10° [7]. Other studies actually showed the opposite, so an increase of contact angle with fibers diameter [50] or no correlation at all with D f [51]. Based on the above-mentioned studies, we tried to identify the range of fiber diameter that should not influence wetting contact angle, so we could focus in our investigation on roughness and fraction of fibers effect on wetting of polymer meshes.…”

Section: Introductionmentioning

confidence: 99%

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Roughness and Fiber Fraction Dominated Wetting of Electrospun Fiber-Based Porous Meshes

et al. 2018

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Wettability of electrospun fibers is one of the key parameters in the biomedical and filtration industry. Within this comprehensive study of contact angles on three-dimensional (3D) meshes made of electrospun fibers and films, from seven types of polymers, we clearly indicated the importance of roughness analysis. Surface chemistry was analyzed with X-ray photoelectron microscopy (XPS) and it showed no significant difference between fibers and films, confirming that the hydrophobic properties of the surfaces can be enhanced by just roughness without any chemical treatment. The surface geometry was determining factor in wetting contact angle analysis on electrospun meshes. We noted that it was very important how the geometry of electrospun surfaces was validated. The commonly used fiber diameter was not necessarily a convincing parameter unless it was correlated with the surface roughness or fraction of fibers or pores. Importantly, this study provides the guidelines to verify the surface free energy decrease with the fiber fraction for the meshes, to validate the changes in wetting contact angles. Eventually, the analysis suggested that meshes could maintain the entrapped air between fibers, decreasing surface free energies for polymers, which increased the contact angle for liquids with surface tension above the critical Wenzel level to maintain the Cassie-Baxter regime for hydrophobic surfaces.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Roughness and Fiber Fraction Dominated Wetting of Electrospun Fiber-Based Porous Meshes

et al. 2018

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“…A possible explanation is that the electrospun matrix’s wettability is influenced not only by polymer type but also by fibre distribution and their diameter. In the literature, as reported by Sadeghi P. and coworkers, an increase in contact angle values was related to greater fibre diameter [ 53 ]. If the average fibre diameters ± standard deviation of ES2 (1.085 ± 0.360 μm) and ES3 (1.076 ± 0.537 μm) samples were compared, a slight increase in fibre size for less wettable ES3 was reported.…”

Section: Discussionmentioning

confidence: 88%

Investigation on Electrospun and Solvent-Casted PCL-PLGA Blends Scaffolds Embedded with Induced Pluripotent Stem Cells for Tissue Engineering

Rosalia,

Giacomini,

Tottoli

et al. 2023

Pharmaceutics

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The design, production, and characterisation of tissue-engineered scaffolds made of polylactic-co-glycolic acid (PLGA), polycaprolactone (PCL) and their blends obtained through electrospinning (ES) or solvent casting/particulate leaching (SC) manufacturing techniques are presented here. The polymer blend composition was chosen to always obtain a prevalence of one of the two polymers, in order to investigate the contribution of the less concentrated polymer on the scaffolds’ properties. Physical–chemical characterization of ES scaffolds demonstrated that tailoring of fibre diameter and Young modulus (YM) was possible by controlling PCL concentration in PLGA-based blends, increasing the fibre diameter from 0.6 to 1.0 µm and reducing the YM from about 22 to 9 MPa. SC scaffolds showed a “bubble-like” topography, caused by the porogen spherical particles, which is responsible for decreasing the contact angles from about 110° in ES scaffolds to about 74° in SC specimens. Nevertheless, due to phase separation within the blend, solvent-casted samples displayed less reproducible properties. Furthermore, ES samples were characterised by 10-fold higher water uptake than SC scaffolds. The scaffolds suitability as iPSCs culturing support was evaluated using XTT assay, and pluripotency and integrin gene expression were investigated using RT-PCR and RT-qPCR. Thanks to their higher wettability and appropriate YM, SC scaffolds seemed to be superior in ensuring high cell viability over 5 days, whereas the ability to maintain iPSCs pluripotency status was found to be similar for ES and SC scaffolds.

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“…Some of the previous studies in the field [ 82 , 83 ] have shown that small diameters of fibers will determine high values for their contact angles, while others [ 83 ] have demonstrated the opposite effect, namely an increase in the contact angle with fiber diameters. As can be seen from the SEM images ( Figure 6 ), in our case, for the fibrous membranes obtained from the polymer solutions in DMF (PSFQ and CAP), the contact angle values are slightly lower compared to those corresponding to the membrane obtained from the PVDF solution in NMP, which means that they are slightly hydrophilic, and the diameter of the fibers differs insignificantly.…”

Section: Resultsmentioning

confidence: 99%

Electrospun Membranes Based on Quaternized Polysulfones: Rheological Properties–Electrospinning Mechanisms Relationship

Filimon,

Serbezeanu,

Dobos

et al. 2024

Polymers

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Composite membranes based on a polymer mixture solution of quaternized polysulfone (PSFQ), cellulose acetate phthalate (CAP), and polyvinylidene fluoride (PVDF) for biomedical applications were successfully obtained through the electrospinning technique. To ensure the polysulfone membranes’ functionality in targeted applications, the selection of electrospinning conditions was essential. Moreover, understanding the geometric characteristics and morphology of fibrous membranes is crucial in designing them to meet the performance standards necessary for future biomedical applications. Thus, the viscosity of the solutions used in the electrospinning process was determined, and the morphology of the electrospun membranes was examined using scanning electron microscopy (SEM). Investigations on the surfaces of electrospun membranes based on water vapor sorption data have demonstrated that their surface properties dictate their biological ability more than their specific surfaces. Furthermore, in order to understand the different macromolecular rearrangements of membrane structures caused by physical interactions between the polymeric chains as well as by the orientation of functional groups during the electrospinning process, Fourier transform infrared (FTIR) spectroscopy was used. The applicability of composite membranes in the biomedical field was established by bacterial adhesion testing on the surface of electrospun membranes using Escherichia coli and Staphylococcus aureus microorganisms. The biological experiments conducted establish a foundation for future applications of these membranes and validate their effectiveness in specific fields.

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Hydrophobicity of fluorocarbon-finished electrospun poly (acrylonitrile) nanofibrous webs

Cited by 5 publications

References 26 publications

Roughness and Fiber Fraction Dominated Wetting of Electrospun Fiber-Based Porous Meshes

Roughness and Fiber Fraction Dominated Wetting of Electrospun Fiber-Based Porous Meshes

Investigation on Electrospun and Solvent-Casted PCL-PLGA Blends Scaffolds Embedded with Induced Pluripotent Stem Cells for Tissue Engineering

Electrospun Membranes Based on Quaternized Polysulfones: Rheological Properties–Electrospinning Mechanisms Relationship

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