Highly sticky surfaces made by electrospun polymer nanofibers

Varagnolo, Silvia; Raccanello, F.; Mistura, Giampaolo; Moffa, Maria; Persano, Luana; Pisignano, Dario

doi:10.1039/c6ra24922a

Cited by 22 publications

(15 citation statements)

References 49 publications

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“…There were also no statistically significant differences in the laser‐ablated microscale grooves (5‐μm depth and 10‐μm width) among all groups of hierarchically patterned fibrous scaffolds obtained through the advantage of laser processing. It is widely believed that wettability is greatly influenced by the surface energy, and different spatial structures of fibers have been reported to show a great influence on the wetting behavior of materials . The femtosecond laser ablation did not affect the wettability of the resulting hierarchically patterned fibrous scaffolds in either the Align or Random groups.…”

Section: Discussioncontrasting

confidence: 39%

Effect of spatial arrangement and structure of hierarchically patterned fibrous scaffolds generated by a femtosecond laser on cardiomyoblast behavior

Jun

Kim

Chung

et al. 2018

J Biomedical Materials Res

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Biological responses on biomaterials occur either on their surface or at the interface. Therefore, surface characterization is an essential step in the fabrication of ideal biomaterials for achieving effective control of the interaction between the material surface and the biological environment. Herein, we applied femtosecond laser ablation on electrospun fibrous scaffolds to fabricate various hierarchical patterns with a focus on the alignment of cells. We investigated the simultaneously stimulated response of cardiomyoblasts based on multiple topographical cues, including scales, oriented directions, and spatial arrangements, in the fibrous scaffolds. Our results demonstrated a synergistic effect on cell behaviors of one or more structural arrangements in a homogeneous orientation, whereas antagonistic effects were observed for cells arranged on a surface with heterogeneous directions. Taken together, these results indicate that our hierarchically patterned fibrous scaffolds may be useful tools for understanding the cellular behavior on fibrous scaffolds used to mimic an extracellular matrix-like environment. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 1732-1742, 2018.

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Section: Discussioncontrasting

confidence: 39%

Effect of spatial arrangement and structure of hierarchically patterned fibrous scaffolds generated by a femtosecond laser on cardiomyoblast behavior

Jun

Kim

Chung

et al. 2018

J Biomedical Materials Res

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“…The air that is captured between nanostructured surfaces with designed roughness is minimizing the surface energy so wetting contact angles [6]. Electrospun three-dimensional (3D) meshes, characterized by large surface area to volume or mass ratio, have a range of applications where wetting and surface properties [7] are particularly important, such as filtration [8,9,10], membranes [11,12,13], structured composites [14,15], optical sensing [16], water [17,18,19], energy harvesting [20], drug delivery [21], and tissue engineering [22,23]. Wettability of tissue scaffolds plays an important role in the adsorption of proteins [24] and cell culture [25,26].…”

Section: Introductionmentioning

confidence: 99%

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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“…On the other hand, a (super)hydrophilic membrane is beneficial for a whole range of other applications in which a water‐rich stream has to pass through the membrane structure with a low pressure drop and high flux, such as particle‐size‐based separation or photocatalytic degradation of organic micropollutants . This behavior is dependent on a subtle balance between the surface chemistry and the morphology of the membrane structure, such as pore size, pore size distribution, and surface roughness, and can be tuned by various functionalization strategies …”

Section: Introductionmentioning

confidence: 99%

Silica Nanofibrous Membranes for the Separation of Heterogeneous Azeotropes

Loccufier

Geltmeyer

Daelemans

et al. 2018

Adv Funct Materials

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Nanofibrous materials produced through electrospinning are characterized by a high porosity, large specific surface area, and high pore interconnectivity and, therefore, show potential for, e.g., separation and filtration. The development of more inert nanofibers with higher thermal and chemical resistance extends the application field to high-end purification. Silica nanofibrous membranes produced by direct electrospinning of a sol-gel solution without a sacrificing carrier, starting from tetraethoxysilane, meet these challenging requirements. After electrospinning the membrane is highly hydrophobic. Storage under dry conditions preserves this property. Oppositely, a superhydrophilic membrane is obtained by storage under high humidity (month scale). This switch is caused by the reaction of ethoxy groups, present due to incomplete hydrolysis of the precursor, with moisture in the air, resulting in an increased amount of silanol groups. This transition can be accelerated to hour scale by applying a heat treatment, with the additional increase in cross-linking density for temperatures above 400 °C, enabling applications that make use of hydrophobic and hydrophilic membranes by tuning the functionalization. It is showcased that upon designing the water repellent or absorbing nature of the silica material, fast gravity-driven membrane separation of heterogeneous azeotropes can be achieved.

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Highly sticky surfaces made by electrospun polymer nanofibers

Abstract: We report on a comprehensive study of the unique adhesive properties of mats of polymethylmethacrylate (PMMA) nanofibers produced by electrospinning.

Cited by 22 publications

References 49 publications

Effect of spatial arrangement and structure of hierarchically patterned fibrous scaffolds generated by a femtosecond laser on cardiomyoblast behavior

Effect of spatial arrangement and structure of hierarchically patterned fibrous scaffolds generated by a femtosecond laser on cardiomyoblast behavior

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

Silica Nanofibrous Membranes for the Separation of Heterogeneous Azeotropes

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