As-prepared Nanofibers Research Articles

Towards scarless repair: MMP-2 responsive drug releasing nanofibrous mat restores homeostasis via fibroblasts’ activation

The failure of wound repair, particularly in cases of refractory wounds, is closely associated with immune disorders, leading to serious consequences such as scarring and ulcers. To address this issue, Poly [octanediol-co- (citric acid)] (POCA)/gelatin curcumin-loaded nanofibrous mats responsive to inflammatory microenvironments are developed. POCA serves as a cross-linker for gelatin, providing the nanofibrous mat with skin-like J-shaped stress-strain behavior. Moreover, the pendant carboxyl groups of POCA enable adhesion ability in the wet state, thereby increasing wound sealing. Most importantly, the as-prepared nanofibers are sensitive to MMP-2. Amorphous curcumin is responsively released in response to high MMP levels present in inflammatory wounds. This significantly enhances curcumin's efficiency. The mat exhibits substantial therapeutic effects on chronic diabetic wounds and tension-loaded wounds, nudging wound healing toward regenerative repair. Moreover, it was also shown to promote basement membrane renewal by activating wound fibroblasts, which mitigates the immune response and reinstate homeostasis.

Fabrication of gallic acid containing poly(vinyl alcohol)/chitosan electrospun nanofibers with antioxidant and drug delivery properties

Chitosan-based nanofibers with excellent properties are attractive materials for specific industrial applications of contemporary interest. This work aims to fabricate functional nanofibers based on poly(vinyl alcohol)/chitosan (CS) with an antioxidant and model drug molecule, gallic acid (GA), by electrospinning, followed by cross-linking through glutaraldehyde (PVA-CS-GAs). PVA-CS-GAs were electrospun at two different concentrations by the adjustment of the CS feeding ratio. The detailed characteristics of the as-prepared electrospun nanofibers were elucidated by Fourier Transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), water contact angle (WCA) measurements, thermogravimetric and differential scanning calorimetry (TGA and DSC) analyses. SEM images indicated that the average fiber diameter distribution was in the range of 90–110 nm. The results show that morphology, mean diameter, wettability, and thermal characteristics of the composite nanofibers were affected by the CS feeding ratio. Although the increase in the amount of polar -OH groups with the addition of GA caused an improvement in the hydrophilicity and thermal stability of the electrospun nanofibers, it also caused a decrease in the thermal transition temperatures. Furthermore, antioxidant tests based on DPPH radical scavenging ability and in vitro release studies demonstrated that the cross-linked PVA-CS-GA composite nanofibers have good antioxidant activity and a pH-dependent drug release rate, indicating their potential for implementation in wound healing and drug delivery applications.

Ionic liquid reinforced cellulose nanofiber with iron oxide electrocatalyst

Increased attention has been focused on the preparation of nanoarchitectures for applicability in energy, environmental and biological streams. However, concerns have been raised regarding environmental effects due to the harsh chemicals used in such preparations. To overcome this issue, the present study reports the use of a green solvent, 1-methyl-3-propyl-1H-imidazol-3-ium iodide or [Pmim]I, for the preparation of cellulose nanofiber-iron oxide (CNF-Fe2O3) composite. The as-prepared nanofiber composite is characterized with the aid of analytical tools such as X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, field-emission scanning electron microscopy/energy dispersive X-ray spectroscopy (FE-SEM/EDX), and X-ray photoelectron spectroscopy (XPS). As a proof-of-concept demonstration, the resulting nanostructure is employed as an electrocatalyst and is compared with the bare CNFs, non-cellulose NFs and a standard RuO2 catalyst. The results indicate that the CNF-Fe2O3 composite achieves a standard current density (j) of 10 mA cm−2 at only 260 mV compared to 280, 290, and 370 mV for the standard RuO2, the bare CNFs, and non-cellulose nanofibers (NFs), respectively. These differences become more prominent at a high current density of 100 mA cm−2, where the CNF-Fe2O3 requires only 310 mV, while the CNFs, RuO2, and NFs consume 360, 370, and 550 mV, respectively.

Unique Core-Shell Structured Polyaniline Nanofibers Toward Ultrahigh-Rate Flexible All-Solid-State Supercapacitor.

Promoting charge storage and fast charging capability simultaneously is a long-standing challenge for supercapacitors. A facile flowing seed polymerization is adopted to prepare polyaniline (PANI) nanofibers, in which phytic acid (PA) doped oligomers are first produced as the seeds for promoting the highly oriented growth of PANI nanofibers accompanying with the copolymerization of m-aminobenzene sulfonic acid (ASA) and aniline occurred on the surface of PANI nanofibers, as a result, unique core-shell structured PANI nanofibers are continuously fabricated. Benefitting from compact nanofiber structure, excellent dispersion, and self-doping effect, as-prepared PANI nanofibers exhibit a specific capacitance of 671.2 F g-1 at 2 A g-1 and ultrahigh rate capability of 93.1% from 2 to 100 A g-1. Then assembled all-solid-state supercapacitor can deliver the highest energy density of 28.3Wh kg-1 at a power density of 320.2W kg-1 with remarkable rate capability (81.2% from 1 to 20 A g-1), cycle stability (77.5% after 5000 cycles) as well as light weight and flexibility. It is highly desirable that the present green and scalable approach can be further applied to fabricate other unique core-shell structured PANI nanofibers with appealing potentials in energy storage devices.

Kinetically Controlled Self-Assembly of Ag Nanoclusters with Enhanced Luminescence.

Constructing self-assembly with definite assembly structure-property correlation is of great significance for expanding the property richness and functional diversity of metal nanoclusters (NCs). Herein, a well-designed liquid reaction strategy was developed through which a highly ordered nanofiber superstructure with enhanced green photoluminescence (PL) was obtained via self-assembly of the individual silver nanoclusters (Ag NCs). By visual monitoring of the kinetic reaction process using time-dependent and in situ spectroscopy measurements, the assembling structure growth and the structure-determined luminescence mechanisms were revealed. The as-prepared nanofibers featured a series of advantages involving a high emission efficiency, large Stokes shift, homogeneous chromophore, excellent photostability, high temperature, and pH sensibility. By virtue of these merits, they were successfully employed in various fields of luminescent inks, encryption and anticounterfeiting platforms, and optoelectronic light-emitting diode (LED) devices.

Optimization of Biologically Inspired Electrospun Scaffold for Effective Use in Bone Regenerative Applications.

Human bone is composed of organic and inorganic composite materials, contributing to its unique strength and flexibility. Hydroxyapatite (HAP) has been extensively studied for bone regeneration, due to its excellent bioactivity and osteoconductivity, which makes it a highly valuable biomaterial for tissue engineering applications. For better therapeutic effects, composite nanofibers containing polyvinyl alcohol (PVA) and polyvinyl Pyrrolidone (PVP) were developed using an electrospinning technique in this study. Herein, hydroxyapatite (a major inorganic constituent of native bone) concentrations varying from 5 to 25% were reinforced in the composite, which could alter the properties of nanofibers. The as-prepared composite nanofibers were characterized by SEM, TEM, XRD, and FT-IR spectroscopy, and a bioactivity assessment was performed in simulated body fluid (SBF). The ICP-OES analysis was used to determine the concentration of Ca2+ and PO42- ions before and after SBF immersion. To optimize the material selection, the nanofibrous scaffolds were subjected to cell proliferation and differentiation in MG-63 osteoblast cell lines, but no significant toxicity was observed. In conclusion, HAP-PVA-PVP scaffolds exhibit unique physical and chemical properties and ideal biocompatibility, with great promise to serve as effective candidates for bone tissue applications.

On the Dendrite-Suppressing Effect of Laser-Processed Polylactic Acid-Derived Carbon Coated Zinc Anode in Aqueous Zinc Ion Batteries.

A major bottleneck limiting the commercialization of aqueous zinc ion batteries (AZIBs) is dendrite formation on the zinc (Zn) anode during the plating/stripping process, which leads to rapid deterioration in performance and, consequently to the device failure. In this regard, researchers are trying to design more stable anodes toward suppressing dendrite formation. One possible solution to tackle this problem and to extend the cycling life of AZIBs is to modify the zinc anode surface by coating carbonaceous materials, enabling more controlled charge flux and uniform ion distribution. This work reports sustainable and bio-derived polylactic acid (PLA) as a coating layer on the zinc anode. Carbonizing this polymer under ambient conditions using a high-power nanosecond laser forms a carbon-coated zinc foil, which was directly utilized as the anode in aqueous zinc ion batteries. The fabricated laser-processed PLA-derived carbon-coated zinc anode demonstrated an extended cycling life of almost 1600 hours, significantly outperforming the bare zinc anode. A full aqueous zinc ion battery assembled from as-modified anode and as-prepared V2O5 nanofibers as cathode was able to deliver a specific capacity of 238 mAh g-1 at 1.0 A g-1 with a capacity retention of 70 % after 1000 cycles.

Research upon Cu-Doping Contents in TiO2 Nanoparticles Incorporated onto Cellulose Nanofibers for Dye Removal and Self-Cleaning Applications.

Cu-doping contents in the TiO2 lattice structure were studied to show the effects on the crystal structure, morphology, and photocatalytic activity of TiO2 nanoparticles and thus composite cellulosic nanofibrous membranes. Pristine and copper-doped TiO2 nanoparticles were synthesized using the sol-gel technique, a wet chemical method with the advantages of low synthesizing temperature, uniform nanosize distribution, and purity. The as-synthesized semiconductor nanoparticles were first tested with the dye removal process and then impregnated onto electrospun cellulose nanofibers (CL nanofibers) to acquire modified nanofibers with self-cleaning properties. The as-prepared composite CL nanofibers consisting of doped and undoped TiO2 nanoparticles were characterized by various techniques, such as field emission scanning electron microscopy, transmission electron microscopy, UV-vis, X-ray diffraction, Fourier transform infrared spectroscopy, and tensile tests. The copper-doped TiO2 molar ratio in the nanocomposite was found to possess a pronounced impact on the dye removal and self-cleaning effects under the visible light spectrum, whereas TiO2 is highly effective under specific UV-light irradiation. Optical measurements and dye decomposition showed that the Cu-doped TiO2 nanocomposite was optimized at a 1% molar ratio by the copper-doping concentration regarding dye removal and self-cleaning applications under the visible light range.

Nano-scaled polyacrylonitrile for industrialization of nanofibers with photoluminescence and microbicide performance

Nanofibers are investigated to be superiorly applicable in different purposes such as drug delivery systems, air filters, wound dressing, water filters, and tissue engineering. Herein, polyacrylonitrile (PAN) is thermally treated for autocatalytic cyclization, to give optically active PAN-nanopolymer, which is subsequently applicable for preparation of nanofibers through solution blow spinning. Whereas, solution blow spinning is identified as a process for production of nanofibers characterized with high porosity and large surface area from a minimum amounts of polymer solution. The as-prepared nanofibers were shown with excellent photoluminescence and microbicide performance. According to rheological properties, to obtain spinnable PAN-nanopolymer, PAN (12.5–15% wt/vol, honey like solution, 678–834 mPa s), thermal treatment for 2–4 h must be performed, whereas, time prolongation resulted in PAN-nanopolymer gelling or rubbering. Size distribution of PAN-nanopolymer (12.5% wt/vol) is estimated (68.8 ± 22.2 nm), to reflect its compatibility for the production of carbon nanofibers with size distribution of 300–400 nm. Spectral mapping data for the photoluminescent emission showed that, PAN-nanopolymer were exhibited with two intense peaks at 498 nm and 545 nm, to affirm their superiority for production of fluorescent nanofibers. The microbial reduction % was estimated for carbon nanofibers prepared from PAN-nanopolymer (12.5% wt/vol) to be 61.5%, 71.4% and 81.9%, against S. aureus, E. coli and C. albicans, respectively. So, the prepared florescent carbon nanofibers can be potentially applicable in anti-infective therapy.

Fabrication and Characterization of Ni-Carbon nanofibers by Electrospinning Technique

Carbon nanofibers with the distribution of magnetic Ni metal (Ni-CNFs) have been synthesized using Nickel (II) acetate tetrahydrate (Ni (OCHCH3)2.4H2O), polyacrylonitrile (PAN) as precursors by electrospinning technique. The as-prepared nanofibers were dried in a vacuum oven, stabilized, and followed by carbonization at 850 °C in N2 atmosphere. Their structural phase composition, microstructure, and magnetic properties have been investigated. The phase formation of pure Ni-CNF without any impurity has been confirmed by X-ray diffraction (XRD) pattern. The average diameter of the nanofibers and the Ni nanoparticles has been calculated to be 159±25.72 nm and 67±11.24 nm, respectively. Energy-dispersive X-ray spectroscopy (EDX) measurement has been carried out to confirm the presence of Ni and C elements with their weight%. Raman spectrum attributes the presence of two characteristic absorption peaks of carbon materials. Room temperature (300 K) magnetic measurement shows the ferromagnetic behavior of Ni-CNF. These nanofibers have the potential to be used in a wide variety of applications including These materials have wide variety of applications as in different magnetic devices (magnetic sensors, magnetic recording devices, and soft magnetic materials.), microwave absorption materials, supercapacitors and batteries etc.

Zinc ions and ciprofloxacin-encapsulated chitosan/poly(ɛ-caprolactone) composite nanofibers promote wound healing via enhanced antibacterial and immunomodulatory

Antibacterial and anti-inflammatory nanofibrous membranes have attracted extensive attention, especially for the cutaneous wound treatment. In this study, zinc ions and ciprofloxacin-encapsulated chitosan/poly(ɛ-caprolactone) (CS/PCL) electrospun core-shell nanofibers were prepared by employing zinc ions-coordinated chitosan as the shell, and ciprofloxacin-functionalized PCL as the core. The morphology and core-shell structure of the as-prepared composite nanofibers were examined by SEM and TEM, respectively. The physical structure and mechanical property of the electrospun membrane were explored by FTIR, swelling, porosity and tensile test. Tensile strength of the zinc ions-coordinated CS/PCL composite nanofibers was enhanced to ca. 16 MPa. Meanwhile, the composite nanofibers can rapidly release of ciprofloxacin during 11 days and effectively suppress above 98 % of S. aureus proliferation. Moreover, the composite nanofibers exhibited excellent guide cell alignment and cyto-activity, as well as significantly down-regulated the inflammation factors, IL-6 and TNF-α in vitro. Animal experiments in vivo showed that the zinc ions-coordinated CS/PCL membrane by means of the synergistic effect of ciprofloxacin and active zinc ions, could significantly alleviate macrophage infiltration, promote collagen deposition and accelerate the healing process of wounds.

Design and fabrication of TiO2/Nd polyurethane nanofibers based photoreactor: A continuous flow kinetics study for Estriol degradation and mechanism

Novel polyurethane (PU) nanofibers incorporated with the neodymium (Nd) doped TiO2 nanoparticles were fabricated by electrospinning process and employed for the photocatalytic degradation of the estriol (E3) hormone. Nanofibers possessed high porosity (0.47 μm) and uniform mesh-like structure while suitable incorporation of TiO2/Nd nanoparticles with increasing concentrations (5, 10, and 20 %) was obtained. The TiO2/Nd incorporated PU nanofiber photocatalytic activity under UV and visible light was evaluated using a continuous drip flow biofilm reactor. To establish sufficient adherence to the PU matrix necessary to maintain durability during crossflow reactor, the as-prepared nanofibers were thermally pressed on polyethylene terephthalate (PET) sheets to avoid any potential folding. The nanofibers performed better in UV than visible, with maximum degradation rates of ∼90.2 % and 30.4 %, respectively, at pH 7 in 120 min. The degradation performance of nanofibers increased with an increase in the number of layers and decreased with the E3 solution flow rate. The experimental data best fitted for the pseudo-first-order kinetic model with regression coefficient (R2) > 0.9. The highest degradation removal capacities were 2.436 and 0.847 mg/g under UV and visible light irradiation, respectively. The results showed that TiO2/Nd incorporated PU nanofibers exhibit a potential to degrade hormones from environmental water.

Facile fabrication of organic superhydrophobic corn silk-derived cellulose acetate nanofiber for the effective sequestration of oil from oil-water mixture.

Oil spills and subsequent cleanup by oil-water separation remain a global concern. For the first time, corn silk-derived cellulose acetate (CSCA) and polyacrylonitrile (PAN) composite nanofiber are reported to create a superhydrophobic oil-water sequestration membrane. CA : PAN solutions with various PAN concentrations were evaluated for viscosity and conductivity. A CSCA nanofiber membrane was fabricated through electrospinning, which was superhydrophobic and oleophilic in water. Scanning electron microscope, energy-dispersive spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and thermogravimetric analysis/differential scanning calorimetry were used to analyze the membrane's morphological features. CSCA nanofibers formed a highly spherical bead with a maximum contact angle of 156° (>120°) in pure water solutions, demonstrating their superhydrophobicity. This study found that membranes can remove oil from oil-water mixtures and emulsions, as gravity is the only force required for propelling the system. Mineral oil had the highest oil sorption capability (908%), while toluene had the lowest (664%). For mineral oil-water mixtures, the CSCA membrane has the greatest separation flux at a maximum of 442 L/m2/h and the best separation efficiency at up to 99.67%. These findings provide strong support for using an as-prepared CSCA nanofiber membrane as a viable reusable oil sorbent in oil spill cleaning.

The fabrication of mesoporous η-Al2O3 nanofiber with tunable pore size by template-induced strategy

In this work, we prepared mesoporous η-Al2O3 nanofiber with tunable pore size using diverse surfactants. The as-prepared mesoporous η-Al2O3 nanofiber was characterized by a combination of various physicochemical techniques. The influence of surfactants types and polymerization degree on surface morphology and adsorption performance of mesoporous η-Al2O3 nanofiber was compared. The results of transmission electron microscopy (TEM), low-angle X-ray diffraction (XRD) and N2 adsorption–desorption isotherm prove the existence of mesoporous structure in η-Al2O3 nanofiber. Polyethylene glycol (PEG) is favored over polyether (PPG) in the preparation of mesoporous η-Al2O3 nanofiber, and PEG with a lower degree of polymerization is beneficial to form well-defined mesoporous structure. The η-Al2O3 nanofiber (PEG600) has the highest specific surface area and the best adsorption performance, followed by the η-Al2O3 nanofiber (PEG2000), and then the η-Al2O3 nanofiber (PPG). Both the adsorption isotherm and the adsorption kinetics equation prove that the adsorption mechanism of methylene blue on mesoporous η-Al2O3 nanofiber is the combination of chemical and multilayer adsorption. This work provides a new avenue to prepare mesoporous η-Al2O3 nanofiber with tunable pore size for the application of mesoporous material in battery, adsorbent, catalytic and biomedical carrier.

Sn2+ doped NiO hollow nanofibers to improve triethylamine sensing characteristics through tuning oxygen defects

The triethylamine (TEA) sensors with high response and selective detection have been widely reported. However, sluggish kinetics of recovery process, high operating temperature, unsatisfied long-term stability and high detection limit still restrict their further application. In this work, NiO nanofibers with different contents of Sn2+ are prepared via electrospinning method. Gas sensing investigation indicates that the sensor based on 6 at% Sn2+ doped NiO nanofibers with an elevated baseline resistance exhibits the highest gas response and excellent recovery characteristic to TEA at 200 °C. The sensor shows a low detection limit at ppb level and good long-term stability within three months. In addition, the sensor only has a small variation on baseline resistance, gas response and response/recovery speed under different relative humidity. The promising gas sensing performance can be mainly attributed to the increase of the oxygen vacancies defects caused by the difference of Sn2+ and Ni2+, resistance changes and the hollow structure of as-prepared nanofibers.

Preparation and Properties of PBO Nanofiber Membranes via Electrospinning and Thermal Conversion

In this study, Polybenzoxazole (PBO) nanofiber membranes are prepared by applying a three-step process, including synthesis of the electrospinning precursor with ortho-hydroxyl, electrospinning, and thermal conversion. Electrospinning is conducted at 10 kV with a distance of 10 cm and the solution concentration is 17.8% (w/v). Different flow rates are adopted to prepare polymer nanofiber membranes and test their properties. At the rate of 0.5 μL/min and 1 μL/min, uniform and compact films with nanofibers are obtained. The high-temperature transition from the precursor to PBO is then investigated systematically. Thermal treatment at 420°C is needed for complete cyclodecarboxylation conversion from the precursor to PBO. Diameters of the fibers in the as-prepared PBO nanofiber membrane are within the range of 120-130 nm. The membrane shows high thermal stability with the decomposition temperature of 619.8°C in N2 and 513.6°C in air respectively, presenting a promising application prospect in high-temperature areas.

Precursor-mediated in situ growth of hierarchical N-doped graphene nanofibers confining nickel single atoms for CO2 electroreduction

Despite the various strategies for achieving metal-nitrogen-carbon (M-N-C) single-atom catalysts (SACs) with different microenvironments for electrochemical carbon dioxide reduction reaction (CO2RR), the synthesis-structure-performance correlation remains elusive due to the lack of well-controlled synthetic approaches. Here, we employed Ni nanoparticles as starting materials for the direct synthesis of nickel (Ni) SACs in one spot through harvesting the interaction between metallic Ni and N atoms in the precursor during the chemical vapor deposition growth of hierarchical N-doped graphene fibers. By combining with first-principle calculations, we found that the Ni-N configuration is closely correlated to the N contents in the precursor, in which the acetonitrile with a high N/C ratio favors the formation of Ni-N3, while the pyridine with a low N/C ratio is more likely to promote the evolution of Ni-N2. Moreover, we revealed that the presence of N favors the formation of H-terminated edge of sp2 carbon and consequently leads to the formation of graphene fibers consisting of vertically stacked graphene flakes, instead of the traditional growth of carbon nanotubes on Ni nanoparticles. With a high capability in balancing the *COOH formation and *CO desorption, the as-prepared hierarchical N-doped graphene nanofibers with Ni-N3 sites exhibit a superior CO2RR performance compared to that with Ni-N2 and Ni-N4 ones.

Designing an Innovative Electrospinning Strategy to Generate PHBV Nanofiber Scaffolds with a Radially Oriented Fibrous Pattern.

Electrospinning has contributed substantially to the construction of nanofibrous scaffolds for potential tissue engineering and regenerative medicine applications. However, conventional electrospinning only has the ability to generate and collect nanofiber scaffolds with a randomly oriented fibrous pattern, which lack the necessary cell alignment guidance function. In this study, a novel electrospinning fiber-collecting device was designed and developed by setting a series of small pin-ring-structured collectors on a large plain plate. Specifically, we demonstrated that the pin-ring-structured collectors, which were constructed by inserting a metal pin into the center of a metal ring, could collect the as-electrospun nanofibers with radially oriented structures in an innovative manner. We first investigated the suitable polymeric concentration for electrospinning poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), and the optimum electrospinning concentration of PHBV was found to be 12% (w/v) PHBV dissolved in hexafluoroisopropyl alcohol (HFIP). Then, 12% (w/v) PHBV solution was electrospun into radially oriented nanofiber scaffolds using our novel electrospinning strategy, and their various performances were further compared with conventionally randomly oriented nanofiber scaffolds that were also produced from 12% (w/v) PHBV solution. The results showed that the radially oriented PHBV nanofiber scaffolds exhibited obviously enhanced mechanical properties and decreased hydrophobicity compared with the randomly oriented PHBV nanofiber scaffold controls. Importantly, the biological properties of radially oriented PHBV nanofiber scaffolds were also demonstrated to be enhanced, compared with randomly oriented PHBV nanofiber scaffolds, by effectively inducing cell alignment and significantly promoting cell proliferation. In sum, the present study indicates that our as-prepared nanofiber scaffolds with a radially oriented pattern are of great interest for advanced applications, such as wound dressings and tissue-engineered scaffolds.

Sustained release of EGF/bFGF growth factors achieved by mussel-inspired core–shell nanofibers with hemostatic and anti-inflammatory effects for promoting wound healing

Developing wound dressings with high-effective antibacterial activity, rapid hemostasis and accelerated wound healing are urgently needed in clinical wound treatment. Herein, in terms of coaxial electrospinning and mussel-inspired chemistry, a multifunctional polydopamine modified core–shell nanofiber membrane loaded with antibacterial quaternary ammonium salt grafted sulfonated chitosan (QAS-SCS) and bioactive EGF/bFGF in the core layer was constructed for hemostasis and promoting wound healing. The coaxial nanofibers exhibited excellent hydrophilicity,thermalstability, and suitable mechanical strengthand stretchability match human skin. The incorporation of QAS-SCS in the coaxial nanofibers led to efficient inherent antibacterialactivity, with bacteria inhibition rate of 95.15 ± 0.77% and 93.63 ± 1.44% against S. aureus and E. coli, respectively. The biocompatibility of nanofibers was studied through hemocompatibility and cell compatibility tests. In mouse full-thickness skin defect model, together with sustained release of dual growth factors (EGF/bFGF) achieved by core–shell structure, the multifunctional nanofibers were revealed to suppress the release of inflammatory cytokines, and reduce inflammation response, and enhance collagen deposition, and promote angiogenesis as well as hair follicles regeneration at the injury site, and finally accelerate wound healing. Overall, the as-prepared coaxial nanofibers simultaneously incorporated with QAS-SCS and EGF/bFGF provide an alternative strategy for skinwoundrepair.

In vitro and in vivo evaluation of hydrogel-based scaffold for bone tissue engineering application

The main objective of the current assay was to fabricate a sophisticated and effective scaffold based on the nanofibrous structure in combination with the 3D structure of hydrogels for bone tissue engineering. In this scenario, we fabricated nanofibers using electrospinning and carbonized them. The processed nanofibers were added to the polymeric solution and cross-linked to embedded nanofibers into the 3D structure of hydrogel. The obtained constructs were characterized using the most relevant characterization techniques. The results showed that as-prepared nanofibers have a diameter of 185 ± 63 nm and some breakages and fusions in the nanofiber's structure are apparent. The electron microscopy showed that the obtained 3D structure has a porous architecture with interconnected pores that are beneficial for bone regeneration. The biological evaluations also showed that the fabricated 3D scaffold was hemocompatible, cytocompatible, and regenerated new bone tissue in an animal model. In conclusion, these results implied that the fabricated NFC-integrated 3D scaffold exhibited promising characteristics beneficial for bone regeneration and can be applied as the bone tissue engineering scaffold.