Electrospun MgO/Nylon 6 Hybrid Nanofibers for Protective Clothing

Magnesia(MgO) nanoparticles were produced from magnesite ore(MgCO3) using ball mill. The crystalline size, morphology and specific SSA were characterized by X-ray diffraction analysis, transmission electron microscopy and Brunauer-Emmett-Teller method, respectively. MgO nanoparticle-incorporated nylon6 solutions were electrospun to produce nanofiber mats. Surface morphology and internal structure of the prepared hybrid nanofiber mats were examined by scanning electron microscopy and high-resolution transmission electron microscopy, respectively. The fire retardancy and antibacterial activity(Staphylococcus aureus and Escherichia coli) of coated fabrics made from MgO/nylon 6 hybrid nanofiber are better than those from nylon6 nanofiber.

Construction of Electrospun Organic/Inorganic Hybrid Nanofibers for Drug Delivery and Tissue Engineering Applications

Electrospun nanofibers hold a great potential in biomedical applications due to their advantages of large specific surface area,good biocompatibility,easy fabrication and surface modification.In particular,organic/inorganic hybrid nanofibers exhibit enhanced mechanical properties and long-term sustained release or controlled release profile of encapsulated drugs,which enables hybrid nanofibers to serve as desired platform for drug delivery and tissue engineering applications.This review summarizes the recent progresses in the preparation,performances and applications of hybrid nanofibers as drug delivery vectors for antibacterial and antitumor therapy,and as nanofibrous scaffolds for bone tissue engineering or other types of tissue engineering applications.Nanofibers doped with various types of inorganic nanoparticles(e.g.,halloysite,laponite®,nano-hydroxyapatite,attapulgite,carbon nanotubes,and graphene,etc.)are introduced and summarized in detail.Future perspectives are also briefly discussed.

Highly sensitive hybrid nanofiber-based room-temperature CO sensors： Experiments and density functional theory simulations

Chemical sensors （CSs） are an emerging area in nanoscience research, which focuses on the highly sensitive detection of toxic and hazardous gases and disease- related volatile organics. While the field has advanced rapidly in recent years, it lacks the theoretical support required for the rational design of innovative materials with tunable measurement responses. Herein, we present a one-dimensional （1D） hybrid nanofiber decorated with ultrafine NiO nanoparticles （NiO NPs） as an efficient active component for CSs. Highly dispersed （110）-facet NiO NPs with a high percentage of Ni2~ active sites with unsaturated coordination were confined in a TiO2 nanofiber （TiO2 NF） matrix that is favorable for surface catalytic reactions. The CSs constructed using the 1D heterostructure NiO/TiO2 nanofibers （NiOdrio2 HNFs） exhibited a highly selective response to trace CO gas molecules （1 ppm） with high sensitivity （AR/Ro = 1.02）, ultrafast response/ recovery time （T 〈 20 s）, and remarkable reproducibility at room tem- perature. The density functional theory （DFT） simulations and experimental results confirmed that the selective response could be attributed to the high molecular adsorption energy of the NiO nanoparticles with （110） facets and abundant interfaces, which act synergistically to promote CO adsorption and facilitate charge transfer.

Multifunction Zno/carbon hybrid nanofiber mats for organic dyes treatment via photocatalysis with enhanced solar-driven evaporation

ZnO-based photocatalytic materials have received widespread attention due to their usefulness than other photocatalytic materials in organic dye wastewater treatment.However,its photocatalytic efficiency and surface stability limit further applicability.This paper uses a one-step carbonization method to prepare multifunctional ZnO/carbon hybrid nanofiber mats.The carbonization creates aπ-conjugated carbonaceous structure of the mats,which prolongs the electron recovery time of ZnO nanoparticles to yield improved photocatalytic efficiency.Further,the carbonization reduces the fiber diameter of the carbon hybrid nanofiber mats,which quadruples the specific surface area to yield enhanced adsorption and photocatalytic performance.At the same time,the prepared nanofiber mats can increase the evaporation rate of water under solar irradiation to a level of 1.46 kg·m^(-2)·h^(-1)with an efficiency of 91.9%.Thus,the nanofiber mats allow the facile incorporation of photocatalysts to clean contaminated water through adsorption,photodegradation,and interfacial heat-assisted distillation mechanisms.

Reduced graphene oxide-embedded nerve conduits loaded with bone marrow mesenchymal stem cell-derived extracellular vesicles promote peripheral nerve regeneration

We previously combined reduced graphene oxide(rGO)with gelatin-methacryloyl(GelMA)and polycaprolactone(PCL)to create an rGO-GelMA-PCL nerve conduit and found that the conductivity and biocompatibility were improved.However,the rGO-GelMA-PCL nerve conduits differed greatly from autologous nerve transplants in their ability to promote the regeneration of injured peripheral nerves and axonal sprouting.Extracellular vesicles derived from bone marrow mesenchymal stem cells(BMSCs)can be loaded into rGO-GelMA-PCL nerve conduits for repair of rat sciatic nerve injury because they can promote angiogenesis at the injured site.In this study,12 weeks after surgery,sciatic nerve function was measured by electrophysiology and sciatic nerve function index,and myelin sheath and axon regeneration were observed by electron microscopy,immunohistochemistry,and immunofluorescence.The regeneration of microvessel was observed by immunofluorescence.Our results showed that rGO-GelMA-PCL nerve conduits loaded with BMSC-derived extracellular vesicles were superior to rGO-GelMA-PCL conduits alone in their ability to increase the number of newly formed vessels and axonal sprouts at the injury site as well as the recovery of neurological function.These findings indicate that rGO-GelMA-PCL nerve conduits loaded with BMSC-derived extracellular vesicles can promote peripheral nerve regeneration and neurological function recovery,and provide a new direction for the curation of peripheral nerve defect in the clinic.

A Robust Solution-Based Approach to Monodisperse Hybrid Janus Nanofibers

Monodisperse hybrid Janus nanofibers with the structure that one Au nanoparticle(AuNP)is connected to one end of a polymeric nanofiber were prepared by the self-assembly between polymeric micelles and the tadpole-like conjugates resulting from one-to-one complexation of long DNA chains with AuNPs.