20 results about "Electrospun nanofiber" patented technology

The invention discloses a preparation method and application of an electrospun nanofiber membrane-based flexible SERS (Surface Enhanced Raman Scattering) substrate, and belongs to the field of preparation of SERS substrates. The preparation method comprises the following steps: firstly, preparing a polymer nanofiber membrane by adopting an electrostatic spinning method, and then depositing noble metal nanoparticles on the surface of the electrospinning polymer nanofiber membrane by adopting a magnetron sputtering technology, so as to obtain the noble metal nanoparticle and polymer nanofiber membrane flexible SERS (Surface Enhanced Raman Scattering) substrate. According to the present invention, the problems that the SERS substrate cannot be accurately controlled and cannot be continuously produced are solved, the preparation method has advantages of simpleness, high efficiency, no pollution, low cost and large-scale manufacturing compared with the existing preparation method, the substrate has characteristics of large specific surface area, high density hot spot distribution, good stability and adjustable size structure, and the trace detection of the pesticide residue on the irregular surface can be achieved.

A nanodiamond-reinforced nanofiber scaffold system for skin regeneration, consisting of a multilayered, electrospun nanofiber matrix formed from one or more biocompatible polymers selected from polycaprolactone (PCL), poly(lactic-co-glycolic acid) (PLGA), chitosan, gelatin or collagen, wherein nanodiamonds are present in an amount of 0.1 to 5 wt.-% are incorporated and surface-functionalized with oxygen, hydroxyl, or carboxyl groups to ensure homogeneous dispersion within the polymer matrix, the scaffold being characterized by a controlled fiber diameter in the range of 100 to 800 nm, an interconnected porosity between 60 and 90%, a tensile strength of 2 to 10 MPa, a degradation time of 2 to 8 weeks, and the ability to improve cell adhesion, proliferation, and migration of fibroblasts and keratinocytes, while simultaneously exhibiting antioxidant activity, reduced formation of reactive oxygen species, and the optional incorporation of bioactive agents selected from growth factors, antioxidants, or antimicrobial compounds to accelerate wound healing and skin tissue regeneration.

The invention belongs to the field of electrostatic spinning, and relates to a melt electrostatic spinning nanofiber membrane and a preparation method thereof. The nanofiber membrane comprises aliphatic-aromatic copolyester fibers and inorganic nano functional powder, wherein the aliphatic-aromatic copolyester fibers are aliphatic-aromatic copolyester fibers; wherein the average diameter of the aliphatic-aromatic copolyester fiber is 100-1000 nm, preferably 200-850 nm, and the content of the inorganic nano functional powder is 0.01-10 wt%, preferably 1-6 wt%, on the basis of the total weight of the nanofiber membrane. The preparation method of the nanofiber membrane provided by the invention is low in cost, good in continuity, safe, environment-friendly and suitable for industrial production; the obtained nanofiber membrane has biodegradability and no solvent residue, has the functions of electric conductors, sensing, energy collection and storage and the like due to the addition of functional powder, and can be used for preparing high-efficiency low-resistance filtering materials, flexible pressure sensing devices, antibacterial and antiviral materials, mulching film protection materials and the like.

This invention belongs to the field of environmental engineering materials technology and discloses a method for preparing an antibiotic-encapsulated nanofiber membrane biocarrier for the domestication of specific microbial populations. The aim is to achieve the domestication and control of specific microbial populations through the combination of antibiotic encapsulation and nanofiber membranes. This antibiotic-encapsulated nanofiber membrane biocarrier utilizes the high specific surface area and good permeability of the porous, expanded structure of emulsion electrospun nanofiber membranes to effectively immobilize antibiotics and achieve precise regulation of microbial populations through a slow release mechanism. Simultaneously, the microstructure of the nanofiber membrane provides a suitable growth environment for microorganisms, promoting the proliferation and domestication of specific populations. This invention not only improves the efficiency of microbial population domestication but also reduces the amount of antibiotics used, resulting in both environmental and economic benefits. The preparation process of this carrier is simple and convenient, suitable for wastewater treatment, bio-fermentation, and other fields, and has broad application prospects.

The invention relates to the technical field of friction nanometer power generation, in particular to a core-shell structure electrostatic spinning nanofiber membrane, a preparation method, application and a friction nanometer power generator. The nanofiber membrane comprises a shell layer and a core layer coated in the shell layer, the components of the shell layer comprise TiO2 nanoparticles and PVDF, and the components of the core layer comprise multi-walled carbon nanotubes and PVDF; the nanofiber membrane is prepared by adopting a coaxial electrostatic spinning mode, and can be used as a friction layer of a friction nanometer generator. The friction nanometer generator has the advantages of high performance and controllable structure, is suitable for the preparation method of the friction layer of various material systems, and can be widely applied to the fields of self-driven sensors, wearable energy collection devices, intelligent electronic skin and the like.

The application relates to the technical field of nanofiber membrane technology, and particularly relates to an electrospun nanofiber membrane loaded with seaweed polysaccharide and application of the electrospun nanofiber membrane as a skin wound dressing, which comprises the following steps: dissolving polyvinyl alcohol powder in deionized water, heating and stirring until complete dissolution to form a transparent glue solution, adding carboxymethyl agarose and sodium alginate in proportion, adding CaSO4, MgCl2 and ZnCl2 to prepare a hydrogel precursor solution; blending the hydrogel precursor solution with a modified polyurethane solution to obtain a blended solution, adding silver nitrate solution into artemisia extract to obtain a mixed solution, mixing the blended solution with the mixed solution to obtain a spinning solution, and obtaining the electrospun nanofiber membrane loaded with seaweed polysaccharide through an electrospinning technology. After the prepared electrospun nanofiber membrane loaded with seaweed polysaccharide absorbs exudate, a soft hydrogel is formed on the side in contact with the wound, so that adhesion with new granulation tissue is avoided.

The application belongs to the technical field of functional material preparation, and particularly relates to a preparation method of an AIEgen-doped PLA electrospinning nanofiber membrane with pH fluorescence color change property. The preparation method comprises the following steps: (1) synthesizing an aggregation-induced emission body 5-(4-((4-(1,2,2-triphenylstyryl) benzylidene) amino) isoindoline-2-yl) piperidin-2-one (TPE-LAN); (2) preparing a TPE-LAN electrospinning solution; and (3) preparing the AIEgen-doped PLA electrospinning nanofiber membrane with pH fluorescence color change property. The AIEgen-doped PLA electrospinning nanofiber membrane with pH fluorescence color change property prepared by the preparation method has the aggregation-induced emission property, biocompatibility and antibacterial property, and overcomes the problem of light quenching caused by aggregation, and can be applied to the field of food monitoring.

The application provides a nanofiber-based aerogel and a preparation method and application thereof, relates to the technical field of aerogels, and the preparation method of the nanofiber-based aerogel comprises the following steps: electrospinning a polymer-containing spinning solution to obtain a nanofiber membrane; performing mechanical dispersion treatment on the nanofiber membrane to obtain a nanofiber suspension; and after mixing the nanofiber suspension with a functional nanomaterial, performing solidification to obtain the nanofiber-based aerogel. The electrospun nanofiber is peeled off, cut and then reassembled into a three-dimensional porous block (i.e. an aerogel), which not only retains the advantages of a high specific surface area and connected pores of the nanofiber membrane, but also significantly reduces water flow resistance by constructing a three-dimensional network, and meanwhile, the heat insulation performance is enhanced. The structure can more effectively realize fast water supply and low heat loss, reduce the accumulation of salt on the surface of the material, and thus improve the stability and efficiency of interfacial water evaporation.

This invention belongs to the field of nanomaterials, and particularly relates to an electrospun nanofiber membrane, its preparation method, and its applications. The electrospun nanofiber membrane provided by this invention is prepared by electrospinning a spinning solution containing polyurethane, polyvinylpyrrolidone, and Tb(BA)3phen. By optimizing the composition of the electrospinning solution, especially by doping with the functional material Tb(BA)3phen, this invention enables the membrane material to acquire a large number of triboelectric charge trapping sites, reducing charge dissipation and increasing the accumulation of triboelectric charge; simultaneously, it endows the membrane material with good flexibility, stretchability, and hydrophobicity. The electrospun nanofiber membrane provided by this invention combines excellent flexibility and high triboelectric output performance, showing promising application prospects in the field of triboelectric nanogenerators.

The invention belongs to the technical field of functional material preparation, and particularly relates to a preparation method of an AIEgen doped PLA electrostatic spinning nanofiber membrane with a pH fluorescent discoloration property. The preparation method comprises the following steps: (1) synthesizing an aggregation-induced luminophor 5-(4-((4-(1, 2, 2-tristyryl) benzylidene) amino) isoindoline-2-yl) piperidine-2-ketone (TPE-LAN); (2) preparing a TPE-LAN electrostatic spinning solution; and (3) preparing the AIEgen doped PLA electrostatic spinning nanofiber membrane with the pH fluorescence discoloration property. The AIEgen doped PLA electrostatic spinning nanofiber membrane with the pH fluorescence discoloration property, which is prepared by the preparation method disclosed by the invention, has the aggregation-induced emission property, biocompatibility and antibacterial property, overcomes the problem of luminescence quenching caused by aggregation, and can be applied to the field of food monitoring.

1. Name of the product in this design: Electrospinning Machine (Experimental). 2. Application of this design: It is mainly used in the scientific research field to prepare electrospun nanofiber membrane samples. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention belongs to the field of seawater desalination materials, and particularly relates to a self-healing and reconfigurable integrated Janus nanofiber membrane as well as a preparation method and application thereof. According to the preparation method of the Janus nanofiber photo-thermal film, two dynamic polymers including hydrophilic polyethylene glycol polyurethane (PPG) and hydrophobic polydimethylsiloxane polyurethane (PDMS) and PU are synthesized on the basis of a dynamic Diels-Alder bond, and then the PPG and PU and PDMS and PU-CNTs Janus double-layer nanofiber photo-thermal film is prepared through continuous electrostatic spinning. The upper layer and the lower layer of the prepared Janus photo-thermal film have different wettability, interfaces are combined through covalent bonds, and the interface bonding force is 22 N * m < 1 >. The stable evaporation rate of 1.34 kg.m < 2 >. H < 1 > is realized under the illumination of 1 kW. M < 2 >; reversible dissociation of the dynamic bond cross-linked network enables the Janus nanofiber membrane to have self-healing and reconfigurable capabilities and keep the photo-thermal performance of the Janus nanofiber membrane. The dynamic cross-linked polymer is applied to preparation of the Janus electrostatic spinning nanofiber photo-thermal film, and the problems of weak interface bonding force and poor durability and sustainability of the Janus electrostatic spinning nanofiber photo-thermal film are solved.

Embodiments include a filter material including an electrospun nanofiber membrane and an active nanomaterial agent incorporated into the electrospun nanofiber membrane, wherein the electrospun nanofiber membrane filters disease-causing agents and the wherein the active nanomaterial agent degrades disease-causing agents. Embodiments further include a face mask and / or respirator including a filter material, wherein the filter material includes an electrospun nanofiber membrane and an active nanomaterial agent incorporated into the electrospun nanofiber membrane, wherein the electrospun nanofiber membrane filters disease-causing agents and the wherein the active nanomaterial agent degrades disease-causing agents.

The invention discloses an integrated multifunctional artificial scalp for wig and a preparation method thereof, the preparation method takes an electrostatic spinning nanofiber membrane as a core carrier, and the integrated multifunctional artificial scalp is prepared from a spinning solution containing a fluoride-free water repellent agent, a quaternary ammonium salt type cationic surface active agent and a bacteriostatic agent through an electrostatic spinning process, the fiber membrane with the micro-nano hole structure is formed. According to the structural design, the artificial scalp is endowed with an excellent synergistic effect of air permeability, waterproofness and antibacterial performance, a dry and comfortable state in a wearing process can be effectively maintained, microorganism breeding in a humid environment is inhibited, and the artificial scalp has wearing comfort and use safety.

The invention discloses a VOC colorimetric sensing array and a preparation method and application thereof.The VOC colorimetric sensing array comprises a plurality of colorimetric sensing units arranged on a substrate, each colorimetric sensing unit comprises a VOC sensitive chemical color developing agent and an electrostatic spinning nanofiber membrane, the VOC sensitive chemical color developing agent is loaded in the electrostatic spinning nanofiber membrane, the electrostatic spinning nanofiber membrane is loaded in the electrostatic spinning nanofiber membrane, and the VOC sensitive chemical color developing agent is loaded in the electrostatic spinning nanofiber membrane. VOC sensitive chemical color developing agents contained in the at least two colorimetric sensing units are different. According to the preparation method, an electrostatic spinning method is adopted, and a VOC sensitive chemical color developing agent is directly added into a spinning solution, so that the VOC sensitive chemical color developing agent is uniformly wrapped or immobilized in macromolecular fibers, and the nanofiber membrane sensing array with a stable'reagent-in-fiber 'structure is constructed. Compared with a colorimetric sensor prepared by a traditional dispensing method, the colorimetric sensor has the characteristics of large specific surface area, high stability, repeatability and anti-interference performance, and the reliability and comparability of a detection result are ensured.

The application provides a preparation method of a gradient fiber membrane and the gradient fiber membrane. The preparation method comprises the following steps: electrospinning a high-molecular polymer solution, and then soaking the obtained electrospinning nanofiber membrane in a cation solution to clean the nanofiber membrane, and then soaking the cleaned nanofiber membrane in an anion solution to obtain a primary self-assembled fiber membrane; the liquid level of the cation solution and the anion solution is kept unchanged during the soaking, and the liquid level is continuously increased; the above operation is repeated, and after n times, an n-layer self-assembled gradient fiber membrane is obtained, and n is greater than or equal to 3. The gradient fiber membrane prepared by the application can keep good morphology, porosity and good orientation; the self-assembled layer number is increased, and more bioactive substances can be adsorbed on the nanofiber; the fiber membrane has extremely strong hydrophilicity, extremely high cell activity, good biocompatibility, and the cell behavior can be well controlled by designing a gradient structure of bioactive components on the electrospinning nanofiber, so that the cell migration is promoted.

The invention provides nanofiber-based aerogel as well as a preparation method and application thereof, and relates to the technical field of aerogel, the preparation method of the nanofiber-based aerogel comprises the following steps: performing electrostatic spinning on a spinning solution containing a polymer to obtain a nanofiber membrane; carrying out mechanical dispersion treatment on the nanofiber membrane to obtain a nano short fiber suspension; and mixing the nano short fiber suspension with a functional nano material, and curing to obtain the nano fiber-based aerogel. The electrostatic spinning nanofibers are stripped and cut and then reassembled into a three-dimensional porous block (namely aerogel), the advantages of high specific surface area and communicated pore channels of a nanofiber membrane are reserved, the water flow resistance is remarkably reduced by constructing a three-dimensional network, and meanwhile, the heat insulation performance is enhanced. According to the structure, rapid water supply and low heat loss can be more effectively achieved, accumulation of salt on the surface of the material is reduced, and therefore the stability and efficiency of interface water evaporation are improved.

A high-air-permeability and high-barrier nanofiber composite material of the present invention comprises an electrospun nanofiber membrane layer, a fiber-structure support layer and an adhesive layer between the nanofiber membrane layer and the support layer, wherein the basis weight of the electrospun membrane layer is 1.0-12 g per 1 m2, the adhesion area ratio between the nanofiber membrane layer and the fiber-structure support layer is 60% or less, the air permeability is 2.0-40 mm / s, and the bacterial and viral filtration efficiency is 99% or higher.

The invention provides a fall webworm pheromone humidity response electrospinning nanofiber, a preparation method thereof and a lure core, polylactic acid, cellulose nanocrystals and fall webworm pheromone are combined to prepare the nanofiber with the humidity response characteristic, the cellulose nanocrystals (CNCs) serve as a moisture absorption switch, PLA matrix is used for controlled release, and when the humidity reaches a threshold value, the electrostatic spinning nanofiber with the humidity response characteristic is obtained. The expansion of the CNCs initiates the deformation of a PLA phase region, and a pheromone diffusion path is opened. The prepared nanofiber has the advantages of being high in tensile strength, sensitive in humidity response and environmentally friendly, and the problems that when traditional nanofiber loads pheromone, the environmental response is poor, and the release behavior is uncontrollable are solved.

This invention relates to a piezoelectric nanofiber yarn, specifically to a method and apparatus for preparing a conductive filament / electrospun nanofiber / ITO film composite yarn. The method involves polarizing the PVDF electrospun nanofiber / ITO composite film in a high-voltage electric field to improve the piezoelectric properties of PVDF. The composite film is then irradiated with a laser beam and cut into 5mm wide strips. These strips are passed through guide grooves and a pair of roller jaws. A guide wheel introduces a conductive filament, which is then twisted with the PVDF electrospun nanofiber / ITO composite film strip to form the piezoelectric nanofiber yarn. This piezoelectric nanofiber yarn can generate a 3mV output voltage when stretched and retracted under a force of 2cN. This allows the yarn to be woven into smart clothing as a sensor for health monitoring. It features high flexibility, good breathability, good washability, and durability, making it suitable for widespread application.