90 results about "Tio2 nanofibers" patented technology

The invention discloses a TiO2@Ag / PVC (Poly Vinyl Chloride) composite antibacterial film and a preparation method thereof. The method comprises the following steps: after carrying out a surface modification on a TiO2@Ag nanofiber heterostructure by utilizing a silane coupling agent, evenly mixing the TiO2@Ag nanofiber heterostructure with the PVC, a plasticizer, a lubricating agent, a compound stabilizer and the like; and then carrying out a molten film blowing process, thereby obtaining the TiO2@Ag / PVC composite antibacterial film, wherein the modified TiO2@Ag has a structure containing nanosilver particles evenly attached to the surfaces of TiO2 nanofibers. By utilizing the cooperative actions of the two components of the TiO2@Ag heterostructure, a large number of bacteria and viruses attached to the surface of the film of the heterostructure can be killed in a short time under the light irradiation, and the majority of toxic compounds can be degraded. The TiO2@Ag / PVC composite antibacterial film is simple and convenient to process, long-acting, broad-spectrum in antibacterial effect, safe and nontoxic and suitable for various PVC plastic products.

The invention discloses TiO2-SiO2 bi-component nano-grade fiber and a preparation method thereof. According to weight proportions, 4 to 10 parts of strong ammonia water is added to 100 to 150 parts of absolute alcohol, the mixture is stirred for 2 to 8 hours, and 4 to 10 parts of tetraethoxysilane is added to the mixture, such that a solution is prepared; TiO2 nano-grade fiber is prepared with a static electricity spinning technology; the TiO2 nano-grade fiber is added to the solution while stirred under a temperature of 20 to 60 DEG C; the mixture is subject to a reaction for 6 to 8 hours, the product is filtered and washed; the product is subject to a drying treatment for 12 to 24 hours under a temperature of 70 to 100 DEG C, and is heated to a temperature of 500 to 1200 DEG C with a heating rate of 1 DEG C / min; the temperature is maintained for 4 to 8 hours, such that the TiO2-SiO2 bi-component nano-grade fiber is obtained. According to the invention, TiO2 is a main component of the nano-grade fiber, particle-shaped SiO2 extrusions are composed on the surface of the TiO2 nano-grade fiber. SiO2 and TiO2 are combined through chemical bonds. With the nano-grade fiber, property advantages of TiO2 and SiO2 nano-grade fiber are combined. The preparation method has advantages of simple process, mild condition, easy control, wide application range, and the like.

The invention discloses a non-stoichiometric tungsten oxide / titanium dioxide hierarchical nano-heterostructure photocatalyst. W18O49 nano-wires grow on TiO2 nano-fiber surfaces to form a W18O49 / TiO2 hierarchical nano-heterostructure. A preparation method of the W18O49 / TiO2 hierarchical nano-heterostructure includes steps: adding glacial acetic acid, butyl titanate and polyvinylpyrrolidone into absolute ethyl alcohol, preparing butyl titanate / polyvinylpyrrolidone composite nano-fibers by the aid of electro-spinning techniques, and performing high-temperature calcination to obtain TiO2 nano-fibers; adding tungsten hexacarbonyl into absolute ethyl alcohol, adding the prepared TiO2 nano-fibers, and performing solvothermal reaction to prepare the W18O49 / TiO2 hierarchical nano-heterostructure. Photocatalyst materials have super-wide spectrum response range and excellent photocatalytic reduction ammonia-borane hydrogenation performance.

The invention relates to a preparation method of TiO2 nano fibers with an adjustable crystal phase. The preparation method comprises a titanium source prehydrolysis process, an electrostatic spinning process and a high-temperature calcining process. By virtue of prehydrolysis, the density of fibers is improved and the calcining determines the composition of the crystal phase of the fibers; and the prepared TiO2 nano fibers can be a pure rutile phase and also can be an anatase phase, or be a mixed phase of the pure rutile phase and the anatase phase. By virtue of the preparation method, the problem that a titanium source is extremely easy to hydrolyze under relatively high humidity is solved; and a prehydrolysis method is adopted so that the problem that the titanium source is hydrolyzed in the electrostatic spinning process, and a needle head is blocked is effectively avoided. The preparation method has a simple process, the requirements on environment conditions are reduced and the process is easy to control.

The invention relates to a photocatalyst as well as a preparation method and an application method thereof. The preparation method comprises the following steps of: carrying out electrostatic spinning on TiO2 solution obtained by mixing tetraisopropyl titanate and PVP (Poly Vinyl Pyrrolidone) solution to obtain TiO2 nano fibers; immersing the TiO2 nano fibers into Zn(NO3)2 solution to flush and blow-drying the TiO2 nano fibers; then soaking, flushing and blow-drying the obtained TiO2 nano fibers in Na2S solution to obtain ZnS / TiO2 nano fibers; finally, immersing the ZnS / TiO2 nano fibers into Cd(NO3)2 solution and flushing and blow-drying the ZnS / TiO2 nano fibers; and soaking, flushing and blow-drying the obtained ZnS / TiO2 nano fibers in Na2S solution. According to the invention, the CdS-ZnS / TiO2 nano fibers with a one-dimensional structure are synthesized by adopting an electrostatic spinning technology and the successive ionic layer adsorption and reaction (SILAR) method for the first time. CdS is a narrow-band semiconductor material and ZnS can improve stability of the CdS, and thus, the TiO2 nano fibers subjected to modification of CdS and ZnS not only can widen the adsorption range in a visible region, but also can utilize the SILAR to obtain a CdS-ZnS / TiO2 composite material, better utilizes a visible light source, accelerates effective separation of a photon-generated carrier and improves photovoltaic conversion efficiency.

The invention discloses a silicon carbide (SiC) / titanium dioxide (TiO2) composite structure biological support material and a preparation method of the SiC / TiO2 composite structure biological support material. According to the SiC / TiO2 composite structure biological support material, TiO2 nano-fibers are developed on a titanium metal substrate to form a latticed microhole structure, and then a SiC transition layer is covered on the surfaces of the TiO2 nano-fibers. The SiC / TiO2 composite structure biological support material and the preparation method of the SiC / TiO2 composite structure biological support material explore a new way to modify a SiC biocompatibility transition layer in large area on the surface of a material according to the biocompatibility material. A tissue growth environment is imitated in a microcosmic level, and material / cell transition layers are prepared on the surface of a titanium skeleton, wherein the transition layers are provided with good nano-fiber mesh-shaped structures which can contain cells. When the transition layer is modified by SiC, a cell adhesion function and a cell proliferation function are improved, and the SiC / TiO2 composite structure biological support material and the preparation method of the SiC / TiO2 composite structure biological support material can be used for regeneration and reconstruction of skeleton structures.

The invention relates to a nano porous fiber filter tip additive material for selectively reducing the amount of released formonitrile in cigarette smoke, a preparation method and application, and the material, the method and the application belong to the field of cigarette harm and tar reduction. The invention is characterized in that the nano fiber material is a porous TiO2 nano fiber with a large special surface and a high length-to-diameter ratio obtained by the electrospinning technology. The nano fiber material can adsorb the formonitrile under the normal temperature, and when being added into a cigarette filter stick, the material can reduce the content of the formonitrile in the mainstream smoke of a cigarette by more than 40 percent, and does not affect the smoking quality of the cigarette. The preparation technique is simple, and the material can be used for selectively reducing the harm of cigarettes.