103results about How to "The number of layers is controllable" patented technology

The invention provides a self-assembling growth method of a layer-controllable colloidal crystal, which relates to a self-assembling growth method of a colloidal crystal and solves the problems that the traditional preparation method of colloidal crystal is more complicated, not easy to control and difficult to obtain the layer-controllable colloidal crystal. The method comprises the following steps of: 1. carrying out cleaning processing on a substrate, 2. preparing a colloidal particle suspension; and 3. inserting the substrate processed in the step 1 into the colloidal particle suspension prepared in the step 2, and placing into a constant-temperature incubator for 2-3 days. The method has the advantages of simple process, high efficiency, easy control and good repeatability and solvesthe problems of difficult layer number control of the self-assembling growing colloidal crystal and lower order degree of the obtained colloidal crystal of a traditional method and can be used for growing the colloidal crystals with large areas, ordered height and controllable layer number. The layer-controllable colloidal crystal obtained through self-assembly supplies a material for intensivelystudying the structure and the optical property of photonic crystals and simultaneously supplies a more rational and accurate template for three-dimensional ordered macroporous materials.

The invention relates to the field of graphene materials, in particular to a method for preparing graphene nanoplatelets with a disk type jet mill. Graphite powder is subjected to heat treatment firstly, then graphene is pretreated with an intercalation agent, Van der Waals's force between graphite layers is decreased, graphite layers are easier to strip, the graphite powder is added to the disk type jet mill, graphite rubs and collides with one another in jet stream collisions to produce shear force serving as the main force, friction force and impact force, graphite layers are stripped, and the graphene nanoplatelets are obtained. Continuous and mass production of the graphene nanoplatelets with uniform layers is realized, the yield is high, the cost is low, pollution is avoided, the layer thickness meets the use requirement in fields of rubber reinforcement, plastic reinforcement, coating corrosion prevention, lubrication and sewage treatment, and large-scale application of graphene is promoted.

The invention discloses a modified cellulose nanofiber membrane based on layer-by-layer self-assembly of lysozyme and silk protein as well as preparation and application thereof and belongs to the technical fields of high polymer materials and biomedical materials. According to the invention, a cellulose acetate nanofiber membrane is prepared by utilizing an electrospinning technique and lysozyme and silk protein which are opposite in charges are alternately assembled on the surface of the cellulose nanofiber membrane by adopting a layer-by-layer assembly technique so as to obtain the modified cellulose nanofiber membrane disclosed by the invention. The membrane disclosed by the invention has the advantages that the preparation equipment is simple, raw materials are low in cost, non-toxic and biodegradable, the whole process is simple to operate and the number of lysozyme / silk protein layers is controllable. Proved by antibacterial tests, cell survival tests, cell fluorescence staining tests, cell adhesion tests and in vitro wound healing tests, the modified cellulose nanofiber membrane disclosed by the invention has good antibacterial performance and cell adhesiveness and is capable of increasing the wound healing efficiency and preventing the wound infection, so that the membrane is a very good wound repairing material and can be used in the wound repairing field.

The invention discloses a composite film for a flow energy storage battery and an application of the composite film in the flow energy storage battery. The composite film disclosed herein is characterized by using one or more than two of organic polymer resin or sulfonated polymer resin as raw material to prepare a porous film as a matrix, and successively alternately self-assembling cationic polymer resin and anion polymer resin layer by layer on the surface of the matrix by static electricity to form the composite film. The composite film disclosed herein has the advantages of simple preparation method, environmentally friendly process, controllable number of assembling layers, and adjustable ionic selectivity. Compared with original porous films, the composite film disclosed herein has good hydrophilicity and vanadium ion blocking ability, and an all vanadium flow energy storage battery assembled by using the composite film has higher efficiency and longer self-discharge time.

The invention discloses a method for preparing grapheme nano belts by etching carbon nano tubes through water vapor. The method comprises the steps of putting multi-wall carbon nano tubes into a polyfluortetraethylene inner liner, adding a certain amount of distilled water into the inner liner, vibrating to ensure that the nano tubes are uniformly dispersed, then putting the polyfluortetraethylene inner liner into a reaction kettle, heating to 150 to 225 DEG C, keeping constant temperature for 5 to 20 h, so as to ensure that the multi-wall carbon nano tubes are longitudinally cracked to form high-quality grapheme nano belts. The grapheme nano belts prepared through the method have the advantages of less folds, uneasiness in aggregation, controllable number of layers, high yield and the like, at the same time, the preparation process is simple and easy to operate and can be accomplished at one step, a surface active agent is not required to be adopted for dispersing, and the process ispollution-free and environmental-friendly. The method overcomes the disadvantages of complex process, severe pollution, low yield and the like during the grapheme preparation through other methods.

The invention relates to the field of the controllable preparation of high-oxidation-resistance single / double-wall carbon nanotubes, in particular to a controllable preparation method of high-oxidation-resistance high-purity single / double-wall carbon nanotubes. The controllable preparation method comprises the following steps of: introducing carbon-source gas by utilizing a floating-catalyst chemical vapor-deposition method and using ferrocene as a catalyst precursor and sulfur powder as a growth promoter at a higher temperature, growing the high-oxidation-resistance carbon nanotubes under a high hydrogen-gas carrier-gas flow quantity, and simultaneously realizing the controlled growth of the single-wall or double-wall carbon nanotubes by regulating and controlling the quantity of the added growth promoter for sulfur to obtain the high-purity high-oxidation-resistance single / double-wall carbon nanotubes, wherein the single-wall or double-wall carbon nanotubes account for more than 90 percent of the total content of carbon tubes, and the highest oxidation-resisting temperatures of the single-wall and double-wall carbon nanotubes are respectively 770 DEG C and 785 DEG C. The single / double-wall carbon nanotubes with high crystallization degrees, fewer structural defects and high purity are obtained by the method, have the characteristics of excellent electrical conductivity, highelasticity, high strength and the like and are expected to be applied to transparent conductive films and the related devices of the transparent conductive films.

The invention discloses a method of preparing a hanging graphene support film by selectively etching a growth substrate. The preparation method avoids a graphene transfer process, is high in efficiency and low in cost and can obtain the high-quality graphene support film by one-step etching. The prepared graphene support film does not require auxiliary support by any high polymer films and high polymer fibers; the number of layers of the graphene support film is controllable; the graphene support film is high in completeness (90-97%), large in hanging area (a diameter is 10-50 micrometers) andwide in clean area (greater than 100 nm); massive preparation can be achieved. In addition, the graphene support film can be directly used for a transmission electron microscope support film and achieve high resolution imaging of nano particles.