155 results about "Coffee ring effect" patented technology

The invention discloses an ink for inkjet printing and a preparation method as well as a zirconia film printed by the ink for the inkjet printing. The preparation method for the ink for the inkjet printing comprises the steps: (1) dissolving zirconium oxychloride in a mixed solvent to obtain a mixed solution, wherein the mixed solvent is prepared from ethylene glycol monomethyl ether and ethylene glycol in a volume ratio of (0.5 to 2) to (2 to 1)1; (2) adding PVP to the mixed solution obtained in the step (1), dissolving and standing to aging, and obtaining the ink for the inkjet printing. According to the ink for inkjet printing and the preparation method as well as the zirconia film printed by the ink for the inkjet printing, the polymer PVP is introduced in the process of preparing the ink for the inkjet printing, the viscosity and the dispersion of the solution are adjusted by due to the existence of the polymer, the system is more likely to generate gelatinization, and the flow of the liquid phase is restricted and the coffee-ring effect is weakened, so that the flatness of the surface of the zirconia film printed by the ink is improved.

The invention discloses an electroluminescent display panel, a preparation method thereof and a display device. The preparation method comprises the steps of forming an anode in each sub-pixel of a substrate and a pixel defining layer between the sub-pixels; spraying ink and an anti-solvent on the anode of each sub-pixel by adopting an ink-jet printing process; performing ultrasonic treatment anddrying treatment on the substrate sprayed with the ink and anti-solvent to form an organic electroluminescent layer; and forming a cathode on the organic electroluminescent layer so as to form an electroluminescent display panel. The anode of each sub-pixel is sprayed with the ink and anti-solvent by adopting the ink-jet printing process, and a solute is separated out according to principles thatthe anti-solvent is mutually dissolved with a solvent and that the solute is not dissolved or slightly dissolved in the anti-solvent. The solute is enabled to be uniformly dispersed through the ultrasonic treatment, and then the solvent and the anti-solvent are removed through the drying treatment, so that the uniformity of the film thickness of the prepared organic electroluminescent layer is enabled to be improved, and a coffee-ring effect of the organic electroluminescent layer is avoided.

A thin-film transistor and fabrication method thereof are provided. A controlled micro-line is formed by inkjet printing in combination with the coffee ring effect. At least two organic thin-film transistors are formed on two ring ridges of the coffee rings. For example, N-type and P-type soluble semiconductor materials may be formed on two adjacent ring ridges to form a complementary metal-oxide semiconductor (CMOS) device. Thus, the invention can simplify the process for fabricating thin-film transistors and increase their applications.

The invention discloses a structural color contact lens based on coffee ring effect and a preparation method thereof; the contact lens comprises a contact lens substrate, and is characterized in that the contact lens substrate contains ordered porous hydrogel which is used to form structural colors, is arranged annularly or circularly and is close-packed. With respect to other structural color contact lenses, the process of the preparation method is simple, and the prepared structural color contact lens has good biocompatibility, high light transmittance, and very good practicality.

The invention relates to a nanoparticle self-assembled transparent circuit board, a preparation method thereof, and an application thereof, and belongs to the technical field of microelectronics. Thenanoparticle self-assembled transparent circuit board comprises a nanoparticle conductive structure and a hydrophilic transparent substrate, wherein the nanoparticle conductive structure is a hollow structure; the nanoparticle conductive structure is located on the surface of the hydrophilic transparent substrate; and the nanoparticle conductive structures are distributed in an array. The preparation method comprises the following steps: firstly, preparing the hydrophobic seal, paving one side, with the concave part, of the seal on the paraffin film, and heating the paraffin film, so that theparaffin film is converted into a molten state; and setting a seal on a hydrophilic transparent substrate, adhering molten paraffin on the seal to the surface of the hydrophilic transparent substrate,then tearing off the hydrophilic transparent substrate, adding dropwise a nano-particle aqueous solution to the hydrophilic transparent substrate, and forming the transparent circuit board based on nano-particle self-assembly based on the coffee ring effect. The nanoparticle self-assembled transparent circuit board has the advantages of simple and rapid manufacturing, low cost, diversified manufacturing substrates, diversified patterns, high throughput, transparency and the like.

The invention discloses a low-cost green chemical synthesis method for nano-silver particles and a preparation method for a surface raman-enhanced active substrate based on the nano-silver particles. By utilizing the principle that silver ions are reduced by aldehyde groups in a silver mirror reaction, a trace amount of a silver-ammino complex solution is added into an aldehyde-group-contained compound solution with a certain concentration at the room temperature, so that the silver ions are reacted fully and reduced into elemental silver and generate the nano-silver particles. The nano-silver particles obtained by adopting the chemical synthesis method are even in particle size (diameters are between 35 nm to 38 nm), and good in monodispersity. Then, a synthetic nano-silver particle solution is directly dropped on a glass sheet or other carrier such as a silicon slice and an organic polymer film, after the solution is evaporated to be dry completely, a coffee-ring effect after a liquid drop is evaporated to be dry is effectively inhibited because of existing of excess glucose, and moreover the excess glucose severs as a protective layer to prevent the nano-silver particles from being oxidized, and thus the surface raman-enhanced active substrate with the good stability is obtained.

The invention provides a composite light conversion layer substrate for a Micro-LED array device and a preparation method of the composite light conversion layer substrate, and relates to the technical field of Micro-LED display. The substrate comprises a first substrate body, a filter film layer arranged on the first substrate body, a PDMS film layer arranged on the filter film layer, photoresistisolation gates arranged on the PDMS film layer, red light quantum dot film layers and green light quantum dot film layers, wherein the red light quantum dot film layers and the green light quantum dot film layers are arranged in grooves between the photoresist isolation gates respectively. According to the composite substrate, blue light emission of the Micro-LED blue light excitation light source can be effectively filtered out; meanwhile, due to the introduction of the flexible PDMS film layer in the composite substrate, the coffee ring effect occurring after ink-jet printing of a low-concentration quantum dot solution is effectively solved, the substrate is inverted above the blue light Micro-LED array, and full-color display based on the blue light Micro-LED array is achieved.

A thin-film transistor and method for fabricating a thin-film transistor is disclosed. In the method, a controlled micro-line is formed by inkjet printing in combination with the coffee ring effect. The micro-line may be a semiconductor or an insulator. A high-current thin-film transistor utilizing the micro-line of the coffee ring as a channel is formed. A high current TFT can be achieved by utilizing the micro-line structure of the coffee ring ridge as a TFT channel.