155 results about "Coffee ring effect" patented technology

The invention provides a whispering gallery mode photonic device and a preparation method thereof. According to the preparation method of a micro ring array structure, solvent droplets are utilized to dissolve a polymer film, so that a "coffee ring effect" can be generated, and therefore, polymer can be accumulated at the periphery of liquid so as to form an annular structure of which the height is obviously different from the height of the film, and conduction and confinement of light in the polymer structure can be realized; and light signals are inputted to the micron ring structure through utilizing excitation, scattering or near field coupling modes, so that a resonance effect in a whispering gallery mode can be realized. The prepared micron ring structure can be adopted as a high-quality factor optical micro cavity, so that a modulation-mode spectrum can be obtained, the width of spectral lines of the spectrum being significantly narrowed; a whispering gallery-mode light amplification stimulated emission can be realized through optical gain; and in a multi-ring coupled array structure, light signal processing and high sensitive response to outside stimuli can be realized according to the wavelength change information of the modulated spectrum and laser modes.

The invention relates to the technical field of displaying, and discloses a manufacturing method of an OLED displayer. The method includes the steps of forming an array comprising first electrodes on a substrate, wherein the areas corresponding to the first electrodes are display areas; forming pixel defining layers between the first electrodes, and enabling the widths of the cross sections of the pixel defining layers to be in the trend that the middles are wide, and the widths of the upper portions and the lower portions are successively reduced; forming organic luminous layers on the first electrodes between the pixel defining layers; at least forming second electrodes on the organic luminous layers. The invention further discloses the OLED displayer and a display device. According to the OLED displayer manufactured with the method, the coffee ring effects of the organic luminous layers are relieved to the greatest extent, faults of the second electrodes can be avoided, the display effect is accordingly improved, and materials of the second electrodes are saved.

Aqueous dispersions of artificially synthesized, mussel-inspired polyopamine nanoparticles were inkjet printed on flexible polyethylene terephthalate (PET) substrates. Narrow line patterns (4 μm in width) of polydopamine resulted due to evaporatively driven transport (coffee ring effect). The printed patterns were metallized via a site-selective Cu electroless plating process at a controlled temperature (30° C.) for varied bath times. The lowest electrical resistivity value of the plated Cu lines was about 6 times greater than the bulk resistivity of Cu. This process presents an industrially viable way to fabricate Cu conductive fine patterns for flexible electronics at low temperature, and low cost.

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 high-uniformity ink-jet printing method of large-area films. The method comprises the following steps: firstly washing and drying a substrate by putting the substrate in a washing solution, washing the substrate by using ultrasonic oscillation and drying the substrate after washing; secondly printing films by setting printing parameters and graphs, printing on the washed and dried substrate by using a non-contact spot-jetting printing system, heating the lower part of the substrate during printing, wherein printing ink adopts low-temperature gelatinization ink; and finally drying the films by continuously heating the lower part of the substrate and drying the films. Compared with the prior art, the problem of low uniformity during ink-jet printing of the large-area films is solved; a method of heating and printing the substrate is adopted on the basis of considering the coffee-ring effect of single liquid droplet; the printing liquid droplets are used for simultaneously printing and forming gelatinization edge areas; the flowing of a large amount of fluid between liquid droplets is avoided, so that the overall uniformity of printing of the films is achieved.

High performing nanoparticle compositions suitable for printing, such as by inkjet printing, are provided herein. In particular, there is provided a conductive ink formulation comprising silver nanoparticles which has optimal performance, such as, reduced coffee ring effect, improved adhesion to substrates, and extended printhead de-cap time or latency time. The ink formulation comprises two or more solvents and a resin.

The invention discloses a method of manufacturing a dense nano granular film and an ordered nanowire film by using coffee-ring effects, which belongs to the technical field of film manufacturing. A substrate which needs film deposition is placed on an oblique platform with a certain angle to control movement of a three-phase line so as to control coffee-ring effects, and the method is applied to manufacturing of a nano material film. The substrate which needs nano material deposition is put to a container with a corresponding size, and placed on an oblique platform with an oblique angle of about 10 degree, a thickened nano material solution is poured, and the overall container is put in an oven for 50 degree, heat preservation is carried out until the solution is dried completely. The dense nano granular film or the ordered nanowire film can be manufactured on the substrate conveniently and quickly.

The invention provides a display substrate and a manufacturing method thereof, and a display device, which belong to the technical field of display. The manufacturing method of the display substrate comprises a step of printing organic solution in a sub-pixel region defined by a pixel definition layer to prepare a functional film layer. The step comprises the following sub steps: printing organicsolution in the sub-pixel region; and heating and drying the organic solution, and making the evaporation rate of the solvent in the edge portion of the sub-pixel region lower than the evaporation rate of the solvent in the middle portion of the sub-pixel region during heating and drying. Through the technical scheme of the invention, a functional film layer with uniform thickness can be formed inthe sub-pixel region, and the coffee ring effect is avoided.

The invention provides an array substrate and a method of manufacturing the same. The array substrate comprises a substrate unit, an anode layer, a first pixel defining layer, a light-emitting layer covering the anode layer, and a second pixel defining layer formed on the first pixel defining layer, wherein the anode layer and the first pixel defining layer are formed on the substrate unit. The second pixel defining layer covers an edge region of the light-emitting layer. Therefore, a problem of a non-uniform film layer caused by a coffee ring effect is solved.

The invention provides a pixel-defining structure and a preparation method thereof, and an OLED device. The preparation method comprises the following steps: providing a substrate; forming a pixel defining film on the substrate by a composition process; performing surface treatment on the top of the pixel defining film to form a first pixel defining layer having hydrophilicity and a second pixel defining layer having hydrophobicity. In the pixel defining structure prepared by the preparation method provided by the inveniton, the first pixel defining layer of the pixel defining film has hydrophilicity, the second pixel defining layer is hydrophobic, such that the contact angle between the first pixel defining layer and the ink of the organic luminescent material is small, the contact anglebetween the second pixel defining layer and the ink of the organic luminescent material is large, so that the coffee ring effect can be reduced, an organic electroluminescent film with uniform film thickness can be formed, and since the second pixel defining layer has hydrophobicity, the ink of different organic luminescent materials can be prevented from flowing into adjacent pixel regions to cause color mixing, and the performance of the OLED device can be improved.

The invention discloses a flexible substrate, a display device and a preparation method. The flexible substrate comprises a flexible transparent conductive substrate body and a flexible insulating substrate body located on the flexible transparent conductive substrate body, and multiple grooves penetrating into the flexible transparent conductive substrate body is distributed in the flexible insulating substrate body. The flexible substrate has a two-layer structure, the flexible conductive substrate body is uniform in thickness, the provided electron mobility is high in consistent degree, the problems that due to the fact that vacuum evaporation occurs, the cost is high, and the encapsulation difficulty is big are avoided, and by means of the flexible insulating substrate body with the grooves, the problems of irregular longitudinal edges caused by a coffee-ring effect during ink printing can be solved.

The invention provides a flexible strain sensor capable of responding ultrafast, and a preparation method thereof. The method comprises the following steps: firstly performing modification processingand stretching processing on a flexible substrate surface, and then coating functionalized graphene dispersion liquid on the flexible substrate surface after stretching processing to form a functionalized graphene film; and then performing reduction processing to form a graphene sensitive layer; brushing conductive silver adhesive and adhering a conductor to obtain the flexible strain sensor capable of responding ultrafast. By performing the modification and stretching processing on the flexible substrate, the transmission of the substrate counter stress / strain wave is more sensitive; a dispersing solvent of the functionalized graphene dispersion liquid is NMP, the NMP solvent is high in boiling point and slow in evaporation, so that the coffee ring effect is obvious; a gradient stacking structure is formed through graphene wafers, and the sensing property of the graphene sensitive layer is further optimized.

The invention provides an array substrate, a preparation method, a display panel and a display device. The array substrate comprises a substrate and positive electrode layers arranged on the substratein an array, wherein the thickness of each positive electrode layer is gradually increased in the direction from the center of each positive electrode layer to the edge of each positive electrode layer in a preset distance range to the edge of each positive electrode layer. The positive electrode layers arranged on the substrate in the array are such manufactured that the thickness of each positive electrode layer is gradually increased in the direction from the center of each positive electrode layer to the edge of each positive electrode layer in the preset distance range to the edge of each positive electrode layer, and then a coffee-ring effect can be effectively avoided when a luminescent material is continuously printed on an electrode, so that a film with uniform thickness is formed, the uniformity of the printed film is improved, the flatness of the pixel film is guaranteed, the brightness for electroluminescence device illumination can be uniform, and the utilization efficiency of the material is further improved.

The invention relates to an array substrate, a preparation method thereof and a display panel, relates to the technical field of display, and aims at solving the problems of a coffee ring effect whena pixel definition layer uses a trapezoid structure and fault of a cathode layer when an inverted trapezoid structure is used. The array substrate comprises a substrate body and the pixel definition layer formed on the substrate body, the pixel definition layer divides the substrate body into sub-pixel areas, and comprises first and second definition layers arranged successively from bottom to topin a laminated way, and the lower surface of the second definition layer is wider than the upper surface of the first definition layer so that an indentation structure relative to the second definition layer is formed in the two sides of the first definition layer along the width direction. An OLED display panel is manufactured via an ink-jet printing technology according to embodiments of the invention.

Gold nano particles are synthesized. With a coffee-ring effect of a drying process of the gold nano particles and a strong hydrophobic property of polycyclic aromatic hydrocarbon (PAHs), enrichment of the PAHs on a surface of a gold substrate is achieved, and Raman characteristic peaks of six typtcal PAHs can be observed through a portable Raman spectrometer. A series of tests proves that a sample preparation method and a target pollutant analysis method in the invention are simple in operation and can achieve quick detection of the PAHs in environmental substrates.

The invention provides an ink-jet printing method for a micro-structure of a quantum dot light guide plate mesh. The printing method comprises the following steps in turn: A1) performing ink-jet printing on a light guide plate by adopting a first quantum dot ink solvent containing quantum dot ink and utilizing a coffee-ring effect to generate an annular bank structure on the surface of the light guide plate; A2) curing the bank structure; A3) printing the light guide plate by adopting a second quantum dot ink solvent containing the quantum dot ink and forming a spherical crown structure by thebank structure; and A4) curing the spherical crown structure, thereby forming a spherical crown micro-structure of the light guide plate mesh. According to the invention, the condition of three-dimensional structure collapse in a general mesh printing process can be improved, the mesh controllability can be increased and the light guiding effect of the quantum dot light guide plate is finally promoted.

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 preparation method of a controllable self-assembly gold nanorod SERS immune base. The SERS immune base includes a single-side polished silicon wafer, gold nanorods fixed on the silicon wafer polishing surface, and an antibody which is connected with the surface of the gold nanorods. The gold nanorods are firstly prepared by a double surfactant method, the gold nanorods are added dropwise on the hydrophilically-treated silicon wafer polishing surface, and a continuous self assembling structure is formed by arrangement of the gold nanorods on the silicon wafer polishing surface. In the preparation process, the silicon wafer is 35 degrees to 45 degrees slantly relative to the ground, Coffee-ring Effect can be overcome, and the self-assembly gold nanorod SERS immune base has excellent SERS immune enhancing properties and repeatability, and can be sued in high sensitivity immune detection. In addition, the preparation method of the self-assembly gold nanorod SERS immune base has the advantages of simple preparation process, low cost, less time consuming and high yield, and is easy to popularize and convenient to use.

The invention discloses a chip sintered product, a sub unit, an IGBT packaging module and a preparation method. The chip sintered product comprises a first molybdenum sheet, a second molybdenum sheetand a chip placed between the first and second molybdenum sheets; at least one of the first and second molybdenum sheets is a prefabricated molybdenum sheet; the prefabricated molybdenum sheet is a molybdenum sheet with a prefabricated nanometer silver film on the surface; in addition, at least one surface of the chip is in contact with the prefabricated nanometer silver film; by adoption of the prefabricated nanometer silver film, distribution uniformity of nanometer silver particles in the subsequent pressuring and sintering process can be improved effectively, a "coffee ring effect" can beavoided, and thermal resistance can be lowered; meanwhile, it is ensured that nano-scale holes are uniformly distributed in a sintering layer obtained by sintering, and by virtue of the nano-scale holes, stress generated between the chip and the molybdenum sheet can be lowered effectively, and the shearing strength of the chip sintered product is improved; and by adoption of the chip sintered product and the IGB packaging module with low thermal resistance and high shearing strength, the sintering layer obtained by sintering the prefabricated nanometer silver film has high compactness, and thenano-scale holes are distributed.

The application provides an ink composition which comprises nano-granules and a sublimable compound. The ink composition provided by the application contains the sublimable compound, and after removing the sublimable compound, a nano-granular film can be directly obtained so as to avoid the coffee-ring effect of the ink composition in the drying process.

The invention relates to the field of analysis detection, and concretely relates to an enhanced thin-layer chromatography-surface enhanced Raman scattering (eTLC-SERS) analysis method. The method comprises the following steps: an eTLC platform is established; a sample solution and a HCL solution are prepared; SERS activity of the eTLC platform enables in-situ detection; an expansion process of eTLC is carried out; and Raman spectrum is collected. The invention provides a novel analysis method by combining SERS enhancement and thin-layer chromatography separation, a SERS active substrate is not required for adding while detecting, influence of coffee-ring effect in a traditional method is eliminated, detection error is reduced, detection sensitivity is obviously increased, and the operation steps are simplified. For a compound which cannot position the spot after separating, the eTLC-SERS method can be employed for detecting by using a point-by-point scanning mode, compared with the traditional method, the application scope of the eTLC-SERS method is larger, and the application prospect is wider.

The invention discloses a detection method of a plasticizer phthalate based on the surface enhanced raman spectroscopy. According to the method, an Au@Ag@beta-CD material is used and mixed with to-be-detected substances, the mixture is dripped on a silicon wafer or a glass slide to form coffee-ring deposits, and a substrate with a good surface-enhanced raman effect is obtained. The coffee-ring effect can gather and concentrate the to-be-detected substances, the surface of the Au@Ag@beta-CD material is modified by cyclodextrin with a cavity structure, the to-be-detected substance can be adsorbed, the large number of to-be-detected substances can be gathered on the surface of the Au@Ag@beta-CD material, the secondary enrichment effect is generated, and the enrichment not only improves the concentration of the to-be-detected substances on the surface of the material, but also effectively distinguishes the to-be-detected substances from other substances in a solution. After enrichment, a strong raman signal is generated under the substrate, and phthalate can be qualitatively analyzed. The invention provides a method which can simply and rapidly detect phthalate (PAEs) and has low cost,high sensitivity and stable result, and the method can successfully achieve the rapid detection of PAEs in life.

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.

The invention belongs to the technical field of ink-jet printing and discloses a method for achieving an even pattern array during ink-jet printing. The method comprises the steps that a glass substrate is pretreated and then rotatably coated with a layer of polymer solution, and through ultraviolet curing, a polymer thin film is obtained; the polymer thin film and a solvent of ink for ink-jet printing in the later period are dissolved in each other; the ink for ink-jet printing is used for ink-jet printing on the polymer thin film to form an even ink droplet array, and annealing and natural cooling are conducted to obtain the even pattern array. According to the method, a layer of polymer thin film is prepared before ink-jet printing in advance, by using the coffee ring effect in the ink-jet printing process, the high-precision even pattern array can be obtained, the limit of a traditional preparation method is broken through, and the obtained pattern array has good repeatability andhomogeneity.

The invention discloses a detection method of melamine in milk and milk powder. Separation and enrichment characteristics of coffee-ring effect and high resolution detection of confocal micro-raman spectroscopy are fully combined, and a new detection method of low-concentration melamine in milk and milk powder is provided. The new detection method is simple and shortcut and has advantages of low cost and accurate result. Only by normal evaporation process, low-cost detection can be realized. The method is beneficial to large-batch low-cost rapid screening. The invention provides a new technical means for detection of melamine in milk and milk powder products.