94 results about "Colloidal photonic crystals" patented technology

The present invention discloses a widely wavelength tunable polychrome colloidal photonic crystal device whose optical Bragg diffraction stop bands and higher energy bands wavelength, width and intensity can be tuned in a continuous and fine, rapid and reversible, reproducible and predictable fashion and over a broad spectral range by a controlled expansion or contraction of the colloidal photonic lattice dimension, effected by a predetermined change in the electronic configuration of the composite material. In its preferred embodiment, the material is a composite in the form of a film or a patterned film or shape of any dimension or array of shapes of any dimension comprised of an organized array of microspheres in a matrix of a cross-linked metallopolymer network with a continuously variable redox state of charge and fluid content. The chemo-mechanical and electro-mechanical optical response of the colloidal photonic crystal-metallopolymer gel is exceptionally fast and reversible, attaining its fully swollen state from the dry shrunken state and vice versa on a sub-second time-scale. These composite materials can be inverted by removal of the constituent microspheres from the aforementioned colloidal photonic crystal metallopolymer-gel network to create a macroporous metallopolymer-gel network inverse colloidal photonic crystal film or patterned film or shape of any dimension optical Bragg diffraction stop bands and higher energy bands wavelength, width and intensity can be redox tuned in a continuous and fine, rapid and reversible, reproducible and predictable fashion and over a broad spectral range by a controlled expansion or contraction of the colloidal photonic lattice dimensions.

The invention relates to a large size full color colloid photon crystal membrane and the method for making the same. The method comprises: covering monodisperse polymer emulsion particle with hard shell-soft shell structures on the flat base material to form full color colloid photon crystal membrane after dispersion volatilizing, the model having cellular structure; the thickness of the single dispersion polyaromatics emulsion particle shell is 20-50nm, the range of the diameter of emulsion particle is 170í½300nm, and the multi dispersion index is less or equal to 0.005.

Composite materials having colloidal photonic crystals patterned in substrates for use in different technologies including lab-on-chip and photonic chip technologies. The colloidal crystals are patterned either on or within surface relief patterns in the substrates of the composite materials and each colloidal crystal exhibits Bragg diffraction.

An identification film and pattern having high transparency and a reflectance spectrum with respect to a particular wavelength and including photonic crystals patterned into a particular shape and an anticounterfeiting product including the same are disclosed.

A highly transparent colloidal photonic crystal film is easily manufactured using photocurable colloidal suspensions.

Even though a plurality of patterns (including sub-patterns) is formed in plural films, there is no reduction in optical characteristics such as transparency, reflectance spectra, and the like. Thus, a film patterned into a desired shape is manufactured and thus usability thereof is enhanced, and a plurality of reflectance spectra with various wavelength ranges is provided and thus identification capability or security is enhanced.

The invention belongs to the preparation and application technical field of a colloid photon crystal film, in particular relating to a method which adopts a spray coating method to realize simple, quick and large-area preparation of the polymer colloid photon crystal film. The method comprises the following steps that: monodisperse polymer latex particle with a hard nucleus-soft structure shell is dispersed in water at normal temperature; then, the obtained monodisperse polymer latex particle dispersion liquid is packed in a container with a common air spray gun; the spray gun is aimed at a selected leveled off base material to carry out spray coating; when the moisture in the monodisperse polymer latex particle is volatized under the action of gun body gas, a colloid photon crystal film is formed by the monodisperse polymer latex particle piling up on the surface of the base material in a face-centered cubic; and after a coated film is dried, a large area of polymer colloid photon crystal film with a photon band gap and in a visible region or an ultraviolet region can be obtained.

Disclosed is a self-assembly and preparation device of colloidal photonic crystals and the method thereof to improve the mechanical stability; the colloidal particle solution is distributed to a continuous phase and in the formation of colloidal solution droplets. Through the evaporation of the solution in the droplet, the colloidal particle in the solution is self-assembled to become the colloidal photonic crystal while the droplet is taken as a template. For the mechanical stability of the photonic crystal, the mutual cementation of the colloidal particles inside a crystal is greatly enhanced through the heat treatment. The three-dimensional colloidal photonic crystals with high mechanical stability and prepared through such a method has a potential value in the aspects of size exclusion chromatography, enzyme or zymophore, adsorption medium, bio-molecule detection carrier, filter, light switches, photonic paper and so on.

The invention discloses a preparation method of molecular colloidal photonic crystal beads. The molecular colloidal photonic crystal beads prepared through the method have the characteristics of adjustable particle size, controllable morphology, superior monodispersity and the like. The method comprises a step of constructing a three-phase micro-fluidic channel, a step of preparing a double-faced liquid drop template, a step of preparing solid-liquid coexistence Janus particles, and a step of preparing the molecular colloidal photonic crystal beads.

The present invention relates to colloidal photonic crystals using colloidal nanoparticles and a method for the preparation thereof, wherein by adding a viscoelastic material into a solution containing the colloidal nanoparticles when preparing the colloidal photonic crystals, a uniform volume contraction occurs due to the elasticity of the viscoelastic material even when a nonuniform volume contraction occurs while drying a dispersion medium in the colloidal solution. Thus, it is possible to prepare 2 or 3 dimensional colloidal photonic crystals of large scale with no defects in less time.

The invention discloses a colloid-based photonic crystal anti-fake pattern preparation method which comprises the following steps: colloid particles are dispersed in ultrapure water containing ethylene glycol to prepare colloid particle solution; then, an ink-jet printer is utilized to print the colloid particle solution on a hydrophilic substrate (3) to form a first-layer colloid photonic crystal (1), and a pattern is formed when the first-layer colloid photonic crystal is dried; the substrate with the pattern is processed into a hydrophobic substrate, the other pattern is printed through a secondary printing to form a second-layer colloid photonic crystal (2), and the two patterns are combined to obtain the colloid-based photonic crystal anti-fake pattern with the anti-fake function. When observed at different angles, the anti-fake pattern can display color variety according to different observation angles, so that the anti-fake purpose is realized.

The invention relates to a method for preparing a colloidal photon crystal composite film with humidity responsiveness and patterning by improving a humidity response speed through introducing poly (N-isopropylacrylamide). The method for preparing the colloidal photon crystal composite film comprises the following steps of: taking a mixed solution consisting of monodispersed emulsion particles, humidity responsiveness functional monomers, N-isopropylacrylamide monomers, a crosslinking agent, an initiator, a high boiling-point auxiliary and water as ink, printing the ink on the surface of a substrate with wettability in an inkjet manner, and obtaining a patterned colloidal photon crystal composite film composed of microdrop units with the humidity responsiveness, wherein the piled monodispersed emulsion particles are used as frames for the microdrop units with the humidity responsiveness, and crosslinked copolymers with the humidity responsiveness, obtained by crosslinking the humidity responsiveness functional monomers with the N-isopropylacrylamide monomers, are filled in the gaps of the frames.

The invention discloses a method for preparing a large-area non-cracking colloidal photonic crystal membrane. The method specifically comprises the following steps: dispersing water-borne polyurethane emulsion in a colloidal particle solution; then using a prepared homogeneous solution as a coating liquid, and coating a hydrophilic substrate with a large-area colloidal photonic crystal membrane in a scraping manner by utilizing a wire rod; spin-coating the surface of the colloidal photonic crystal membrane with a layer of quantum dots. Fluorescence signals of the quantum dots can be remarkably enhanced by utilizing a resonance effect of colloidal photonic crystals in a visible light region. According to the method, the defect that the traditional colloidal photonic crystal membrane is easy to crack is overcome; the method has the advantages of being simple in operation, mild in conditions, easy for large-area construction and the like; the prepared colloidal photonic crystal and quantum dot composite film has very high fluorescence intensity and fluorescence stability; an idea can be provided for preparing a high-power QD-LED device quickly.

This invention relates to a method for preparing infiltration-controllable polymer colloidal protonic crystal film and its application in waterproof coating. The method comprises: covering a flat substrate with an emulsion of mono-dispersed polymer latex particles with hard core/soft shell structure, and volatilizing the liquid to obtain the film formed from the mono-dispersed polymer latex particles. The mono-dispersed polymer latex particles with diameters of 100-300 nm can realize phase inversion at 30-90 deg.C. The thickness of the shell is 20-50 nm; while the polydispersity is lower than 0.005. The film has compact structure, and can be used as UV-resistant and waterproof color coating material.

The invention provides a photonic crystal nano-composite gel membrane with temperature/humidity dual responses. 2D colloidal photonic crystals are prepared with soap-free emulsion polymerization and needle tip flow methods, a nano-composite hydrogel pre-polymerization solution is prepared through introduction of inorganic nanoparticles as a physical crosslinking agent, finally, the 2D colloidal photonic crystals and the nano-composite hydrogel pre-polymerization solution are compounded, and the photonic crystal nano-composite gel membrane with the temperature/humidity dual responses is prepared; the photonic crystal gel membrane serving as a sensor realizes effects of fast response, high toughness and excellent optical signal resolution and achieves the purpose of rapidly detecting outsidetemperature/humidity change through color change. Preparation of the gel membrane comprises steps as follows: (1), synthesis of mono-disperse latex particles; (2), preparation of the 2D colloidal photonic crystals with the needle tip method; (3), preparation of the nano-composite hydrogel pre-polymerization solution; (4), preparation of the responsive photonic crystal nano-composite gel membrane.The preparation method is simple and convenient to operate, and the photonic crystal nano-composite gel membrane is high in color change visibility, optical signal resolution and response rate and can be applied to fast detection of temperature/humidity, metal ions, toxicants, biochemical reagents, environmental pollutants and the like.

The invention relates to the field of novel color generating material preparation, and discloses a color generating composite film. The color generating composite film is a composite optical structural material, which is formed by sequentially laminating a one dimensional film and a colloid photon crystalline film on a substrate; wherein the one dimensional film is a single layer interference filmor a one dimensional photon crystalline film. The provided color generating composite film has high brightness and high saturation, and has a potential application value in fields such as anti-counterfeiting field, display industry, paint industry, and the like.

A controllable wetted polymer colloidal photo crystal film, its production and use are disclosed. The process is carried out by adding mono-dispersed polymer colloidal particle suspension with hard-nuclear and soft-shell structure into inorganic alkali liquor, regulating pH from 6-14, coating it onto flattened substrate material at room temperature, volatilizing for dispersant, and regulating pH value and hydrophilic group to obtain the final product. It has excellent hydrophobic, hydrophilic and super-hydrophilic performances and can be used for water-proof and ultraviolet-resisting coating.

The invention provides a method for preparing a magnetic induction assembled colloidal photonic crystal with a mini-emulsion polymerization method and belongs to the technical field of functional photonic crystal materials. The method comprises the following steps: firstly, preparing ferriferrous oxide magnetic nano-particles modified by oleic acid through adopting a co-precipitation method; then, preparing polymer cladded magnetic nano-particles through three steps including pre-emulsification, fine emulsification and polymerization of the mini-emulsion polymerization method; finally, carrying out magnetic field induction assembling to obtain the colloidal photonic crystal. With the adoption of the method, a traditional method for assembling regular micro-spheres with the uniform grain diameter to form the photonic crystal is broken through and a preparation way of the photonic crystal is expanded; the preparation method provided by the invention is simple in operation flow, moderate in reaction conditions and low in cost. The assembling of the photonic crystal in the preparation method provided by the invention has the advantages of rapid speed, reversibility and simplicity; the photonic crystal has a very wide application prospect in a lot of application fields including decorative materials, coatings, thin films, sensing and the like.

A method for preparing photon crystal template in the condition of dynamic physics limit, and it belongs to the preparation area of colloid photon crystal template. The preparation steps are as follows. Evenly disperse microballoon emulsion into dissolvent, and cut the template. Adhere correspond two sides to two piece of templates, and incline the above templates between 0 degree and 90 degree angle to put into the grower. Mix the colloid microballoon emulsion and dissolvent. The flow rate of microballoon emulsion is between 0.1 cm/min to 2.0 cm/min, and the cycle time is between 18 and 40 hours. gradually slowly reduce to 0. Put the template into environmental chamber, and control its temperature between 40 Deg C and 80 Deg C and its humidity between 60% and 80%. Self assemble itself to high quality photon crystal. The method can prepare the bigger dimension firm compact opal colloid crystal template, and its arrangement height is orderly and its flaws are few. It has the characteristics of craft simple, cost low, efficiency high, and preparation template compact. It is not easy to fall off from baseplate, so it has stronger operability and repeatability.