95 results about "Colloidal photonic crystals" patented technology

Monodisperse colloidal nanocrystal clusters of magnetite (Fe3O4) with tunable sizes from about thirty to about three hundred nanometers have been synthesized using a high-temperature hydrolysis process. The colloidal nanocrystal clusters are capped with polyelectrolytes, and highly water soluble. Each cluster is composed of many single magnetite crystallites, thus retaining the superparamagnetic behavior at room temperature. The combination of superparamagnetic property, high magnetization, and high water dispersibility makes the colloidal nanocrystal clusters ideal candidates for various important biomedical applications such as drug delivery and bioseparation. The present invention is further directed to methods for forming colloidal photonic crystals from both aqueous and nonaqueous solutions of the superparamagnetic colloidal nanocrystal clusters with an external magnetic field applied thereto. The diffraction of the photonic crystals can be tuned from near infrared to visible and further ultraviolet spectral region by varying the external magnetic field.

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.

The present invention relates to photo crystal film, and is especially one kind of colloidal photon crystal film and its preparation and application in ultraviolet preventing material or cosmetics material. The colloidal photon crystal film is prepared through coating monodispersed polymer latex in hard core-soft shell structure on flat substrate and volatilizing the dispersing liquid; the obtained monodispersed polymer latex particle has shell of 20-50 nm thickness, particle size of 100-160 nm and multiple dispersion index not greater than 0.005; and colloidal photon crystal film has photon band gap in the ultraviolet region of 200-400 nm. The colloidal photon crystal film is used as the ultraviolet preventing material in cosmetics, paint, etc.

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.

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 belongs to the colloid photonic crystal preparation and application technical field, in particular to a method for preparation of high quality extensive patterning colloid photonic crystal by ink-jet printing. Under room temperature and by effective control of the substrate wetting quality and the surface tension of monodisperse emulsion particle emulsion ink for ink-jet printing, two or more types of monodisperse emulsion particle emulsion with the same particle diameter are respectively put into different ink boxes of an ink-jet printer and the concentration of the monodisperse emulsion particles in the emulsion in each ink box is 0.5-20 wt percent; and after monodisperse emulsion particle emulsion ink is used for the ink-jet printer to print patterns and then dried, a high-quality colloid photonic crystal with photon ban gaps in the ultraviolet light region and the visible light region is formed on the substrate surface. The highly-sequentially assembled colloid photonic crystals prepare by the invention has good optical property, realizes control effect of photon ban gaps to light and has wider application prospect in the fields of optical devices and optical integrated circuits.

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 gas-responsiveness mesoporous colloid photonic-crystal false-proof mark and a preparation method thereof. The gas-responsiveness mesoporous colloid photonic-crystal false-proof mark comprises a false-proof mark substrate and at least two false-proof patterns, wherein the two false-proof patterns are attached onto the surface of the false-proof mark substrate and are a first false-proof pattern and a second false-proof pattern; the first false-proof pattern and the second false-proof pattern have the same color when in normal states; the first false-proof pattern comprises a first colloid photonic crystal; the second false-proof pattern comprises a second colloid photonic crystal; the gas responsiveness of the first colloid photonic crystal is different from that of the second colloid photonic crystal. Through the adoption of the structure, the gas-responsiveness mesoporous colloid photonic-crystal false-proof mark has the advantages that the preparation cost is low; the detection mean is convenient; false-proof means are diversified; the imitation is difficult.

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 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 relates to an array type display component and a preparation method thereof, which realizes the self assembly of nano particles and the pattern step-by-step assembly of a display unit, is beneficial to realizing the large-area preparation of the display component and controlling the uniformity of a film and is easy for pattern design. Simultaneously, spherical colloid crystals are adopted, which is beneficial to decreasing a color bias generated by the change of the visual angle. The display component comprises a plurality of spherical colloid photon crystals with the same size and the diameter range of 10 microns to 1 millimeter, wherein each spherical colloid photon crystal is used as a pixel point or a pixel unit of the display component; a polymer is filled in hole gaps between the nano particles of the spherical colloid photon crystals, the back face of each spherical colloid photon crystal is connected with an electrode, the polymer generates an oxidation-reduction reaction at different voltage, a distance between the nano particles in the spherical colloid photon crystals is changed by the volume change generated when the polymer is oxidized and reduced, and the color of each spherical colloid photon crystal is accurately controlled.

The invention belongs to the technical field of preparation and application of colloid photon crystals and in particular relates to a method for preparing the self-supporting colloid photon crystal with a large area through a co-crosslinking self-assembling method. The preparation method comprises the following steps of: mixing an aqueous emulsion with monodisperse emulsion particles in a certain concentration, a polymerizable monomer, an initiator and a crosslinking agent according to a certain ratio by taking an elastic material as a self-assembling substrate, dispensing a mixture or roller painting the mixture on an elastic hydrogel substrate for co-crosslinking self-assembling, polymerizing the polymerizable monomer and the crosslinking agent in the gap among monodisperse emulsion particles in the self-assembling process, evaporating water and then drying to form a self-supporting three-dimensional colloid photon crystal film periodically arranged. The self-supporting colloid photon crystal has favorable optical performance and potential application prospects in the aspects of optical element, integrated optical circuit, sensor, and the like.

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 relates to a kind of polymer colloidal photon crystal membrane with large sized photon band-gap locate in the near-infrared area and its preparation and application. It covers the large sized monodisperse polymer latex particle emulsion on the substrate to achieve cyclical orderly arranged three-dimensional photonic crystal membrane which is spelled with the large sized monodisperse polymer latex particles in the form of face-center cube. The monodisperse polymer latex particle is achieved from the process of polymerization of numbers of the polymer latex particles with hard core-soft shell structure. The size of the monodisperse polymer latex particle ranges from 400 to 1200nm, and the polydispersity index is less than or equal to 0.005. According to the size of monodisperse polymer latex particles, the photonic band gap of the latex photonic crystal membrane can be distributed in the near infrared different band of 800~30000nm.

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.

A method for patterning self-assembled colloidal photonic crystals and a method for fabricating three-dimensional photonic crystal waveguides having an inverted-opal structure using the patterning method. The patterning method includes depositing first and second conductive films separate from each other, on an area corresponding to a pattern of the self-assembled colloidal photonic crystals that are to be formed on a substrate and on another area except for the area corresponding to the pattern, respectively, and growing the photonic crystals on the substrate on which the first and second conductive films are deposited by dip-coating in a fluid containing colloidal particles while applying a DC voltage to the respective first and second conductive films. Various types of colloidal photonic crystals can be fabricated depending on the electrode pattern defined on the substrate. Additionally, three-dimensional photonic crystal waveguides of an inverted-opal structure having a photonic band gap in all light-traveling directions can be fabricated.

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 provides a preparation method of a dynamic photonic crystal pattern for controlling a film refractive index in a wetting manner. The preparation method comprises the following steps: firstly preparing a two-dimensional photonic crystal on a transparent base material; then uniformly mixing acrylic monomers, a light sensitive agent and a cross-linking agent, obtaining a mixed solution,enabling the two-dimensional photonic crystal to contact a mixed solution, covering the transparent base material with a mask plate with patterns, curing under the ultraviolet rays, stripping a film,and obtaining a colloid photon crystal composite film which is controlled to be patterned in the wetting manner; and placing the composite film in a responsive solvent, or spraying the responsive solvent onto the composite film, and obtaining the dynamic photon crystal pattern. The polymerization degree of the reaction monomers is controlled by virtue of the mask plate, so that the wetting performance of different areas can be controlled, the refractive index of different areas can be controlled, a high bragg diffraction light appears in the film sheltered area, and the pattern is displayed in the area. The method is simple in process, the reaction condition is easy to control, and the patterning response is rapid.

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.

The invention discloses a method for manufacturing a contact lens and a method for monitoring eye pressure by using the contact lens. The method for monitoring eye pressure comprises the steps of wearing the contact lenses containing photonic crystal into eyes and monitoring the eye pressure through observation of the color of the contact lens. The contact lens contains photonic crystal; when being worn, the contact lens can represent different colors according to different eye pressures so as to monitor the eye pressure. According to the monitoring method, electronic driving and signal processing are not needed; the manufactured contact lens is simple in structure, convenient to use and low in cost; not only are new thoughts and methods for early preventing, monitoring and treating glaucoma provided, but also the current situation that the eyesight of glaucoma patients get worse and worse in China is remarkably improved; the method for monitoring eye pressure by using the contact lens has a wide application prospect in the fields of medical instruments, pharmaceutical researches and the like.

The invention belongs to the technical field of materials and particularly relates to a method for preparing gradient-controllable colloidal photonic crystal. An improved convection self-assembly method is adopted to prepare polymer colloidal photonic crystal with controllable layer number, and the colloidal photonic crystal with controllable longitudinal gradient is prepared by etching of isotropic oxygen plasmas. The whole process is simple and convenient to operate, low in consumption, clean and high in controllability, and the colloidal photonic crystal with controllable longitudinal gradient has excellent stability. Layer number of the colloidal photonic crystal is controlled by regulating concentration of microsphere dispersion solution and pulling speed, and three-dimensional colloidal photonic crystals with different dimensional gradient structures can be prepared by regulating etching power and etching time in the etching process of isotropic oxygen plasmas. The position of photonic forbidden bands can be adjusted through the gradient structure, so that the gradient-controllable colloidal photonic crystal can be used for fluorescene enhancement, sensing and the like.