310 results about "Structural coloration" patented technology

The invention discloses a color-permeable colorful ceramic and a preparation process thereof, and belongs to the technical field of ceramic preparation processes, a transparent AlON ceramic body is formed by low-temperature diffusion bonding sintering, an adjustable structural color of 480-630 nm is realized through TiO2 / ZrO2 nanocrystalline spacing (180-220 nm), a Sm2O3 chemical color is superposed, delta E is less than or equal to 0.5, and the color is changed along with the angle and does not fade; after decoration firing of a finished product, embossment line patterns can be engraved inside and outside the ceramic body through femtosecond laser, due to the fact that the main body of the ceramic body is high in light transmittance, when light directly irradiates or enters the interior from the top as a bottle, halo of the embossment line patterns engraved inside and outside can be scattered on the surface, and the overall optical effect is improved; the ceramic is suitable for high-grade decorative ceramics such as bottles and ornaments.

The invention discloses a SiO2 / CNC multi-optical characteristic composite film and a resin packaging preparation method, and the preparation method comprises the steps: firstly, preparing a SiO2 photonic crystal film based on polydisperse nano silicon dioxide of which the particle size is in specific normal distribution; and jointly assembling the rolled CNC photon microchip, polydisperse SiO2 with the particle size in specific normal distribution and a toughening material. According to the method, the brittleness of a CNC chiral photon film is utilized, and the chiral photon microchip which is unique in shape, gorgeous in structural color, gorgeous in circular dichroism and fine in fingerprint texture texture is prepared through rolling treatment. According to the combination mode, the influence of all components in the SiO2 system on the CNC film-forming property, the screw pitch controllability and the structural uniformity is eliminated, and finally the SiO2 / CNC composite film with multiple optical characteristics and excellent mechanical properties is obtained.

The present invention belongs to the technical field of polymer composite material preparation and discloses a double-layer hollow structure photonic gel film with controllable water permeation and color change, as well as its preparation method and application. The method comprises the following steps: preparing a three-dimensional PS-SiO2 photonic crystal and a three-dimensional SiO2 photonic crystal; calcining the three-dimensional PS-SiO2 photonic crystal at high temperature, filling the crystal with a polymer, and curing the crystal with ultraviolet light to obtain a hollow SiO2 structural color gel; curing the three-dimensional SiO2 photonic crystal with a polymer, and then etching the crystal with hydrofluoric acid to obtain an inverse opal gel; and bonding the hollow SiO2 structural color gel and the inverse opal gel to form a double-layer hollow structure photonic gel film with controllable water permeation and color change. The photonic gel film can be used in snowmelt warning indicators at large ski resorts, portable alcohol solubility detectors, or anti-counterfeiting identification labels for small commercial packaging.

The invention provides a polarization selectivity all-dielectric high-saturation structural color metasurface with a maintainable color center. The metasurface sequentially comprises a SiO2 semi-ellipsoid layer, a GaN elliptic cylinder array and a PDMS flexible substrate from top to bottom, wherein the SiO2 semi-ellipsoid layer and the GaN elliptic cylinder array form a periodically arranged double-layer all-dielectric nanostructure unit. Under the condition of x polarization incidence, the structure generates a narrow-band high-reflection structural color in a visible light wave band, the full width at half maximum of a main reflection peak is about 9 nm, the peak reflectivity can reach 99.8% or above, and the reflectivity of a secondary reflection peak on the short wave side is lower than 0.01; and under the y polarization incidence condition orthogonal to the light source, the reflectivity near the corresponding wavelength is lower than 2%, and the light source shows remarkable polarization selectivity. The inventor further finds that when the equivalent radius change of the nano unit causes the reduction of the reflection efficiency, the reflectivity of the main peak can be recovered by adjusting the long-short axis ratio of the GaN elliptic cylinder and the SiO2 semi-ellipsoid, and the central wavelength of the main formant is basically kept unchanged, so that the brightness adjustment is realized on the premise that the color center is basically constant. The structure is suitable for flexible or wearable optical devices, polarization-related structural color display and other applications.

The invention relates to the technical field of optical elements, in particular to a structural color regulation and control device based on silicon nitride metasurface continuous domain bound state enhancement, which comprises a substrate and a metasurface structure arranged on the substrate, the substrate is a silicon dioxide substrate, and the metasurface structure is composed of a plurality of nano-disks which are periodically arranged in a two-dimensional manner. And a circular air hole is formed in the nano plate. Based on the narrow linewidth resonance characteristic of the quasi-BIC, the structural color with high saturation and wide color gamut is realized; by utilizing strong polarization dependence, passive and dynamic regulation and control of color brightness can be realized through simple polarization rotation, and the structure does not need to be changed; silicon nitride has extremely low loss in a visible light band, good compatibility with a silicon dioxide substrate and a stable structure; a high-contrast polarization encryption pattern is easy to realize, and the application prospect in the fields of high-end anti-counterfeiting, information storage, dynamic display and the like is wide; the adopted micro-nano processing technology is standard and mature, and practical preparation and industrialization of the device are facilitated.

The invention discloses a liquid crystal structural color holographic film, a preparation method thereof and a color holographic device. The liquid crystal structural color holographic film comprises a nematic phase liquid crystal layer and a cholesteric phase liquid crystal layer which are arranged in a stacked mode, the total thickness of the nematic phase liquid crystal layer and the cholesteric phase liquid crystal layer is fixed, and a completely polymerized liquid crystal polymer network is formed. The cholesteric liquid crystal layer comprises a plurality of structural color areas, and in the different structural color areas, the spiral structure of the cholesteric liquid crystal layer has different screw pitches so as to reflect light of different colors; the cholesteric liquid crystal layer is provided with a patterned surface orientation structure, the surface orientation structure is obtained through optimization according to a color holographic algorithm, and the orientation structures of different structural color areas independently encode phase holograms of different wavelength channels. The liquid crystal structural color holographic film provided by the invention can display a structural color pattern in a near field and an independent color holographic image in a far field, so that light regulation and control of near-far field and wavelength combined multiplexing are realized, and the multiplexing dimension and functionality of a flexible optical element are improved.

The invention discloses an intelligent fabric with a non-iridescent structural color and a temperature adjusting function and a preparation method of the intelligent fabric, and belongs to the technical field of fabric materials. The photon nano pigment is loaded on the matrix fabric, is a hollow silicon dioxide nanosphere with a disordered metasurface and an inner wall carbon layer, and can generate a non-iridescent structural color without being assembled; the phase-change material is lauric acid, and the phase-change material absorbs or releases latent heat through solid-liquid phase change so as to realize temperature regulation; the molten lauric acid after phase change is adsorbed on the surfaces of the hollow silicon dioxide nanospheres and forms hydrogen bond crosslinking with oxygen anions on the surfaces of the hollow silicon dioxide; the water-based acrylic resin is used as an adhesive to fix the photon nano pigment and the phase-change material, and forms hydrogen bond crosslinking with the molten lauric acid to prevent leakage of the phase-change material. The intelligent fabric disclosed by the invention can present a non-iridescent structural color without being assembled, and the temperature can be adjusted by absorbing and releasing heat energy.

The invention relates to the technical field of tool surface functional coatings, in particular to a wear self-monitoring superhard wear-resistant gradient reinforced coating and a preparation method thereof.The coating comprises a metal substrate, a high-entropy wear-resistant layer, a color layer and a transition layer, and the outer layer is a top high-entropy wear-resistant layer; the high-entropy wear-resistant layer is composed of Ti / Al / Zr / Si / Mo-N, and the hardness gradient of the high-entropy wear-resistant layer is 35-55 GPa; the color layer is of an AlTiN / Si (Ti) double-layer structure and has a multicolor structural color, and the hardness of the color layer is 20-35 GPa; the transition layer is a component gradient system. The preparation method adopts multi-target magnetron sputtering, and comprises the steps of substrate pretreatment, layered deposition (wear-resistant layer / color layer / transition layer), top layer deposition and vacuum cooling. By means of the design, the problems that an existing coating lacks self-monitoring, the hardness gradient is narrow, and interlayer stripping is prone to occurring are solved, abrasion visual monitoring is achieved, super-hard abrasion resistance and high binding force (larger than or equal to 85 N) are achieved, different cutting working conditions are adapted, and the service life of a cutter is greatly prolonged.

The invention discloses a preparation method and application of a high-sensitivity temperature-responsive cellulose-based structural color material, and belongs to the field of functional polymer materials. The preparation method comprises the following steps: adding an isopropanol solvent into a certain volume of aqueous solution to obtain an isopropanol dilute solution; hydroxypropyl cellulose is dissolved in an isopropanol dilute solution, a cholesteric liquid crystal structure is formed through self-assembly, a bright structural color is presented, and the hydroxy propyl cellulose structural color material is prepared. A hydroxy propyl cellulose structural color material is uniformly coated on the surface of a polydimethylsiloxane film containing carbon nanotubes, then the transparent polydimethylsiloxane film is used for sealing the hydroxy propyl cellulose structural color material, the temperature sensor with the visual structural color is prepared, and the temperature sensor with the visual structural color is attached to the skin of the human body and can display different colors along with temperature changes. The prepared structural color material is sensitive in response to temperature stimulation, rapid in color change and suitable for human body visual real-time temperature monitoring in the field of intelligent sensing.

The invention provides a high-purity structural color device based on a metasurface and a color developing method, and relates to the technical field of structural color metasurface, the structural color device is a double-layer nanoring array based on an all-dielectric metasurface, adopts an optical design based on Fabry-Perot interference and Mie resonance, and comprises a plurality of structural units, the structure unit comprises a vertical stacking double-layer circular ring structure formed by a tantalum pentoxide Ta2O5 functional layer and a silicon dioxide SiO2 top cover layer, and has sub-wavelength periodic two-dimensional arrangement; through the technical path of the invention, a structural color solution with high purity, wide color gamut and high reflection is provided by utilizing the wide band gap characteristic and high-quality manufacturing capability of Ta2O5. The application scenarios include but are not limited to high-end displays, optical sensors, information encryption and precision optical elements, and brand new possibility is provided for development of the next generation of photonics technology.

There is provided a display device including a film including a layer that selectively reflects at least a part of light in a wavelength range of 380 nm to 780 nm to exhibit a structural color, and a micro LED display.

The present invention relates to a photonic crystal coating, a preparation method, and its application, belonging to the technical field of photonic crystal structure color generation. The photonic crystal coating comprises the following components, measured in parts by weight: 100 parts of a hard-core-soft-shell nanosphere dispersion, 1 to 8 parts of a leveling agent, 0.1 to 0.4 parts of a stray light absorber, and 0 to 6 parts of a high-boiling-point additive. The photonic crystal coating is directly prepared from hard-core-soft-shell colloidal nanospheres. The resulting structural color coating exhibits excellent structural stability (associated with high color fastness), high color saturation, and a significant iridescent effect.

The invention provides a colored radiation refrigeration coating as well as a preparation method and application thereof, and belongs to the technical field of building materials. The preparation method comprises the following steps: carrying out self-assembly on a sulfonated cellulose nanocrystal aqueous solution to obtain a colored film; sequentially carrying out heat treatment and crushing on the colored film to obtain structural color particles; mixing the structural color particles with resin to obtain a mixture; and coating a reflecting layer with the mixture to obtain the colored radiation refrigeration coating. According to the colored radiation refrigeration coating and the preparation method thereof, the sulfonated cellulose nanocrystals form an expandable colored coating in a manner of crushing and mixing with resin, so that the problem of brittleness of the cellulose nanocrystals in use is solved, and the obtained colored radiation refrigeration coating can reduce the refrigeration energy consumption in a building use process in summer. The reflectivity of the prepared colored radiation refrigeration coating is 90-93%, the emissivity of the prepared colored radiation refrigeration coating is 87-92%, and a radiation refrigeration effect can be achieved.

The invention relates to the technical field of optical anti-forgery, in particular to optical anti-forgery ink and a preparation method and application thereof.The optical anti-forgery ink comprises pigment and a curable gloss oil mixture, the pigment comprises magnetic photonic crystal optically variable pigment and flaky magnetic optically variable pigment, the pigment is uniformly dispersed in the curable gloss oil mixture. According to the optical anti-counterfeiting ink disclosed by the invention, by mixing the magnetic photonic crystal optically variable pigment and the flaky magnetic optically variable pigment, the overall brightness of an anti-counterfeiting pattern is ensured, and the structural color of the photonic crystal can be well presented, so that the overall pattern also has relatively high resolution and finer color, and has a higher anti-counterfeiting effect. An optical anti-counterfeiting pattern printed by adopting the optical anti-counterfeiting ink disclosed by the invention has a relatively high resolution, a finer color and a higher-grade anti-counterfeiting effect, and in addition, the anti-counterfeiting pattern has different colors and shapes under different visual angles, so that the optical anti-counterfeiting ink has a higher-grade anti-counterfeiting effect.

The invention discloses a high-refractive-index-difference bottle brush block polymer and a synthetic method of a degradable structural color material, and belongs to the technical field of organic polymers. The end group of the high-refractive-index degradable macromonomer is a cycloolefin derivative capable of performing sequential ring-opening metathesis polymerization reaction (ROMP), and the main chain is a degradable polymer prepared by performing ring-opening copolymerization reaction on styrene oxide (SO) and a comonomer. A series of novel degradable cycloolefin macromonomers are designed and synthesized to replace polystyrene and other non-degradable high-refractive-index polymers commonly used in the field, and the macromonomers and a block copolymer brush are synthesized through ring-opening polymerization and ring-opening metathesis polymerization. And an environment-friendly structural color material capable of covering a full visible light wave band is further prepared by utilizing a phase separation mechanism.

A method is for forming a radiation shield around an object. The method includes providing an inorganic paint pigment comprising a fluid matrix, and paint flakes carried within the fluid matrix. Each paint flake includes a common aluminum mirror layer having a first major surface and a second major surface opposing the first major surface, a first plasmonic aluminum reflector layer carried by the first major surface, and a second plasmonic aluminum reflector layer carried by the second major surface. The method also includes coating an outer surface of the object with the inorganic paint pigment.

The present application relates to the field of multi-modal chiral structural color anti-counterfeiting, and provides a multi-modal micro-scale dome chiral structural color anti-counterfeiting label, a preparation method and application thereof.The multi-modal micro-scale dome chiral structural color anti-counterfeiting label is prepared from a transparent material and has a micro-scale dome structure on the surface, the label pattern can be customized, and the chroma, brightness, chirality and polarization of the pattern color can be programmed and regulated according to requirements.The preparation method of the multi-modal micro-scale dome chiral structural color anti-counterfeiting label is simple, universal, low in cost and suitable for large-scale production.

The application discloses a structural color pressure-sensitive film based on a hollow polymer colloidal photonic crystal and a preparation method and application thereof, and belongs to the technical field of force-induced color-changing materials. The preparation method of the structural color pressure-sensitive film comprises the following steps: (1) uniformly dispersing core-shell nano colloidal particles in an organic solvent to obtain a colloidal particle dispersion liquid; the shell layer of the core-shell nano colloidal particles is a polymer material, and the core layer is an inorganic oxide; (2) coating the colloidal particle dispersion liquid on the surface of a flexible substrate, and obtaining a precursor photonic crystal film after heating; and after removing the core layer of the core-shell nano colloidal particles in the precursor photonic crystal film by acid treatment etching, the structural color pressure-sensitive film is obtained. The preparation method of the structural color pressure-sensitive film is simple, the conditions are mild, and no pigment dye molecules are needed; by utilizing the pressure deformation and shape memory characteristics of a single hollow polymer colloidal particle itself and the inherent structural color characteristics of a photonic crystal, the structural color pressure-sensitive film can realize the regulation and memory of rich and high-saturation structural colors under the action of pressure.

The invention belongs to the technical field of reflective display, and particularly provides a dynamic display screen with an adjustable structural color and a display method thereof.The dynamic display screen comprises a transparent front panel, a controllable flexible material array, a driving electrode array and a substrate which are sequentially arranged from top to bottom; wherein the controllable flexible material array comprises a plurality of flexible structures which are distributed in an array; a plurality of continuous micro grooves are formed in the surface of the flexible structure; the driving electrode array is connected with an external driver and used for driving the flexible structure to extend or shorten in the arrangement direction of the multiple micro-grooves so as to change the distance between the adjacent micro-grooves. According to the invention, by adjusting the distance between the adjacent micro grooves in the flexible structure, the dynamic change of colors is realized, and low power consumption, high outdoor readability and good visual comfort are achieved. A physical structural color principle is utilized, a backlight source is not needed, energy consumption is remarkably reduced, and meanwhile damage to eyes caused by blue light radiation of a traditional displayer is avoided.

This application discloses a method for achieving structural color patterning of a double-layer system by regulating the wrinkles of a double-layer system through inorganic salt inkjet printing, which relates to the field of optical information patterning technology. The method comprises: stirring and mixing polydimethylsiloxane and a curing agent in a mass ratio of 10:1, centrifuging, and curing at 60°C for 8 hours to obtain a cured polydimethylsiloxane; spin-coating a PVA solution on a substrate at a rotation speed of 500-9500 rpm to obtain a double-layer system; inkjet printing an inorganic salt solution on the double-layer system to obtain a double-layer system printed with an inkjet pattern; and sequentially stretching and releasing the double-layer system printed with the inkjet pattern to form a structural color pattern. In this way, the technology for achieving structural color patterning does not require the substrate itself, but only requires spin coating and inkjet printing on the substrate. The structural color patterning method is simple to operate, practical, low-cost, and also convenient for large-scale production. The pattern acquisition conditions are simple, requiring only stretching and release.

The invention discloses a construction method of an aptamer modified photonic crystal sensor for visually detecting oxytetracycline, and belongs to the technical field of sensing. In the invention, a photonic crystal array obtained by a vertical evaporation self-assembly method is combined with polyacrylamide hydrogel to form the photonic crystal hydrogel membrane material. Gold nanoparticles serve as a bridge, one side of each gold nanoparticle is connected with an amide framework of the hydrogel through chelation, the other side of each gold nanoparticle is connected with the oxytetracycline aptamer through covalent bonding, and the aptamer modified photonic crystal sensor is constructed. The oxytetracycline aptamer and oxytetracycline are highly selectively combined through pi-pi stacking and hydrogen bonds, so that the hydrogel swells, the lattice spacing of the photonic crystal is increased, a reflected signal and a structural color are subjected to red shift, and high-selectivity detection of the oxytetracycline is realized. The rapid detection requirements in the fields of food safety, environment monitoring, biological medicine and the like are met. The linear range of oxytetracycline detection is 0.1 mu g / mL-80 mu g / mL, and the lowest detection limit is 0.033 mu g / mL.

The present invention discloses a yellow-and-white structural colored glaze, and its preparation and application methods. The raw material formula of the structural colored glaze is composed, by weight, of 28-33% glaze fruit, 40-44% borax, 9-15% bone ash, 5-7% glaze ash, 1-3% quartz, 1-3% lepidolite, 2-3% bentonite, 1-2% ultrafine alumina powder, 2-4% cerium oxide, and 0.2-0.4% sodium carboxymethyl cellulose. The ingredients are prepared, mixed, ball-milled, sieved, stirred, glazed, fired, and cooled to obtain the yellow-and-white structural colored glaze. The present invention achieves the artistic effect of the yellow-and-white structural colored glaze by improving the glaze formulation and firing method, precisely controlling the size of the phase-separated droplets. Furthermore, the preparation method is simple, inexpensive, and easy to use, and therefore has broad market prospects.

A cosmetic composition having a pearlescent effect, according to one aspect, provides a pearlescent effect without a pearlescent pigment so as to improve aesthetics, can be used in various formulations such as low-viscosity skin formulations, can exhibit structural colors, and has excellent long-term formulation stability.

The application provides a preparation method of a security label and the security label, and the preparation method comprises: sequentially forming a first security structure and a second security structure in a laminated arrangement on a surface of a substrate, forming the first security structure comprises forming a perovskite film on the surface of the substrate, the perovskite film can be irradiated by a first light beam to present a first preset pattern, and forming the second security structure comprises forming a structural color film on a side of the perovskite film away from the substrate, the structural color film can be irradiated by a second light beam to present a second preset pattern. Wherein, the structural color film is formed by irradiation light sequentially irradiating through a first mask plate and a second mask plate, a mask pattern of the first mask plate is the same as the second preset pattern, and the second mask plate is a first-pitch grating, so that the structural color film presents a microarray structure, based on the microarray structure, the structural color pattern and the fluorescent pattern can be selectively hidden and displayed, and then information encryption of the security structure is realized.

The invention relates to a method for preparing a structural color pattern by using a melanin photon material, and belongs to the technical field of structural colors. The method comprises the following steps: S1, under an alkaline condition, carrying out a reaction on PS microspheres and dopamine hydrochloride in a tris (hydroxymethyl) aminomethane-hydrochloric acid buffer solution, and centrifuging to obtain PS (at) PDA microspheres; s2, the PS (at) PDA microspheres are prepared into PS (at) PDA microsphere dispersion liquid, the PS (at) PDA microsphere dispersion liquid is dropwise added to the surface of a silica gel plate, and PS (at) PDA structural color pellets are obtained through drying treatment; and S3, the PS-coated PDA structural color pellets are prepared into PS-coated PDA structural color pellet dispersion liquid, atomization deposition is conducted through a mask technology, and a structural color pattern is obtained. By regulating and controlling the particle size of the PS microspheres and the thickness of the PDA shell layer, the structural color material with uniform color and high color visibility and saturation can be prepared, and finally the preparation of the full-chromatographic structural color covering the whole visible spectrum area is realized.

The present invention belongs to the field of textile structural coloration, and particularly relates to a non-densely packed photonic crystal structure color-forming fabric and its preparation method. The method comprises the following steps: S1 constructing an assembly working fluid, S2 applying the assembly working fluid and completing assembly: uniformly applying the assembly working fluid to the fabric surface, and assembling at a temperature of 50-80°C for 2-10 minutes. When the apparent moisture completely evaporates, the assembly is completed; S3 a water removal step, and S4 a brightening step. The brightening treatment process conditions are a temperature of 110-140°C and a time of 2-10 minutes. The present invention realizes the rapid and large-scale preparation of non-densely packed photonic crystal structure color-forming fabrics by constructing an assembly working fluid, applying the assembly working fluid to the fabric surface, and then performing a three-stage process of assembly, sufficient water removal, and brightening.

The application discloses a preparation method of a three-dimensional ordered metal oxide inverse opal photonic crystal film. The method comprises the following steps: mixing polystyrene microspheres and corresponding solvents in proportion to obtain a microsphere emulsion for standby; under constant temperature environment conditions, a vertical deposition self-assembly method is adopted to obtain a large-area ordered photonic crystal template on a substrate, wherein by adjusting the mass of glycerol, the cracking phenomenon of the template can be reduced; on the basis of the photonic crystal template, a metal precursor solution is filled into the template pores, the template microspheres are removed, and finally an inverse opal photonic crystal film containing periodically arranged holes is obtained. The application can be used for the preparation of templates and inverse opals of all sizes of PS balls. The prepared photonic crystal template has the advantages of few structural defects, high ordered arrangement, low method cost, high repeatability and strong applicability, and the prepared high-quality photonic crystal film has stable structural color.

The utility model discloses a shell based on a structural color coating, which comprises a light-transmitting plastic base material, the structural color coating and a texture layer are sequentially laminated on the upper surface of the light-transmitting plastic base material, and an ink layer is arranged on the lower surface of the light-transmitting plastic base material or the texture layer; the structural color coating is evenly provided with three-dimensional photonic crystals used for reflecting visible light, and the thickness of the structural color coating is 5-30 microns. Under a fixed angle, the three-dimensional photonic crystal can reflect incident light with a specific wavelength in visible light, so that the color generation purity of the shell is high. The wavelength ranges of reflected light of the three-dimensional photonic crystal at different angles are different, so that the multicolor gradual change effect can be achieved when the shell is observed at different angles. And meanwhile, the reflected light of the three-dimensional photonic crystal is interfered with the reflected light of the texture layer, so that the reflected light effect of the shell is complex and diversified, and the surface texture of the shell also has a colorful light effect.

The invention discloses a color structured light 3D camera using a coaxial light path and a calibration method thereof, and relates to the field of structured light cameras, the color structured light 3D camera comprises a camera body arranged right above a measured object, and an imaging structure, a color modulation structure and an embedded processing chip are integrated in the camera body. Compared with an existing structured light 3D camera, the structure light 3D camera has the advantages that the parallax error caused by inclined installation is eliminated by adopting the camera upright layout, and the spatial positioning precision of 2D color information is improved; through a coaxial optical path design, optical path multiplexing of a structured optical channel and a color channel is realized on the premise of not increasing the size of equipment; a CMOS monochromatic high-speed sensor is selected, the problem of resolution loss caused by three-channel information interpolation of a Bayer array sensor is avoided, and meanwhile high-precision collection of color information is achieved through time-sharing exposure.

The present invention belongs to the technical field of hydrogel preparation, and specifically relates to a force-induced color-changing nanocomposite hydrogel, its preparation method and application. The force-induced color-changing nanocomposite hydrogel is composed of covalently cross-linked polyacrylamide and rod-shaped cellulose nanocrystals. Among them, polyacrylamide forms a gel matrix with a cross-linked network structure, and the rod-shaped cellulose nanocrystals are interspersed in the gel matrix and arranged in a chiral nematic structure; the pitch is 1.9 - 3.0 μm; the nanocomposite hydrogel is colorless and transparent under a pressure < 150 kPa, and under a pressure ≥ 150 kPa, the nanocomposite hydrogel presents visible structural colors. Compared with the current sensitive hydrogels, the nanocomposite hydrogel needs to be under the action of at least 150 kPa of pressure to present structural colors, which can meet the requirements of some special pressure sensing fields.