Mesoporous substrate seepage-guided colloid self-assembly collaborative printing cross-scale micro-nano manufacturing method

Abstract

The invention provides a mesoporous substrate seepage-guided colloid self-assembly collaborative printing cross-scale micro-nano manufacturing method, which comprises the following steps: placing an open container containing colloid suspension in a closed environment for slow evaporation, and forming a mesoporous substrate with a flat surface in the container; a mesoporous base material is used as a substrate, colloidal suspension liquid is injected / jetted onto the substrate, colloidal liquid drops are rapidly spread and strongly imbibed by the substrate, so that colloidal particles in the liquid are induced to be rapidly assembled on the surface of the substrate, and finally an ordered colloidal photonic crystal structure is formed. The technology of combining the mesoporous base material with printing technologies such as slit coating, ink-jet printing and direct writing printing is utilized to realize ultrafast self-assembly of colloidal particles on the surface of the mesoporous base material, and the large-area patterned colloidal photonic crystal is obtained. The method is simple in process, more importantly, efficient, rapid and cross-scale preparation of the patterned colloid photonic crystal can be achieved, and the preparation time is shortened by two orders of magnitude on the premise that the quality of a colloid assembly is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the field of printed optoelectronics and micro-nano manufacturing, and specifically relates to a mesoporous substrate seepage-guided colloid self-assembly collaborative printing cross-scale micro-nano manufacturing method. Background Art

[0002] Photonic crystals have broad application prospects in the fields of sensors, encryption and anti-counterfeiting, and new displays. In particular, surface-enhanced Raman scattering based on photonic crystal materials has important applications in the field of biochemical analysis and detection. Self-assembly based on colloidal particles is an economical, simple and effective method for preparing ordered photonic crystal materials from the bottom up. In the past, scientists have developed a variety of technical colloidal self-assembly techniques such as Langmuir-Blodgett (LB), spin coating, vertical deposition, gravity sedimentation, and evaporation-induced self-assembly to achieve the effective preparation of colloidal photonic crystals. However, most self-assembly methods are inefficient, resulting in an irreconcilable contradiction between the quality of photonic crystals and the efficiency of assembly, making it difficult to achieve rapid and efficient self-assembly manufacturing of colloidal photonic crystals. In addition, most self-assembly methods rely on templates, making it difficult to prepare patterned colloidal crystals. Summary of the invention

[0003] In order to overcome the shortcomings of existing template method, vertical deposition method, evaporation self-assembly method and other technologies for the preparation of colloidal photonic crystals, the present invention provides a mesoporous substrate seepage-guided colloidal self-assembly collaborative printing cross-scale micro-nano manufacturing method, which utilizes a combination of mesoporous substrate and slit coating, inkjet printing, direct writing printing and other printing technologies to achieve ultrafast self-assembly of colloidal particles on the surface of the mesoporous substrate to obtain large-area, patterned colloidal photonic crystals, and can achieve simple, efficient, rapid, digital, cross-scale micro-nano manufacturing of ordered colloidal photonic crystal structures.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] The cross-scale micro-nano manufacturing method of colloidal self-assembly and collaborative printing guided by mesoporous substrate percolation comprises the following steps:

[0006] Step 1: placing a container containing a nano-colloid suspension in a closed environment to evaporate slowly, thereby forming a mesoporous substrate with a smooth surface in the container;

[0007] Step 2: using the mesoporous substrate obtained in step 1 as a substrate, injecting and spreading the colloidal suspension on the mesoporous substrate, and the colloidal particles will quickly self-assemble under the seepage effect of the mesoporous substrate to form an ordered colloidal photonic crystal structure;

[0008] Alternatively, the mesoporous substrate obtained in step 1 is used as a printing substrate, and the colloidal suspension is used as a printing ink system, which is combined with a slit coating printing technology to quickly manufacture a large-area colloidal photonic crystal structure;

[0009] Alternatively, the mesoporous substrate obtained in step 1 is used as a printing substrate, and the colloidal suspension is used as a printing ink system, which is combined with an inkjet printing patterning manufacturing technology to achieve rapid micro-nano manufacturing of patterned colloidal photonic crystals;

[0010] Alternatively, the mesoporous substrate obtained in step 1 is used as a printing substrate, and the colloidal suspension is used as a printing ink system, which is combined with ink direct writing printing technology to achieve micro-nano manufacturing of patterned colloidal photonic crystals.

[0011] Furthermore, the nano-colloid suspension in step 1 is selected from a silica colloidal suspension, the mass fraction of the suspension is 30 wt %, and the diameter of the silica particles is 12 nm.

[0012] Furthermore, the container in step 1 is a disposable plastic culture dish, and the nano-colloid suspension is injected into the culture dish; and the closed environment is a sealed box.

[0013] Furthermore, in step 1, the culture dish containing the colloidal silica suspension is placed in a closed room temperature environment for slow evaporation for 2 days to form a mesoporous substrate in the culture dish.

[0014] Furthermore, the printing ink system in step 2 is a low-viscosity colloidal suspension system formed by colloidal microspheres and a dispersant, and the colloidal microspheres are polystyrene (PS) microspheres, silica microspheres, and gold / silver nanoparticle-coated PS microspheres; the size of the colloidal microspheres is 100 nm to 10 μm.

[0015] Furthermore, in step 2, before the printing ink system is loaded into the inkjet printer cartridge, the colloidal suspension is diluted 2 to 10 times with ultrapure water, and then ultrasonically stirred for 1 minute to ensure uniform dispersion of the particles.

[0016] Furthermore, droplets of the printing ink system come into contact with the surface of the mesoporous substrate through a jetting process, and colloidal particles in the ink rapidly self-assemble on the surface of the mesoporous substrate to form a colloidal photonic crystal structure.

[0017] Furthermore, the inkjet printing patterning manufacturing technology in step 2 is implemented using a microelectronic inkjet printer;

[0018] The mesoporous substrate is used as a printing substrate and is placed on a sample displacement stage of an inkjet printer;

[0019] The configured printing ink system is loaded into an inkjet printer cartridge, and through the inkjet process, the colloidal suspension ink droplets are generated, fly, and deposited on the mesoporous substrate;

[0020] When the ink droplets of the printing ink system contact the mesoporous substrate, they spread rapidly and form a strong percolation effect of the mesoporous substrate, thereby inducing the colloidal particles in the ink droplets to assemble rapidly on the substrate surface and quickly form an ordered colloidal photonic crystal structure;

[0021] By digitally controlling the ink droplets of the massive printing ink system through the nozzle, the massive ink droplets can quickly form patterned colloidal photonic crystals at different positions of the mesoporous substrate according to different time sequences.

[0022] Furthermore, the ink direct writing printing technology in step 2 is implemented by using a dispensing machine, including:

[0023] Place the mesoporous substrate on the XY plane of the mobile platform of the dispensing machine;

[0024] Add the prepared colloidal suspension into the dispensing syringe, and install the dispensing syringe on the Z axis of the dispensing machine; the outlet end of the dispensing syringe is connected to a needle of changeable thickness, and the needle is treated with hydrophobicity; the other end of the dispensing syringe is connected to a precision pressure regulating valve through a gas pipeline, and the precision pressure regulating valve is connected to a pressure tank storing compressed gas, and the compressed gas flowing from the pressure tank into the gas pipeline squeezes the colloidal suspension out of the needle;

[0025] The pressure in the gas pipeline is controlled by a precision pressure regulating valve, thereby controlling the discharge process of the colloidal suspension from the needle;

[0026] Set the printing pattern, start printing, and the colloidal suspension flows out continuously from the dispensing needle;

[0027] When the dispensing needle and the mesoporous substrate move relative to each other, the colloidal particles self-assemble on the surface of the mesoporous substrate to form patterned colloidal photonic crystals.

[0028] Beneficial effects:

[0029] The present invention provides a new colloidal self-assembly micro-nano manufacturing technology, that is, the micro-nano manufacturing of rapid self-assembly and ordered structures is achieved by guiding colloidal particles through the percolation of a mesoporous substrate, and can be combined with existing printing technology to achieve the manufacture of large-area, patterned photonic crystals. The present invention has a simple process, and more importantly, it can achieve efficient and rapid preparation of patterned colloidal photonic crystals. Compared with the existing technology, the preparation time is shortened by two orders of magnitude while ensuring the assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the process of colloidal self-assembly induced by percolation on mesoporous substrates;

[0031] Figure 2 Schematic diagram of the mesoporous substrate percolation self-assembly collaborative inkjet printing process;

[0032] Figure 3 It is the percolation self-assembly process of printing colloidal ink droplets on the mesoporous substrate;

[0033] Figure 4 SEM image of a single-layer colloidal photonic crystal prepared by self-assembly of polystyrene microspheres guided by percolation on a mesoporous substrate;

[0034] Figure 5 Microscopic image of a large-area monolayer colloidal crystal structure assembled on a mesoporous substrate;

[0035] Figure 6 Schematic diagram of the collaborative direct writing printing of mesoporous substrate percolation self-assembly. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] The embodiment of the present invention provides a mesoporous substrate percolation-guided colloidal photonic crystal self-assembly and inkjet printing micro-nano manufacturing method, comprising the following steps:

[0038] Step 1: placing a culture dish containing the nano-colloid suspension in a closed environment (such as a sealed box) for slow evaporation, and after about 2 days, a mesoporous substrate with a smooth surface is formed in the culture dish;

[0039] Step 2: Using the mesoporous substrate obtained in step 1 as a substrate, injecting the colloidal suspension system onto the substrate, the colloidal droplets spread rapidly and are strongly absorbed by the substrate, thereby driving the particles in the droplets to assemble rapidly on the surface of the substrate, and finally forming an ordered colloidal crystal structure;

[0040] Alternatively, the mesoporous substrate obtained in step 1 is used as the printing substrate, and the colloidal suspension system is used as the coating liquid. Under a certain pressure and flow rate, it is squeezed and sprayed along the gap of the coating mold and transferred to the mesoporous substrate. As the coating mold moves accurately relative to the mesoporous substrate, the colloidal particles self-assemble on the surface of the mesoporous substrate to form a large-area colloidal photonic crystal ordered structure, such as Figure 1 As shown;

[0041] Alternatively, the mesoporous substrate obtained in step 1 is used with inkjet printing technology, that is, the mesoporous substrate is used as the printing substrate, the colloidal suspension system is used as the printing ink, and the colloidal suspension ink droplets are sprayed and deposited on the mesoporous substrate, and the colloidal particles of a single ink droplet are self-assembled and deposited by the following method: the mesoporous substrate obtained in step 1 is used as the substrate, the colloidal suspension system is injected onto the substrate, the colloidal droplets spread rapidly, and are strongly absorbed by the substrate, thereby driving the particles in the droplets to assemble rapidly on the substrate surface, and finally forming an ordered colloidal crystal structure; combined with digital on-demand inkjet manufacturing, rapid printing of patterned colloidal photonic crystals can be achieved, such as Figure 2 As shown;

[0042] Alternatively, the mesoporous substrate obtained in step 1 is used with ink direct writing printing technology, i.e., the mesoporous substrate is used as the printing substrate, the colloidal suspension is used as the printing ink, and the moving curved liquid surface formed between the direct writing print head and the mesoporous substrate is used. Through the seepage induction of the mesoporous substrate, the seepage self-assembly and coordinated direct writing printing of the colloidal particles on the surface of the mesoporous substrate are achieved, and finally patterned colloidal photonic crystals are obtained.

[0043] Preferably, the nano-colloidal suspension in step 1 can be a colloidal silica suspension (Ludox SM-30, Sigma-Aldrich), the mass fraction of the suspension is 30 wt %, and the diameter of the silica particles is less than 20 nm.

[0044] Preferably, the culture dish in step 1 can be a disposable plastic culture dish, and the nano-colloid suspension is injected into the culture dish.

[0045] Preferably, in step 1, the culture dish containing the colloidal silica suspension is placed in a closed environment (such as a sealed box) and slowly evaporated for about 2 days, so that a mesoporous substrate can be formed in the culture dish.

[0046] Preferably, the colloidal suspension system in step 2 can be a polystyrene microsphere colloidal suspension from Duke Scientific (DUKE), with an initial mass concentration of 10 wt.% and a density of 1.05 g / cm 3 The colloidal microsphere particle sizes include 170, 180, 230, 255, 320, 1000 and 3000 nanometers.

[0047] Preferably, in step 2, before the injection of the colloidal droplets, the colloidal suspension is diluted 2 to 10 times with ultrapure water, and then stirred with ultrasound for 1 minute to ensure uniform dispersion of the particles.

[0048] Preferably, the colloidal suspension can be injected onto the mesoporous substrate obtained in step 1 by a pipette, and the colloidal particles spontaneously assemble on the surface of the mesoporous substrate to form a colloidal crystal structure, such as Figure 1 As shown. The large-area colloidal photonic crystal formed is Figure 4 and Figure 5 shown.

[0049] Preferably, the percolation self-assembly collaborative inkjet printing method of the mesoporous substrate in step 2 uses an inkjet printer, which can be implemented by a piezoelectric inkjet printer, and mainly includes loading a low-viscosity colloidal suspension ink system into an inkjet printer cartridge, and placing the mesoporous substrate as a printing substrate on a printing table for printing. Figure 2 shown.

[0050] Preferably, the direct writing printer is used in the percolation self-assembly collaborative direct writing printing method of the mesoporous substrate in step 2, such as Figure 6 As shown, a pressure dispenser can be used to achieve this, including:

[0051] Add the prepared colloidal suspension to the dispensing syringe, and install the dispensing syringe on the Z axis of the dispensing machine. The outlet of the dispensing syringe is connected to a needle of interchangeable thickness, which has been hydrophobicized to effectively prevent the liquid from climbing; the other end of the dispensing syringe is connected to a precision pressure regulating valve through a gas pipeline, and the precision pressure regulating valve is connected to a pressure tank storing compressed gas. The compressed gas flowing from the pressure tank into the gas pipeline squeezes the colloidal suspension out of the needle;

[0052] The pressure in the gas pipeline can be controlled by a precision pressure regulating valve, thereby controlling the discharge process of the colloidal suspension from the dispensing needle;

[0053] Set the printing pattern, start printing, and the colloidal suspension will flow out continuously from the dispensing needle.

[0054] When the dispensing needle and the mesoporous substrate move relative to each other at a speed v, the colloidal particles will assemble on the surface of the mesoporous substrate to form colloidal photonic crystals, such as Figure 3 shown.

[0055] Embodiment 1:

[0056] Mesoporous substrate preparation:

[0057] The mesoporous substrate was prepared by drying an aqueous dispersion of silica colloidal particles (Ludox SM-30) with a radius of 5 nm and an initial concentration of 30 wt%. The molar mass and density at 25 °C were 60.08 gmol-1 and 1.22 g mL -1A controlled volume of the colloidal dispersion was injected into a 6 cm diameter petri dish and evaporated from the free surface for 48 hours in a natural environment (T=25°C, RH=30%). The evaporation of water will gradually solidify the silica dispersion until a solid porous substrate with a thickness of about 5 mm and a diameter of 6 cm is formed, and the porosity of the porous substrate is about 30%.

[0058] Preparation of colloidal suspension:

[0059] The polystyrene (PS) particle suspension used in the colloidal suspension preparation was purchased from Duke Scientific with an initial mass concentration of 10 wt % and a nominal density of 1.05 g cm -3 The monodisperse polystyrene (PS) colloidal solution was diluted to 2 wt % with pure water. The PS particle size was 3 μm. The suspension was ultrasonically stirred for 1 min before the experiment to make the suspension uniformly dispersed.

[0060] Colloidal crystal self-assembly:

[0061] A 10-microliter droplet of colloidal liquid was injected onto the mesoporous substrate using a pipette. After a few tens of seconds, a monolayer of ordered colloidal crystal structure was formed on the mesoporous substrate, as shown in Figure 2. Figure 3 shown.

[0062] Embodiment 2:

[0063] Mesoporous substrate preparation:

[0064] The mesoporous substrate was prepared by drying an aqueous dispersion of silica colloidal particles (Ludox SM-30) with a radius of 6 nm and an initial concentration of 30 wt%. A controlled volume of the colloidal dispersion was injected into a 10 cm diameter petri dish and evaporated from the free surface for about 48 hours in a natural environment (T=25°C, RH=30%). The evaporation of water will gradually solidify the silica until a solid porous substrate with a thickness of about 8 mm and a diameter of 10 cm is formed, and the porosity of the porous substrate is about 30%.

[0065] Preparation of colloidal suspension:

[0066] Polystyrene (PS) microsphere colloidal suspension was purchased from Duke Scientific with an initial mass concentration of 10 wt % and a nominal density of 1.05 g cm -3 The monodisperse PS colloidal solution was diluted with pure water so that the volume fractions of the colloidal particles in the suspension were 0.005 and 0.01, respectively. The PS particle size was 0.2 μm. Before the experiment, the suspension was ultrasonically stirred for 1 minute to make the suspension uniformly dispersed.

[0067] Colloidal self-assembly and inkjet printing:

[0068] The inkjet printer can be realized by using a microelectronic inkjet printer, and a piezoelectric inkjet printer is selected here.

[0069] Place the prepared mesoporous substrate on the XY axis sample moving platform of the inkjet printer.

[0070] Add the prepared colloidal suspension to the ink cartridge. By controlling the voltage waveform, on-demand droplet generation and jetting can be achieved. When picoliter droplets detach from the nozzle, fly and deposit on the mesoporous substrate, the droplets will quickly spread on the mesoporous substrate. Almost at the same time, the colloidal particles are quickly assembled under the seepage of the mesoporous substrate to form an ordered structure. By controlling the voltage waveform, the volume fraction of the colloidal particles, the viscosity and other related process parameters, and by setting different printing patterns, patterned colloidal photonic crystal structure manufacturing can be achieved.

[0071] Embodiment 3:

[0072] Mesoporous substrate preparation:

[0073] The mesoporous substrate was prepared by drying an aqueous dispersion of silica colloidal particles (Ludox SM-30) with a radius of 5 nm and an initial concentration of 30 wt%. A controlled volume of the colloidal dispersion was injected into a 10 cm diameter petri dish and evaporated from the free surface for 48 hours in a natural environment (T=25°C, RH=30%). The evaporation of water will gradually solidify the silica dispersion until a solid porous substrate with a thickness of about 8 mm and a diameter of 10 cm is formed, and the porosity of the porous substrate is about 30%.

[0074] Preparation of colloidal suspension:

[0075] The polystyrene (PS) particle suspension for preparing the colloidal suspension was purchased from Duke Scientific with an initial mass concentration of 10 wt % and a nominal density of 1.05 g cm -3 The monodisperse PS colloidal solution was diluted with pure water so that the volume fractions of the colloidal particles in the suspension were 0.005, 0.01, 0.02, 0.03, 0.04, and 0.05, respectively. The PS particle size was 1 μm. The suspension was ultrasonically stirred for 1 minute before the experiment to make the suspension uniformly dispersed.

[0076] Colloidal self-assembly collaborative direct writing printing:

[0077] Direct writing printer can be realized by using glue dispensing machine. Here we choose Shenzhen Xiaomao automatic glue dispensing machine.

[0078] Place the prepared mesoporous substrate with a diameter of 10 cm and a thickness of 8 mm on the XY-axis plane moving platform of the dispensing machine.

[0079] Add the prepared colloidal suspension to the dispensing syringe, connect the fluid pipeline, and install the syringe on the Z axis of the dispensing machine (dispensing head). The dispensing process of the colloidal suspension from the dispensing needle is controlled by a precision pressure regulating valve. When the dispensing needle and the mesoporous substrate are close to each other, a fluid meniscus can be formed. When the injection needle and the mesoporous substrate move relative to each other, the colloidal particles will assemble on the surface of the mesoporous substrate to form a strip-shaped colloidal photonic crystal, such as Figure 6 By controlling the printing rate (0-100 mm / s) and the volume fraction of the colloidal suspension (0.005, 0.01, 0.02, 0.03, 0.04, 0.05), the printing of sub-monolayer, monolayer and multi-layer colloidal crystal structures can be achieved.

[0080] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cross-scale micro-nano manufacturing method for colloid self-assembly and collaborative printing guided by mesoporous substrate percolation, characterized in that: The steps include: Step 1: placing a container containing a nano-colloid suspension in a closed environment to evaporate slowly, thereby forming a mesoporous substrate with a smooth surface in the container; Step 2: using the mesoporous substrate obtained in step 1 as a substrate, injecting and spreading the colloidal suspension on the mesoporous substrate, and the colloidal particles will quickly self-assemble under the seepage effect of the mesoporous substrate to form an ordered colloidal photonic crystal structure; Alternatively, the mesoporous substrate obtained in step 1 is used as a printing substrate, and the colloidal suspension is used as a printing ink system, which is combined with a slit coating printing technology to quickly manufacture a large-area colloidal photonic crystal structure; Alternatively, the mesoporous substrate obtained in step 1 is used as a printing substrate, and the colloidal suspension is used as a printing ink system, which is combined with an inkjet printing patterning manufacturing technology to achieve rapid micro-nano manufacturing of patterned colloidal photonic crystals; Alternatively, the mesoporous substrate obtained in step 1 is used as a printing substrate, and the colloidal suspension is used as a printing ink system, which is combined with ink direct writing printing technology to achieve micro-nano manufacturing of patterned colloidal photonic crystals.

2. The cross-scale micro-nano manufacturing method of mesoporous substrate percolation-guided colloidal self-assembly collaborative printing according to claim 1, characterized in that: The nano-colloid suspension in step 1 is a silica colloidal suspension, the mass fraction of the suspension is 30 wt %, and the diameter of the silica particles is 12 nm.

3. The cross-scale micro-nano manufacturing method of mesoporous substrate percolation-guided colloidal self-assembly collaborative printing according to claim 1, characterized in that: The container in step 1 is a disposable plastic culture dish, and the nano-colloid suspension is injected into the culture dish; the closed environment is a sealed box.

4. The cross-scale micro-nano manufacturing method of mesoporous substrate percolation-guided colloidal self-assembly collaborative printing according to claim 1, characterized in that: In the step 1, a culture dish containing the colloidal silica suspension is placed in a closed room temperature environment and slowly evaporated for 2 days to form a mesoporous substrate in the culture dish.

5. The method for cross-scale micro-nano manufacturing by colloid self-assembly and collaborative printing guided by mesoporous substrate percolation according to claim 1, characterized in that: The printing ink system in step 2 is a low-viscosity colloidal suspension system formed by colloidal microspheres and a dispersant. The colloidal microspheres are polystyrene (PS) microspheres, silica microspheres, and gold / silver nanoparticle-coated PS microspheres. The size of the colloidal microspheres is 100 nm to 10 μm.

6. The method for cross-scale micro-nano manufacturing by colloid self-assembly and collaborative printing guided by mesoporous substrate percolation according to claim 1, characterized in that: In the step 2, before the printing ink system is loaded into the inkjet printer cartridge, the colloidal suspension is diluted 2 to 10 times with ultrapure water, and then ultrasonically stirred for 1 minute to ensure uniform dispersion of the particles.

7. The method for cross-scale micro-nano manufacturing by colloid self-assembly and collaborative printing guided by mesoporous substrate percolation according to claim 1, characterized in that: The droplets of the printing ink system come into contact with the surface of the mesoporous substrate through the jetting process, and the colloidal particles in the ink quickly self-assemble on the surface of the mesoporous substrate to form a colloidal photonic crystal structure.

8. The method for cross-scale micro-nano manufacturing by colloid self-assembly and collaborative printing guided by mesoporous substrate percolation according to claim 1, characterized in that: The inkjet printing patterning manufacturing technology in step 2 is implemented using a microelectronic inkjet printer; The mesoporous substrate is used as a printing substrate and is placed on a sample displacement stage of an inkjet printer; The configured printing ink system is loaded into an inkjet printer cartridge, and through the inkjet process, the colloidal suspension ink droplets are generated, fly, and deposited on the mesoporous substrate; When the ink droplets of the printing ink system contact the mesoporous substrate, they spread rapidly and form a strong percolation effect of the mesoporous substrate, thereby inducing the colloidal particles in the ink droplets to assemble rapidly on the substrate surface and quickly form an ordered colloidal photonic crystal structure; By digitally controlling the ink droplets of the massive printing ink system through the nozzle, the massive ink droplets can quickly form patterned colloidal photonic crystals at different positions of the mesoporous substrate according to different time sequences.

9. The method for cross-scale micro-nano manufacturing by colloid self-assembly and collaborative printing guided by mesoporous substrate percolation according to claim 1, characterized in that: The ink direct writing printing technology in step 2 is implemented by using a dispensing machine, including: Place the mesoporous substrate on the XY plane of the mobile platform of the dispensing machine; Add the prepared colloidal suspension into the dispensing syringe, and install the dispensing syringe on the Z axis of the dispensing machine; the outlet end of the dispensing syringe is connected to a needle of changeable thickness, and the needle is treated with hydrophobicity; the other end of the dispensing syringe is connected to a precision pressure regulating valve through a gas pipeline, and the precision pressure regulating valve is connected to a pressure tank storing compressed gas, and the compressed gas flowing from the pressure tank into the gas pipeline squeezes the colloidal suspension out of the needle; The pressure in the gas pipeline is controlled by a precision pressure regulating valve, thereby controlling the discharge process of the colloidal suspension from the needle; Set the printing pattern, start printing, and the colloidal suspension flows out continuously from the dispensing needle; When the dispensing needle and the mesoporous substrate move relative to each other, the colloidal particles self-assemble on the surface of the mesoporous substrate to form patterned colloidal photonic crystals.

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