An aggregation-induced emission material, a preparation method and application thereof
By preparing aggregation-induced luminescence materials adapted to industrial fine particles and combining them with optical signal acquisition, a highly sensitive non-contact monitoring of fine particles in non-transparent porous media was achieved. This solved the problems of compatibility and penetration depth in existing technologies and is applicable to environmental engineering and chemical separation fields.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SOUTH CHINA UNIV OF TECH
- Filing Date
- 2025-12-04
- Publication Date
- 2026-05-29
AI Technical Summary
Existing AIE materials lack loading strategies suitable for industrial fine particles in non-transparent porous media scenarios, which cannot meet the monitoring needs of environmental engineering and chemical separation fields. Furthermore, traditional optical technologies have difficulty penetrating media with a thickness greater than 10µm.
By preparing aggregation-induced emission materials, conjugates, electron donors and additives are mixed and coupled together with particulate matter containing active groups to form aggregation-induced emission materials that are compatible with a variety of materials. These materials can then be combined with lasers and near-infrared detection cameras for non-contact monitoring.
It achieves highly sensitive, non-contact monitoring of fine particles in non-transparent porous media, with a penetration depth of up to 1000µm, adapting to the monitoring needs of various materials and avoiding damage to the media structure.
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Figure CN121249353B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of multiphase flow monitoring technology, and in particular to an aggregation-induced emission material, its preparation method, and its application. Background Technology
[0002] In the fields of energy, environment, and chemical industry, non-transparent porous media (such as polymer filter membranes, stainless steel sintered membranes, and activated carbon porous membranes) are core functional components. The transport characteristics of fine particles inside them (migration rate, aggregation location, and retention efficiency) directly determine the operating efficiency and lifespan of the components.
[0003] Fine particle tracing technology is the most direct and effective experimental method for studying the transport characteristics of fine particles in porous media. Patent CN202510594665.8 discloses a particle tracking and processing method, preparation process, and percolation experimental apparatus suitable for transparent samples. Combined with image processing algorithms, it can effectively improve the accuracy and real-time performance of particle detection. However, commonly used porous media in industry, such as sintered stainless steel membranes, activated carbon composite membranes, and polyvinylidene fluoride membranes, are all non-transparent. Due to the strong light absorption and scattering capabilities of the framework, traditional optical techniques struggle to penetrate media with a thickness >10µm, making it impossible to trace fine particles.
[0004] Aggregation-induced emission (AIE) materials possess the characteristics of "weak fluorescence in dispersed state and strong fluorescence in aggregated state." Near-infrared II (NIR-II) AIE materials, in particular, can effectively reduce light scattering interference from non-transparent media and improve penetration depth (up to 1000µm); they also exhibit excellent photostability. However, existing patents related to AIE materials primarily focus on the biomedical field. For example, patent CN202510610234.6 discloses NIR-II AIE water-soluble nanoparticles for in vivo intestinal vascular monitoring, and patent CN202411477986.1 discloses glycyrrhizic acid AIE nanoparticles for gastrointestinal fluorescence tracing. Their core requirements are biocompatibility and in vivo metabolic safety, with the monitoring targets being transparent or semi-transparent biological tissues (intestinal perivascular tissue has weak light absorption), eliminating the need to address the complex pore structure and strong light scattering of porous media.
[0005] Furthermore, existing AIE (Alternating Injection) tracing technologies in the biomedical field fail to address key issues in non-transparent porous media scenarios: First, there is a lack of suitable loading strategies for AIE molecules and industrial fine particles (such as colloids and catalyst particles). Biological AIE particles are mostly water-soluble nanoparticles, which are prone to detachment when directly used for industrial fine particle labeling and cannot be adapted to fine particles of different inorganic and organic materials. Second, the applicable scenarios are limited. Biological tracing does not need to consider industrial operating parameters such as fluid flow rate, medium temperature, and pressure, failing to meet the actual monitoring needs of environmental engineering and chemical separation fields. Therefore, there is an urgent need to develop a dedicated AIE-based fine particle tracing technology specifically for the characteristics of non-transparent porous media to fill the current technological gap. Summary of the Invention
[0006] The purpose of this invention is to provide an aggregation-induced emission material, its preparation method, and its application, enabling non-contact, high-sensitivity tracking of fine particles within non-transparent porous media.
[0007] To achieve the above objectives, the present invention provides a method for preparing aggregation-induced emission materials, comprising the following preparation steps:
[0008] S1. Mix the conjugate, electron donor, and additive, and react to obtain aggregation-induced luminescent molecules;
[0009] S2. Mix the aggregation-induced emission molecules with an organic solvent to obtain a molecular solution, mix the particulate matter containing active groups with the solvent to obtain a particulate matter solution, mix the molecular solution and the particulate matter solution, and react to obtain the aggregation-induced emission material.
[0010] In S1, electron donors include those containing amino groups, those containing carboxyl groups, or those containing hydroxyl groups.
[0011] The active groups in S2 particles include amino, carboxyl, or hydroxyl groups.
[0012] In this invention, the conjugate in S1 includes benzodithiophene or thienothiophene derivatives, preferably 2,7-dibromobenzodithiophene. The additives include at least one of a catalyst and a solvent. The catalyst includes at least one of palladium acetate, tris(o-methylphenyl)phosphine, and tetra(triphenylphosphine)palladium. The solvent includes at least one of N,N-dimethylformamide and dioxane solution. The reaction includes a coupling reaction.
[0013] In this invention, the reaction conditions and reaction process in S1 are adjusted according to the types of conjugates, electron donors and additives.
[0014] In this invention, the electron donor containing a carboxyl group in S1 is preferably 4-vinylbenzoic acid, and the electron donor containing an amino group is preferably 4-aminophenylboronic acid.
[0015] In this invention, the emission wavelength of the aggregation-induced luminescent molecules in S1 is 900-1700 nm, the maximum excitation wavelength is 750-850 nm, and the maximum emission wavelength is 890-1010 nm.
[0016] In this invention, the particulate matter containing active groups in S2 includes inorganic or organic particles. The inorganic particles have a particle size of 10-2000 nm, and the organic particles have a particle size of 1-50 µm. The inorganic particles are preferably silicon dioxide.
[0017] In this invention, the organic solvent in S2 includes N,N-dimethylformamide or ethanol, and the solvent includes water.
[0018] In this invention, the reaction in S2 includes EDC / NHS activation or electrostatic assembly, the reaction temperature is 25-100℃, and the reaction time is 0.5-48h.
[0019] In this invention, the temperature and reaction time in S2 are adjusted according to the aggregation-induced emission molecules and the types of particles containing active groups.
[0020] In this invention, based on the mass of the aggregation-induced emission material being 100%, the mass percentage of aggregation-induced emission molecules in the aggregation-induced emission material is 5%-10%.
[0021] The present invention also provides an aggregation-induced emission material prepared by the above-described method for preparing an aggregation-induced emission material.
[0022] This invention also provides the application of the above-mentioned aggregation-induced emission material in monitoring the motion characteristics of fine particles within a non-transparent porous filter membrane.
[0023] The present invention also provides a system for monitoring the motion characteristics of fine particles within a non-transparent porous filter membrane, comprising:
[0024] The functionalized particle preparation module completes the synthesis of aggregation-induced emission molecules and loads them onto the surface of particles containing active groups to prepare the above-mentioned aggregation-induced emission materials;
[0025] Fluid transport module, used for transporting fluids;
[0026] A mixer module for mixing aggregation-induced light-emitting materials with fluids;
[0027] Medium clamping module for fixing non-transparent porous media;
[0028] The excitation detection module is used to excite the aggregation-induced emission material and capture its fluorescence signal.
[0029] The excitation and detection module includes a laser, a long-pass filter, and a near-infrared detection camera;
[0030] The excitation wavelength of the laser is 750-850nm, the cutoff wavelength of the long-pass filter is ≥900nm, and the detection wavelength range of the near-infrared detection camera is 900-1700nm.
[0031] In this invention, the fluid delivery module is preferably a peristaltic pump or a fan.
[0032] like Figure 1As shown, the present invention also provides a method for monitoring the motion characteristics of fine particles within a non-transparent porous filter membrane using the above-described non-transparent porous filter membrane fine particle motion characteristic monitoring system, comprising the following steps:
[0033] (1) Aggregation-induced emission materials were synthesized through a functionalized particle preparation module, and then the prepared aggregation-induced emission materials were placed in a mixer module for later use;
[0034] (2) Fix the non-transparent porous medium in the medium clamping module, and use the fluid delivery module to introduce the fluid into the mixer module to mix with the aggregation-induced light-emitting material to obtain a mixture of aggregation-induced light-emitting material and fluid;
[0035] (3) The mixture of aggregation-induced emission material and fluid is introduced into a non-transparent porous medium. The excitation wavelength of the laser and the cutoff wavelength of the long-pass filter in the excitation detection module are adjusted to excite the aggregation-induced emission material in the mixture of aggregation-induced emission material and fluid. Then, the fluorescence images of the inlet end, the middle section and the outlet end of the non-transparent porous medium are captured by the near-infrared detection camera. The path and aggregation area of the aggregation-induced emission material in the non-transparent porous medium are analyzed, the retention efficiency is calculated and the transmission performance of the aggregation-induced emission material in the non-transparent porous medium is evaluated.
[0036] In this invention, the non-transparent porous medium used in the above-mentioned non-transparent porous filter membrane fine particle motion characteristic monitoring system and method includes polyvinylidene fluoride porous membrane, polypropylene meltblown porous membrane, or polystyrene membrane. The thickness of the non-transparent porous medium is 10-500µm, the porosity is 30%-90%, and the pore size is 1-50µm.
[0037] In this invention, the fluid used in the above-mentioned non-transparent porous filter membrane fine particle motion characteristic monitoring system and method includes air, water or organic solvent, wherein the organic solvent is preferably ethanol.
[0038] In this invention, the excitation wavelength of the laser in the excitation detection module is adjusted to match the maximum excitation wavelength of the aggregation-induced emission material; the cutoff wavelength of the long-pass filter is adjusted to match the maximum emission wavelength of the aggregation-induced emission material.
[0039] The present invention has the following beneficial effects:
[0040] This invention provides a method for preparing aggregation-induced emission materials, comprising the following preparation steps: S1, mixing a conjugate, an electron donor, and an additive, reacting to obtain aggregation-induced emission molecules; S2, mixing the aggregation-induced emission molecules with an organic solvent to obtain a molecular solution, mixing particles containing active groups with the solvent to obtain a particulate solution, mixing the molecular solution and the particulate solution, reacting to obtain the aggregation-induced emission material; In S1, the electron donor includes an amino-containing electron donor, a carboxyl-containing electron donor, or a hydroxyl-containing electron donor, wherein the carboxyl-containing electron donor is 4-vinylbenzoic acid, and the amino-containing electron donor is 4-aminophenylboronic acid; In S2, the active groups in the particles containing active groups include amino groups, The particulate matter, comprising a carboxyl or hydroxyl group, includes inorganic or organic particles; the inorganic particles have a particle size of 10-2000 nm, and the organic particles have a particle size of 1-50 µm, wherein the inorganic particles are silicon dioxide; the conjugate in S1 includes benzodithiophene or thienothiophene derivatives, wherein the thienothiophene derivative is 2,7-dibromobenzodithiophene; the additives include at least one of a catalyst and a solvent; the catalyst includes at least one of palladium acetate, tris(o-methylphenyl)phosphine, and tetra(triphenylphosphine)palladium; the solvent includes at least one of N,N-dimethylformamide and dioxane solution; the reaction includes a coupling reaction; the emission wavelength of the aggregation-induced emission molecules in S1 is 900-1700 nm, the maximum excitation wavelength is 750-850 nm, and the maximum emission wavelength is 890-1010 nm.
[0041] The aggregation-induced emission material prepared by this invention can penetrate non-transparent porous media with a thickness of 10-500µm to achieve direct visual tracking of fine particles inside the media.
[0042] This invention combines aggregation-induced emission molecules with particulate matter containing active groups through a differentiated chemical modification strategy, adapting to various materials and meeting the monitoring needs of multiple fields such as environmental engineering and chemical separation.
[0043] The aggregation-induced emission material prepared in this invention can be applied to the monitoring of fine particle motion characteristics in non-transparent porous filter membranes. This eliminates the need to make the porous medium transparent and achieves non-contact monitoring through optical signal acquisition, thus avoiding damage to the medium structure caused by traditional contact methods.
[0044] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0045] Figure 1 This is a simplified flowchart of the method for monitoring the motion characteristics of fine particles inside a non-transparent porous filter membrane according to the present invention.
[0046] Figure 2This is a graph showing the test results of the maximum emission wavelength of the aggregation-induced emission materials prepared in Examples 1 and 2 of this invention;
[0047] Figure 3 This is an optical image of the migration tracking of the aggregation-induced emission material prepared in Example 1 in a porous polyvinylidene fluoride membrane;
[0048] in, Figure 3 The optical image when a is 0h. Figure 3 In this context, b represents the optical image at 10h. Figure 3 In this context, c represents the optical image at 24 hours.
[0049] Figure 4 This is an optical image of the migration tracking of the aggregation-induced emission material prepared in Example 2 in a polypropylene meltblown porous membrane;
[0050] in, Figure 4 The optical image when a is 0h. Figure 4 In this context, b represents the optical image at 2h. Figure 4 c represents the optical image at 6h. Detailed Implementation
[0051] The present invention will be further described below with reference to the accompanying drawings and embodiments. Unless otherwise defined, the technical or scientific terms used in this invention should be understood in their ordinary sense by those skilled in the art. The features mentioned above or in the specific examples mentioned in this invention can be combined arbitrarily, and these specific embodiments are only used to illustrate the invention and are not intended to limit the scope of the invention.
[0052] The industrial-grade polyvinylidene fluoride (PVDF) porous membrane was purchased from Shanghai Shupei Experimental Equipment Co., Ltd., model SP-PVDFLM-35.
[0053] The polypropylene (PP) meltblown porous membrane was purchased from Dongguan Changhong Plastic Raw Materials Co., Ltd., model number PP-1500H.
[0054] Example 1
[0055] S1. Under nitrogen protection, add the following to a 500 mL three-necked round-bottom flask in sequence: 0.5 mmol of 2,7-dibromobenzodithiophene (conjugate), 1.2 mmol of 4-vinylbenzoic acid (carboxyl-containing electron donor), 0.025 mmol of palladium acetate (catalyst), 0.1 mmol of tris(o-methylphenyl)phosphine (catalyst), and 150 mL of N,N-dimethylformamide (solvent). Mix the mixture, then place the reaction system in an oil bath and heat to 110 °C. Perform the Heck coupling reaction for 16 h with magnetic stirring. After the reaction is complete, allow it to cool naturally. The reaction solution was cooled to room temperature and poured into deionized water. Extraction was performed with dichloromethane, and the organic phases were combined and dried overnight with anhydrous sodium sulfate. The desiccant was removed by filtration, and the solvent was removed by vacuum distillation to obtain the crude product. The crude product was separated by silica gel column chromatography (silica gel 200-300 mesh, eluent gradient: pure dichloromethane → a mixed solution of dichloromethane and methanol (dichloromethane to methanol volume ratio 20:1). The target fraction was collected and concentrated, and finally purified by recrystallization with 50 mL of methanol. After vacuum drying at 60 °C for 8 h, aggregation-induced emission molecules with a purity ≥98.5% were obtained.
[0056] 1.0 g of silica with a particle size of 200 nm was placed in water to obtain silica gel with a solid content of 20 wt%. This gel was then placed in a 250 mL single-necked round-bottom flask, and 3-aminopropyltriethoxysilane was added. The mixture was reacted at 50 °C with magnetic stirring for 6 h. After the reaction was complete, the product was centrifuged at 8000 rpm for 15 min, the precipitate was washed with deionized water, and vacuum dried to obtain silica particles containing amino groups (particulate matter containing amino groups), which were then set aside for later use.
[0057] S2. Take the aggregation-induced emission molecules prepared above and dissolve them in N,N-dimethylformamide to obtain a molecular solution with a concentration of 0.62 mg / mL; separately take silica particles containing amino groups, place them in deionized water, and ultrasonically disperse them for 30 min to obtain a particulate solution.
[0058] The molecular solution was added dropwise to the particulate solution, and after stirring until homogeneous, the pH of the system was adjusted to 5.5 to obtain a mixture. 0.12 mmol of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and 0.12 mmol of N-hydroxysuccinimide (NHS) were then added sequentially to the mixture. The reaction system was then placed in a constant-temperature water bath at 25°C and reacted for 12 h using the EDC / NHS activation method under magnetic stirring. After the reaction was complete, the product was centrifuged at 10,000 rpm, washed alternately with deionized water and ethanol, and vacuum dried (60°C, 10 h) to obtain the aggregation-induced emission material (aggregation-induced emission molecules accounted for 6.2% of the aggregation-induced emission material mass).
[0059] Example 2
[0060] S1. Under nitrogen protection, the following components were added sequentially to a 500 mL three-necked round-bottom flask: 0.5 mmol of 2,7-dibromobenzodithiophene (conjugate), 1.5 mmol of 4-aminophenylboronic acid (electron donor containing the amino group), 0.02 mmol of tetrakis(triphenylphosphine)palladium (catalyst), and 200 mL of 80% dioxane solution (solvent). The reaction system was placed in an oil bath and heated to 85 °C. The Suzuki coupling reaction was carried out for 14 h with magnetic stirring. After the reaction was completed, the mixture was allowed to cool naturally to room temperature. The reaction solution was concentrated to approximately 50 mL by vacuum distillation and poured into 200 mL of deionized water. A solid precipitate was precipitated, which was collected by filtration. The precipitate was dissolved in dichloromethane, dried over anhydrous sodium sulfate overnight, and then concentrated by filtration to obtain the crude product. The target fraction was separated by silica gel column chromatography (silica gel size 200-300 mesh, eluent gradient: a mixed solution of dichloromethane and n-hexane (volume ratio of dichloromethane to n-hexane 2:1) → a mixed solution of dichloromethane and methanol (volume ratio of dichloromethane to methanol 10:1). The fraction was collected and concentrated, purified by recrystallization with 50 mL of toluene, and vacuum dried (80 °C, 6 h) to obtain aggregation-induced luminescent molecules with a purity ≥98.5%.
[0061] 2.0 g of silica dust particles with a particle size of 2000 nm were placed in a 500 mL single-necked round-bottom flask, and 5.1 mmol of maleic anhydride and 100 mL of N,N-dimethylformamide were added. The mixture was reacted at 80 °C with magnetic stirring for 8 h. After the reaction was completed, the mixture was cooled to room temperature, filtered to collect the solid, washed with acetone, and then vacuum dried at 70 °C for 10 h to obtain silica particles containing carboxyl groups (particulate matter containing carboxyl groups), which were then used for later use.
[0062] S2. Dissolve the aggregation-induced emission molecules prepared above in ethanol to obtain a molecular solution with a concentration of 0.63 mg / mL. Separately, disperse silica particles containing carboxyl groups in deionized water and sonicate for 40 min to obtain a particulate solution. Adjust the pH of the particulate solution to 5.0 with 0.1 mol / L hydrochloric acid. Slowly add the molecular solution dropwise to the particulate solution, stir evenly, and place in a constant temperature water bath. React at 30℃ with magnetic stirring for 8 h using an electrostatic assembly method. After the reaction is complete, centrifuge at 9000 rpm for 15 min, wash the precipitate with deionized water, and vacuum dry to obtain the aggregation-induced emission material (aggregation-induced emission molecules account for 8.7% of the mass of the aggregation-induced emission material).
[0063] Characterization tests:
[0064] The maximum emission wavelength of the aggregation-induced emission materials prepared in Examples 1 and 2 were tested, and the results are as follows: Figure 2 As shown. From Figure 2 It can be seen that the maximum emission wavelength of the aggregation-induced emission material prepared in Example 1 is 945 nm, and the maximum emission wavelength of the aggregation-induced emission material prepared in Example 2 is 970 nm.
[0065] Application Example 1
[0066] The aggregation-induced emission material prepared in Example 1 was applied to the monitoring of fine particle motion characteristics within a non-transparent porous filter membrane, specifically including:
[0067] Industrial-grade polyvinylidene fluoride (PVDF) porous membrane was selected, with a membrane thickness of 50µm, a porosity of 60%, and an average pore size of 1µm. The surface of the PVDF porous membrane has a sponge-like porous structure, and its non-transparent properties are manifested by a visible light transmittance of <5% (measured at a wavelength of 700nm).
[0068] The above-mentioned polyvinylidene fluoride porous membrane is fixed in a media clamping device, the temperature of which is maintained at 25°C and the operating pressure is 0.1 MPa.
[0069] Using deionized water as the fluid and a peristaltic pump, aggregation-induced emission material (AIE) was dispersed in the deionized water to obtain a mixture of AIE with a concentration of 100 µg / L. This mixture was then introduced into a polyvinylidene fluoride (PVDF) porous membrane at a flow rate of 1.0 mL / min. The excitation wavelength of the laser (2 W) in the excitation and detection module was adjusted to 808 nm, and the cutoff wavelength of the long-pass filter was adjusted to 1000 nm to excite the AIE in the mixture. Subsequently, fluorescence images of the inlet, mid-section, and outlet of the PVDF porous membrane were captured at a frequency of 2 h / time using an InGaAs near-infrared detection camera (640 × 512 resolution). The results are as follows: Figure 3 As shown.
[0070] from Figure 3 It can be seen that at 0h, the fluorescence signal in the middle section along the thickness direction of the membrane is uniformly distributed (intensity 1250±50 a.u.), indicating that the luminescent particles have not yet diffused to this location. At 10h, the fluorescence intensity of this section increases, and a punctate strong signal appears in the throat of the 1-3µm pores (intensity 2800±120 a.u.), confirming that particles begin to accumulate in the narrow channels. At 24h, the fluorescence intensity of this section continues to increase, and a continuous strong luminescent region forms locally (fluorescence intensity 6850±150 a.u.), at which point the accumulated particles begin to block the pores. By comparing the fluorescence signals of each section within the membrane, the particle retention efficiency can be calculated to be 85%.
[0071] Application Example 2
[0072] The aggregation-induced emission material prepared in Example 2 was applied to the monitoring of fine particle motion characteristics within a non-transparent porous filter membrane, specifically including:
[0073] Polypropylene (PP) meltblown porous membrane was selected with a thickness of 300µm, a porosity of 80%, an average pore size of 3.0µm, a fiber diameter of 5-10µm, and a visible light transmittance of <3% (measured at 700nm wavelength).
[0074] The polypropylene meltblown porous membrane was fixed in a media clamping device, the temperature of which was maintained at 25°C and the operating pressure at 0.05 MPa.
[0075] Using air as the fluid and a fan as the driving force, the aggregation-induced luminescence material was dispersed into the air to obtain a concentration of 200 µg / m³. 3 A mixture of aggregation-induced emission material (AIE) and fluid was introduced into a polypropylene meltblown porous membrane at a flow rate of 5.3 cm / s. The excitation wavelength of the laser (3W) in the excitation and detection module was adjusted to 808 nm, and the cutoff wavelength of the long-pass filter was adjusted to 1050 nm to excite the AIE in the mixture. Subsequently, a cooled near-infrared camera (1280×1024 resolution) was used to capture fluorescence images at the inlet, middle section, and outlet of the polypropylene meltblown porous membrane at a frequency of 30 min / time. The results are as follows: Figure 4 As shown.
[0076] from Figure 4 It can be seen that at 0h, the fluorescence signal in the middle section of the membrane thickness direction is uniform (intensity 850±30 a.u.); after 2h, a sheet-like strong signal appears in this section (intensity 3200±100 a.u.), confirming that particles are captured by fibers; at 6h, the fluorescence signal intensifies and expands to the entire membrane section (5600±180 a.u.), reflecting the continuous deposition of particles in the membrane and clogging of the pores; at this time, the filtration efficiency reaches 95%, and the particle deposition amount calculated based on the fluorescence signal distribution is linearly correlated with the increase in airflow resistance (100%) (R0). 2 =0.96).
[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.
Claims
1. A method for preparing an aggregation-induced emission material, characterized in that, The preparation steps include the following: S1. Mix the conjugate, electron donor, and additive, and react to obtain aggregation-induced luminescent molecules; S2. Mix the aggregation-induced emission molecules with an organic solvent to obtain a molecular solution, mix the particulate matter containing active groups with the solvent to obtain a particulate matter solution, mix the molecular solution and the particulate matter solution, and react to obtain the aggregation-induced emission material. The electron donor in S1 includes an amino-containing electron donor or a carboxyl-containing electron donor. The carboxyl-containing electron donor is 4-vinylbenzoic acid, and the amino-containing electron donor is 4-aminophenylboronic acid. The active groups in S2 include amino or carboxyl groups, and the particles include inorganic particles; the particle size of the inorganic particles is 10-2000 nm, and the inorganic particles are silicon dioxide. The conjugate of S1 is 2,7-dibromobenzodithiophene, and the additives include a catalyst and a solvent. The catalyst is at least one of palladium acetate, tris(o-methylphenyl)phosphine, and tetra(triphenylphosphine)palladium, and the solvent is at least one of N,N-dimethylformamide and dioxane solution. The reaction includes a coupling reaction. The aggregation-induced emission molecules in S1 have emission wavelengths of 900-1700 nm, maximum excitation wavelengths of 750-850 nm, and maximum emission wavelengths of 890-1010 nm.
2. The method for preparing an aggregation-induced emission material according to claim 1, characterized in that, The reaction in S2 can be carried out by either EDC / NHS activation or electrostatic assembly, with a reaction temperature of 25-100℃ and a reaction time of 0.5-48h.
3. The method for preparing an aggregation-induced emission material according to claim 1, characterized in that, Based on the mass of aggregation-induced emission material (AIE), the mass percentage of AIE molecules in AIE is 5%-10%.
4. An aggregation-induced emission material prepared by the method for preparing an aggregation-induced emission material according to any one of claims 1-3.
5. The application of the aggregation-induced emission material according to claim 4 in monitoring the motion characteristics of fine particles in a non-transparent porous filter membrane.
6. A system for monitoring the motion characteristics of fine particles within a non-transparent porous filter membrane, characterized in that, include: The functionalized particle preparation module completes the synthesis of aggregation-induced emission molecules and loads them onto the surface of particles containing active groups to prepare the aggregation-induced emission material as described in claim 4. Fluid transport module, used for transporting fluids; A mixer module for mixing aggregation-induced light-emitting materials with fluids; Medium clamping module for fixing non-transparent porous media; The excitation detection module is used to excite the aggregation-induced emission material and capture its fluorescence signal. The excitation and detection module includes a laser, a long-pass filter, and a near-infrared detection camera; The excitation wavelength of the laser is 750-850nm, the cutoff wavelength of the long-pass filter is ≥900nm, and the detection wavelength range of the near-infrared detection camera is 900-1700nm.
7. A method for monitoring the motion characteristics of fine particles within a non-transparent porous filter membrane, characterized in that, The fine particle motion characteristic monitoring system within the non-transparent porous filter membrane as described in claim 6 includes the following steps: (1) Aggregation-induced emission materials were synthesized through a functionalized particle preparation module, and then the prepared aggregation-induced emission materials were placed in a mixer module for later use; (2) Fix the non-transparent porous medium in the medium clamping module, and use the fluid delivery module to introduce the fluid into the mixer module to mix with the aggregation-induced light-emitting material to obtain a mixture of aggregation-induced light-emitting material and fluid; (3) The mixture of aggregation-induced emission material and fluid is introduced into a non-transparent porous medium. The excitation wavelength of the laser and the cutoff wavelength of the long-pass filter in the excitation detection module are adjusted to excite the aggregation-induced emission material in the mixture of aggregation-induced emission material and fluid. Then, the fluorescence images of the inlet end, the middle section and the outlet end of the non-transparent porous medium are captured by the near-infrared detection camera. The path and aggregation area of the aggregation-induced emission material in the non-transparent porous medium are analyzed, the retention efficiency is calculated and the transmission performance of the aggregation-induced emission material in the non-transparent porous medium is evaluated.