Multi-stimuli responsive smart fiber with controllable adjustment of color and brightness and preparation method thereof

Abstract

The application provides a multi-stimulus response smart fiber with controllable color and brightness adjustment and a preparation method thereof, a mathematical model is established to precode the fiber, a photoluminescent material is integrated into the fiber through microfluidic sequence spinning, the fiber has outstanding fluorescence / photo sensitivity, the prepared fiber is twisted, the prepared smart fiber has excellent moisture absorption and photosensitivity, under the stimulation of ultraviolet light, the fiber can emit fluorescence and display axial coding information; meanwhile, due to the AIE effect, the twist number of the prepared twisted fiber changes under the stimulation of humidity, the aggregation state of the molecules and the fluorescence intensity also change. Different twist numbers of the twisted fiber correspond to different fluorescence intensities during the rotation process, quantitative conversion of the fluorescence signal and humidity driving can be realized, reversible interaction between water molecules and the twisted fiber causes the aggregation state to change, thereby realizing controllable adjustment of the brightness of the fiber.

Description

Technical Field

[0001] This invention relates to the field of smart fiber technology, specifically to a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness, and its preparation method. Background Technology

[0002] Intelligent flexible materials are materials that integrate "sensing," "feedback," and "response," capable of receiving driving information (such as light, heat, electricity, magnetism, humidity, pH value, etc.) and outputting control actions or mechanical motion. Compared with traditional rigid materials, intelligent flexible materials can achieve "large response to small stimuli" according to changes in the external environment, and can sense changes in a timely, dynamic, and precise manner. They are now widely used in various intelligent actuation devices and equipment. The design and fabrication of intelligent flexible materials has become an emerging and important development direction in the field of intelligentization, and is widely used in flexible actuators, artificial muscles, electronic devices, medical devices, and other fields. However, intelligent materials with rapid response are difficult to obtain, have complex fabrication processes, are expensive, and also suffer from poor stability and limited stimulus response.

[0003] Patent CN114316267B discloses a shape memory liquid crystal elastomer material with dynamically controllable surface morphology and its preparation method. This invention uses 4-(5-hexenyloxy)phenyl-4-(5-hexenyloxy)benzoate as a liquid crystal monomer and thiol as a crosslinking agent to obtain a shape memory liquid crystal elastomer material with thermally responsive properties. The shortcomings of this invention are that the preparation process is complex, the pharmaceutical materials used are environmentally polluting, and it is not conducive to large-scale industrial production.

[0004] Patent CN110003427A discloses a photostimulation-responsive gel material, its preparation, and its application. This material, when placed in a solvent, exhibits a sensitive response to light stimulation, and its deformation can be controlled by the duration of light exposure; the longer the exposure time, the more pronounced the deformation. However, this invention suffers from a slow response rate and a limited range of stimulus-responsive behaviors.

[0005] In view of this, it is necessary to design an improved multi-stimulus responsive smart fiber with controllable adjustment of color and brightness and its preparation method to solve the above problems. Summary of the Invention

[0006] In view of the technical problems existing in the background art, this application provides a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness and its preparation method, aiming to solve the technical problems of poor stability and single stimulus response of smart materials.

[0007] In a first aspect, embodiments of this application provide a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness, comprising the following steps:

[0008] S1. Take photoluminescent materials of different colors, dilute them with deionized water, stir and dissolve them to obtain photoluminescent aqueous solutions of different colors;

[0009] S2. Add a predetermined amount of sodium alginate powder to the photoluminescent aqueous solutions of different colors obtained in step S1, stir evenly, and obtain the blended spinning solution of sodium alginate and photoluminescent material of different colors.

[0010] S3. Dissolve soluble metal ion salts in deionized water to obtain a coagulation bath;

[0011] S4. Design the coding of fibers by establishing a mathematical model;

[0012] S5. Following the coding sequence designed in step S4, the blended spinning solution obtained in step S2 is injected into the coagulation bath using microfluidic sequential spinning technology to obtain axially coded sodium alginate gel fibers.

[0013] S6. The axially coded sodium alginate gel fiber obtained in step S5 is twisted to obtain a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness.

[0014] In the technical solution of this application embodiment, a mathematical model is established to pre-code the fiber, and photoluminescent materials are integrated into the fiber through microfluidic sequence wet spinning, giving the fiber outstanding fluorescence / photosensitivity. Simultaneously, the prepared fiber is twisted, resulting in a smart fiber with excellent hygroscopicity and photosensitivity. Under humidity stimulation, the smart fiber absorbs water and swells; the volume change during the swelling process is converted into mechanical driving behavior, thereby generating high-speed, reversible torsional driving behavior. Under ultraviolet light stimulation, the fiber emits fluorescence and displays axial encoded information. Simultaneously, due to the AIE (aggregation-induced emission) effect, the prepared torsion fiber, under humidity stimulation, changes the molecular aggregation state and fluorescence intensity as the number of twists changes. Different twist numbers during rotation correspond to different fluorescence intensities, enabling quantitative conversion between fluorescence signals and humidity-driven processes. Water molecules interact reversibly with the torsion fiber, causing changes in its aggregation state, thereby achieving controllable adjustment of the fiber brightness.

[0015] In some embodiments, the photoluminescent material is a quantum dot or a phosphor, and the concentration of the photoluminescent aqueous solution is 0.1–0.5 mg / ml; the quantum dot is a water-soluble quantum dot; and the phosphor is a photoluminescent phosphor.

[0016] In this embodiment, by precisely controlling the concentration of quantum dots or phosphors, the luminescent properties of the smart fiber can be adjusted to meet the needs of different application scenarios. Furthermore, by selecting different types of quantum dots or phosphors, the application range of the smart fiber can be broadened.

[0017] In some embodiments, the mass percentage of sodium alginate in the blend spinning solution is 2-6 wt%; the mass percentage of photoluminescent material in the blend spinning solution is 0.16-0.8 wt%.

[0018] In this embodiment, sodium alginate is selected because it is inexpensive, environmentally friendly, and pollution-free. The sodium alginate content is chosen to ensure that the spinning solution has appropriate viscosity and stability, so as to form continuous and uniform fibers during the spinning process. This ensures that the fibers have good mechanical strength and flexibility, making them less prone to breakage during wear and use. The content of photoluminescent material ensures that the fiber has the required luminescent properties. An appropriate concentration of photoluminescent material can improve the fiber's response speed and reversibility to external stimuli.

[0019] In some embodiments, the stirring rate is 200–800 rpm.

[0020] In this embodiment, stirring effectively disperses sodium alginate and photoluminescent materials uniformly in the solvent, preventing agglomeration and precipitation, and ensuring a uniform distribution of the spinning solution components. An appropriate stirring rate helps reduce air bubbles generated during mixing. The presence of air bubbles can create defects in the fibers, affecting their mechanical properties and appearance. The stirring rate can affect the viscosity of the spinning solution. Within this rate range, a suitable viscosity can be obtained, ensuring fiber formation. A moderate stirring rate can accelerate the dissolution rate of the solute in the solvent, thereby improving production efficiency.

[0021] In some embodiments, the mass percentage of soluble metal ion salt in the coagulation bath is 3-5 wt%. The soluble metal ion salt is one of zinc ion salt, calcium ion salt, or a blended salt of zinc and calcium ions.

[0022] In this embodiment, at a concentration of 3–5 wt%, the metal ion salt can undergo a cross-linking reaction with the carboxyl groups in sodium alginate, rapidly forming gel-like fibers, thereby achieving effective coagulation. Appropriate metal ion salt concentrations contribute to the formation of fiber structures with good mechanical properties and stability, reducing fiber breakage during subsequent processing and use. Different metal ion salts and their concentrations can affect the physical and chemical properties of the fibers, such as flexibility, strength, and biocompatibility.

[0023] In some embodiments, the coding design is as follows: each color of the blended spinning solution is used as a basic coding unit, and different basic coding units are arranged and combined according to the principle of probability combination. Starting from a single code, the complexity is gradually increased to carry out a multi-level coding design.

[0024] In this embodiment, the fibers are coded along their length, expanding the application range of smart materials and meeting the needs of future smart textiles. Through coding design, multiple color combinations can be achieved, thereby producing smart fibers with rich color variations. With a predetermined coding design, a single fiber can emit light of different wavelengths under ultraviolet light stimulation. Multi-level coding design gives the fibers unique color patterns that can be identified and interpreted for information encoding and transmission.

[0025] In some embodiments, the injection rate of the blended spinning solution is 0.1 to 0.5 ml / min.

[0026] In this embodiment, controlling the injection speed can effectively control the fiber diameter, achieving the desired fineness, which helps form fibers with uniform structure and reduces internal defects. Sodium alginate and metal ions are successfully crosslinked directly through wet spinning, resulting in a simple preparation process.

[0027] In some embodiments, the twist rate of the twisting treatment is 2000 to 6000 rpm; the resulting multi-stimulus responsive smart fiber with controllable adjustment of color and brightness has a diameter of 70 to 120 μm and a length of 4 to 20 cm.

[0028] In this embodiment, a traditional twisting process is employed. The resulting fiber exhibits excellent hygroscopicity and can rotate at high speed under humidity stimulation. This fiber is not limited to a single stimulus response mode but can achieve multiple response modes, including high-speed rotation and photoluminescence under humidity and ultraviolet light conditions. By adjusting the twist count, the fiber's physical properties, such as strength, elasticity, and surface characteristics, can be precisely controlled, thereby enabling controllable adjustment of color and brightness. Assembling this polymer fiber can lead to applications in humidity fluorescence sensors and encrypted information storage.

[0029] Secondly, embodiments of this application provide a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness, which is prepared by the method of the first aspect.

[0030] In the technical solution of this application embodiment, the obtained fiber can not only convert clean water resources into continuous mechanical energy output, but also be woven into smart textiles, providing diverse innovative designs for future humidity-controllable intelligent visual flexible devices, smart clothing and flexible robots.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0033] Figure 1 This is a schematic diagram of the microfluidic sequential spinning technology of this application.

[0034] Figure 2 These are SEM images of the fibers in Example 1 of this application at 300x and 500x magnification.

[0035] Figure 3 This is a schematic diagram of the minimum unit multi-level coding principle of this application;

[0036] Figure 4 Optical photographs of the fibers with axial coding in Examples 1-3 of this application under ultraviolet light stimulation;

[0037] Figure 5 This is the fluorescence spectrum of the smart fiber in Example 1 of this application;

[0038] Figure 6 The fluorescence spectra of the smart fibers in Examples 1 and 8 of this application are shown.

[0039] Figure 7 These are optical photographs of the smart fibers in Examples 1 and 8 of this application under ultraviolet light irradiation. Detailed Implementation

[0040] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0042] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0043] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0045] Compared to traditional rigid materials, smart flexible materials can achieve "large response to small stimuli" in response to changes in the external environment. They can sense changes in a timely, dynamic, and precise manner, and are now widely used in various smart actuators and devices. The design and fabrication of smart flexible materials has become an emerging and important development direction in the field of intelligentization, and are widely used in flexible actuators, artificial muscles, electronic devices, medical devices, and other fields. However, smart, rapidly responsive materials are difficult to obtain, have complex fabrication processes, are expensive, and also suffer from poor stability and limited stimulus response.

[0046] To address the technical problems of poor stability and limited stimulus response in smart, fast-responding materials, this application provides a multi-stimulus-responsive smart fiber with controllable color and brightness adjustment, and its preparation method. In this method, photoluminescent materials are integrated into the fiber through microfluidic sequence wet spinning, giving the fiber outstanding fluorescence / photosensitivity. Simultaneously, the prepared fiber is twisted, resulting in a smart fiber with excellent hygroscopicity and photosensitivity.

[0047] In a first aspect, embodiments of this application provide a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness, comprising the following steps:

[0048] S1. Take photoluminescent materials of different colors, dilute them with deionized water, stir and dissolve them to obtain photoluminescent aqueous solutions of different colors;

[0049] S2. Add a predetermined amount of sodium alginate powder to the photoluminescent aqueous solutions of different colors obtained in step S1, stir evenly, and obtain the blended spinning solution of sodium alginate and photoluminescent material of different colors.

[0050] S3. Dissolve soluble metal ion salts in deionized water to obtain a coagulation bath;

[0051] S4. Design the coding of fibers by establishing a mathematical model;

[0052] S5. Following the coding sequence designed in step S4, the blended spinning solution obtained in step S2 is injected into the coagulation bath using microfluidic sequential spinning technology to obtain axially coded sodium alginate gel fibers.

[0053] S6. The axially coded sodium alginate gel fiber obtained in step S5 is twisted to obtain a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness.

[0054] Photoluminescent materials emit colored light after absorbing light energy. By selecting photoluminescent materials of different colors, fibers capable of photoluminescence at different wavelengths can be fabricated. Sodium alginate is a natural polymer that can undergo cross-linking reactions with metal ions to form a gel. Through mathematical models and microfluidic technology, coded designs enable fibers to possess specific color sequences and stimulus-response patterns, thereby achieving multifunctional intelligent responses.

[0055] Furthermore, in some embodiments, the photoluminescent material is a quantum dot or a phosphor, and the concentration of the photoluminescent aqueous solution is 0.1–0.5 mg / ml; the quantum dot is a water-soluble quantum dot, preferably a CdSe / ZnS quantum dot or a CdTe / ZnS quantum dot; the phosphor is a photoluminescent phosphor, preferably a halide phosphor.

[0056] In the technical solutions of this application embodiment, quantum dots are semiconductor nanocrystals whose luminescence properties depend on their size and shape. The luminescence of quantum dots is due to the recombination of electrons and holes within the quantum dots. Quantum dots possess high luminescence efficiency, narrow emission spectra, and good color purity. They can emit light at different wavelengths, and the emission color can be adjusted by changing the size of the quantum dots. In smart fibers, quantum dots exhibit excellent luminescence performance and strong stability; furthermore, due to their small size, they can be more easily embedded into fibers. Phosphors are powders containing fluorescent substances; their luminescence occurs when electrons absorb light energy, transition from the ground state to an excited state, and then release light energy upon returning to the ground state.

[0057] Furthermore, in some embodiments, the mass percentage of sodium alginate in the blended spinning solution is 2-6 wt%; the mass percentage of photoluminescent material in the blended spinning solution is 0.16-0.8 wt%; and the stirring rate is 200-800 rpm.

[0058] In the technical solutions of this application embodiment, the concentration of sodium alginate has a significant impact on the strength and stability of the gel. Too low a concentration may lead to insufficient gel strength and easy fiber breakage; while too high a concentration may lead to an overly strong gel, affecting the flexibility and processability of the fiber. The mass percentage of photoluminescent material directly affects the luminous efficiency of the fiber. A low concentration may result in a low fluorescence value, while a high concentration may cause self-absorption, reducing luminous efficiency. By adjusting the mass percentage of photoluminescent material, the color and brightness of the fiber can be controlled. Different concentrations of photoluminescent material will produce different luminous effects. The concentration of photoluminescent material also affects the degree of fiber response to external stimuli. An appropriate concentration can ensure that the fiber exhibits obvious color changes under different stimuli. The prepared gel-like blend spinning solution is allowed to stand at room temperature for 20–28 hours to remove air bubbles.

[0059] Furthermore, in some embodiments, the mass percentage of the soluble metal ion salt in the coagulation bath is 3–5 wt%. The soluble metal ion salt is one of zinc ion salt, calcium ion salt, or a blend of zinc and calcium ions.

[0060] In the technical solutions of this application embodiment, the concentration of soluble metal ion salts has a significant impact on the coagulation process and final properties of the fiber. Too low a concentration may lead to insufficient cross-linking reaction and unstable fiber structure. A suitable concentration ensures sufficient cross-linking, forming fibers with good mechanical properties and stability. Too high a concentration may lead to over-cross-linking, making the fiber too stiff and brittle, affecting its flexibility and functionality.

[0061] The prepared coagulation bath should be left to stand for 0.5 to 1 hour for later use. The purpose of this standing process is to remove air bubbles.

[0062] Furthermore, in some embodiments, the coding design is carried out by taking each color of the blended spinning solution as a basic coding unit, and arranging and combining different basic coding units according to the principle of probability combination, starting from a single code and gradually increasing the complexity to carry out multi-level coding design.

[0063] In the technical solutions of this application embodiment, a large amount of information can be encoded in fibers through different combinations of colors. Each color or color combination represents a specific information bit. Different color combinations are unique and can serve as an identification marker for tracking, verification, or other purposes. The encoding design is not limited to color; it can also be combined with other fiber functionalities, such as humidity response, thereby expanding the application range of the fiber. By controlling the order and combination method of encoding, the encoding complexity and readability of the fiber can be precisely controlled.

[0064] Furthermore, in some embodiments, the injection rate of the co-blended spinning solution in the microfluidic spinning technology is 0.1–0.5 ml / min.

[0065] In the technical solution of this application embodiment, controlling the injection speed ensures that the diameter, uniformity, internal structure and functionality of the fiber meet the predetermined requirements.

[0066] Furthermore, in some embodiments, the twist rate of the twisting process is 2000-6000 rpm; the resulting multi-stimulus responsive smart fiber with controllable adjustment of color and brightness has a diameter of 70-120 μm and a length of 4-20 cm.

[0067] In the technical solution of this application embodiment, by controlling the number of twists in the twisting process, as well as the diameter and length of the prepared smart fiber, precise control over the physical properties and functional characteristics of the fiber can be achieved. This control not only ensures the controllable adjustment of the fiber's color and brightness, but also enables it to adapt to various stimulus response applications, thereby broadening the application range of smart fibers.

[0068] Secondly, embodiments of this application provide a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness, prepared by the method of the first aspect.

[0069] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0070] I. Preparation Method

[0071] Example 1

[0072] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness, including the following steps:

[0073] S1. Take three water-soluble CdSe / ZnS quantum dot solutions with different emission wavelengths, dilute them with deionized water, stir and dissolve to obtain photoluminescent aqueous solutions of different colors;

[0074] S2. Add 2wt% sodium alginate powder to the photoluminescent aqueous solutions of different colors obtained in step S1, stir at 200 rpm to obtain blended spinning solutions of different colors, and let stand at room temperature for 20 h.

[0075] S3. Dissolve zinc chloride in deionized water to obtain a coagulation bath with a zinc chloride weight percentage of 3wt%. Let the prepared zinc chloride coagulation bath stand for 0.5h for later use.

[0076] S4. A single-level coding design is adopted to obtain three monochrome fiber coding units;

[0077] S5. Following the coding sequence designed in step S4, the blended spinning solution obtained in step S2 is injected into the coagulation bath using microfluidic sequential spinning technology at a injection rate of 0.1 ml / min to obtain axially coded sodium alginate gel fibers; a schematic diagram of the microfluidic sequential spinning technology is shown below. Figure 1 As shown, different types of spinning solutions are sequentially passed through a multi-component spinning needle according to a predetermined coding order and injected into a zinc chloride coagulation bath. Sodium alginate gel fibers with axial coding are prepared by wet spinning process and continuously collected by a rotating drum device.

[0078] S6. The axially coded sodium alginate gel fibers obtained in step S5 are twisted at a twist rate of 2000 revolutions / meter to obtain three types of single-color coded smart fibers.

[0079] Figure 2 The SEM image of one type of monochrome encoded smart fiber shows that the surface of the quantum dot fiber is smooth, indicating that there are no obvious defects or particles attached to the fiber surface during the preparation process.

[0080] Example 2

[0081] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. Compared with Embodiment 1, the only difference is that a two-level coding design is adopted to obtain three smart fibers with dual-color coding. The rest is roughly the same as Embodiment 1, and will not be described again here.

[0082] Example 3

[0083] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. Compared with Embodiment 1, the only difference is that a three-level coding design is adopted to obtain three types of smart fibers with three-color coding. The rest is roughly the same as Embodiment 1, and will not be described again here.

[0084] Table 1 shows the fiber types and their complexity corresponding to the different levels of coding for smart fibers in Examples 1-3. The multi-level coding principle is as follows: Figure 3 As shown.

[0085] Table 1. Fiber types and complexity corresponding to different levels of coding in Examples 1-3

[0086] Example Encoding combination Fiber type Fiber complexity Example 1 (C1 3A1 3) / 2 Single monochromatic Low Example 2 (C2 3A2 3) / 2 Single-strand dual-color middle Example 3 (C3 3A3 3) / 2 Single strand three colors high

[0087] According to the principle of combinatorial probability, the complexity of fibers gradually increases with the increase of code order.

[0088] Figure 4The optical photographs of the fibers with axial coding in Examples 1-3 under ultraviolet light stimulation show that the fibers have axial coding information.

[0089] Example 4

[0090] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. Compared with Example 1, the only difference is that the amount of sodium alginate powder added is 4wt%, and the rest is roughly the same as Example 1, which will not be repeated here.

[0091] Example 5

[0092] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. Compared with Example 1, the only difference is that the amount of sodium alginate powder added is 6wt%, and the rest is roughly the same as Example 1, which will not be repeated here.

[0093] Example 6

[0094] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. Compared with Example 1, the only difference is that the amount of zinc chloride added is 5 wt%, and the rest is roughly the same as Example 1, which will not be repeated here.

[0095] Example 7

[0096] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. Compared with Embodiment 1, the only difference is that the twist number is 3000 rpm. The rest is roughly the same as Embodiment 1, and will not be repeated here.

[0097] Example 8

[0098] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. Compared with Embodiment 1, the only difference is that the twisting number is 4000 rpm. The rest is roughly the same as Embodiment 1 and will not be repeated here.

[0099] Example 9

[0100] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. Compared with Embodiment 1, the only difference is that the twist number is 5000 rpm. The rest is roughly the same as Embodiment 1 and will not be repeated here.

[0101] Example 10

[0102] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. Compared with Embodiment 1, the only difference is that the twist number is 6000 rpm. The rest is roughly the same as Embodiment 1 and will not be repeated here.

[0103] Comparative Example 1

[0104] Comparative Example 1 provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. The only difference from Example 1 is that the amount of sodium alginate powder added is 8 wt%. The rest is roughly the same as Example 1 and will not be repeated here.

[0105] Comparative Example 2

[0106] Comparative Example 2 provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. The only difference from Example 1 is that the amount of zinc chloride added is 8 wt%, and the rest is roughly the same as Example 1, which will not be repeated here.

[0107] Comparative Example 3

[0108] Comparative Example 3 provides a method for preparing a multi-stimulus responsive smart fiber with controllable adjustment of color and brightness. The only difference from Example 1 is that the twist number of the fiber twisting treatment is 1000 rpm. The rest is roughly the same as Example 1 and will not be repeated here.

[0109] II. Testing Methods

[0110] 1. SEM testing

[0111] The fibers prepared in Example 1 were examined using a scanning electron microscope (IT300-Jieoda).

[0112] 2. Humidity response test

[0113] Using a digital tachometer – Chint – the untwisting and retwisting rates of the fibers prepared in the examples and comparative examples were tested under humidity stimulation.

[0114] 3. Fluorescence characterization

[0115] The fibers prepared in the examples and comparative examples were tested using a fluorescence spectrophotometer F97pro-Prism.

[0116] III. Analysis of Test Results for Each Embodiment and Comparative Example

[0117] The fluorescence test data of the smart fibers in Examples 1, 4, 5 and Comparative Example 1 are shown in Table 2:

[0118] Table 2. Fluorescence test data of the smart fibers in Examples 1, 4, 5 and Comparative Example 1.

[0119] Example Sodium alginate mass fraction (wt%) Fluorescence value (au) Example 1 2 270 Example 4 4 320 Example 5 6 370 Comparative Example 1 8 200

[0120] It can be seen that the fluorescence value of the smart fiber first increases and then decreases with the increase of sodium alginate mass fraction. The fluorescence intensity is high when the sodium alginate mass fraction is 6 wt%, while the fluorescence value decreases when the mass fraction is 8 wt%, which may be due to insufficient cross-linking between high concentration sodium alginate and metal ions.

[0121] The fluorescence test data of the smart fibers in Examples 1, 6 and Comparative Example 2 are shown in Table 3:

[0122] Table 3. Fluorescence test data of smart fibers in Examples 1, 6 and Comparative Example 2.

[0123] Example Zinc chloride mass fraction (wt%) Fluorescence value (au) Example 1 3 270 Example 6 5 380 Comparative Example 2 8 300

[0124] It can be seen that as the mass fraction of zinc chloride increases, the fluorescence value of the smart fiber shows a trend of first increasing and then decreasing, indicating that the fluorescence is strongest when the mass fraction of zinc chloride is 5wt%, and excessive cross-linking will inhibit the AIE phenomenon.

[0125] The UV and humidity-driven detection results of smart fibers with different twist rates are shown in Table 4:

[0126] Table 4. UV and humidity-driven detection results of smart fibers with different twist rates.

[0127]

[0128] It can be seen that the smart fiber prepared by the experimental method of this application can rotate at high speed under moderate stimulation, and the greater the twist number, the greater the response speed; the higher the twist number, the higher the fluorescence value.

[0129] Figure 5 The fluorescence spectrum of the smart fiber in Example 1 of this application shows that different photoluminescent fibers emit different wavelengths.

[0130] Figure 6 The images show the fluorescence spectra of the smart fibers in Examples 1 and 8 of this application. It can be seen that the fluorescence intensity of smart fibers with different twist numbers is different, and the higher the twist number, the higher the fluorescence value.

[0131] Figure 7 These are optical photographs of the smart fibers in Examples 1 and 8 of this application under ultraviolet light irradiation. It can be seen that under ultraviolet light irradiation, the brightness of fibers with a high twist number is stronger than that of fibers with a low twist number.

[0132] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A method for preparing a multi-stimuli responsive smart fiber with controllable adjustment of color and brightness, characterized in that, The method comprises the following steps: S1. Taking different color photoluminescent materials, respectively diluting with deionized water, stirring and dissolving to obtain different color photoluminescent aqueous solutions; the photoluminescent material is quantum dots or fluorescent powder, and the concentration of the photoluminescent aqueous solution is 0.1-0.5 mg / ml; S2. Adding a predetermined amount of sodium alginate powder into the different color photoluminescent aqueous solutions obtained in step S1, respectively stirring uniformly to obtain different color sodium alginate and photoluminescent material blending spinning solutions; S3. Dissolving a soluble metal ion salt in deionized water to obtain a coagulation bath; the soluble metal ion salt is one of a zinc ion salt, a calcium ion salt, and a blending salt of zinc ions and calcium ions; S4. Encoding design is performed on the fibers by establishing a mathematical model; the encoding design is performed in the following manner: taking each color blending spinning solution as a basic encoding unit, arranging and combining different basic encoding units according to the probability combination principle, starting from a single code, gradually increasing complexity, and performing multi-stage encoding design; S5. According to the encoding sequence designed in step S4, the blending spinning solution obtained in step S2 is injected into the coagulation bath using a microfluidic sequential spinning technology to obtain an axially encoded sodium alginate gel-state fiber; S6. The axially encoded sodium alginate gel-state fiber obtained in step S5 is subjected to a twisting treatment to obtain a multi-stimulus response smart fiber with controllable color and brightness adjustment.

2. The method for preparing multi-stimulus responsive smart fibers with controllable adjustment of color and brightness according to claim 1, characterized in that, In step S1, the quantum dots are water-soluble quantum dots; and the fluorescent powder is a photoluminescent fluorescent powder.

3. The method for preparing multi-stimulus responsive smart fibers with controllable adjustment of color and brightness according to claim 1, characterized in that, In step S2, the mass percentage of sodium alginate in the blending spinning solution is 2-6 wt%; And / or, the mass percentage of photoluminescent material in the blending spinning solution is 0.16-0.8 wt%.

4. The method for preparing multi-stimulus responsive smart fibers with controllable adjustment of color and brightness according to claim 3, characterized in that, The stirring rate is 200-800 rpm.

5. The method for preparing multi-stimulus responsive smart fibers with controllable adjustment of color and brightness according to claim 1, characterized in that, In step S3, the mass percentage of the soluble metal ion salt in the coagulation bath is 3-5 wt%.

6. The method for preparing multi-stimulus responsive smart fibers with controllable adjustment of color and brightness according to claim 1, characterized in that, In step S5, the push injection speed of the blending spinning solution is 0.1-0.5 ml / min.

7. The method for preparing multi-stimulus responsive smart fibers with controllable adjustment of color and brightness according to claim 1, characterized in that, In step S6, the twist number of the twisting treatment is 2000-6000 turns / m; And / or, the obtained multi-stimulus response smart fiber with controllable color and brightness adjustment has a diameter of 70-120 μm and a length of 4-20 cm.

8. A multi-stimuli responsive smart fiber with controllable adjustment of color and brightness, characterized in that, Prepared by the method of any one of claims 1-7.

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