Silk fiber membrane, preparation method and flexible wearable electronics

Abstract

The invention relates to the technical field of wearable electronics, in particular to a silk fiber membrane, a preparation method and a flexible wearable electron. The preparation method of the silk fiber membrane comprises the following steps: providing a plurality of groups of silk fibroin fibers with different gram weights and a solvent, and putting the silk fibroin fibers into the solvent for stretching treatment; performing first drying treatment on the stretched silk fibroin fibers to obtain a plurality of silk fibroin fiber films; cutting each silk fibroin fiber film into fiber film blocks with the same size, wherein the fiber distribution densities of the fiber film blocks are different; providing hydroxylated titanium carbide solutions with various concentrations; and coating each fiber film block with hydroxylated titanium carbide solutions with different concentrations, and then carrying out second drying treatment to obtain the silk fiber film. The problem that a traditional silk fiber membrane is low in piezoelectric sensitivity is solved.

Description

[Technical field]

[0001] The present invention relates to the technical field of wearable electronics, and in particular to a silk fiber membrane, a preparation method and flexible wearable electronics. [Background technology]

[0002] Traditional electrospinning films cannot produce films with sparse fiber structures and support. Silk fiber membranes can fit well with the skin due to their natural flexibility and adjustable fiber distribution density. They are used in pressure sensing, touch sensing and other fields to achieve sensitive pressure sensing. Existing silk fiber membranes usually use silk protein dissolved in a solvent (such as lithium bromine, potassium chloride solution, etc.), which is then spun into silk by wet spinning, and then the membrane is obtained by solvent evaporation or water bath coagulation. Wet spinning has high production efficiency and can produce silk membranes with larger areas. However, when the fiber membranes produced by this method are used in wearable electronics, they usually have weaker piezoelectric sensitivity and a narrower pressure detection range. [Summary of the invention]

[0003] In order to solve the problem of weak piezoelectric sensitivity of traditional silk fiber membranes, the present invention provides a silk fiber membrane, a preparation method and flexible wearable electronics.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for preparing a silk fiber membrane, comprising the following steps:

[0005] Providing multiple groups of silk fibroin fibers with different weights and solvents, placing the silk fibroin fibers in the solvent for stretching treatment;

[0006] The stretched silk fibroin fibers are subjected to a first drying process to obtain a plurality of silk fibroin fiber films;

[0007] Each silk fibroin fiber film is cut into fiber film blocks of the same size, and the fiber distribution density of each fiber film block is different;

[0008] Provides hydroxylated titanium carbide solutions in various concentrations;

[0009] A hydroxylated titanium carbide solution of different concentrations is coated on each fiber film block and then subjected to a second drying process to obtain a silk fiber membrane.

[0010] Preferably, providing multiple groups of silk fibroin fibers of different weights comprises:

[0011] Providing silk and cutting the silk into silk fragments;

[0012] Providing a sodium carbonate solution, soaking the silk fragments in the sodium carbonate solution and then heating them in a water bath for 35 to 40 minutes to obtain prefabricated fibers;

[0013] Deionized water is provided, the prefabricated fiber is taken out from the sodium carbonate solution, and the prefabricated fiber is washed with deionized water to obtain the silk fibroin fiber.

[0014] Preferably, placing the silk fibroin fiber in a solvent for stretching treatment comprises:

[0015] A culture container and deionized water are provided, the deionized water is placed in the culture container, silk fibroin fibers of different gram weights are placed in the deionized water, and both ends of the silk fibroin fibers are stretched.

[0016] Preferably, the weight ratio of the silk fibroin fibers with the highest weight to the silk fibroin fibers with the lowest weight in the multiple groups of silk fibroin fibers with different weights is in the range of 3-10.

[0017] Preferably, performing the first drying process comprises:

[0018] A vacuum drying oven is provided to place the stretched silk fibroin fibers in a vacuum environment at 38-40° C. and dry them for 23-24 hours to obtain a silk fibroin fiber film.

[0019] Preferably, the concentration of the hydroxylated titanium carbide solution in the hydroxylated titanium carbide solutions of various concentrations ranges from 1 to 4 mg / mL.

[0020] Preferably, performing the second drying process comprises:

[0021] A vacuum drying oven is provided to place the stretched silk fibroin fibers in a vacuum environment at 38-40° C. and dry them for 23-24 hours to obtain a silk fiber membrane.

[0022] In order to solve the above technical problems, the present invention provides another technical solution as follows: a silk fiber membrane is prepared by the above silk fiber membrane preparation method.

[0023] In order to solve the above technical problems, the present invention provides another technical solution as follows: a flexible wearable electronic device, comprising a covering layer, a connecting layer, an adhesive layer and the above-mentioned silk fiber membrane, the connecting layer is arranged on both sides of the silk fiber membrane to form a piezoresistive module, the piezoresistive module is placed in the covering layer, the adhesive layer is arranged on the surface of the covering layer, and the two connecting layers pass through the covering layer and the adhesive layer in sequence to connect with external equipment.

[0024] Preferably, the thickness of the flexible wearable electronics is 220 to 310 microns.

[0025] Compared with the prior art, the silk fiber membrane, preparation method and flexible wearable electronics provided by the present invention have the following beneficial effects:

[0026] 1. A method for preparing a silk fiber membrane provided in an embodiment of the present invention comprises the following steps:

[0027] Providing multiple groups of silk fibroin fibers with different weights and solvents, placing the silk fibroin fibers in the solvent for stretching treatment;

[0028] The stretched silk fibroin fibers are subjected to a first drying process to obtain a plurality of silk fibroin fiber films;

[0029] Each silk fibroin fiber film is cut into fiber film blocks of the same size, and the fiber distribution density of each fiber film block is different;

[0030] Provides hydroxylated titanium carbide solutions in various concentrations;

[0031] A hydroxylated titanium carbide solution of different concentrations is coated on each fiber film block and then dried for a second time to obtain a silk fiber membrane. The silk fiber membrane prepared in this embodiment has holes and is in a mesh shape as a whole, and can be self-supporting. The silk fiber membrane has good flexibility, and the wearable electronics prepared therefrom can be closely attached to the surface of human skin.

[0032] 2. The embodiment of the present invention provides multiple groups of silk fibroin fibers of different weights, including:

[0033] Providing silk and cutting the silk into silk fragments;

[0034] Providing a sodium carbonate solution, soaking the silk fragments in the sodium carbonate solution and then heating them in a water bath for 35 to 40 minutes to obtain prefabricated fibers;

[0035] Deionized water is provided, the prefabricated fiber is taken out from the sodium carbonate solution, and the prefabricated fiber is cleaned by deionization to obtain the silk fibroin fiber. The operation process is simple and convenient.

[0036] 3. In the embodiment of the present invention, placing the silk fibroin fiber in a solvent for stretching includes:

[0037] A culture container and deionized water are provided, the deionized water is placed in the culture container, and silk fibroin fibers of different gram weights are placed in the deionized water, and both ends of the silk fibroin fibers are stretched. The stretching method is simple and convenient, making the stretched silk fibroin fibers easier to disperse.

[0038] 4. The weight ratio of the silk fibroin fiber with the highest weight to the silk fibroin fiber with the lowest weight in the multiple groups of silk fibroin fibers with different weights described in the embodiment of the present invention is in the range of 3 to 10. By selecting a reasonable weight, the silk fiber membrane finally formed has better flexibility and support.

[0039] 5. The first drying process in the embodiment of the present invention includes:

[0040] A vacuum drying oven is provided to place the stretched silk fibroin fibers in a vacuum environment at 38 to 40° C. and dry them for 23 to 24 hours to obtain a silk fibroin fiber film. Since the silk fibroin fibers are interwoven together to present a mesh shape, moisture inside the silk fibroin fibers can be effectively removed after drying.

[0041] 6. The concentration range of the hydroxylated titanium carbide solution in the hydroxylated titanium carbide solution of various concentrations in the embodiment of the present invention is 1-4 mg / mL. The silk fiber membrane prepared in this embodiment is prepared by adjusting the fiber distribution density inside the silk fiber membrane and the concentration of the hydroxylated titanium carbide solution, thereby obtaining a silk fiber membrane with a wide pressure detection range and high sensitivity under different pressure responses.

[0042] 7. The second drying process in the embodiment of the present invention includes:

[0043] A vacuum drying oven is provided to place the stretched silk fibroin fibers in a vacuum environment at 38-40° C. for 23-24 hours to obtain a silk fiber membrane. Since the fibers in the fiber membrane block are interwoven to present a mesh shape, moisture inside the fibers in the fiber membrane block can be effectively removed after drying.

[0044] 8. The embodiment of the present invention also provides a silk fiber membrane, which has the same beneficial effects as the above-mentioned method for preparing the silk fiber membrane, and will not be described in detail here.

[0045] 9. An embodiment of the present invention also provides a flexible wearable electronic device having the same beneficial effects as the above-mentioned silk fiber membrane, which will not be described in detail here.

Brief Description of the Drawings

[0046] Figure 1 It is a schematic flow chart of a method for preparing a silk fiber membrane provided in the first embodiment of the present invention.

[0047] Figure 2 This is a protein molecular structure diagram of silk provided by the first embodiment of the present invention.

[0048] Figure 3 It is a partial structural diagram of the flexible wearable electronic device 1 provided in the third embodiment of the present invention.

[0049] Figure 4 It is a molecular structure diagram of a silk fiber membrane provided by the present invention.

[0050] Description of the accompanying drawings:

[0051] 1. Flexible wearable electronics;

[0052] 11. Coating layer; 12. Connecting layer; 13. Silk fiber membrane; 14. Piezoresistive module. [Specific implementation method]

[0053] In order to make the purpose, technical solution 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 implementation examples. 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.

[0054] In the embodiments provided by the present invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0055] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present invention.

[0056] In various embodiments of the present invention, it should be understood that the size of the serial numbers of the above-mentioned processes does not mean the necessary order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0057] The flow chart and block diagram in the accompanying drawings of the present invention illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a sequence different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which is determined based on the functions involved. It should be particularly noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs a specified function or operation, or can be implemented by a combination of dedicated hardware and computer instructions.

[0058] See also Figure 1In order to solve the problem that the existing fiber membrane is thick and has low sensitivity to pressure, the first embodiment of the present invention provides a method for preparing a silk fiber membrane, comprising the following steps:

[0059] S1, providing a plurality of groups of silk fibroin fibers with different weights and solvents, and placing the silk fibroin fibers in the solvent for stretching treatment;

[0060] S2, performing a first drying treatment on the stretched silk fibroin fibers to obtain a plurality of silk fibroin fiber films;

[0061] S3, cutting each silk fibroin fiber film into fiber film blocks of the same size, and the fiber distribution density of each fiber film block is different;

[0062] S4, providing hydroxylated titanium carbide solutions of various concentrations;

[0063] S5, coating each fiber film block with a hydroxylated titanium carbide solution of different concentrations and then performing a second drying process to obtain a silk fiber membrane.

[0064] Understandably, please also refer to Figure 2, silk fibroin fiber is a fiber polymerized from silk fibroin, and has good biocompatibility and biodegradability. In this embodiment, the silk fibroin fiber is first placed in a solvent, and then the silk fibroin fiber in the solvent is stretched. Optionally, the stretched silk fibroin fiber can be stretched manually or by a machine. Specifically, during stretching, in one embodiment, the same force can be provided to the silk fibroin fiber each time it is stretched, so that the two ends of the silk fibroin fiber when stretched are extended in two directions. In another embodiment, different forces can be provided to the silk fibroin fiber each time it is stretched, resulting in different lengths of the stretched silk fibroin fiber each time. It should be noted that the silk fibroin fiber is stretched to enhance its dispersibility so that the stretched silk fibroin fiber is better dispersed in the solvent. Further, after stretching, the stretched silk fibroin fiber can be subjected to a first drying treatment to obtain a silk fibroin fiber film. Specifically, each silk fibroin fiber film is cut into fiber film blocks of the same size, and the fiber distribution density of each fiber film block is different. Exemplarily, the silk fibroin fiber film is cut into small pieces of 4cmx4cm. The fiber distribution density of small piece 1 is 80g / m2, the fiber distribution density of small piece 2 is 150g / m2, and the fiber distribution density of small piece 3 is 240g / m2. It should be understood that due to the different weights of silk fibroin fibers, the fiber film blocks eventually present different fiber densities. Further, hydroxylated titanium carbide solutions of different concentrations are applied to each fiber film block, and a second drying process is performed after the hydroxylated titanium carbide solution (also known as MXene solution) to obtain a silk fiber film. It should be understood that the main components of the hydroxylated titanium carbide solution (also known as MXene solution) include MXene nanosheets, solvents and surfactants. When the MXene solution is applied to the fiber film block, the MXene solution and the silk fiber film have hydrogen bonding, so that they are combined with each other to finally form a silk fiber film with high piezoelectric sensitivity. Specifically, the silk fiber membrane prepared in this embodiment has holes and is mesh-shaped as a whole, and can be self-supporting. The silk fiber membrane has good flexibility, and the wearable electronics prepared therefrom can be closely attached to the surface of human skin.

[0065] Furthermore, in the above steps, providing multiple groups of silk fibroin fibers with different weights includes:

[0066] Providing silk and cutting the silk into silk fragments;

[0067] Providing a sodium carbonate solution, soaking the silk fragments in the sodium carbonate solution and then heating them in a water bath for 35 to 40 minutes to obtain prefabricated fibers;

[0068] Deionized water is provided, the prefabricated fiber is taken out from the sodium carbonate solution, and the prefabricated fiber is washed with deionized water to obtain the silk fibroin fiber.

[0069] It can be understood that the protein molecular structure of silk provided in this embodiment is as follows Figure 2 As shown. It should be understood that the silk provided in this embodiment is flexible and can fit well with human skin. In order to improve its dispersion ability. When cutting the silk into pieces, there is no need to control the size of the silk fragments. The purpose of cutting is to facilitate subsequent stretching work. After soaking the silk fragments in a sodium carbonate solution, heat them in a water bath for 35 to 40 minutes to ensure that the sericin in the silk is completely removed to obtain prefabricated fibers. Furthermore, the degummed prefabricated fibers are repeatedly washed with deionized water to obtain silk fibroin fibers. The operation process is simple and convenient.

[0070] Furthermore, in the above step S2, placing the silk fibroin fibers in a solvent for stretching treatment includes:

[0071] A culture container and deionized water are provided, the deionized water is placed in the culture container, silk fibroin fibers of different gram weights are placed in the deionized water, and both ends of the silk fibroin fibers are stretched.

[0072] It should be understood that when the two ends of the silk fibroin fiber are stretched, human stretching can be adopted, or a machine can be used to clamp the two ends of the silk fibroin fiber and stretch it. The above-mentioned solvent is preferably deionized water, and specifically, after the silk fibroin fiber is stretched with the assistance of deionized water, it is completely dispersed in the culture container.

[0073] Furthermore, the weight ratio of the silk fibroin fiber with the highest weight to the silk fibroin fiber with the lowest weight in the multiple groups of silk fibroin fibers with different weights is in the range of 3 to 10. It should be understood that the silk fibroin fibers with different weights are selected to allow the obtained silk fiber membrane to present different fiber distribution densities. If the weight difference in the selected silk fibroin fibers is too large, the thickness of the silk fiber membrane finally formed will vary greatly. Therefore, it is preferred that the weight ratio of the silk fibroin fiber with the highest weight to the silk fibroin fiber with the lowest weight is in the range of 3 to 10. The weight ratio of the silk fibroin fiber with the highest weight to the silk fibroin fiber with the lowest weight can also be 3, 4, 5, 8 or 10.

[0074] It should be noted that the lowest gram weight in the silk fibroin fiber should not be too low. If it is too low, the fiber distribution density in the silk fiber film finally formed is low, that is, the strength provided by the fiber is small, which will cause the silk fiber film to lack support. If the gram weight in the silk fibroin fiber is too high, the thickness of the silk fiber film finally formed will be too thick, which will cause poor flexibility and poor conformability to human skin. Exemplarily, three groups of silk fibroin fibers are selected, and their gram weights are 0.012g, 0.024g, and 0.036g respectively. It can be seen that the gram weight ratio of the silk fibroin fiber with the highest gram weight and the silk fibroin fiber with the lowest gram weight in the three groups of silk fibroin fibers is 3.

[0075] Furthermore, in the above step S2, performing the first drying process includes:

[0076] A vacuum drying oven is provided, and the stretched silk fibroin fibers are placed in a vacuum environment at 38-40° C. and dried for 23-24 hours to obtain a silk fibroin fiber film. It can be understood that since the silk fibroin fibers are interwoven together to present a mesh shape, moisture inside the silk fibroin fibers can be effectively removed after drying.

[0077] Specifically, the concentration of the hydroxylated titanium carbide solution in the hydroxylated titanium carbide solutions of various concentrations ranges from 1 to 4 mg / mL.

[0078] It can be understood that in step S 3, since each silk fibroin fiber film is cut into fiber film blocks of the same size, this will cause the silk fibroin fiber films formed by stretching silk fibroin fibers of different gram weights to have different fiber distribution densities. Exemplarily, three groups of silk fibroin fibers are selected, and their gram weights are 0.012g, 0.024g, and 0.036g, respectively, and the three silk fibroin fiber films are cut into small blocks of 4cmx4cm. The fiber distribution density of small block 1 is 80g / m2, the fiber distribution density of small block 2 is 150g / m2, and the fiber distribution density of small block 3 is 240g / m2. When the hydroxylated titanium carbide solution is applied to each fiber film block, the hydroxylated titanium carbide solution of different concentrations can be applied to the fiber film blocks with different fiber distribution densities.

[0079] It should be noted that when the concentration of hydroxylated titanium carbide solution is too high, the initial resistance value of the silk fiber membrane will be small. When the silk fiber membrane is under pressure, the silk fiber membrane will deform, changing the charge distribution and conductive path, thereby reducing the resistance and the maximum voltage or current response that can be generated when under pressure, and the response to pressure is low. When the concentration of hydroxylated titanium carbide solution is too low, the initial resistance value of the silk fiber membrane will be too large. When the silk fiber membrane is under pressure, the silk fiber membrane is not conductive and cannot reflect the force conditions. Therefore, by reasonably regulating the concentration range of hydroxylated titanium carbide solution, the piezoelectric sensitivity of the silk fiber membrane can be effectively improved.

[0080] Furthermore, in the above step S5, performing a second drying process includes:

[0081] A vacuum drying oven is provided, and the stretched silk fibroin fibers are placed in a vacuum environment at 38 to 40° C. and dried for 23 to 24 hours to obtain a silk fiber film. It can be understood that since the fibers in the fiber film block are interwoven together to present a mesh shape, moisture inside the fibers in the fiber film block can be effectively removed after drying.

[0082] It should be noted that the silk fiber membrane prepared in this embodiment is prepared by adjusting the fiber distribution density inside the silk fiber membrane and the concentration of the hydroxylated titanium carbide solution. Among them, if the fiber distribution density is too high, the greater the fiber thickness, the greater the response time, and the sensitivity decreases. If the fiber distribution density is too low, the gaps between the fibers are too large, which will lead to sparse fiber distribution. When it is actually applied to wearable electronics, it will cause the electrodes on both sides of the silk fiber membrane to easily contact and conduct with each other.

[0083] In order to demonstrate that the silk fiber membrane prepared in this embodiment has excellent sensitivity, the following examples are provided:

[0084] Table 1: Sensitivity and detection range obtained for 80g / m2 silk fiber membrane with fiber density distribution:

[0085]

[0086]

[0087] Table 2: Sensitivity and detection range obtained for silk fiber membrane with fiber density distribution of 150g / m2:

[0088] pressure △I / I error 0.12 0.50592 0.01041 0.2 1.76662 0.1401 0.3 2.96734 0.07794 0.4 4.4006 0.1455 0.5 6.918 0.0408 0.6 10.49888 0.27915 0.7 12.99928 0.43004 0.8 15.80606 0.80925 0.9 19.216 0.27113 1 22.3761 0.42548 2 46.56696 0.50325 3 75.48262 0.7606 5 109.266 1.22445 7 195.09268 3.84201 10 320.65012 5.92522 12 372.0468 9.36326 15 397.7122 17.63177 20 458.3049 23.51721

[0089] Table 3: Sensitivity and detection range obtained for 240g / m2 silk fiber membrane with fiber density distribution:

[0090] pressure △I / I error 0.12 0.45548 0.02349 0.2 0.75616 0.03929 0.3 3.48256 0.18655 0.4 4.55742 0.17122 0.5 5.69214 0.13307 0.6 6.54206 0.16933 0.7 8.6557 0.23711 0.8 9.42588 0.23784 0.9 11.8214 0.16082 1 14.5781 0.26112 2 17.29176 0.25849 3 30.4267 0.88241 5 65.60348 0.58854 7 105.649 3.09021 10 143.99546 2.01886 12 181.6262 0.75745 15 250.84614 1.30957 20 304.71722 9.23247

[0091] Please combine Table 1, Table 2 and Table 3, where △I / I represents the ratio of the current change rate to the current, and error is the error bar. Combining the data of Table 1, Table 2 and Table 3, it can be seen that the silk fiber membrane with different fiber distribution densities provided in this embodiment has both a wide pressure detection range and high sensitivity in response to different pressures.

[0092] The second embodiment of the present invention further provides a silk fiber membrane, which is prepared by the above-mentioned method for preparing the silk fiber membrane.

[0093] The silk fiber membrane provided in the embodiment of the present invention has the same beneficial effects as the above-mentioned method for preparing the silk fiber membrane, which will not be described in detail here.

[0094] Please combine Figure 1 , Figure 3 and Figure 4The third embodiment of the present invention further provides a flexible wearable electronic device 1, which includes a covering layer 11, a connecting layer 12, an adhesive layer and the above-mentioned silk fiber film 13. The connecting layers 12 are arranged on both sides of the silk fiber film 13 to form a piezoresistive module 14. The piezoresistive module 14 is placed in the covering layer 11. The surface of the covering layer 11 is provided with an adhesive layer. The two connecting layers 12 pass through the covering layer 11 and the adhesive layer in turn to connect with external equipment.

[0095] It can be understood that the adhesive layer can be attached to the human body surface and a medical polyurethane (Pu) film can be selected. When the human skin is deformed, the force is transmitted to the silk fiber membrane 13 through the adhesive layer, the coating layer 11 and the connecting layer 12 in sequence, forcing the silk fiber membrane 13 to deform, thereby generating a response to pressure. Since the silk fiber membrane 13 provided in this embodiment has the characteristics of being thin, and it has both a wide pressure detection range and high sensitivity, it can be well applied to the field of flexible wearable electronics 1.

[0096] Please combine Figure 3 It is a schematic diagram of some structures in the flexible wearable electronics 1. Specifically, the thickness of the flexible wearable electronics 1 is 220 to 320 microns. It should be understood that the connection layer 12 provided in this embodiment is a metal electrode with a thickness of about 100nm, and the coating layer 11 is polydimethylsiloxane (PDMS). It should be noted that, in addition to the sensitive layer, the gold electrode is deposited on the flexible film to form a flexible electrode. There are many flexible films to choose from, including PI (polyimide) and PET (polyethylene terephthalate) in addition to PDMS. In addition, in addition to the above-mentioned upper and lower electrode structures, the electrode can also be replaced with a forked electrode. The thickness of the coating layer 11 is 70 to 100 microns, the thickness of the silk fiber membrane 13 is 40 to 50 microns, and the thickness of the adhesive layer is 10 to 30 microns. By reasonably selecting the coating layer 11, the connection layer 12, and the adhesive layer, the flexible wearable electronics 1 formed by combining them with the silk fiber membrane 13 has an ultra-thin thickness. That is, the flexible wearable electronic device 1 provided in this embodiment can be better attached to the surface of human skin.

[0097] The above is a detailed introduction to a silk fiber membrane, a preparation method and flexible wearable electronics disclosed in the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a silk fiber membrane, characterized in that: The following steps are involved: Providing multiple groups of silk fibroin fibers with different weights and solvents, placing the silk fibroin fibers in the solvent for stretching treatment; The stretched silk fibroin fibers are subjected to a first drying process to obtain a plurality of silk fibroin fiber films; Each silk fibroin fiber film is cut into fiber film blocks of the same size, and the fiber distribution density of each fiber film block is different; Provides hydroxylated titanium carbide solutions in various concentrations; A hydroxylated titanium carbide solution of different concentrations is coated on each fiber film block and then subjected to a second drying process to obtain a silk fiber membrane.

2. The method for preparing the silk fiber membrane according to claim 1, characterized in that: There are several groups of silk fibroin fibers available in different weights including: Providing silk and cutting the silk into silk fragments; Providing a sodium carbonate solution, soaking the silk fragments in the sodium carbonate solution and then heating them in a water bath for 35 to 40 minutes to obtain prefabricated fibers; Deionized water is provided, the prefabricated fiber is taken out from the sodium carbonate solution, and the prefabricated fiber is washed with deionized water to obtain the silk fibroin fiber.

3. The method for preparing the silk fiber membrane according to claim 1, characterized in that: The stretching process of placing the silk fibroin fiber in a solvent includes: A culture container and deionized water are provided, the deionized water is placed in the culture container, silk fibroin fibers of different gram weights are placed in the deionized water, and both ends of the silk fibroin fibers are stretched.

4. The method for preparing the silk fiber membrane according to claim 2, characterized in that: The weight ratio of the silk fibroin fiber with the highest weight to the silk fibroin fiber with the lowest weight in the multiple groups of silk fibroin fibers with different weights ranges from 3 to 10.

5. The method for preparing the silk fiber membrane according to claim 1, characterized in that: The first drying process includes: A vacuum drying oven is provided to place the stretched silk fibroin fibers in a vacuum environment at 38-40° C. and dry them for 23-24 hours to obtain a silk fibroin fiber film.

6. The method for preparing the silk fiber membrane according to claim 1, characterized in that: The concentration of the hydroxylated titanium carbide solution in the hydroxylated titanium carbide solutions of various concentrations ranges from 1 to 4 mg / mL.

7. The method for preparing the silk fiber membrane according to claim 1, characterized in that: The second drying process includes: A vacuum drying oven is provided to place the stretched silk fibroin fibers in a vacuum environment at 38-40° C. and dry them for 23-24 hours to obtain a silk fiber membrane.

8. A silk fiber membrane, characterized in that: The silk fiber membrane is prepared by the method for preparing the silk fiber membrane as described in any one of claims 1 to 7.

9. A flexible wearable electronic device, characterized in that: The flexible wearable electronics include a coating layer, a connecting layer, an adhesive layer and a silk fiber membrane as claimed in claim 8, the connecting layer is arranged on both sides of the silk fiber membrane to form a piezoresistive module in combination, the piezoresistive module is placed in the coating layer, the adhesive layer is arranged on the surface of the coating layer, and the two connecting layers pass through the coating layer and the adhesive layer in sequence to connect with external equipment.

10. A flexible wearable electronic device, characterized in that: The thickness of the flexible wearable electronics is 210 to 310 microns.

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