Preparation method of composite degradable TIEL aerogel

Abstract

The invention provides a preparation method of composite degradable TIEL aerogel, and relates to the technical field of production of TIEL aerogel. The preparation method of the composite degradable TIEL aerogel comprises the following steps: S1, firstly, preparing a culture medium, and dissolving 20g / L of glucose, 5g / L of yeast extract, 5g / L of peptone, 2.7 g / L of Na2.HPO4, 0.5 g / L of MgSO4. 7H2O and 1.5 g / L of citric acid in deionized water; s2, adjusting the pH value of the culture medium with HCl, then performing high-temperature sterilization treatment on the culture medium, cooling the culture medium to room temperature, inoculating pre-cultured acetobacter aceti into the culture medium, performing static culture for 7 days at 30 DEG C, then repeatedly cleaning the harvested film with deionized water, and removing impurities with an alkaline solution to obtain a fresh bacterial cellulose film. According to the cellulose aerogel, chitosan is introduced as a natural electron donor, so that the triboelectric property of the cellulose aerogel is optimized, and meanwhile, the degradability is kept.

Description

Technical Field

[0001] The present invention relates to the technical field of TIEL aerogel production, and specifically to a preparation method of a composite degradable TIEL aerogel. Background Art

[0002] Triboelectroluminescence (TIEL) technology is widely used in self-powered visual sensors, such as pressure sensors, acoustic sensors, and human-computer interaction devices. In the prior art, TIEL materials mostly use synthetic polymers (such as PVDF, PMMA, PDMS, etc.) as triboelectric layers, combined with electroluminescent materials (such as ZnS:Cu) to achieve the conversion of mechanical stimuli to optical signals.

[0003] Disadvantages of the prior art:

[0004] 1. Unsustainable materials: Traditional TIEL materials rely on synthetic polymers (such as PVDF, PDMS), which are non-renewable and difficult to degrade, not meeting the environmental protection requirements.

[0005] 2. Limited performance: The triboelectric performance of synthetic polymers is limited by the electron donor / acceptor ability, resulting in low charge transfer efficiency and insufficient TIEL intensity. In high-temperature (>50°C) or high-humidity (RH>60%) environments, the material is prone to charge leakage and has poor stability.

[0006] 3. Insufficient sensitivity: The electric field distribution of traditional electrode designs (such as parallel electrodes) is uneven, making it difficult to capture weak mechanical signals (such as acoustic vibrations). Summary of the Invention

[0007] (1) Technical problems to be solved

[0008] In view of the deficiencies of the prior art, the present invention provides a preparation method of a composite degradable TIEL aerogel, solving the defects and deficiencies existing in the prior art.

[0009] (2) Technical solutions

[0010] To achieve the above objectives, the present invention is realized through the following technical solutions: A preparation method of a composite degradable TIEL aerogel, the method comprising the following steps:

[0011] S1. First, prepare a culture medium by dissolving 20 g / L glucose, 5 g / L yeast extract, 5 g / L peptone, 2.7 g / L Na 2 ·HPO 4 、0.5 g / L MgSO 4 ·7H 2 O and 1.5 g / L citric acid in deionized water;

[0012] S2. Adjust the pH of the above medium with HCl, then perform high-temperature sterilization on the medium. After cooling to room temperature, inoculate the pre-cultured acetic acid bacteria into the medium and statically culture at 30 °C for 7 days. Subsequently, repeatedly wash the harvested membrane with deionized water and remove impurities with an alkaline solution to obtain a fresh bacterial cellulose film;

[0013] S3. Then, cut the obtained bacterial cellulose film into small pieces and soak them in deionized water. After swelling at room temperature for 24 hours, the bacterial cellulose film absorbs water to form a translucent gel-like structure;

[0014] S4. Next, add appropriate amounts of ZnS:Cu phosphor, chitosan, alginate, and deionized water according to experimental needs. After fully stirring the mixture, dry the water at an appropriate temperature. Finally, obtain PZC, ZCC, and ZCCA aerogels.

[0015] Preferably, the pH value adjusted with HCl in step 2 is 5.5.

[0016] Preferably, the temperature of the high-pressure sterilization treatment of the medium in step 2 is 121 °C, and the high-pressure sterilization treatment time is 20 minutes.

[0017] Preferably, the size of the small pieces cut from the bacterial cellulose film in step 3 is 1 cm × 1 cm, with an error not exceeding 0.1 cm.

[0018] (III) Beneficial effects

[0019] The present invention provides a preparation method of a composite degradable TIEL aerogel. It has the following beneficial effects:

[0020] 1. In the present invention, chitosan is introduced as a natural electron donor to optimize the triboelectric performance of the cellulose aerogel while maintaining degradability.

[0021] 2. In the present invention, through the hydrophobic group and hydrogen bond filling effect of chitosan, the aerogel maintains a performance stability of more than 97% in high-temperature (150 °C) and high-humidity (70% RH) environments; supports enzymatic recovery of ZnS:Cu particles and recycling.

[0022] 3. In the present invention, bacterial cellulose is used as a substrate material, combined with ZnS:Cu luminescent particles and chitosan, to form a highly flexible, ultra-light, moisture- and heat-resistant and degradable composite aerogel through a nanofiber network structure. Description of the drawings

[0023] Figure 1 It is a schematic flow chart of the present invention. Specific embodiments

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example:

[0026] like Figure 1 As shown, an embodiment of the present invention provides a method for preparing a composite degradable TIEL aerogel, the method comprising the following steps:

[0027] S1. First, prepare the culture medium by mixing 20 g / L glucose, 5 g / L yeast extract, 5 g / L peptone, and 2.7 g / L Na 2 ·HPO 4 、0.5g / L MgSO 4 7H 2 O and 1.5 g / L citric acid were dissolved in deionized water;

[0028] S2, adjusting the pH of the culture medium with HCl to a pH value of 5.5, and then subjecting the culture medium to high-temperature sterilization at a temperature of 121° C. for 20 minutes. After cooling to room temperature, inoculating the pre-cultured Acetobacter into the culture medium, and statically culturing at 30° C. for 7 days, and then repeatedly washing the harvested membrane with deionized water, and removing impurities with an alkaline solution to obtain a fresh bacterial cellulose film;

[0029] S3, then, the obtained bacterial cellulose film is cut into small pieces, the size of the small pieces is 1 cm×1 cm, the error does not exceed 0.1 cm, and is immersed in deionized water. After swelling at room temperature for 24 hours, the bacterial cellulose film absorbs water to form a translucent gel-like structure;

[0030] S4. Then, according to the experimental needs, appropriate amounts of ZnS:Cu phosphor, chitosan, alginate and deionized water are added respectively, the mixture is fully stirred, and the water is dried at a suitable temperature. Finally, PZC, ZCC and ZCCA aerogels are obtained.

[0031] The present invention introduces chitosan as a natural electron donor to optimize the triboelectric performance of the cellulose aerogel while maintaining the degradability.

[0032] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a reference structure" does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a composite degradable TIEL aerogel, characterized in that: The method comprises the following steps: S1. First, prepare the culture medium by dissolving 20 g / L glucose, 5 g / L yeast extract, 5 g / L peptone, 2.7 g / L Na2·HPO4, 0.5 g / L MgSO4·7H2O and 1.5 g / L citric acid in deionized water; S2, adjusting the pH of the culture medium with HCl, then sterilizing the culture medium at high temperature, cooling it to room temperature, inoculating the pre-cultured Acetobacter into the culture medium, and statically culturing it at 30° C. for 7 days, then repeatedly washing the harvested membrane with deionized water, and removing impurities with an alkaline solution to obtain a fresh bacterial cellulose film; S3, then, cutting the obtained bacterial cellulose film into small pieces and soaking them in deionized water, after swelling at room temperature for 24 hours, the bacterial cellulose film absorbs water to form a translucent gel-like structure; S4. Then, according to the experimental needs, appropriate amounts of ZnS:Cu phosphor, chitosan, alginate and deionized water are added respectively, the mixture is fully stirred, and the water is dried at a suitable temperature. Finally, PZC, ZCC and ZCCA aerogels are obtained.

2. The method for preparing a composite degradable TIEL aerogel according to claim 1, characterized in that: The pH value adjusted with HCl in step 2 is 5.

5.

3. The method for preparing a composite degradable TIEL aerogel according to claim 1, characterized in that: In the step 2, the medium is sterilized by high pressure at a temperature of 121° C. and the sterilization time is 20 minutes.

4. The method for preparing a composite degradable TIEL aerogel according to claim 1, characterized in that: In step 3, the bacterial cellulose film is cut into small pieces with a size of 1 cm×1 cm and an error of no more than 0.1 cm.

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