Method for synthesizing metal silver doped carbon nanotube flexible material additive by utilizing fullerene self-assembly
The carbon nanotube material loaded with nanosilver particles was prepared through the fullerene self-assembly method, which solved the problem of insufficient flexibility of traditional wearable device materials, achieved high strength, conductivity and sterilization performance, and improved wearing comfort and safety.
Patent Information
- Application Number
- CN202510819445.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-18
- Publication Date
- 2025-09-16
AI Technical Summary
Traditional wearable device materials lack flexibility and elasticity, making it difficult to adapt to human body curves and movements, and may cause skin injuries. In addition, the materials are heavy and thick, affecting wearing comfort.
Carbon nanotube materials loaded with nanosilver particles are prepared using the fullerene self-assembly method. One-dimensional nanoaggregates are formed by self-assembly in a polar solvent, and nanosilver particles are doped into the carbon nanotubes to improve the strength and conductivity of the material. The nanotubes are then added to an epoxy resin matrix to improve flexibility and bactericidal properties.
The strength and conductivity of the material have been improved, and its flexibility and sterilization ability have been enhanced, ensuring that it is not easily injured during wearing, and improving wearing comfort and hygiene safety.
Abstract
Description
Technical Field
[0001] The invention belongs to the field of flexible materials, in particular to a carbon nanotube material loaded with nano-silver particles. Background Art
[0002] Wearable device materials are currently one of the hottest trends in scientific research. They are a type of material with properties such as flexibility, stretchability, lightness, and biocompatibility. They can conform to the curves of the human body and adapt to movement, and are widely used in smart clothing, health monitoring, electronic skin and other fields. Human skin is an uneven surface, and the rigid materials used in traditional wearable devices usually do not have sufficient flexibility and elasticity, making it difficult to adapt to the curves and movements of the human body, affecting wearing comfort. In addition, traditional rigid materials are usually relatively heavy and thick, and wearing wearable devices for a long time will greatly increase the burden on the human body. In addition, the edges and surfaces of rigid materials may have sharp corners or uncomfortable textures, and the wearer's skin may be injured due to friction and pressure. Based on this, more and more research and inventions are turning to the field of flexible wearable devices, and new flexible wearable materials are becoming the focus of this field.
[0003] Common components of wearable devices include conductors, functional fillers, and electrolytes. Modifying the materials used for fillers and conductive components is a key development direction for flexible materials. For example, flexible materials such as epoxy resin and polyester possess a certain degree of toughness and strength and can be compounded with conductive materials such as graphene, nanosilver, and polyaniline. Flexible fillers based on common epoxy resin typically have a low elastic modulus. However, compounding carbon nanotubes with epoxy resin can increase their elasticity, thereby improving their comfort when applied to human skin. Carbon nanotubes prepared from fullerenes have a one-dimensional tubular structure. As an additive to epoxy resin, they can enhance the strength and conductivity of flexible materials. Fullerenes can self-assemble into one-dimensional carbon nanotubes in organic solvents, which is a cost-effective and convenient process. Furthermore, the hollow structure of carbon nanotubes provides suitable conditions for modification, and doping with different metals can be used to tailor the properties of carbon nanotubes. Silver nanoparticles possess optical and electrical properties, enabling carbon nanotubes to absorb light and maintain electron mobility. They also possess a certain bactericidal capacity in medicine, ensuring skin hygiene during prolonged contact between devices and the human body. Therefore, silver-loaded carbon nanotubes were chosen as additives for epoxy resins used in wearable devices. Summary of the Invention
[0004] Leveraging the high carrier mobility and mechanical properties of fullerene carbon nanotubes (CNTs), which combine strength and flexibility, the epoxy resin material commonly used in wearable devices was modified. Doping with Ag nanoparticles imparted a certain degree of antibacterial and disinfecting properties to the material. The preparation of the fullerene nanotubes exploited the self-assembly mechanism of fullerenes in polar organic solutions. Fullerene was dissolved in a nonpolar solvent, followed by the addition of a polar solvent, which caused the fullerene molecules to aggregate via van der Waals forces during evaporation, forming one-dimensional nanoaggregates. Ag nanoparticles were then dispersed evenly in an ethanol solution, and a solution containing CNTs was added to produce the Ag-doped CNTs. The capillary action created by the thermal evaporation process increased the self-assembly rate of the CNTs. The Ag-doped CNTs were used as fillers in wearable devices, improving the material's strength and conductivity. After designing a suitable circuit and assembling the device, it could be used to monitor a range of health indicators, including pulse and blood pressure.
[0005] The specific steps include:
[0006] Step 1: dissolving fullerene powder in non-polar xylene, forming a molecularly dispersed solution band through magnetic stirring, and filtering to remove undissolved solid particles.
[0007] Step 2: adding ethanol to the fullerene / xylene solution and stirring to form a binary solvent system.
[0008] Step 3: dissolve the nano-Ag particles in ethanol and stir to disperse them evenly.
[0009] Step 4: Mix the solutions in step 2 and step 3, stir them evenly, and place them on a glass substrate for evaporation and self-assembly.
[0010] Step 5: evenly disperse the carbon nanotubes loaded with nano-Ag particles obtained in step 4 and add them to the substrate for modification.
[0011] Preferably, the stirring temperature in step 1 is 35°C.
[0012] Preferably, the volume ratio of xylene to ethanol in step 2 is 7:3.
[0013] Preferably, in step 4, the substrate temperature is heated to 35°C.
[0014] Compared with the prior art, the present invention has the following significant advantages:
[0015] (1) The present invention increases the diameter of carbon nanotubes through thermal evaporation, improves the strength of the material, and enhances the efficiency of self-assembly.
[0016] (2) The present invention improves the softness of wearable materials, so that the modified materials have both certain strength and elasticity, ensuring that they are not easily injured during the movement of wearable devices.
[0017] (3) The present invention utilizes polar solvents to cause fullerene self-assembly, thereby lowering the reaction temperature and reducing energy consumption.
[0018] (4) The present invention is doped with nano-Ag particles, which enhances conductivity and has a certain bactericidal effect, ensuring the cleanliness of human skin DETAILED DESCRIPTION
[0019] The present invention is further described in detail below with reference to the embodiments.
[0020] Example 1
[0021] In step 1, 10 mg of fullerene powder was added to 70 mL of xylene. The resulting mixture was mechanically stirred in a glass test tube at 2.5 Hz for 4 hours to fully disperse the fullerene powder in the xylene solvent. The uniformly dispersed mixture was filtered through a dense filter membrane with a pore size of approximately 0.22 μm to remove insoluble dust and remaining solid fullerene. The remaining filtrate was mechanically stirred in the glass test tube at 2.5 Hz for another hour.
[0022] Step 2: add 30 mL of ethanol to the filtrate obtained in step 1, and continuously mechanically stir the resulting mixture in a glass test tube at a frequency of 2.5 Hz for 1 hour.
[0023] Step 3: 5 mg of nano-Ag particles with a diameter of 25 nm were dissolved in 40 mL of ethanol, and the resulting solution was continuously mechanically stirred at a frequency of 2.5 Hz for 1 hour in a glass test tube to ensure that the nano-Ag particles were evenly dispersed without large agglomerations.
[0024] Step 4: Mix the solution obtained in step 3 with the solution obtained in step 2 and continue mechanically stirring in a glass test tube at a frequency of 2.5 Hz for 1 hour. After stirring, 100 μL of the mixed solution is dropped onto the center of a glass substrate. The substrate is heated to 35°C and evaporated for 1 hour to allow the fullerenes to self-assemble in the solvent to form carbon nanotubes loaded with Ag nanoparticles.
[0025] Step 5: Take 100 μg of the fullerene nanotube material loaded with nano-Ag particles obtained in step 4, mix it with 250 μL of isopropanol and 250 μL of ethanol, disperse it evenly, add it into the epoxy resin base material, disperse it evenly, and perform a curing treatment to obtain a modified flexible composite material.
[0026] Example 2
[0027] Step 1: Add 10 mg of fullerene powder to 50 mL of xylene and mechanically stir the resulting mixture in a glass test tube at 2.5 Hz for 4 hours to fully disperse the fullerene powder in the xylene solvent. Filter the evenly dispersed mixture through a dense filter membrane with a pore size of approximately 0.22 μm to remove insoluble dust and remaining solid fullerenes. The remaining filtrate is then mechanically stirred in the glass test tube at 2.5 Hz for 1 hour.
[0028] Step 2: add 50 mL of ethanol to the filtrate obtained in step 1, and continuously mechanically stir the resulting mixture in a glass test tube at a frequency of 2.5 Hz for 1 hour.
[0029] Step 3: 5 mg of nano-Ag particles with a diameter of 25 nm were dissolved in 50 mL of ethanol, and the resulting solution was continuously mechanically stirred at a frequency of 2.5 Hz for 1 hour in a glass test tube to ensure that the nano-Ag particles were evenly dispersed without large agglomerations.
[0030] Step 4: Mix the solution obtained in step 3 with the solution obtained in step 2 and continue mechanically stirring in a glass test tube at a frequency of 2.5 Hz for 1 hour. After stirring, 100 μL of the mixed solution is dropped onto the center of a glass substrate. The substrate is heated to 35°C and evaporated for 1 hour to allow the fullerenes to self-assemble in the solvent to form carbon nanotubes loaded with Ag nanoparticles.
[0031] Step 5: Take 100 μg of the fullerene nanotube material loaded with nano-Ag particles obtained in step 4, mix it with 250 μL of isopropanol and 250 μL of ethanol, disperse it evenly, add it into the epoxy resin base material, disperse it evenly, and perform a curing treatment to obtain a modified flexible composite material.
[0032] Example 3
[0033] Step 1: 10 mg of fullerene powder was added to 70 mL of xylene. The resulting mixture was mechanically stirred in a glass test tube at a frequency of 2.5 Hz for 4 hours to fully disperse the fullerene in the xylene solvent. The uniformly dispersed mixture was filtered through a dense filter membrane with a pore size of approximately 0.22 μm to remove insoluble dust and remaining solid fullerenes. The remaining filtrate was mechanically stirred in the glass test tube at a frequency of 2.5 Hz for 1 hour.
[0034] Step 2: add 30 mL of ethanol to the filtrate obtained in step 1, and continuously mechanically stir the resulting mixture in a glass test tube at a frequency of 2.5 Hz for 1 hour.
[0035] Step 3: 5 mg of nano-Ag particles with a diameter of 25 nm were dissolved in 40 mL of ethanol, and the resulting solution was continuously mechanically stirred at a frequency of 2.5 Hz for 1 hour in a glass test tube to ensure that the nano-Ag particles were evenly dispersed without large agglomerations.
[0036] Step 4: The solution obtained in step 3 was mixed with the solution obtained in step 2 and mechanically stirred in a glass test tube at a frequency of 2.5 Hz for 1 hour. After stirring, 100 μL of the mixed solution was dropped onto the center of a glass substrate. The substrate was heated to 35°C and evaporated for 4 hours to allow the fullerenes to self-assemble in the solvent to form carbon nanotubes loaded with Ag nanoparticles.
[0037] Step 5: Take 100 μg of the fullerene nanotube material loaded with nano-Ag particles obtained in step 4, mix it with 250 μL of isopropanol and 250 μL of ethanol, disperse it evenly, add it into the epoxy resin base material, disperse it evenly, and perform a curing treatment to obtain a modified flexible composite material.
[0038] Example 4
[0039] In step 1, 10 mg of fullerene powder was added to 70 mL of xylene. The resulting mixture was mechanically stirred in a glass test tube at 2.5 Hz for 4 hours to fully disperse the fullerene powder in the xylene solvent. The uniformly dispersed mixture was filtered through a dense filter membrane with a pore size of approximately 0.22 μm to remove insoluble dust and remaining solid fullerene. The remaining filtrate was mechanically stirred in the glass test tube at 2.5 Hz for another hour.
[0040] Step 2: add 30 mL of ethanol to the filtrate obtained in step 1, and continuously mechanically stir the resulting mixture in a glass test tube at a frequency of 2.5 Hz for 1 hour.
[0041] Step 3: 5 mg of nano-Ag particles with a diameter of 25 nm were dissolved in 40 mL of ethanol, and the resulting solution was continuously mechanically stirred at a frequency of 2.5 Hz for 1 hour in a glass test tube to ensure that the nano-Ag particles were evenly dispersed without large agglomerations.
[0042] Step 4: Mix the solution obtained in step 3 with the solution obtained in step 2 and continue mechanically stirring in a glass test tube at a frequency of 2.5 Hz for 1 hour. After stirring, 100 μL of the mixed solution is dropped onto the center of a glass substrate. The substrate is heated to 45°C and evaporated for 1 hour to allow the fullerenes to self-assemble in the solvent to form carbon nanotubes loaded with Ag nanoparticles.
[0043] Step 5: Take 100 μg of the fullerene nanotube material loaded with nano-Ag particles obtained in step 4, mix it with 250 μL of isopropanol and 250 μL of ethanol, disperse it evenly, add it into the epoxy resin base material, disperse it evenly, and perform a curing treatment to obtain a modified flexible composite material.
[0044] Comparative Example 1
[0045] This comparative example is basically the same as Example 1, except that the ratio of xylene and ethanol in the mixed solution in step 3 is 1:1, and after the nano-Ag solution is added, the ratio of xylene and ethanol is 1:3, which increases the volume proportion of the polar solvent in each reaction process.
[0046] The results showed that as the proportion of ethanol increased, the diameter of fullerene nanotubes increased, the specific surface area increased, and the number of loaded Ag nanoparticles also increased.
[0047] Comparative Example 2
[0048] This comparative example is basically the same as Example 1, except that the time for preparing fullerene carbon nanotubes by evaporation in step 6 is prolonged.
[0049] The results show that the aggregation of self-assembled fullerene carbon nanotubes is more serious when evaporating for a longer time, which is not conducive to subsequent dispersion.
[0050] Comparative Example 3
[0051] This comparative example is basically the same as Example 1, except that the temperature of the substrate during the evaporation process is increased.
[0052] The results show that higher temperatures accelerate the evaporation of the solvent and lead to more intense capillary self-assembly. Although this can increase the rate of self-assembly, it can easily destroy the structure of the carbon nanotubes and reduce the strength of the material.
Claims
1. A method for preparing fullerene carbon nanotubes containing nano-Ag particles by evaporation, characterized in that: The following steps are involved: Step 1: dissolve fullerene in a mixed solution of xylene and ethanol. Step 2: dissolving the nano-Ag particles in ethanol. Step 3: mixing fullerene and nano-Ag particles in a mixed solution of xylene and ethanol. Step 4: Prepare carbon nanotubes by self-assembly on a glass substrate using an evaporation method. Step 5: Disperse the carbon nanotubes evenly using isopropyl alcohol and Nafion solution.
2. The carbon nanotube prepared as claimed in claim 1, characterized in that The raw material used is fullerene.
3. The method of preparing carbon nanotubes by evaporation method according to claim 1, wherein: The solvents used were xylene and ethanol, the substrate was glass, and the temperature was 35°C.
4. The carbon nanotube dispersion according to claim 1, wherein The mass fraction of the nafion solution is 4%.