Three-dimensional ordered porous graphene wave-absorbing material and preparation method thereof
A porous graphene, three-dimensional ordered technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of ignoring the reflection, scattering and interference of the internal pore structure of three-dimensional graphene, and the size of the three-dimensional graphene pore size is not easy to control. , poor mechanical properties of disordered graphene, etc., to achieve the effects of efficient absorption, low cost, and adjustable pore structure
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0029] Measure graphene oxide aqueous solution (5 mg / mL, 2mL) and sodium alginate aqueous solution (10 mg / mL, 1mL), after magnetic stirring, ultrasonic dispersion in cold water to obtain a mixed solution; transfer the mixed solution to a mold containing polymer On the directional freezing device, the graphene oxide ice cubes were obtained by cooling the temperature at a rate of 2°C / min through the programmed temperature control system; the graphene oxide ice cubes were dried in the freeze drying equipment for 24 hours, and the vacuum degree was 4Pa to obtain three-dimensional Ordered porous graphene oxide: three-dimensional ordered porous graphene oxide was raised to a temperature of 600 °C for 3 h at a rate of 1 °C / min in an inert atmosphere, and then cooled naturally to obtain three-dimensional ordered porous graphene. The prepared three-dimensional ordered porous graphene has a density of 4.5 mg / cm 3 , The porosity is 99%.
[0030] figure 1 The axial and radial scanning e...
Embodiment 2
[0033] Measure graphene oxide aqueous solution (10 mg / mL, 2mL) and cellulose aqueous solution (20 mg / mL, 2mL), stir magnetically, and disperse ultrasonically in cold water to obtain a mixed solution; transfer the mixed solution to a container containing a polymer mold. On the directional freezing device, the graphene oxide ice cubes were obtained by cooling the temperature at a rate of 8 °C / min through the program temperature control system; the graphene oxide ice cubes were put into the freeze drying equipment for 48 hours and dried at a vacuum of 5 Pa to obtain three-dimensional organic Ordered porous graphene oxide; the three-dimensional ordered porous graphene oxide was raised to a temperature of 800 °C for 2 hours at a rate of 3 °C / min in an inert atmosphere, and then cooled naturally to obtain a three-dimensional ordered porous graphene. The prepared three-dimensional ordered porous graphene has a density of 8.7 mg / cm 3 , The porosity is 98%.
[0034] figure 2 The axi...
Embodiment 3
[0037] Measure graphene oxide aqueous solution (20 mg / mL, 2 mL) and polyvinyl alcohol / sucrose mixed aqueous solution (10 mg / mL, 0.4 mL), wherein the mass ratio of polyvinyl alcohol and sucrose is 1:1, and after magnetic stirring, put in cold water Ultrasonic dispersion to obtain a mixed solution; transfer the mixed solution to a directional freezing device containing a polymer mold, and cool down at a rate of 15°C / min through a programmed temperature control system to obtain graphene oxide ice cubes; put the graphene oxide ice cubes Dry in a freeze-drying equipment for 72 h, and the vacuum degree is 8 Pa to obtain a three-dimensional ordered porous graphene oxide; the three-dimensional ordered porous graphene oxide is raised to a temperature of 1000 °C at a heating rate of 5 °C / min in an inert atmosphere Insulated for 1 h, and then cooled naturally to obtain three-dimensional ordered porous graphene. The prepared three-dimensional ordered porous graphene has a density of 15.5 ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| Density | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More