CN113770374B - Hollow carbon nanosphere/Al/Fe 2 O 3 Direct writing preparation method of base nano thermite - Google Patents

Hollow carbon nanosphere/Al/Fe 2 O 3 Direct writing preparation method of base nano thermite Download PDF

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CN113770374B
CN113770374B CN202111068184.1A CN202111068184A CN113770374B CN 113770374 B CN113770374 B CN 113770374B CN 202111068184 A CN202111068184 A CN 202111068184A CN 113770374 B CN113770374 B CN 113770374B
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CN113770374A (en
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竹文坤
杨光成
谯志强
杨海峰
师鹏翔
刘有松
徐传豪
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Southwest University of Science and Technology
Institute of Chemical Material of CAEP
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Abstract

The invention discloses a hollow carbon nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps: step one, mixing the hollow carbon nanospheres and Al/Fe 2 O 3 Adding a nano thermite into an organic solvent, stirring and ultrasonically treating to obtain a uniform suspension, and drying the suspension in vacuum to obtain a dry powder mixture; step two, mixing the dry powder mixture with a nitrocellulose solution, and grinding to obtain slurry; and step three, drying the slurry in vacuum after direct writing printing by using ink to obtain the thermite structure with controllable size and shape. In the invention, the hollow carbon nanospheres and Al/Fe are directly written by ink 2 O 3 The nanometer thermite solid particles are safely and controllably mixed together; the preparation of the novel thermite structure with controllable size and shape is realized by adopting the ink nozzles with different diameters. The method is safe, controllable, simple to operate and good in universality, can be used for preparing other advanced materials, and provides a new idea for future material design.

Description

Hollow carbon nanosphere/Al/Fe 2 O 3 Direct writing preparation method of base nano thermite
Technical Field
The invention belongs to the field of energetic materials, and particularly relates to a controllable and safe preparation method of hollow carbon nanospheres/Al/Fe by using an ink direct writing method 2 O 3 A direct writing method of a base nanometer thermite.
Background
As is well known, nano thermite, which consists of nano fuel (Al) and oxidant, receives increasing attention due to its higher energy density and heat release rate. Although a large number of different nanostructured thermites have been prepared in recent years, the difficulties in their design, customization and manufacture still severely limit their application in military and civilian applications. As is well known, "3D printing" techniques can use additive manufacturing techniques to create geometrically complex functional structures. Therefore, the direct writing method is introduced into the preparation process as a mature 3D printing technology to meet the preparation of the complex microstructure of the nano thermite. However, the poor heat absorption and heat transfer performance of the sample prepared by the direct writing method becomes a main factor for restricting the reaction propagation and release rate.
Here, the present invention improves Al/Fe by adding hollow carbon nanoball 2 O 3 A method for ignition and energy release rate of a nano thermite. The result shows that the hollow carbon nanosphere not only can improve the pore distribution of the thermite rod, but also has positive effects on reducing the ignition threshold, improving the heat transfer and improving the energy release rate due to the thermal decomposition and the excellent laser energy absorption capacity of the hollow carbon nanosphere. The method is simple, rapid, safe and strong in repeatability, so that the method can be widely used in the field of preparation of other advanced nano energetic materials, namely underwater thermiteLong-term storage and stable combustion provide a new concept.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the present invention, there is provided a hollow carbon nanoball/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps:
step one, hollow carbon nanospheres and Al/Fe 2 O 3 Adding a nano thermite into an organic solvent, stirring and ultrasonically treating to obtain a uniform suspension, and drying the suspension in vacuum to obtain a dry powder mixture;
step two, mixing the dry powder mixture with a nitrocellulose solution, and grinding to obtain slurry;
and step three, drying the slurry in vacuum after direct writing printing by using ink to obtain the thermite structure with controllable size and shape.
Preferably, in the first step, the hollow carbon nanospheres are mixed with Al/Fe 2 O 3 The mass ratio of the nano thermite is 1:10 to 50.
Preferably, in the first step, al/Fe 2 O 3 The mass volume ratio of the nano thermite to the organic solvent is 1.5-2.5g; the organic solvent is n-hexane.
Preferably, the concentration of the nitrocellulose solution is 10 to 20wt%; the solvent of the nitrocellulose solution is N, N-dimethyl amide; the nitrocellulose solution and Al/Fe 2 O 3 The mass ratio of the nano thermite is 1.
Preferably, the diameter of the nozzle used for the ink direct-write printing ranges from 0.2mm to 10mm.
Preferably, the method for preparing the hollow carbon nanoball comprises: adding NaN 3 And graphite fluoride are added into a high-pressure reaction kettle, and then the mixture is heated in N 2 Raising the temperature to 300-350 ℃ under the atmosphere and keeping the temperature until the pressure and the temperature generate deflagration reaction due to heat release and are naturally cooledAnd collecting the product, washing, drying in vacuum, and treating the dried product in a low-temperature plasma treatment instrument to obtain the hollow carbon nanospheres.
Preferably, the NaN is 3 And graphite fluoride in a molar mass ratio of 20-50 mmol: 1.5-2 g; the temperature of the vacuum drying is 60 ℃, and the time is 24 hours; washing was performed 3 times with distilled water.
Preferably, adding the dried product into a reaction cavity of low-temperature plasma, vacuumizing until the pressure in the cavity is stable, introducing a mixed gas of methane and argon, adjusting the gas flow until the vacuum degree in the reaction cavity is 5-10 Pa, stabilizing for 10-15 min, and performing low-temperature plasma treatment on the dried product for 4-6 min by glow discharge plasma initiated by a radio-frequency power supply to obtain hollow carbon nanospheres; wherein, the power of the radio frequency power supply is 300-800W; the volume ratio of the methane to the argon is 1-2,
preferably, in the step one, the power of the ultrasound is 35 to 45kHz, and the power is 300 to 500W.
Preferably, in the second step, a stirring type grinder is adopted for grinding, the grinding temperature is 5-10 ℃, the grinding time is 90-120 min, and the grinding speed is 1200-1500 r/min.
The invention at least comprises the following beneficial effects: in the invention, the hollow carbon nanospheres and Al/Fe are directly written by ink 2 O 3 The nanometer thermite solid particles are mixed together safely and controllably; the preparation of the novel thermite structure with controllable size and shape is realized by adopting the printing ink nozzles with different diameters. The method is safe, controllable, simple to operate and good in universality, can be used for preparing other advanced materials, and provides a new idea for future material design.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Description of the drawings:
FIG. 1 is a transmission electron microscope image of a hollow carbon nanoball prepared in example 4;
FIG. 2 is a combustion infrared image of the thermite prepared in examples 1 and 4;
FIG. 3 is a combustion image of the thermite prepared in examples 1 and 4;
FIG. 4 shows the change in the burning rate of the thermite prepared in examples 1 to 6;
FIG. 5 shows the change in the ignition threshold of the thermite prepared in examples 1 to 6;
FIG. 6 shows the change in the combustion rate of the thermite prepared in examples 2 to 4 and examples 7 to 9;
FIG. 7 shows the variation of the ignition threshold of the thermite prepared in examples 2 to 4 and examples 7 to 9;
fig. 8 is a photograph of a real object of the direct-writing apparatus of the present invention.
The specific implementation mode is as follows:
the present invention is described in further detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1:
hollow carbon nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps:
step one, 0.32gAl and 1.6g Fe 2 O 3 Adding the mixture into 50mL of normal hexane, stirring and carrying out ultrasonic treatment to obtain uniform suspension, and carrying out vacuum drying on the suspension to obtain a dry powder mixture; the power of the ultrasonic wave is 35kHz, and the power is 300W;
step two, mixing the dry powder mixture with 1.6g of nitrocellulose solution (14 wt%), and grinding to obtain slurry; grinding by using a stirring type grinder at 10 ℃ for 120min at 1200r/min;
step three, directly writing and printing the slurry by using 0.5mm nozzle ink, and then drying the slurry in vacuum to obtain the hollow carbon nanosphere/Al/Fe 2 O 3 Based on nano thermite (HCS-0).
Example 2:
hollow carbon nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps:
step one, 0.016g of hollow carbon nanosphere, 0.32g of Al and 1.6g of Fe 2 O 3 Adding the mixture into 50mL of normal hexane, stirring and carrying out ultrasonic treatment to obtain uniform suspension, and carrying out vacuum drying on the suspension to obtain a dry powder mixture; the power of the ultrasonic wave is 35kHz, and the power is 300W; the preparation method of the hollow carbon nanosphere comprises the following steps: adding 35mmol NaN 3 And 1.6g of graphite fluoride were charged into a high-pressure autoclave, and the mixture was heated under N 2 Heating to 320 ℃ in the atmosphere, keeping the temperature until the pressure and the temperature generate deflagration reaction due to heat release, naturally cooling, collecting the product, washing 3 times by using distilled water, and drying in vacuum at 60 ℃ for 24 hours to obtain the hollow carbon nanospheres;
step two, mixing the dry powder mixture with 1.6g of nitrocellulose solution (14 wt%), and grinding to obtain slurry; grinding with a stirring grinder at 10 deg.C for 120min at 1200r/min;
step three, directly writing and printing the slurry by using 0.5mm nozzle ink, and then drying the slurry in vacuum to obtain the hollow carbon nanosphere/Al/Fe 2 O 3 Based on a nano thermite (HCS-1).
Example 3:
hollow carbon nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps:
step one, 0.032g of hollow carbon nanosphere, 0.32g of Al and 1.6g of Fe 2 O 3 Adding the mixture into 50mL of normal hexane, stirring and carrying out ultrasonic treatment to obtain a uniform suspension, and carrying out vacuum drying on the suspension to obtain a dry powder mixture; the power of the ultrasonic wave is 35kHz, and the power is 300W; the preparation method of the hollow carbon nanosphere comprises the following steps: 35mmol of NaN 3 And 1.6g of graphite fluoride were charged into a high-pressure autoclave, and the mixture was heated under N 2 The temperature of the atmosphere is raised to 320 ℃ and kept at the temperature until the pressure and the temperature generate deflagration reaction due to heat release,naturally cooling, collecting the product, washing the product by distilled water for 3 times, and performing vacuum drying for 24 hours at the temperature of 60 ℃ to obtain the hollow carbon nanospheres;
step two, mixing the dry powder mixture with 1.6g of nitrocellulose solution (14 wt%), and grinding to obtain slurry; grinding with a stirring grinder at 10 deg.C for 120min at 1200r/min;
step three, directly writing and printing the slurry by using 0.5mm nozzle ink, and then drying the slurry in vacuum to obtain the hollow carbon nanosphere/Al/Fe 2 O 3 Based on nano thermite (HCS-2).
Example 4:
hollow carbon nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps:
step one, 0.064g of hollow carbon nanosphere, 0.32g of Al and 1.6g of Fe 2 O 3 Adding the mixture into 50mL of normal hexane, stirring and carrying out ultrasonic treatment to obtain uniform suspension, and carrying out vacuum drying on the suspension to obtain a dry powder mixture; the power of the ultrasonic wave is 35kHz, and the power is 300W; the preparation method of the hollow carbon nanosphere comprises the following steps: adding 35mmol NaN 3 And 1.6g of graphite fluoride were charged into a high-pressure autoclave, and the mixture was heated under N 2 Heating to 320 ℃ in the atmosphere, keeping the temperature until the pressure and the temperature generate deflagration reaction due to heat release, naturally cooling, collecting the product, washing the product for 3 times by using distilled water, and drying the product in vacuum at 60 ℃ for 24 hours to obtain the hollow carbon nanospheres;
step two, mixing the dry powder mixture with 1.6g of nitrocellulose solution (14 wt%), and grinding to obtain slurry; grinding by using a stirring type grinder at 10 ℃ for 120min at 1200r/min;
step three, directly writing and printing the slurry by using 0.5mm nozzle ink, and then drying the slurry in vacuum to obtain the hollow carbon nanosphere/Al/Fe 2 O 3 Based on nano thermite (HCS-4).
Example 5:
hollow carbon nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps:
step one, 0.096g of hollow carbon nanosphere, 0.32g of Al and 1.6g of Fe 2 O 3 Adding the mixture into 50mL of normal hexane, stirring and carrying out ultrasonic treatment to obtain uniform suspension, and carrying out vacuum drying on the suspension to obtain a dry powder mixture; the power of the ultrasonic wave is 35kHz, and the power is 300W; the preparation method of the hollow carbon nanosphere comprises the following steps: adding 35mmol NaN 3 And 1.6g of graphite fluoride were charged into a high-pressure autoclave, and the mixture was heated under N 2 Heating to 320 ℃ in the atmosphere, keeping the temperature until the pressure and the temperature generate deflagration reaction due to heat release, naturally cooling, collecting the product, washing 3 times by using distilled water, and drying in vacuum at 60 ℃ for 24 hours to obtain the hollow carbon nanospheres;
step two, mixing the dry powder mixture with 1.6g of nitrocellulose solution (14 wt%), and grinding to obtain slurry; grinding by using a stirring type grinder at 10 ℃ for 120min at 1200r/min;
step three, directly writing and printing the slurry by using 0.5mm nozzle ink, and then drying the slurry in vacuum to obtain the hollow carbon nanosphere/Al/Fe 2 O 3 Based on nano thermite (HCS-6).
Example 6:
hollow carbon nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps:
step one, 0.16g of hollow carbon nanosphere, 0.32g of Al and 1.6g of Fe 2 O 3 Adding the mixture into 50mL of normal hexane, stirring and carrying out ultrasonic treatment to obtain uniform suspension, and carrying out vacuum drying on the suspension to obtain a dry powder mixture; the power of the ultrasonic wave is 35kHz, and the power is 300W; the preparation method of the hollow carbon nanosphere comprises the following steps: adding 35mmol NaN 3 And 1.6g of graphite fluoride were charged into a high-pressure autoclave, and the mixture was heated under N 2 Heating to 320 ℃ in the atmosphere, keeping the temperature until the pressure and the temperature generate deflagration reaction due to heat release, naturally cooling, collecting the product, washing the product for 3 times by using distilled water, and drying the product in vacuum at 60 ℃ for 24 hours to obtain the hollow carbon nanospheres;
step two, mixing the dry powder mixture with 1.6g of nitrocellulose solution (14 wt%), and grinding to obtain slurry; grinding by using a stirring type grinder at 10 ℃ for 120min at 1200r/min;
step three, directly writing and printing the slurry by using 0.5mm nozzle ink, and then drying the slurry in vacuum to obtain the hollow carbon nanosphere/Al/Fe 2 O 3 Based on a nano thermite (HCS-10).
Example 7:
hollow carbon nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps:
step one, 0.016g of hollow carbon nanosphere, 0.32g of Al and 1.6g of Fe 2 O 3 Adding the mixture into 50mL of normal hexane, stirring and carrying out ultrasonic treatment to obtain a uniform suspension, and carrying out vacuum drying on the suspension to obtain a dry powder mixture; the power of the ultrasonic wave is 35kHz, and the power is 300W; the preparation method of the hollow carbon nanosphere comprises the following steps: 35mmol of NaN 3 And 1.6g of graphite fluoride were charged into a high-pressure autoclave, and the mixture was heated under N 2 Heating to 320 ℃ in the atmosphere, keeping the temperature until the pressure and the temperature generate deflagration reaction due to heat release, naturally cooling, collecting a product, washing for 3 times by using distilled water, performing vacuum drying for 24 hours at 60 ℃, adding the dried product into a reaction cavity of low-temperature plasma, vacuumizing until the pressure in the cavity is stable, introducing mixed gas of methane and argon, adjusting the gas flow until the vacuum degree in the reaction cavity is 8Pa, stabilizing for 10min, and performing low-temperature plasma treatment on the dried product for 5min by using glow discharge plasma initiated by a radio frequency power supply to obtain hollow carbon nanospheres; wherein the power of the radio frequency power supply is 800W; the volume ratio of the methane to the argon is 1;
step two, mixing the dry powder mixture with 1.6g of nitrocellulose solution (14 wt%), and grinding to obtain slurry; grinding by using a stirring type grinder at 10 ℃ for 120min at 1200r/min;
step three, directly writing and printing the slurry by using 0.5mm nozzle ink, and then drying the slurry in vacuum to obtain the hollow carbon nanosphere/Al/Fe 2 O 3 Based on nano thermite (1-HCS-1).
Example 8:
hollow carbon nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps:
step one, 0.032g of hollow carbon nanosphere, 0.32g of Al and 1.6g of Fe 2 O 3 Adding the mixture into 50mL of normal hexane, stirring and carrying out ultrasonic treatment to obtain uniform suspension, and carrying out vacuum drying on the suspension to obtain a dry powder mixture; the power of the ultrasonic wave is 35kHz, and the power is 300W; the preparation method of the hollow carbon nanosphere comprises the following steps: 35mmol of NaN 3 And 1.6g of graphite fluoride were charged into a high-pressure autoclave, and the mixture was heated under N 2 Heating to 320 ℃ in the atmosphere, keeping the temperature until the pressure and the temperature generate deflagration reaction due to heat release, naturally cooling, collecting a product, washing for 3 times by using distilled water, performing vacuum drying for 24 hours at 60 ℃, adding the dried product into a reaction cavity of low-temperature plasma, vacuumizing until the pressure in the cavity is stable, introducing mixed gas of methane and argon, adjusting the gas flow until the vacuum degree in the reaction cavity is 10Pa, stabilizing for 12min, and performing low-temperature plasma treatment on the dried product for 4min by using glow discharge plasma initiated by a radio frequency power supply to obtain hollow carbon nanospheres; wherein the power of the radio frequency power supply is 800W; the volume ratio of the methane to the argon is 1;
step two, mixing the dry powder mixture with 1.6g of nitrocellulose solution (14 wt%), and grinding to obtain slurry; grinding by using a stirring type grinder at 10 ℃ for 120min at 1200r/min;
step three, directly writing and printing the slurry by using 0.5mm nozzle ink, and then drying the slurry in vacuum to obtain the hollow carbon nanosphere/Al/Fe 2 O 3 Based on a nano thermite (1-HCS-2).
Example 9:
hollow carbon nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nanometer thermite comprises the following steps:
step one, 0.064g of hollow carbon nanosphere, 0.32g of Al and 1.6g of Fe 2 O 3 Adding into 50mL of normal hexane, stirring and carrying out ultrasonic treatment to obtainDrying the uniform suspension in vacuum to obtain a dry powder mixture; the power of the ultrasonic wave is 35kHz, and the power is 300W; the preparation method of the hollow carbon nanosphere comprises the following steps: adding 35mmol NaN 3 And 1.6g of graphite fluoride were charged into a high-pressure autoclave, and the mixture was heated under N 2 Heating to 320 ℃ in the atmosphere, keeping the temperature until the pressure and the temperature generate deflagration reaction due to heat release, naturally cooling, collecting a product, washing for 3 times by using distilled water, performing vacuum drying for 24 hours at 60 ℃, adding the dried product into a reaction cavity of low-temperature plasma, vacuumizing until the pressure in the cavity is stable, introducing mixed gas of methane and argon, adjusting the gas flow until the vacuum degree in the reaction cavity is 10Pa, stabilizing for 15min, and performing low-temperature plasma treatment on the dried product for 5min by using glow discharge plasma initiated by a radio frequency power supply to obtain the hollow carbon nanospheres; wherein the power of the radio frequency power supply is 800W; the volume ratio of the methane to the argon is 1;
step two, mixing the dry powder mixture with 1.6g of nitrocellulose solution (14 wt%), and grinding to obtain slurry; grinding by using a stirring type grinder at 10 ℃ for 120min at 1200r/min;
step three, directly writing and printing the slurry by using 0.5mm nozzle ink, and then drying the slurry in vacuum to obtain the hollow carbon nanosphere/Al/Fe 2 O 3 Based on nano thermite (1-HCS-4).
FIG. 2 is a combustion infrared image of the thermite prepared in examples 1 and 4; as shown in fig. 2, the energy absorption of HCS-4 with a darker color is significantly enhanced and the infrared photograph shows a faster temperature rise, which is benefited by the presence of the hollow carbon nanoball having a good energy absorption capacity, which may result in a decreased ignition response time.
FIG. 3 is a combustion image of the thermite prepared in examples 1 and 4; as shown in FIG. 3, a snapshot of HCS-4 shows a more glaring flame intensity and a larger flame area than HCS-0, with a large number of hot particles ejected from the sample surface. The ignition response time of HCS-4 is reduced from 75ms to 60ms compared to HCS-0, and the formation process of stable flame propagation is reduced by 36% compared to HCS-0. The angle between the flame spray direction and the horizontal direction is also reduced, which shows that the burning rate of the HCS-4 with low density is high, and the HCS-4 is easier to ignite and propagate.
FIG. 4 shows the change in the combustion rate of the thermite prepared in examples 1 to 6. The results show that the addition of a small amount of H-CS can enhance the heat transfer in the self-propagating combustion, while the addition of an excessive amount of H-CS can significantly deteriorate the combustion process because it hinders the oxidation of Al and accelerates the dissipation process of heat energy; FIG. 5 shows the change in the ignition threshold of the thermite prepared in examples 1 to 6. The results show that HCS-4 requires minimal ignition energy; fig. 6 shows the change in the burning rate of the thermite prepared in examples 2 to 4 and examples 7 to 9, and the results show that the burning rate is remarkably improved by adding the low-temperature plasma-treated hollow carbon nanoball; fig. 7 shows the change of the ignition threshold of the thermite prepared in examples 2 to 4 and examples 7 to 9, and the results show that the ignition energy can be reduced by adding the low temperature plasma treated hollow carbon nanoball.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (9)

1. Hollow carbon nanosphere/Al/Fe 2 O 3 The direct-writing preparation method of the base nanometer thermite is characterized by comprising the following steps:
step one, hollow carbon nanospheres and Al/Fe 2 O 3 Adding a nano thermite into an organic solvent, stirring and ultrasonically treating to obtain a uniform suspension, and drying the suspension in vacuum to obtain a dry powder mixture;
step two, mixing the dry powder mixture with a nitrocellulose solution, and grinding to obtain slurry;
step three, drying the slurry in vacuum after direct-writing printing by using ink to obtain a thermite structure with controllable size and shape;
the preparation method of the hollow carbon nanosphere comprises the following steps: adding NaN 3 And graphite fluoride are added into a high-pressure reaction kettle, and then the mixture is heated in N 2 And heating to 300-350 ℃ under the atmosphere, keeping the temperature until the pressure and the temperature generate deflagration reaction due to heat release, naturally cooling, collecting the product, washing, drying in vacuum, and placing the dried product in a low-temperature plasma processor for processing to obtain the hollow carbon nanospheres.
2. The hollow carbon nanoball/Al/Fe according to claim 1 2 O 3 The direct writing preparation method of the base nanometer thermite is characterized in that in the step one, the hollow carbon nanospheres and Al/Fe 2 O 3 The mass ratio of the nano thermite is 1:10 to 50.
3. The hollow carbon nanoball/Al/Fe of claim 1 2 O 3 The direct writing preparation method of the base nanometer thermit is characterized in that in the step one, al/Fe 2 O 3 The mass volume ratio of the nano thermite to the organic solvent is 1.5 to 2.5g; the organic solvent is n-hexane.
4. The hollow carbon nanoball/Al/Fe according to claim 1 2 O 3 The direct writing preparation method of the base nanometer thermite is characterized in that the concentration of the nitrocellulose solution is 10 to 20wt%; the solvent of the nitrocellulose solution is N, N-dimethyl amide; the nitrocellulose solution and Al/Fe 2 O 3 The mass ratio of the nano thermite is 1 to 2.
5. The hollow carbon nanoball/Al/Fe according to claim 1 2 O 3 The direct-writing preparation method of the nano thermite is characterized in that the diameter range of a nozzle adopted by the ink direct-writing printing is 0.2mm-10mm.
6. The hollow carbon according to claim 1nanosphere/Al/Fe 2 O 3 The direct writing preparation method of the base nano thermite is characterized in that the NaN is 3 And the molar mass ratio of graphite fluoride to graphite fluoride is 20 to 50mmol:1.5 to 2g; the temperature of the vacuum drying is 60 ℃, and the time is 24 hours; washing was performed 3 times with distilled water.
7. The hollow carbon nanoball/Al/Fe of claim 1 2 O 3 The direct-writing preparation method of the base nanometer thermite is characterized in that a dried product is added into a reaction cavity of low-temperature plasma, the reaction cavity is vacuumized until the pressure in the cavity is stable, mixed gas of methane and argon is introduced, the gas flow is adjusted until the vacuum degree in the reaction cavity is 5-10Pa and the reaction cavity is stable for 10-15min, and low-temperature plasma treatment is carried out on the dried product for 4-6 min by glow discharge plasma initiated by a radio frequency power supply to obtain hollow carbon nanospheres; wherein the power of the radio frequency power supply is 300 to 800W; the volume ratio of the methane to the argon is 1 to 2, and the ratio is as follows.
8. The hollow carbon nanoball/Al/Fe according to claim 1 2 O 3 The direct writing preparation method of the base nanometer thermit is characterized in that in the first step, the frequency of ultrasound is 35 to 45kHz, and the power is 300 to 500W.
9. The hollow carbon nanoball/Al/Fe according to claim 1 2 O 3 The direct writing preparation method of the base nanometer thermite is characterized in that in the second step, a stirring type grinding machine is adopted for grinding, the grinding temperature is 5-10 ℃, the grinding time is 90-120min, and the grinding speed is 1200-1500 r/min.
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