CN113652009A - Preparation method and application of nitrated chitosan/GO/n-Ti composite material - Google Patents
Preparation method and application of nitrated chitosan/GO/n-Ti composite material Download PDFInfo
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- C08K2003/0881—Titanium
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Abstract
The invention relates to a preparation method of a high-energy nano composite material, which comprises the steps of firstly dropwise adding a suspension of nano titanium powder into a nitrified chitosan solution, uniformly mixing through acoustic resonance, then dropwise adding a graphene oxide suspension, and finally uniformly mixing through acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain the high-energy nano composite material. The high-energy nano composite material nitrated chitosan/GO/n-Ti prepared by the invention has the advantages of uniform dispersion, sufficient combustion and huge energy release, and can be used as a combustion additive of a combustion agent or a solid propellant to realize the rapid steady-state combustion of the solid propellant. The synthetic method is simple, efficient and easy for industrial production.
Description
Technical Field
The invention belongs to the technical field of nano energetic materials, and particularly relates to a preparation method and application of a nitrated chitosan/GO/n-Ti composite material.
Background
The nano titanium powder (n-Ti) has higher volume heat value (89.42kJ cm)-3) And excellent ignition performance, so that the fuel additive can be used as a fuel additive of an energetic material to improve the combustion performance and the explosion power, and has important application prospect in the aspect of solid propellant. However, the nano titanium powder has extremely high activity and is easy to oxidize and agglomerate, so that the problems of active ingredient reduction, energy density reduction, ignition temperature rise, insufficient combustion, low energy release efficiency and the like are caused. In order to solve this problem, researchers in related fields at home and abroad have conducted extensive research thereon. At present, one of the most practical and effective methods is to carry out surface coating modification on n-Ti particles, which not only can effectively solve the problems of oxidation and agglomeration, but also can obviously improve the combustion efficiency and improve the combustion performance (1)]Zong Y C,Jacob R J,Li S Q,et al.Size resolved high temperature oxidation kinetics of nano-sized titanium and zirconium particles[J].The Journal of Physical Chemistry A,2015,119(24):6171-6178.[2]Study on catalytic decomposition kinetics of solid-phase HMX by two kinds of nano metal powders in Liuwenliang, Guyan, Dorsong and Zhangjun [ J]The bulletin of explosives and powders 2020,43(04):413 and 418 [3 ]]Preparation of nanometer Ti/PAM composite particle]Functional material 2015,46(11): 11148-.
However, the performance of the existing method for coating the n-Ti particles is to be improved, so that a new coating strategy is needed to improve the dispersion performance and the combustion performance of the n-Ti particles.
Disclosure of Invention
The invention aims to provide a preparation method of a nitrated chitosan/GO/n-Ti composite material.
The invention also aims to provide the application of the nitrated chitosan/GO/n-Ti composite material prepared by the method as a high-energy combustion agent or a solid propellant combustion additive.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the preparation method of the nitrated chitosan/GO/n-Ti composite material comprises the steps of firstly, dropwise adding a suspension of nano titanium powder into a nitrated chitosan solution, uniformly mixing through acoustic resonance, then dropwise adding a graphene oxide suspension, and finally, uniformly mixing through acoustic resonance, carrying out centrifugal filtration and vacuum freeze drying to obtain the nitrated chitosan/GO/n-Ti composite material.
The further improvement of the invention is that the nano titanium powder suspension is prepared by adding nano titanium powder into acetone or ethanol;
the further improvement of the invention is that the nitrated chitosan solution is prepared by adding nitrated chitosan into acetone;
in a further improvement of the invention, the graphene oxide suspension is prepared by adding graphene oxide to ethanol or isopropanol.
The further improvement of the invention is that the grain diameter of the nano titanium powder is 50 nm-200 nm.
The invention has the further improvement that the mass ratio of the nano titanium powder to the nitrated chitosan is 5: 1-9: 1.
The invention is further improved in that the substitution degree of the nitrated chitosan is 1.8-2.1.
The further improvement of the invention is that the mass of the graphene oxide is 0.5-2% of the total mass of the nano titanium powder and the nitrated chitosan.
The application of the nitrated chitosan/GO/n-Ti composite material prepared by the method as a combustion agent or a combustion additive.
Compared with the prior art, the invention has the following beneficial effects:
in the composite material prepared by the invention, the surface of the nano titanium powder is coated with the nitrated chitosan, and the nano titanium powder (n-Ti) coated with the nitrated chitosan is uniformly loaded on the surface of the graphene oxide; the nitrated chitosan is coated on the surface of the nano titanium powder, so that the self-agglomeration phenomenon of the n-Ti powder is effectively relieved, the dispersity is enhanced, an oxygen-rich environment required by redox reaction is provided, continuous violent combustion reaction can be generated, and huge energy is released. Meanwhile, the energetic polymer oxide nitrated chitosan coating effectively inhibits the oxidation of high-activity n-Ti, improves the active ingredients of the high-activity n-Ti, enables the combustion to be more sufficient, and obviously improves the energy release efficiency. Therefore, the high-energy nano composite material nitrated chitosan/GO/n-Ti prepared by the invention simultaneously has an energy-containing oxidant (nitrated chitosan with high substitution degree) and a high-activity nano metal fuel (n-Ti). According to the invention, Graphene Oxide (GO) is introduced, and is dispersed to form a thin film layer, so that the graphene oxide thin film layer has good ductility and a large surface area, and nanometer titanium powder (n-Ti) shell-core particles coated by nitrated chitosan are uniformly loaded on the surface of graphene oxide through a physical adsorption effect, so that agglomeration is reduced, the graphene oxide thin film layer is uniformly dispersed, and sustainable linear steady-state combustion of the n-Ti powder can be realized. The safety performance of the composite energetic material is further improved by the graphene oxide. The preparation method is simple, efficient and practical, and can realize industrial production.
The nitrated chitosan/GO/n-Ti ternary nano energetic composite material prepared by the method can be used as a combustion agent and a combustion additive of a solid propellant, so that the rapid steady-state combustion of the solid propellant is realized, and the pressure index is reduced.
Drawings
FIG. 1 is an SEM image of the nitrated chitosan/GO/n-Ti and nitrated chitosan/n-Ti prepared in examples 1-3 and comparative examples 1-3; wherein (a) is an SEM picture of nitrated chitosan/n-Ti ═ 1: 5; (b) SEM picture of nitrated chitosan/n-Ti ═ 1: 7; (c) SEM picture of nitrated chitosan/n-Ti ═ 1: 9; (d) SEM image of nitrated chitosan/GO/n-Ti (GO, 0.5% wt); (e) SEM image of nitrated chitosan/GO/n-Ti (GO, 1.0% wt); (f) SEM image of nitrated chitosan/GO/n-Ti (GO, 1.5% wt);
FIG. 2 is an XRD plot of nitrated chitosan/GO/n-Ti of example 1;
FIG. 3 is a graph of ignition delay time versus power density for the nitrated chitosan/GO/n-Ti, nitrated chitosan/n-Ti, n-Ti of example 1;
FIG. 4 is a graph of laser ignition delay time and flame propagation velocity for comparative examples 1-3 nitrated chitosan/n-Ti;
FIG. 5 is a graph of laser ignition delay time and flame propagation velocity for the nitrated chitosans/GO/n-Ti of examples 1-3;
FIG. 6 is a laser ignition high speed photographic flame diagram of examples 1-3 and comparative examples 1-3 and n-Ti.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The preparation method of the high-energy nano composite material nitrated chitosan/graphene oxide/nano titanium powder comprises the following steps: firstly, dropwise adding a suspension of nano titanium powder (n-Ti) into a nitrified chitosan solution, uniformly mixing through acoustic resonance, then dropwise adding a Graphene Oxide (GO) suspension, uniformly mixing through acoustic resonance, carrying out centrifugal filtration, and carrying out vacuum freeze drying to obtain brown powder, namely the high-energy nano composite material nitrified chitosan/GO/n-Ti.
The nano titanium powder suspension is prepared by adding nano titanium powder into acetone or ethanol;
the nitrated chitosan solution is prepared by adding nitrated chitosan into acetone;
the Graphene Oxide (GO) suspension is prepared by adding graphene oxide into ethanol or isopropanol.
The particle size of the graphene oxide is as follows: 50 nm-200 nm.
The mass ratio of the nano titanium powder to the nitrated chitosan is as follows: 5: 1-9: 1.
The substitution degree of the high-substitution-degree nitrated chitosan is 1.8-2.1.
The mass of the graphene oxide is 0.5-2% of the total mass of the nano titanium powder and the nitrated chitosan.
The nitrated chitosan/GO/n-Ti composite material prepared by the method is applied as a combustion agent or a combustion additive.
Example 1
Ultrasonically dispersing 0.7g of n-Ti powder (100 nm-150 nm) in 15mL of acetone solution to obtain n-Ti acetone suspension; stirring and dissolving 0.1g of nitrated chitosan in 15mL of acetone solution to obtain a nitrated chitosan acetone solution; ultrasonically dispersing 4.0mg of GO in 15mL of ethanol solution to obtain an ethanol suspension of Graphene Oxide (GO).
And then dropwise adding the n-Ti acetone suspension into the nitrified chitosan acetone solution, uniformly mixing by acoustic resonance, then dropwise adding the Graphene Oxide (GO) ethanol suspension, uniformly mixing by acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain brown powder, namely the high-energy nano composite material nitrified chitosan/GO/n-Ti.
FIG. 1 (d) is an SEM picture of the nitrated chitosan/GO/n-Ti prepared in the example, and the result shows that: the n-Ti shell-core particles coated by the nitrated chitosan are uniformly loaded on the surface of the GO film, so that the dispersibility of the GO film is further improved. The ignition delay time and flame propagation speed of the sample were 11.0ms and 1.15m s respectively-1。
Example 2
Ultrasonically dispersing 0.7g of n-Ti in 15mL of acetone solution to obtain n-Ti acetone suspension; stirring and dissolving 0.1g of nitrated chitosan in 15mL of acetone solution to obtain a nitrated chitosan acetone solution; ultrasonically dispersing 8.0mg of GO in 15mL of ethanol solution to obtain an ethanol suspension of Graphene Oxide (GO).
And then dropwise adding the n-Ti acetone suspension into the nitrified chitosan acetone solution, uniformly mixing by acoustic resonance, then dropwise adding the Graphene Oxide (GO) ethanol suspension, uniformly mixing by acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain brown powder, namely the high-energy nano composite material nitrified chitosan/GO/n-Ti.
FIG. 1 (e) is an SEM picture of the nitrated chitosan/GO/n-Ti prepared in the example, and the result shows that: the n-Ti core-shell particles coated by the nitrated chitosan are successfully loaded on the surface of the GO film, so that the dispersion performance of the GO film is enhanced. The ignition delay time and flame propagation speed of the sample were 9.0ms and 2.23m s respectively-1。
FIG. 2 is an XRD pattern of the nitrated chitosan/GO/n-Ti prepared in this example, and the results show that: the diffraction peak of the XRD curve of the nitrated chitosan/GO/n-Ti is consistent with the standard card of Ti (JCPDS No. 44-1294), the diffraction peak at 2 theta (10.72 degrees) corresponds to the characteristic peak of GO, and the diffraction peak at 2 theta (22.04 degrees) corresponds to the characteristic peak of the nitrated chitosan, which indicates that the nitrated chitosan, GO and nano Ti have been successfully compounded.
Example 3
Ultrasonically dispersing 0.7g of n-Ti in 15mL of acetone solution to obtain n-Ti acetone suspension; stirring and dissolving 0.1g of nitrated chitosan in 15mL of acetone solution to obtain a nitrated chitosan acetone solution; ultrasonically dispersing 12.0mg of GO in 15mL of ethanol solution to obtain an ethanol suspension of Graphene Oxide (GO).
And then dropwise adding the n-Ti acetone suspension into the nitrified chitosan acetone solution, uniformly mixing by acoustic resonance, then dropwise adding the Graphene Oxide (GO) ethanol suspension, uniformly mixing by acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain brown powder, namely the high-energy nano composite material nitrified chitosan/GO/n-Ti.
In FIG. 1, (f) is an SEM picture of the nitrated chitosan/GO/n-Ti prepared in the example, and the result shows that: the n-Ti core-shell particles coated by the nitrated chitosan are relatively uniformly loaded on the surface of GO, and the dispersion performance of the N-Ti core-shell particles is further improved. The ignition delay time and flame propagation speed of the sample were 7.0ms and 3.73m s respectively-1。
FIG. 3 is a graph of the relationship between ignition delay time and laser power density for the nitrated chitosan/GO/n-Ti prepared in this example, showing that: the ignition delay time of the nitrated chitosan/GO/n-Ti is gradually reduced along with the increase of the laser power density. And is between 40 and 73W cm-2In the laser power density range, the ignition delay time of the nitrated chitosan/GO/n-Ti is shorter than that of pure n-Ti, and the ignition performance of the n-Ti is obviously improved.
FIG. 5 shows that the nitrated chitosan/GO/n-Ti composite material prepared in examples 1-3 is 82.0W cm-2Ignition delay time and flame propagation velocity plot at laser power density. The results show that: with increasing GO content, the ignition delay time was gradually shortened (11, 9, 7ms) and the flame propagation speed was gradually increased (1.15, 2.23, 3.73m s)-1) The minimum ignition delay time and the maximum flame propagation speed are respectively 7.0ms and 3.73m s when the GO content is 1.5 percent-1。
Example 4
Ultrasonically dispersing 0.5g of n-Ti (50 nm-100 nm) in 15mL of acetone solution to obtain n-Ti acetone suspension; stirring and dissolving 0.1g of nitrated chitosan in 15mL of acetone solution to obtain a nitrated chitosan acetone solution; ultrasonically dispersing 12.0mg of GO in 15mL of ethanol solution to obtain an ethanol suspension of Graphene Oxide (GO).
And then dropwise adding the n-Ti acetone suspension into the nitrified chitosan acetone solution, uniformly mixing by acoustic resonance, then dropwise adding the Graphene Oxide (GO) ethanol suspension, uniformly mixing by acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain brown powder, namely the high-energy nano composite material nitrified chitosan/GO/n-Ti.
Example 5
Ultrasonically dispersing 0.9g of n-Ti (150 nm-200 nm) in 15mL of acetone solution to obtain n-Ti acetone suspension; stirring and dissolving 0.1g of nitrated chitosan in 15mL of acetone solution to obtain a nitrated chitosan acetone solution; ultrasonically dispersing 20.0mg of GO in 15mL of ethanol solution to obtain an ethanol suspension of Graphene Oxide (GO).
And then dropwise adding the n-Ti acetone suspension into the nitrified chitosan acetone solution, uniformly mixing by acoustic resonance, then dropwise adding the Graphene Oxide (GO) ethanol suspension, uniformly mixing by acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain brown powder, namely the composite material nitrified chitosan/GO/n-Ti.
Example 6
Ultrasonically dispersing 0.6g of n-Ti (100 nm-150 nm) in 15mL of acetone solution to obtain n-Ti acetone suspension; stirring and dissolving 0.1g of nitrated chitosan in 15mL of acetone solution to obtain a nitrated chitosan acetone solution; ultrasonically dispersing 12.0mg of GO in 15mL of ethanol solution to obtain an ethanol suspension of Graphene Oxide (GO).
And then dropwise adding the n-Ti acetone suspension into the nitrified chitosan acetone solution, uniformly mixing by acoustic resonance, then dropwise adding the Graphene Oxide (GO) ethanol suspension, uniformly mixing by acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain brown powder, namely the high-energy nano composite material nitrified chitosan/GO/n-Ti.
Comparative example 1
0.5g of n-Ti was ultrasonically dispersed in 15mL of an ethanol solution, and 0.1g of nitrated chitosan was dissolved in 15mL of an acetone solution with stirring.
Then dripping the n-Ti ethanol suspension into the nitrated chitosan acetone solution, uniformly mixing by acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain brown powder, namely the binary high-energy nano composite nitrated chitosan/n-Ti (1: 5).
In FIG. 1, (a) is a nitrated chitosan/n-TiSEM picture obtained by the comparative example, and the result shows that: the nitrated chitosan and the n-Ti are compounded to form a nitrated chitosan/n-Ti binary composite material with a uniform structure, and the dispersion performance of the nitrated chitosan/n-Ti binary composite material is obviously improved. The ignition delay time and flame propagation speed of the sample were 8.0ms and 48.5m s respectively-1。
Comparative example 2
0.7g of n-Ti was ultrasonically dispersed in 20mL of an ethanol solution, and 0.1g of nitrated chitosan was dissolved in 15mL of an acetone solution with stirring.
Then dripping the n-Ti ethanol suspension into the nitrated chitosan acetone solution, uniformly mixing by acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain brown powder, namely the binary high-energy nano composite nitrated chitosan/n-Ti (1: 7).
FIG. 1 (b) is an SEM picture of the nitrated chitosan/n-Ti prepared in the comparative example, and the result shows that: the nitrated chitosan and the n-Ti are successfully compounded to form the nitrated chitosan/n-Ti binary composite material with uniform appearance, and the dispersibility of the n-Ti powder is improved. The ignition delay time and flame propagation speed of the sample were 5.0ms and 65.5m s respectively-1。
Comparative example 3
0.9g of n-Ti was ultrasonically dispersed in 20mL of an ethanol solution, and 0.1g of nitrated chitosan was dissolved in 15mL of an acetone solution with stirring.
Then dripping the n-Ti ethanol suspension into the nitrated chitosan acetone solution, uniformly mixing by acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain brown powder, namely the binary high-energy nano composite nitrated chitosan/n-Ti (1: 9).
FIG. 1 (c) is a nitrated chitosan/n-TiSEM picture obtained by the comparative example, and the result shows that: nitrating shellThe chitosan and the n-Ti are uniformly compounded to form the nitrated chitosan/n-Ti binary composite material with uniform structure, and the dispersibility of the n-Ti is still good. The ignition delay time and flame propagation speed of the sample were 3.0ms and 20.9m s respectively-1。
FIG. 4 shows the density of the nitrated chitosan/n-Ti composite material prepared in comparative examples 1-3 at 82.0W cm-2Ignition delay time and flame propagation velocity plot at laser power density. The results show that: with the reduction of the content of the nitrated chitosan, the ignition delay time is gradually reduced (15, 8, 5, 3ms), and the flame propagation speed shows a tendency of increasing and then reducing (11.5, 48.5, 65.5, 20.9m s)-1) The maximum flame propagation rate of 65.5m s when nitrated chitosan/n-Ti is 1:7-1。
FIG. 6 is a laser ignition high speed photographic flame diagram of the nitrated chitosan/GO/n-Ti, nitrated chitosan/n-Ti and n-Ti prepared in examples 1-3 and comparative examples 1-3. The results show that: pure nano titanium powder in air atmosphere, CO2Pulsed laser (Power Density: 82.0W cm)-2(ii) a Pulse energy: 54 mJ; pulse width: 40 mus) of the molten glass, the molten glass shines to be gradually extinguished, and no flame is generated all the way. When the nitrated chitosan is added, the deflagration phenomenon occurs quickly, and a violent and dazzling flame is formed. This shows that the introduction of the nitrated chitosan obviously improves the combustion performance of the nano n-Ti and realizes the full and thorough combustion of the nano n-Ti. With the increase of the content of the nitrated chitosan, the time for reaching the maximum flame is firstly reduced and then increased (3.5, 2.0 and 5.5ms), and the combustion time is firstly reduced and then increased (47.0, 27.0 and 45.5ms), which shows that the maximum combustion rate is realized when the nitrated chitosan/n-Ti is 1:7, the combustion performance is optimal, and the energy release efficiency is highest. After GO is introduced, flame propagates obviously linearly, the flame propagation speed is gradually increased along with the increase of the GO content, the combustion time length is sequentially reduced (356.0, 343.0 and 335.0ms), and the combustion rate is gradually increased along with the increase of the GO content.
The high-substitution-degree nitrated chitosan has a unique honeycomb network structure, has higher nitrogen content (16.67%) than Nitrocotton (NC), and combustion heat (-7831.6 +/-116.3J g)-1) And the enthalpy of exothermic decomposition (-2226J g)-1) And has good detonation performance(V＝7.81km s-1(ii) a P-24.03 GPa) and safety performance (IS)>14.2J), is a high-energy low-feel energetic polymeric material ([4 ]]Xushao-resistant Lichuping, Wang is Min, etc. A preparation method of nitrated chitosan and its application are CN201811598959.4[ P],2021.[5]Li C P,Li H,Xu K Z,et al.High-substitute nitrochitosan used as energetic materials:preparation and detonation properties[J]Carbohydrate Polymers,2020,237(01): 116176.). Therefore, the invention considers that the n-Ti is coated by the N-Ti serving as the energy-containing oxidant so as to effectively inhibit the oxidation and agglomeration of the n-Ti and enhance the dispersion performance of the n-Ti, thereby improving the combustion performance of the n-Ti.
The energetic nano metal powder has remarkable advantages as a combustion agent or a combustion additive. In particular, the nanocomposite based on nitrated chitosan according to the invention, when used as a solid propellant combustion additive, has various advantages: (1) the ignition temperature of the solid propellant can be reduced, the ignition delay time is shortened, and the ignition performance is improved; (2) the n-Ti coated by the nitrated chitosan has higher energy and excellent combustion performance, can obviously improve the energy and the combustion speed of the propellant and realize the steady-state combustion of the solid propellant; (3) the graphene oxide is introduced, and the n-Ti coated by the nitrated chitosan is more insensitive, so that the safety performance of the propellant can be improved.
The high-energy composite material nitrated chitosan/GO/n-Ti prepared by the method can be used as a nano combustion agent; can also be used as a solid propellant combustion additive.
The high-energy nano composite material nitrated chitosan/GO/n-Ti prepared by the ultrasonic-assisted acoustic resonance method is a heterogeneous mixture containing an energy-containing oxidant (nitrated chitosan) and a high-activity metal fuel (n-Ti). The introduction of the nitrated chitosan coating layer effectively inhibits the agglomeration of n-Ti powder, increases the dispersibility, obviously improves the combustion performance, and solves the problem that the nano titanium powder cannot be sufficiently combusted due to the agglomeration. In addition, the introduction of GO enables nanometer titanium shell core particles coated by the nitrated chitosan to be uniformly dispersed on the surface of a GO film, so that the ignition delay time of n-Ti is further shortened due to the excellent electric conductivity and thermal conductivity of GO, and the sustainable linear steady-state combustion of nanometer Ti is realized. The method provides a new idea for the continuous steady-state combustion of the solid propellant by taking the nano Ti powder as the combustion additive of the solid propellant.
Claims (9)
1. The preparation method of the nitrated chitosan/GO/n-Ti composite material is characterized by firstly dripping suspension of nano titanium powder into a nitrated chitosan solution, uniformly mixing through acoustic resonance, then dripping graphene oxide suspension, finally uniformly mixing through acoustic resonance, centrifugally filtering, and freeze-drying in vacuum to obtain the nitrated chitosan/GO/n-Ti composite material.
2. The method for preparing the nitrated chitosan/GO/n-Ti composite material as claimed in claim 1, wherein the nano titanium powder suspension is prepared by adding nano titanium powder into acetone or ethanol.
3. The method of claim 1, wherein the nitrated chitosan solution is prepared by adding nitrated chitosan to acetone.
4. The method for preparing the nitrated chitosan/GO/n-Ti composite material as claimed in claim 1, wherein the graphene oxide suspension is prepared by adding graphene oxide into ethanol or isopropanol.
5. The preparation method of the nitrated chitosan/GO/n-Ti composite material as claimed in claim 1, wherein the particle size of the nano titanium powder is 50 nm-200 nm.
6. The preparation method of the nitrified chitosan/GO/n-Ti composite material as claimed in claim 1, wherein the mass ratio of the nano titanium powder to the nitrified chitosan is 5: 1-9: 1.
7. The preparation method of the nitrated chitosan/GO/n-Ti composite material as claimed in claim 1, wherein the substitution degree of the nitrated chitosan is 1.8-2.1.
8. The preparation method of the nitrated chitosan/GO/n-Ti composite material as claimed in claim 1, wherein the mass of the graphene oxide is 0.5-2% of the total mass of the nano titanium powder and the nitrated chitosan.
9. Use of a nitrated chitosan/GO/n-Ti composite material prepared according to the method of any one of claims 1 to 8 as a combustion agent or combustion additive.
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