本文選題：碳納米管 + 非均勻氫等離子體　； 參考：《南華大學(xué)》2015年碩士論文

【摘要】：現(xiàn)代軍事隱身和民用微波防護對吸波材料提出了越來越高的要求。質(zhì)量輕,力學(xué)性能好,具有特殊電磁性能的碳納米管及其復(fù)合材料的合成,為吸波材料開辟了一個新的領(lǐng)域。碳納米管具有良好的吸附儲氫性能,在微波作用下,其高頻電磁場能使碳納米管中的氫氣激發(fā)而產(chǎn)生氫等離子體。初步實驗研究表明,碳納米管氫等離子體是最具有應(yīng)用前景的碳納米管吸波材料。本課題組研究了碳納米管均勻氫等離子體的微波吸收特性。實際上,碳納米管氫等離子體是不均勻的,本文在已有成果的基礎(chǔ)上,理論研究了等離子體密度分布和磁場強度對碳納米管中氫等離子體微波吸收的影響,構(gòu)建了碳納米管非均勻氫等離子體薄膜介電特性的層狀模型,運用轉(zhuǎn)移矩陣法求解電磁波的傳播方程,導(dǎo)出了碳納米管中非均勻氫等離子體的微波衰減系數(shù)公式,數(shù)值計算了不同密度分布和不同磁場強度條件下的碳納米管氫等離子體薄膜對微波的衰減系數(shù)。研究結(jié)果表明:氫等離子體的密度分布和外加磁場強度對其微波吸收有重要影響;按比例增大氫等離子體中自由電子密度的非均勻性時,微波衰減吸收系數(shù)增大,吸收峰向高頻方向移動;隨著外加磁場強度增大,碳納米管氫等離子體薄膜的微波吸收峰向高頻移動,入射電磁波在碳納米管非均勻氫等離子體薄膜中的能量衰減大于30d B/cm的頻寬增大,有利于微波吸收;數(shù)值結(jié)果與已獲得的實驗數(shù)據(jù)相吻合。結(jié)合本課題組以前的研究成果可知,只要適當(dāng)控制碳納米管中等離子體的自由電子密度、電子碰撞的有效頻率和外加磁場強度,就能夠?qū)崿F(xiàn)碳納米管中氫等離子體薄膜對微波的調(diào)諧吸收。本論文的研究目的是為碳納米管氫等離子體應(yīng)用于現(xiàn)代軍事隱身和民用微波防護提供理論參考。
[Abstract]:Modern military stealth and civil microwave protection put forward higher and higher requirements for absorbing materials. The synthesis of carbon nanotubes and its composites with light weight, good mechanical properties and special electromagnetic properties opens up a new field for absorbing materials. Carbon nanotubes (CNTs) have good hydrogen adsorption and storage properties. The high frequency electromagnetic field of carbon nanotubes (CNTs) can excite hydrogen in carbon nanotubes and produce hydrogen plasma under microwave irradiation. The preliminary experimental results show that carbon nanotube hydrogen plasma is the most promising microwave absorbing material for carbon nanotubes. The microwave absorption characteristics of carbon nanotube homogeneous hydrogen plasma were studied. In fact, carbon nanotube hydrogen plasma is inhomogeneous. In this paper, the effects of plasma density distribution and magnetic field intensity on the microwave absorption of hydrogen plasma in carbon nanotubes are theoretically studied. A layered model of dielectric properties of carbon nanotubes (CNTs) inhomogeneous hydrogen plasma films was constructed. The microwave attenuation coefficient formula of carbon nanotubes inhomogeneous hydrogen plasma was derived by solving the electromagnetic wave propagation equation by using the transfer matrix method. The microwave attenuation coefficients of carbon nanotube hydrogen plasma films with different density distributions and different magnetic field intensities are numerically calculated. The results show that the density distribution of hydrogen plasma and the applied magnetic field intensity have important influence on the microwave absorption, and the microwave attenuation absorption coefficient increases when increasing the inhomogeneity of free electron density in hydrogen plasma proportionally. With the increase of magnetic field intensity, the microwave absorption peak of carbon nanotube hydrogen plasma film shifts to high frequency. The energy attenuation of incident electromagnetic wave in carbon nanotube (CNT) inhomogeneous hydrogen plasma film is larger than that of 30d B/cm, which is favorable to microwave absorption, and the numerical results are in agreement with the experimental data obtained. Combined with the previous research results of our group, we can see that if the free electron density of the plasma in carbon nanotubes is properly controlled, the effective frequency of electron collision and the applied magnetic field intensity can be obtained. It is possible to realize the tunable absorption of hydrogen plasma film to microwave in carbon nanotubes. The purpose of this paper is to provide a theoretical reference for the application of carbon nanotube hydrogen plasma in modern military stealth and civil microwave protection.
【學(xué)位授予單位】：南華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.1

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相關(guān)期刊論文 前1條

1 張娟玲;崔\~;;碳納米管/聚合物復(fù)合材料[J];化學(xué)進展;2006年10期

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本文編號：1937025