本文選題：氮化硼納米管膜　切入點：球磨法　出處：《哈爾濱工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：近幾十年來,氮化硼納米管一直都以其獨特的結(jié)構(gòu)以及卓越的理化性能吸引著來自世界各國的科學家們,例如出色的機械性能和優(yōu)異的熱穩(wěn)定性,這些都使氮化硼納米管成為具有廣闊應用前景的新一代納米材料。本文采用硼涂料輔助球磨法在不銹鋼基板上制備出氮化硼納米管膜。在制備過程中,硼涂料被均勻地涂抹在不銹鋼基板上,由此可以獲得品質(zhì)好、純度高、密度大的氮化硼納米管膜。文中通過對此方法的深入研究,探索出最佳球磨參數(shù),同時對氮化硼納米管膜的生長基板進行了前期預處理,從而達到了宏量制備氮化硼納米管膜的目的。目前,對氮化硼納米管膜荷葉效應的研究成果顯著,納米膜粗糙表面上特殊的微米、納米相結(jié)合的分層結(jié)構(gòu)可以對此效應進行有效解釋。然而,氮化硼納米管膜的花瓣效應卻鮮有報道。實驗過程中發(fā)現(xiàn),通過外力作用,可以使制備在不銹鋼基板上的氮化硼納米管膜同時表現(xiàn)出超疏水狀態(tài)和高黏附力狀態(tài)。納米膜中的氮化硼納米管具有微米級的長度和納米級的直徑,粗糙表面上微米、納米尺度的交織不僅為超疏水特性的形成提供了足夠的粗糙度,更為水滴與納米膜的接觸提供了充分的接觸面積。文中通過研究氮化硼納米管膜上與荷葉效應和花瓣效應有關(guān)的多種潤濕狀態(tài),建立了水滴與納米膜接觸時的潤濕模型,并分析了不同潤濕狀態(tài)之間的轉(zhuǎn)變條件。氮化硼納米管的獨特理化性能,如高溫抗氧化、高熱傳導率和高彈性模量等,使氮化硼納米管膜在納米潤濕材料領域具有廣闊的應用空間。然而,國內(nèi)外對于氮化硼納米管膜特殊潤濕性的應用研究一直處于空白階段。本文將氮化硼納米管膜應用到直接甲醇燃料電池中,在陽極極板的微米溝道上定位生長出氮化硼納米管膜超疏水涂層,由此可以有效地減小水在溝道上的黏附,從而有利于CO2的釋放,提高燃料效率。文中采用優(yōu)化后的硼涂料輔助球磨法,使超疏水的氮化硼納米管膜定位生長在流場溝道的側(cè)壁上,同時保證陽極極板的表面只有少量甚至沒有氮化硼納米管的生長,從而使得陽極極板能夠保持不銹鋼原有的電學特性。由于氮化硼納米管具有化學惰性,微米溝道上的涂層不僅具有超疏水特性還具有抗腐蝕性,更適應陽極流場的復雜環(huán)境。此外,理論分析通過COMSOL仿真說明了局部疏水結(jié)構(gòu)形成的原因,為氮化硼納米管膜的定位生長提供了新的分析路徑。
[Abstract]:In recent decades, boron nitride nanotubes have attracted scientists from all over the world for their unique structure and excellent physical and chemical properties, such as excellent mechanical properties and excellent thermal stability. All of these make boron nitride nanotubes (BNTs) a new generation of nanomaterials with broad application prospects. In this paper, boron coating assisted ball milling method was used to prepare boron nitride nanotubes films on stainless steel substrates. Boron coatings are evenly applied on stainless steel substrates, so that boron nitride nanotube films with good quality, high purity and high density can be obtained. At the same time, the growth substrate of boron nitride nanotube film was pretreated, so as to achieve the purpose of preparing boron nitride nanotube film macroscopically. This effect can be effectively explained by the special micron structure on the rough surface of nanometer film. However, the petal effect of boron nitride nanotube film is rarely reported. The boron nitride nanotube films prepared on stainless steel substrates exhibit both superhydrophobic and high adhesion states. The boron nitride nanotubes in the films are of micron length and nanoscale diameters, and micrometers on rough surfaces. The interweaving of nanoscale not only provides enough roughness for the formation of superhydrophobic properties, In this paper, the wetting model of water droplet in contact with nanofilm was established by studying various wetting states related to lotus leaf effect and petal effect on boron nitride nanotube film. The unique physical and chemical properties of boron nitride nanotubes, such as high temperature oxidation resistance, high thermal conductivity and high elastic modulus, were analyzed. So that the boron nitride nanotube film has a wide application in the field of nano-wetting materials. The research on the special wettability of boron nitride nanotube membrane is still in blank phase. In this paper, the boron nitride nanotube membrane is applied to direct methanol fuel cell. The superhydrophobic coating of boron nitride nanotube film was grown on the microchannel of anode plate, which can effectively reduce the adhesion of water on the channel and thus facilitate the release of CO2. In this paper, the superhydrophobic boron nitride nanotube film is grown on the side wall of the channel in the flow field by using the optimized boron coating assisted ball milling method, which makes the superhydrophobic boron nitride nanotube film grow on the side wall of the channel in the flow field. At the same time, only a few or no boron nitride nanotubes grow on the surface of the anode plate, which enables the anode plate to maintain the original electrical properties of stainless steel. The coating on the micron channel has not only super hydrophobic property but also corrosion resistance, which is more suitable for the complex environment of anodic flow field. In addition, theoretical analysis and COMSOL simulation show the reason for the formation of local hydrophobic structure. It provides a new analytical path for the orientation growth of boron nitride nanotube films.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ128.1;TB383.1

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