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Development of Stable Boron Nitride Nanotube and Hexagonal Boron Nitride Dispersions for Electrophoretic Deposition
Langmuir ( IF 3.9 ) Pub Date : 2020-03-24 , DOI: 10.1021/acs.langmuir.0c00018
Benjamin J. Mapleback 1 , Narelle Brack 2 , Liam Thomson 2 , Michelle J. S. Spencer 3 , Dale A. Osborne 3 , Sagar Doshi 4 , Erik T. Thostenson 4 , Andrew N. Rider 1
Affiliation  

Boron nitride nanotubes (BNNTs) represent a relatively new class of materials that provides alternative electrical and thermal properties to the carbon analogue. The high chemical and thermal stability and large band gap combined with high electrical resistance make BNNTs desirable in several thin-film applications. In this study, stable BNNT and hexagonal boron nitride (hBN) particle dispersions have been developed using environmentally friendly advanced oxidation processing (AOP) that can be further modified for electrophoretic deposition (EPD) to produce thin films. The characterization of the dispersions has revealed how the hydroxyl radicals produced in AOP react with BNNT/hBN and contaminant boron nanoparticles (BNPs). While the radicals remove the carbon contaminant present on BNNT/hBN and increase dispersion stability, they also oxidize the BNPs and the boron oxide produced, which, conversely, reduces the dispersion stability. The use of high- or low-powered ultrasonication in combination with the AOP affects the rate of the competing reactions, with low-powered sonication and AOP providing the best combination for producing stable dispersions with high concentrations. BNNT/hBN dispersions were functionalized with polyethyleneimine to facilitate EPD, where films of several micrometer thickness were readily deposited onto stainless steel and glass-fiber fabrics. BNNT/hBN films produced on glass fabrics by EPD exhibited a consistent through-thickness macroporosity that was facilitated by platelet and nanotube stacking. The film macroporosity present on the coated fabrics was suitable for use as separator layers in supercapacitors and provided improved device robustness with a minimal impact on electrochemical performance.

中文翻译:

稳定的氮化硼纳米管和六方氮化硼分散体电泳沉积的研制

氮化硼纳米管(BNNT)代表了一类相对较新的材料,可为碳类似物提供替代的电气和热性能。高化学稳定性和热稳定性以及较大的带隙和高电阻使BNNTs在几种薄膜应用中很理想。在这项研究中,使用环境友好的高级氧化工艺(AOP)开发了稳定的BNNT和六方氮化硼(hBN)颗粒分散体,可以对其进行进一步修饰以用于电泳沉积(EPD)以生产薄膜。分散体的表征揭示了AOP中产生的羟基自由基如何与BNNT / hBN和杂质硼纳米粒子(BNP)反应。自由基清除了BNNT / hBN上存在的碳污染物并增加了分散稳定性,它们还会氧化生成的BNP和氧化硼,反之会降低分散稳定性。高功率或低功率超声处理与AOP结合使用会影响竞争反应的速度,低功率超声处理和AOP为生产高浓度稳定分散体提供了最佳组合。BNNT / hBN分散体用聚乙烯亚胺官能化以促进EPD,其中几微米厚的膜很容易沉积在不锈钢和玻璃纤维织物上。EPD在玻璃织物上生产的BNNT / hBN膜表现出一致的贯穿厚度的大孔隙率,这是由于血小板和纳米管的堆积而促进的。
更新日期:2020-03-24
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