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首页> 美国卫生研究院文献>Molecules >Effect of Surfactants and Manufacturing Methods on the Electrical and Thermal Conductivity of Carbon Nanotube/Silicone Composites
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Effect of Surfactants and Manufacturing Methods on the Electrical and Thermal Conductivity of Carbon Nanotube/Silicone Composites

机译：表面活性剂和制备方法对碳纳米管/硅树脂复合材料电导率和导热率的影响

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摘要

The effect of ionic surfactants and manufacturing methods on the separation and distribution of multi-wall carbon nanotubes (CNTs) in a silicone matrix are investigated. The CNTs are dispersed in an aqueous solution of the anionic surfactant dodecylbenzene sulfonic acid (DBSA), the cationic surfactant cetyltrimethylammonium bromide (CTAB), and in a DBSA/CTAB surfactant mixture. Four types of CNT-based composites of various concentrations from 0 to 6 vol.% are prepared by simple mechanical mixing and sonication. The morphology, electrical and thermal conductivity of the CNT-based composites are analyzed. The incorporation of both neat and modified CNTs leads to an increase in electrical and thermal conductivity. The dependence of DC conductivity versus CNT concentration shows percolation behaviour with a percolation threshold of about 2 vol.% in composites with neat CNT. The modification of CNTs by DBSA increases the percolation threshold to 4 vol.% due to the isolation/separation of individual CNTs. This, in turn, results in a significant decrease in the complex permittivity of CNT–DBSA-based composites. In contrast to the percolation behaviour of DC conductivity, the concentration dependence of thermal conductivity exhibits a linear dependence, the thermal conductivity of composites with modified CNTs being lower than that of composites with neat CNTs. All these results provide evidence that the modification of CNTs by DBSA followed by sonication allows one to produce composites with high homogeneity.
机译：研究了离子表面活性剂和制造方法对有机硅基质中多壁碳纳米管（CNT）分离和分布的影响。将CNT分散在阴离子表面活性剂十二烷基苯磺酸（DBSA），阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）的水溶液中和DBSA / CTAB表面活性剂混合物中。通过简单的机械混合和超声处理，制备了四种浓度从0％至6％（体积）的CNT基复合材料。分析了CNT基复合材料的形貌，电导率和导热率。纯的和改性的CNT的结合导致电导率和导热率的增加。直流电导率与CNT浓度的相关性表明，在具有纯CNT的复合材料中，渗滤行为约为2 vol。％。由于各个CNT的分离/分离，通过DBSA对CNT进行的改性将渗滤阈值提高到4％（体积）。反过来，这导致CNT-DBSA基复合材料的复介电常数大大降低。与直流电导率的渗透行为相反，热导率的浓度依赖性表现出线性依赖性，具有改性CNT的复合材料的热导率低于具有纯净CNT的复合材料的热导率。所有这些结果提供了证据，表明通过DBSA对CNT进行改性，然后进行超声处理，可以生产出具有高均质性的复合材料。

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