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首页> 外文期刊>Chemistry: A European journal >Enhanced adsorption affinity of anionic perylene-based surfactants towards smaller-diameter SWCNTs
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Enhanced adsorption affinity of anionic perylene-based surfactants towards smaller-diameter SWCNTs

机译：阴离子per基表面活性剂对小直径SWCNT的吸附亲和力增强

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摘要

We present evidence from multiple characterization methods, such as emission spectroscopy, zeta potential, and analytical ultracentrifugation, to shed light on the adsorption behavior of synthesized perylene surfactants on single-walled carbon nanotubes (SWCNTs). On comparing dispersions of smaller-diameter SWCNTs prepared by using cobalt-molybdenum catalysis (CoMoCAT) with the larger-diameter SWCNTs prepared by high-pressure carbon monoxide decomposition (HiPco), we find that the CoMoCAT-perylene surfactant dispersions are characterized by more negative zeta potentials, and higher anhydrous specific volumes (the latter determined from the sedimentation coefficients by analytical ultracentrifugation), which indicates an increased packing density of the perylene surfactants on nanotubes of smaller diameter. This conclusion is further supported by the subsequent replacement of the perylene derivatives from the nanotube sidewall by sodium dodecyl benzene sulfonate (SDBS), which first occurs on the larger-diameter nanotubes. The enhanced adsorption affinity of the perylene surfactants towards smaller-diameter SWCNTs can be understood in terms of a change in the supramolecular arrangement of the perylene derivatives on the scaffold of the SWCNTs. These findings represent a significant step forward in understanding the noncovalent interaction of π-surfactants with carbon nanotubes, which will enable the design of novel surfactants with enhanced selectivity for certain nanotube species. Nanotube surfactant design: The interactions of synthesized perylene-based surfactants with single-walled carbon nanotubes (SWCNTs) of various diameters have been investigated. The surfactants exhibit an enhanced adsorption affinity towards smaller-diameter SWCNTs (see figure), which could be of great importance for future nanotube separation by selective dispersion.
机译：我们提供了多种表征方法的证据，例如发射光谱，ζ电势和分析超速离心，以阐明合成的per表面活性剂在单壁碳纳米管（SWCNTs）上的吸附行为。通过比较使用钴钼催化（CoMoCAT）制备的小直径SWCNT与通过高压一氧化碳分解（HiPco）制备的大直径SWCNT的分散液，我们发现CoMoCAT- surfactant表面活性剂分散液的负值更大ζ电位和较高的无水比容（后者通过分析超速离心由沉降系数确定），这表明the表面活性剂在较小直径的纳米管上的堆积密度增加。随后用十二烷基苯磺酸钠（SDBS）取代纳米管侧壁上的per衍生物，进一步支持了该结论，十二烷基苯磺酸钠首先出现在大直径的纳米管上。 the表面活性剂对小直径SWCNT的增强的吸附亲和力可以从per碳纳米管衍生物在SWCNT的支架上的超分子排列的变化方面理解。这些发现代表了理解π表面活性剂与碳纳米管之间非共价相互作用的重要一步，这将使设计新型纳米表面活性剂对某些纳米管具有更高的选择性。纳米管表面活性剂设计：研究了合成的per基表面活性剂与各种直径的单壁碳纳米管（SWCNT）的相互作用。表面活性剂对较小直径的SWCNT表现出增强的吸附亲和力（见图），这对于将来通过选择性分散分离纳米管可能非常重要。

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