Université de Pau et des Pays de l'Adour/CNRS, Laboratoire de Chimie analytique Bio-Inorganique et Environnement, UMR IPREM 5254-Technopôle Hélioparc, Av. du Président Angot. 64053, Pau Cedex. France.
Analyst. 2012 Feb 21;137(4):917-23. doi: 10.1039/c2an15449h. Epub 2011 Dec 20.
This work demonstrates the potential of asymmetrical flow field-flow fractionation (A4F) coupled to Ultraviolet spectrometry (UV) and multi-angle light scattering (MALS) for the study of single-walled carbon nanotube (SWCNT) dispersion in aqueous solutions containing a surfactant. The results indicate that this technique is a powerful analytical tool that is able to evaluate SWCNT dispersion states in aqueous media and, more importantly, determine the presence or absence of aggregates, the numbers and sizes of different SWCNT populations and the SWCNT size distribution. Dynamic light scattering was employed to complete and demonstrate the relevance of the data that were obtained via A4F-UV-MALS. Two different anionic surfactants that are used to disperse SWCNTs were then studied. The dispersing powers of the surfactants were experimentally evaluated based on their structural organizations. This study demonstrates that surfactant concentration and sonication energy are key parameters that control the SWCNT dispersion state and SWCNT structural integrity therein.
这项工作展示了非对称流场流分离（A4F）与紫外光谱（UV）和多角度光散射（MALS）相结合在研究含有表面活性剂的水溶液中单壁碳纳米管（SWCNT）分散体的潜力。结果表明，该技术是一种强大的分析工具，能够评估 SWCNT 在水介质中的分散状态，更重要的是，确定是否存在聚集体、不同 SWCNT 群体的数量和大小以及 SWCNT 的尺寸分布。动态光散射用于完成并证明通过 A4F-UV-MALS 获得的数据的相关性。然后研究了两种用于分散 SWCNT 的不同阴离子表面活性剂。根据它们的结构组织，实验评估了表面活性剂的分散能力。这项研究表明，表面活性剂浓度和超声能量是控制 SWCNT 分散状态和其中 SWCNT 结构完整性的关键参数。
