Microcapsule assembly of single-walled carbon nanotubes from spray-dried hollow microspheres
Microcapsule assembly of single-walled carbon nanotubes from spray-dried hollow microspheres
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DOI：
10.2109/jcersj2.119.180
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发表时间：
2011-03
影响因子：
1.1
通讯作者：
Hui Xu;Z. Tan;H. Abe;M. Naito
中科院分区：
文献类型：
--
作者：
Hui Xu;Z. Tan;H. Abe;M. Naito
本文提出了一种利用喷雾干燥和溶剂交换技术组装单壁碳纳米管微胶囊的新方法。喷雾干燥含有非挥发性乳糖物种的单壁碳纳米管的胶体分散体形成了中空壳层微球，其中单壁碳纳米管在沉淀的乳糖壳中高度分散。然后将喷雾干燥的颗粒分散在无水乙醇中，无水乙醇是一种对乳糖不利的溶剂，乙醇通过透析逐渐与水交换。在溶剂交换作用下，乳糖和分散剂(脱氧胆酸钠)几乎完全从壳层基质中移除，使得SWCNTs非共价组装在中空壳层微胶囊结构中，通过van der Waals相互作用将其结合在一起。因此，可以使用喷雾干燥的颗粒作为模板来组装SWCNT微胶囊。
Herein a novel approach to assemble single-walled carbon nanotube (SWCNT) microcapsules using spray-drying and solvent exchange techniques is proposed. Spray drying a colloidal dispersion of SWCNTs containing a nonvolatile lactose species formed hollow-shell microspheres involving highly dispersed SWCNTs in the precipitated lactose shell. The spray-dried particles were then dispersed in absolute ethanol which is a poor solvent against lactose, and the ethanol was gradually exchanged with water through dialysis. The lactose and dispersing agent (sodium deoxycholate) were almost completely removed from the shell matrix under the solvent exchange, leaving SWCNTs non-covalently assembled in the hollow-shell microcapsule structures, held together by van der Waals interactions. Thus, the SWCNT microcapsules can be assembled using the spray-dried particles as “templates”.