Enhanced Environmental Mobility of Carbon Nanotubes in the Presence of Humic Acid and Their Removal from Aqueous Solution
Enhanced Environmental Mobility of Carbon Nanotubes in the Presence of Humic Acid and Their Removal from Aqueous Solution
复制标题
DOI：
10.1002/smll.200800753
复制
发表时间：
2008-12-01
期刊：
影响因子：
13.3
通讯作者：
Keller, Arturo A.
中科院分区：
文献类型：
--
作者：
Wang, Peng;Shi, Qihui;Keller, Arturo A.
碳纳米管是制备具有独特光学、电学和机械性能的复合材料的重要结构块，其产量有望在未来几年大幅增加。[1]这可能会增加人类和环境接触碳纳米管的风险。[1D-h]碳纳米管具有极强的疏水性，容易聚集，因为它们沿其长轴受到较高的范德华力，因此不易分散在水或非水溶液中；这一直是碳纳米管在工业上应用的主要障碍。[2]因此，人们对碳纳米管在水溶液中的分散方法给予了极大的关注。碳纳米管的面外功能化方法有两种：共价法和非共价法。非共价法更可取，因为它们对碳纳米管的内在结构和性质的破坏很小。在实验室测试的碳纳米管非共价功能化分散剂包括表面活性剂、合成聚合物和生物聚合物。
Carbon nanotubes (CNTs) are important structural blocks for the preparation of composites with unique optical, electrical, and mechanical properties, and their production is expected to increase drastically in the years to come.[1] This may increase the risk of human and environmental exposure to CNTs.[1d–h] CNTs are extremely hydrophobic and prone to aggregation, as they are subject to higher van der Waals forces along their length axis, and therefore are not readily dispersed in aqueous or non-aqueous solutions; this has been a major obstacle for the application of CNTs in industry.[2] As a result, significant attention has been directed towards methods of CNT dispersion in aqueous solution. Two methods of exohedral functionalization of CNTs have been developed to disperse them; covalent [3] and non-covalent methods.[4] Non-covalent methods are more desirable since they incur little damage to the CNTs’ intrinsic structures and properties. Dispersants tested in the laboratory for non-covalent functionalization of CNTs include surfactants, synthetic polymers, and biopolymers.[4]