Zhang Junping, Wang Aiqin
Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18#, Lanzhou 730000, PR China.
J Colloid Interface Sci. 2009 Jun 15;334(2):212-6. doi: 10.1016/j.jcis.2009.03.074. Epub 2009 Apr 5.
Single-walled carbon nanotubes (SWNTs) were homogeneously dispersed in the aqueous solution of poly(N-isopropylacrylamide-co-acrylic acid) (P(NIPAm-co-AA)) with the assistance of sonification as evidenced by UV-vis absorption spectroscopy, transmission electron microscopy, field emission scanning electron microscopy and atomic force microscopy, etc. In addition, the SWNTs were endowed with pH- and thermo-sensitivity at the same time. The SWNTs switched reversibly between the aggregated and the well-exfoliated states by using pH or temperature as a stimulus. Moreover, the factors including solvent composition while preparing P(NIPAm-co-AA), concentration and composition of P(NIPAm-co-AA) showed evident influence on the dispersing stability of SWNTs. The introduction of a tiny amount of acrylic acid to copolymerize with N-isopropylacrylamide could greatly enhance dispersing ability of SWNTs.
在超声处理的辅助下，单壁碳纳米管（SWNTs）均匀分散于聚（N-异丙基丙烯酰胺-共-丙烯酸）（P（NIPAm-co-AA））的水溶液中，紫外-可见吸收光谱、透射电子显微镜、场发射扫描电子显微镜和原子力显微镜等均可证明这一点。此外，SWNTs同时具有pH和温度敏感性。通过使用pH或温度作为刺激因素，SWNTs在聚集态和良好剥离态之间可逆切换。而且，制备P（NIPAm-co-AA）时的溶剂组成、P（NIPAm-co-AA）的浓度和组成等因素对SWNTs的分散稳定性有显著影响。引入少量丙烯酸与N-异丙基丙烯酰胺共聚可大大提高SWNTs的分散能力。
