Niu Zhongwei, Bruckman Michael A, Li Siqi, Lee L Andrew, Lee Byeongdu, Pingali Sai Venkatesh, Thiyagarajan P, Wang Qian
Department of Chemistry and Biochemistry and Nanocenter, University of South Carolina, 631 Sumter Street, Columbia, South Carolina 29208, USA.
Langmuir. 2007 Jun 5;23(12):6719-24. doi: 10.1021/la070096b. Epub 2007 May 3.
One-dimensional (1D) polyaniline/tobacco mosaic virus (TMV) composite nanofibers and macroscopic bundles of such fibers were generated via a self-assembly process of TMV assisted by in-situ polymerization of polyaniline on the surface of TMV. At near-neutral reaction pH, branched polyaniline formed on the surface of TMV preventing lateral association. Therefore, long 1D nanofibers were observed with high aspect ratios and excellent processibility. At a lower pH, transmission electron microscopy (TEM) analysis revealed that initially long nanofibers were formed which resulted in bundled structures upon long-time reaction, presumably mediated by the hydrophobic interaction because of the polyaniline on the surface of TMV. In-situ time-resolved small-angle X-ray scattering study of TMV at different reaction conditions supported this mechanism. This novel strategy to assemble TMV into 1D and 3D supramolecular composites could be utilized in the fabrication of advanced materials for potential applications including electronics, optics, sensing, and biomedical engineering.
通过在烟草花叶病毒（TMV）表面原位聚合聚苯胺辅助的TMV自组装过程，制备了一维（1D）聚苯胺/烟草花叶病毒（TMV）复合纳米纤维及其宏观纤维束。在接近中性的反应pH值下，TMV表面形成支化聚苯胺，阻止横向缔合。因此，观察到具有高纵横比和优异加工性能的长一维纳米纤维。在较低pH值下，透射电子显微镜（TEM）分析表明，最初形成的是长纳米纤维，长时间反应后形成束状结构，推测是由TMV表面聚苯胺的疏水相互作用介导的。在不同反应条件下对TMV进行原位时间分辨小角X射线散射研究支持了这一机制。这种将TMV组装成一维和三维超分子复合材料的新策略可用于制造先进材料，潜在应用包括电子、光学、传感和生物医学工程。
