Ultrasound Stimulated Nucleation and Growth of a Dye Assembly into Extended Gel Nanostructures
作者:Joanna M. Malicka、Anjamkudy Sandeep、Filippo Monti、Elisa Bandini、Massimo Gazzano、Choorikkat Ranjith、Vakayil K. Praveen、Ayyappanpillai Ajayaghosh、Nicola Armaroli
DOI:10.1002/chem.201301539
日期:2013.9.23
sonication‐induced gelation. Furthermore, in order to probe the effects of nanoscale substrates on the sonication‐induced self‐assembly, a minuscule amount of single‐walled carbon nanotubes was added, which leads to acceleration of the self‐assembly through a heterogeneous nucleation process that ultimately affords a supramolecular gel with nanotape‐like morphology. This study demonstrates that self‐assembly of functional
已合成并充分表征了一种方丁酸染料,该方酸染料通过能够自组装的柔性二酰胺键(GA-SQ)与庞大的三烷氧基苯基部分官能化。将GA‐SQ的热溶液快速冷却至0°C会导致自组装沉淀物,该沉淀物由两种类型的纳米结构组成:环和不确定的短纤维。超声的应用改变了过饱和介导的成核条件,仅产生一种核,并促进了晶体纤维结构的形成,诱导了溶剂分子的凝胶化。GA-SQ的独特自组装行为在超声刺激下,已经通过吸收,发射,FT-IR,XRD,SEM,AFM和TEM技术进行了详细研究。这些研究揭示了自组装材料的成核生长机制,这在超声诱导胶凝领域很少受到关注。此外,为了探究纳米级基质对超声诱导的自组装的影响,添加了微量的单壁碳纳米管,从而通过异质成核过程加速了自组装,最终提供了具有纳米带状形态的超分子凝胶。这项研究表明,功能性染料的自组装可以通过外部刺激来明智地操纵,并且可以通过添加碳纳米管来进一步控制。