作者：Nan Yan, Yuping Sheng, Hongxia Liu, Yutian Zhu, Wei Jiang
关键字：嵌段共聚物, 模板自组装, 瑞利不稳定性, 阳极氧化铝模板, 纳米管, 纳米球
论文来源：期刊
具体来源：Langmuir, 2015, 31(5), 1660-1669
发表时间：2015年

摘要：研究了聚苯乙烯-b-聚4-乙烯基吡啶（PS-b-P4VP）在阳极氧化铝（AAO）模板纳米孔中的自组装行为，以及随后由瑞利不稳定性驱动的形貌转变。通过用PS-b-P4VP/氯仿溶液润湿AAO模板并蒸发溶剂，制备了具有多种内部纳米结构的PS-b-P4VP纳米管和纳米棒；去除AAO模板后，分别用氯仿、甲苯和N,N-二甲基甲酰胺等不同品质的溶剂对水相中悬浮的纳米管和纳米棒进行溶胀退火。氯仿和甲苯退火可观察到纳米结构PS-b-P4VP纳米管或纳米棒向有序纳米球的形貌转变，而DMF退火后形貌保持不变，表明溶剂品质是调控形貌和内部结构的关键因素。进一步进行了从二维BCP纳米管/纳米棒向三维BCP纳米球转变的动力学研究和理论分析，形态演化和定量计算证实该转变由瑞利不稳定性诱导。该研究提供了一种简单而有前景的溶剂退火方法，用于制备具有有序内部纳米结构的BCP纳米球，在药物递送等纳米技术领域具有潜在应用。

Abstract：In the current study, the self-assembly of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) confined in the nanopores of an anodic aluminum oxide (AAO) template and the subsequent morphology transformation induced by the Rayleigh instability are investigated. PS-b-P4VP nanotubes and nanorods with various internal nanostructures are fabricated by wetting the AAO template with PS-b-P4VP/chloroform solution followed by solvent evaporation. After removal of the AAO template, several different solvents (chloroform, toluene, and N,N-dimethylformamide) with different qualities are used to swell and anneal those nanotubes and nanorods suspended in aqueous media. Morphology transformation from nanostructured PS-b-P4VP nanotubes or nanorods to ordered nanospheres is observed by annealing upon chloroform and toluene, while the morphology remains unchanged upon N,N-dimethylformamide annealing, indicating that solvent quality is a key factor in tuning the morphology and internal structures. Kinetics study and theoretical analysis confirm that this transition is induced by the Rayleigh instability. This study provides a simple but promising solvent annealing method for the fabrication of BCP nanospheres with ordered internal nanostructures, which may have great application in drug delivery and other nanotechnology.

论文链接：https://doi.org/10.1021/la504672x