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arXiv 1509.03076cond-mat.softcond-mat.mtrl-sci
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具有温度依赖性的软质自组装纳米粒子

Soft self-assembled nanoparticles with temperature-dependent properties

Lorenzo Rovigatti, Barbara Capone, Christos N. Likos

摘要:

制造可靠地自组装成所需有序和无序相的多功能构建块是当代材料科学中最热门的话题之一。为此,不同复杂性的微观单元,旨在组装目标阶段,已经被认为,设计,调查和建造。这样的路径通常需要费力的制造技术,特别是当需要构建块的特定功能化时。螺旋星形聚合物,即,由许多$f$二嵌段共聚物制成的星形聚合物自发地自组装成表面上具有吸引点(斑块)的软斑块状颗粒,所述二嵌段共聚物由接枝在中心锚定点上的疏溶剂和亲溶剂单体组成。在这里,我们表明,这样一个系统的可调性可以广泛地扩展通过控制溶液的物理和化学参数。事实上,在固定的外部条件下,自组装行为仅取决于臂的数量和/或疏溶剂与亲溶剂单体的比例。然而,温度和/或溶剂质量的变化使得可以可靠地改变有吸引力的贴片的数量和尺寸。这允许在不修改微观成分的情况下操纵介观自组装行为。有趣的是,我们还证明了不同的参数组合可以产生相同数量的补丁,但不同的径向和角刚度的恒星。这种机制可以提供一种在不改变其拓扑结构的情况下进一步微调超分子网络弹性特性的简洁方法。

英文摘要:

The fabrication of versatile building blocks that are reliably self-assemble into desired ordered and disordered phases is amongst the hottest topics in contemporary material science. To this end, microscopic units of varying complexity, aimed at assembling the target phases, have been thought, designed, investigated and built. Such a path usually requires laborious fabrication techniques, especially when a specific funcionalisation of the building blocks is required. Telechelic star polymers, i.e., star polymers made of a number $f$ of di-block copolymers consisting of solvophobic and solvophilic monomers grafted on a central anchoring point, spontaneously self-assemble into soft patchy particles featuring attractive spots (patches) on the surface. Here we show that the tunability of such a system can be widely extended by controlling the physical and chemical parameters of the solution. Indeed, at fixed external conditions the self-assembly behaviour depends only on the number of arms and/or on the ratio of solvophobic to solvophilic monomers. However, changes in temperature and/or solvent quality makes it possible to reliably change the number and size of the attractive patches. This allows to steer the mesoscopic self-assembly behaviour without modifying the microscopic constituents. Interestingly, we also demonstrate that diverse combinations of the parameters can generate stars with the same number of patches but different radial and angular stiffness. This mechanism could provide a neat way of further fine-tuning the elastic properties of the supramolecular network without changing its topology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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