Internal dynamics of a supramolecular nanofibre.

Internal dynamics of a supramolecular nanofibre.
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DOI:
10.1038/nmat3979
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发表时间:
2014-08
期刊:
影响因子:
41.2
通讯作者:
Stupp, Samuel I.
Stupp, Samuel I.
中科院分区:
材料科学1区
文献类型:
--
作者:
Ortony, Julia H.;Newcomb, Christina J.;Matson, John B.;Palmer, Liam C.;Doan, Peter E.;Hoffman, Brian M.;Stupp, Samuel I.

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近几十年来,大量的功能性自组装超分子纳米结构被报道。这些系统的实验方法最初集中在设计分子的特定相互作用,导致离散的几何结构。最近,自组装的动力学和机械途径已经被研究,但在我们对内部构象动力学及其与功能的联系的理解中仍然存在重大差距。这一挑战已经通过引入分子动力学(MD)模拟的计算化学来解决,该模拟产生了分子随时间波动的信息。在实验上,很难获得亚纳米空间分辨率的类似数据。因此,有必要进行实验动力学测量,以确认和指导计算工作,并深入了解超分子组装体的内部运动。使用定点自旋标记和电子顺磁共振(EPR)光谱,我们测量构象动力学通过6.7 nm的横截面的一个自组装在水中,并提供了独特的见解超分子功能材料的设计。
A large variety of functional self-assembled supramolecular nanostructures have been reported over recent decades. The experimental approach to these systems initially focused on the design of molecules for specific interactions that lead to discrete geometric structures. Recently, kinetics and mechanistic pathways of self-assembly have been investigated, but there remains a major gap in our understanding of internal conformational dynamics and their links to function. This challenge has been addressed through computational chemistry with the introduction of molecular dynamics (MD) simulations, which yield information on molecular fluctuations over time. Experimentally, it has been difficult to obtain analogous data with sub-nanometer spatial resolution. Thus, there is a need for experimental dynamics measurements, to confirm and guide computational efforts and to gain insight into the internal motion in supramolecular assemblies. Using site-directed spin labeling and electron paramagnetic resonance (EPR) spectroscopy, we measured conformational dynamics through the 6.7 nm cross-section of a self-assembled nanofiber in water and provide unique insight for the design of supramolecular functional materials.
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