Spontaneous and x-ray-triggered crystallization at long range in self-assembling filament networks.
Spontaneous and x-ray-triggered crystallization at long range in self-assembling filament networks.
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DOI：
10.1126/science.1182340
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发表时间：
2010-01-29
期刊：
影响因子：
--
通讯作者：
Stupp SI
中科院分区：
文献类型：
--
作者：
Cui H;Pashuck ET;Velichko YS;Weigand SJ;Cheetham AG;Newcomb CJ;Stupp SI
我们在这里报告结晶在远程网络的电荷超分子丝介导的排斥力。结晶是自发的，超过了形成细丝的分子的给定浓度，但可以被较低浓度的X射线光子触发。由X射线照射形成的晶畴，其丝间间距高达320埃，在光束关闭后数小时内是稳定的，并且屏蔽丝上电荷的离子抑制了有序化。我们假设，结晶域的稳定性出现从一个平衡的排斥张力连接到本地或X-射线诱导的电荷和机械压缩截留的细丝内的网络。类似的现象可以自然地发生在细胞的细胞骨架中，并且如果在生物或人工系统中外部诱导，则导致可能的生物医学和光刻功能。
We report here crystallization at long range in networks of like-charge supramolecular filaments mediated by repulsive forces. The crystallization is spontaneous beyond a given concentration of the molecules that form the filaments, but can be triggered by X-ray photons at lower concentrations. The crystalline domains formed by X-ray irradiation, with inter-filament separations of up to 320 angstroms, are stable for hours after the beam is turned off, and ions that screen charges on the filaments suppress ordering. We hypothesize that the stability of crystalline domains emerges from a balance of repulsive tensions linked to native or X-ray induced charges and the mechanical compressive entrapment of filaments within a network. Similar phenomena may occur naturally in the cytoskeleton of cells, and if induced externally in biological or artificial systems lead to possible biomedical and lithographic functions.
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