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首页> 外文会议>Symposium on Spatially Resolved Characterization of Local Phenomena in Materials and Nanostructures Dec 2-6, 2002 Boston, Massachusetts, U.S.A. >Nanofiber Formation in Spider Dragline-Silk as Probed by Atomic Force Microscopy and Molecular Pulling
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Nanofiber Formation in Spider Dragline-Silk as Probed by Atomic Force Microscopy and Molecular Pulling

机译：原子力显微镜和分子牵拉探测到的蜘蛛拉铲丝中的纳米纤维形成

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摘要

Despite the extensive interest in its remarkable materials properties, the structure of spider dragline silk is not yet known. Indirect structural information is thus of particular interest. New data are presented here from two probe microscopy techniques ― atomic force microscopy (AFM) and single-molecule force spectroscopy, or 'molecular pulling.' Using a soluble synthetic protein from dragline silk, segmented silk nanofibers have been observed by AFM. Molecular pulling (Force Spectroscopy) has revealed sawtooth-like rupture peaks, indicative of the sacrificial bonds and hidden lengths seen in molecules of other self-healing biomaterials. A model is presented for the folding of single dragline-silk molecules and the arrangement of these molecules into nanofibers. The relationship is discussed between these molecularanoscale results and the materials properties of natural and artificial dragline silks.
机译：尽管对其引人注目的材料特性引起了广泛的兴趣，但蜘蛛拉铲丝的结构仍未知。因此，间接结构信息尤其令人关注。这里有两种探针显微镜技术提供了新数据-原子力显微镜（AFM）和单分子力光谱法或“分子拉力”。使用来自拉铲丝的可溶性合成蛋白，AFM已观察到分段的丝纳米纤维。分子拉力（力谱）揭示了锯齿状的破裂峰，表明在其他自我修复生物材料的分子中看到的牺牲键和隐藏长度。提出了一个模型，用于折叠单个拉铲丝-丝绸分子并将这些分子排列成纳米纤维。讨论了这些分子/纳米级结果与天然和人工拉铲丝的材料特性之间的关系。

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