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首页> 外文期刊>Nature nanotechnology >Confinement-induced liquid crystalline transitions in amyloid fibril cholesteric tactoids
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Confinement-induced liquid crystalline transitions in amyloid fibril cholesteric tactoids

机译:淀粉样纤维胆甾醇胆甾醇纤维纤维纤维纤维纤维素诱导诱导的液晶转变

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摘要

Chirality is ubiquitous in nature and plays crucial roles in biology, medicine, physics and materials science. Understanding and controlling chirality is therefore an important research challenge with broad implications. Unlike other chiral colloids, such as nanocellulose or filamentous viruses, amyloid fibrils form nematic phases but appear to miss their twisted form, the cholesteric or chiral nematic phases, despite a well-defined chirality at the single fibril level. Here we report the discovery of cholesteric phases in amyloids, using beta-lactoglobulin fibrils shortened by shear stresses. The physical behaviour of these new cholesteric materials exhibits unprecedented structural complexity, with confinement-driven ordering transitions between at least three types of nematic and cholesteric tactoids. We use energy functional theory to rationalize these results and observe a chirality inversion from the left-handed amyloids to right-handed cholesteric droplets. These findings deepen our understanding of cholesteric phases, advancing their use in soft nanotechnology, nanomaterial templating and self-assembly.
机译:性质上无处不在,并在生物学,医学,物理和材料科学中起着至关重要的作用。因此,理解和控制手性是具有广泛影响的重要研究挑战。与其他手性胶体不同,例如纳米纤维素或丝状病毒,淀粉样蛋白原纤维形成向列阶段,但似乎在单个原纤维水平下致密定义的手性度,似乎错过了它们的曲折形式,胆甾醇或手性竞争阶段。在这里,我们在缩短剪切应力缩短的β-乳酰叶蛋白原纤维中,我们报告了淀粉样蛋白中的胆甾醇阶段的发现。这些新的胆甾型材料的物理行为表现出前所未有的结构复杂性,其具有至少三种类型的列和胆甾醇纤维素之间的限制驱动的排序过渡。我们使用能量功能理论来合理化这些结果并观察从左手淀粉样蛋白到右手胆甾粒液滴的手性倒置。这些发现深化了我们对胆甾型阶段的理解,推进了它们在软纳米技术,纳米材料模板和自组装中的应用。

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