Flow-Induced Structures in Lyotropic Chromonic Liquid Crystals

溶致发色液晶中的流动诱导结构

基本信息

项目摘要

Non-technical Description:Liquid crystals are highly sensitive to external influences, including electric fields, magnetic fields, or mechanical stresses. The tunable properties of liquid crystals that result from this sensitivity have enabled revolutions in display technology and optical sensors. Over the past decade, a new class of liquid crystals has gained increasing attention, so-called lyotropic chromonic liquid crystals. These are water-based bio-compatible materials that therefore offer novel opportunities in biosensing and microfluidic applications. To fully harness their vastly unexplored potential, it needs to be understood how these liquid crystals respond to flow. Such an understanding, however, is currently lacking. Remarkably, flow can induce large-scale ordered structures. This project explores how these structures spontaneously emerge and how they can be controlled by tuning the flow and material properties. Integrated into the research is a comprehensive outreach plan that includes lectures for high-school students and teachers, research internships for undergraduates, and laboratory workshops for women high-school students. The project will present live science and art performances that will integrate visual, audio and dance elements to engage a broad audience in genuine scientific dialogue.Technical Description:The research probes the conditions under which self-organized structuring can be achieved in flowing nematic lyotropic chromonic liquid crystal solutions. Using a combination of advanced microscopy techniques, stability analyses, and numerical simulations, the project addresses how instabilities of the director field can trigger flow structuring and how these unstable configurations relax into macroscopic domains. In particular, two steady-state flow-induced textures are investigated: a periodic stripe pattern that occurs for planar surface anchoring conditions when the alignment is parallel to the flow direction and a band texture that emerges for a planar alignment perpendicular to the flow direction. Excitingly, the periodic stripe pattern is chiral: its mirror image cannot be superimposed on the original. This is remarkable, as the liquid crystalline units themselves are achiral, and achiral nematic liquids are generally expected to form achiral structures. The project aims to reveal the mechanism for the mirror symmetry breaking. By establishing the role of the surface anchoring conditions, the flow, and the material properties for the selection of characteristic length scales and macroscopic textures, the work will open the path to exploit flow as a simple and non-invasive pathway to intricate ordered structuring of complex fluids.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
非技术说明:液晶对外界影响非常敏感,包括电场、磁场或机械应力。这种灵敏度所产生的液晶的可调谐特性使显示技术和光学传感器发生了革命。在过去的十年里,一类新的液晶得到了越来越多的关注,即所谓的溶致变色液晶。这些是水基生物相容性材料,因此为生物传感和微流体应用提供了新的机会。为了充分利用其巨大的未开发潜力,需要了解这些液晶如何对流动做出反应。然而,目前还缺乏这样的理解。值得注意的是,流动可以诱导大规模有序结构。这个项目探索了这些结构是如何自发出现的,以及如何通过调节流动和材料特性来控制它们。该研究还包括一项全面的推广计划,其中包括针对高中生和教师的讲座、针对本科生的研究实习以及针对女高中生的实验室讲习班。该项目将提供现场科学和艺术表演,将视觉、音频和舞蹈元素结合起来,让广大观众参与真正的科学对话。技术描述:本研究探讨了在流动的向列溶致变色液晶溶液中实现自组织结构的条件。该项目结合了先进的显微技术、稳定性分析和数值模拟,研究了导向场的不稳定性如何触发流体结构,以及这些不稳定结构如何松弛到宏观区域。特别地,研究了两种稳态流诱导织构:当平面表面锚定条件下平行于流动方向时出现的周期性条纹图案和垂直于流动方向的平面排列时出现的带状织构。令人兴奋的是,周期性条纹图案是手性的:它的镜像不能叠加在原来的图案上。这是值得注意的,因为液晶单元本身是非手性的,而非手向列液体通常被期望形成非手性结构。该项目旨在揭示镜像对称性破缺的机制。通过建立表面锚定条件、流动和材料特性对特征长度尺度和宏观纹理选择的作用,这项工作将为利用流动作为复杂流体复杂有序结构的简单和非侵入性途径开辟道路。该奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

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Irmgard Bischofberger其他文献

An island of stability in a sea of fingers: emergent large-scale features of the viscous flow instability
手指海中的稳定岛:粘性流不稳定性的大规模特征
  • DOI:
  • 发表时间:
    2014
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Irmgard Bischofberger;Radha Ramachandran;S. Nagel
  • 通讯作者:
    S. Nagel
Interplay of coarsening, aging, and stress hardening impacting the creep behavior of a colloidal gel
粗化、老化和应力硬化的相互作用影响胶体凝胶的蠕变行为
  • DOI:
    10.1122/1.4986465
  • 发表时间:
    2017
  • 期刊:
  • 影响因子:
    3.3
  • 作者:
    D. Calzolari;Irmgard Bischofberger;Francesco Nazzani;V. Trappe
  • 通讯作者:
    V. Trappe
Growth morphology and symmetry selection of interfacial instabilities in anisotropic environments.
各向异性环境中界面不稳定性的生长形态和对称性选择。
  • DOI:
  • 发表时间:
    2021
  • 期刊:
  • 影响因子:
    3.4
  • 作者:
    Qing Zhang;A. Amooie;M. Bazant;Irmgard Bischofberger
  • 通讯作者:
    Irmgard Bischofberger
Multiscale Probing of Colloidal Gelation Dynamics
胶体凝胶动力学的多尺度探测
  • DOI:
  • 发表时间:
    2018
  • 期刊:
  • 影响因子:
    0
  • 作者:
    R. Abeyaratne;Irmgard Bischofberger;J. Swan
  • 通讯作者:
    J. Swan

Irmgard Bischofberger的其他文献

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