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相关概念视频

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Adaptability of Cytoskeletal Filaments01:12

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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
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Shape Memory Polymers for Active Cell Culture
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自适应的合晶体中的形状记忆

Seungkyu Lee1,2, Heather A Calcaterra2,3, Sangmin Lee4,5

  • 1Department of Chemistry, Northwestern University, Evanston, USA.

Nature
|October 17, 2022
PubMed
概括
此摘要是机器生成的。

通过DNA工程制造的状晶体具有显著的机械弹性. 这些材料可以变形,在重新水后迅速恢复原始结构和光学特性.

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科学领域:

  • 材料科学
  • 纳米技术
  • 软物质物理学

背景情况:

  • 可重新配置,机械响应的晶体材料对于先进的设备至关重要.
  • 晶体的变形恢复在很大程度上取决于结合类型,分子结合允许比静电相互作用更大的弹性.

研究的目的:

  • 研究DNA工程结合体晶体的变形特性.
  • 了解这些工程结晶中的机械变形和可逆光学性能变化之间的关系.

主要方法:

  • 制造大型 (大于100μm) 体晶体,以体为中心的立体结构和高粘弹性体积分数 (超过97%).
  • 将晶体压缩成不规则的形状,然后再加水以观察结构恢复.
  • 在变形前,变形期间和变形后分析光学性能变化 (吸收和反射).

主要成果:

  • 结合体晶体变形为不规则的形状,并出现纹和纹,在重新水后迅速恢复了它们的初始形态和纳米级秩序.
  • 不同于大多数晶体材料, 这些DNA工程晶体持续显著的结构变化没有永久的损伤.
  • 变形导致光学性质的可逆变化,包括由于折射率和不均质的变化而增加的反射率 (高达50%),而回收的晶体显示出高宽带吸收率 (超过98%).

结论:

  • 经过DNA工程的合晶体表现出极好的机械反应能力和快速的自我愈合能力.
  • 可逆结构和光学特性变化突显了它们在适应性材料和响应性设备中的应用潜力.