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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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...
Liquid–Solid Solutions01:29

Liquid–Solid Solutions

The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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 – the...
Nonideal Two-Component Liquid Solutions01:29

Nonideal Two-Component Liquid Solutions

Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

光によって誘発される液体結晶性.

Tamas Kosa1, Ludmila Sukhomlinova, Linli Su

  • 1Alpha Micron Inc., Kent, Ohio 44240, USA. tamas@alphamicron.com

Nature
|May 19, 2012
PubMed
まとめ
この要約は機械生成です。

新しいナフトピラン液晶は,光の誘発による秩序の増大を示し,透明状態から吸収状態への移行を示しています. この発見は,光学,フォトニクス,太陽エネルギーへの応用に意味を持つ.

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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

関連する実験動画

Last Updated: May 22, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

科学分野:

  • マテリアルサイエンス 材料科学
  • 物理化学 物理化学
  • オプティクスは光学です.

背景:

  • 液晶は,熱 (熱熱性) や溶媒 (溶熱性) などの刺激に対する反応によって分類される.
  • 光反応性液晶は,通常,光にさらされると順番が下がり,同熱相変遷を経験します.
  • 以前の研究では,特定の条件下での順序増加の希少な例外を除き,光誘発の順序減少が観察されました.

研究 の 目的:

  • ナフトピラン基の新種の液晶を報告する.
  • これらの材料におけるフォト誘導による順序増加相変遷を実証する.
  • これらの順序を増加させる光反応性液晶の潜在的な応用を探求する.

主な方法:

  • ナフトピラン分子の合成と機能化.
  • フォト誘発による形状の変化とその分子構造への影響に関する研究.
  • 照明曝露時の相変遷と順序パラメータの変化の特徴.

主要な成果:

  • ナフトピラン材料は,光誘発による形状の変化を示し,順序が増加する相変遷につながる.
  • 機能化されたナフトピラン分子の開いた形は,大きな順序パラメータを示しています.
  • 透明状態から吸収状態への二酸化状態の移行は,光への曝露時に観察されました.

結論:

  • この研究では,ナフトピラン基の液晶を導入し,光誘発のオーダー増加を可能にします.
  • 観測された現象は,光学,光学,レーシング,ディスプレイ,太陽エネルギー採集の分野での応用に大きな可能性を持っています.
  • フォトカロミック・サングラスのような眼科の応用には,大きなフォト誘発二重化が有望である.