関連する実験動画
Updated: May 10, 2026

10:53
Shape Memory Polymers for Active Cell Culture
Published on: July 4, 2011
14.1K
形状記憶とメカノサリント分子結晶における自己治癒効果
Durga Prasad Karothu1, James Weston1, Israel Tilahun Desta1
1New York University Abu Dhabi , P.O. Box 129188, Abu Dhabi, United Arab Emirates.
Journal of the American Chemical Society
|September 13, 2016
まとめ
熱塩酸テレフタル酸結晶は,機械的に刺激されたときに形状を逆転させ,ジャンプし,驚くべき機械的順守を示します. ストレスの解き放たれによって引き起こされるこのメカノサリエンスの効果は,結晶領域の再構成と自己治癒の特性を示します.
科学分野:
- 材料科学
- クリスタルグラフィー
- メカニクス
背景:
- 熱性材料は,熱刺激に反応して形状が逆転する.
- テレフタル酸結晶は,自発的および誘発的相変化を含むユニークな熱塩素特性を示します.
- このような結晶の機械的振る舞いを理解することは 高度な材料の開発に不可欠です
研究 の 目的:
- テレフタル酸の結晶におけるメカノサリント効果を調査する.
- 形状の変化と運動のメカニズムを解明する
- この結晶の自己治癒と記憶の性質を 調べるためだ
主な方法:
- 高速光学分析で 形状の急速な変化を捉える
- 連続スキャニング電子顕微鏡で,クリスタル領域のダイナミクスを観察する.
- メカニカルな刺激で 段階転換を誘発し 反応を分析する
主要な成果:
- 結晶は異常な機械的適合と 逆向きの形状変化を示しています
- 機械的に刺激された運動は 局所的なストレスによって引き起こされ 結晶が跳ね上がります
- ミリ秒のスケールで結晶領域の急速な再構成が観察されました.
- 結晶は形状記憶ポリマーに似た 記憶効果と自己修復能力を示しました
結論:
- メカノサリント効果は,分子固体におけるマルテンサイト型変異の顕微鏡的表れである.
- 損傷した結晶の自己治癒には分子間π-π相互作用が作用する.
- これらの発見は 反応性のある分子材料の設計に 洞察を与えてくれます
関連する概念動画
Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Mechanisms of Membrane-bending
The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Mechanisms of Membrane Domain Formation
Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
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...
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...
Imperfections in Crystal Structure: Point, Line and Plane Defects
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Imperfections in Crystal Structure: Stoichiometric Point Defects
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

