Multi-Directional Organosuperelastic Crystal Made by Versatile Ferroelastical Reshaping.
Multi-Directional Organosuperelastic Crystal Made by Versatile Ferroelastical Reshaping.
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DOI：
10.1002/anie.201914954
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发表时间：
2020-01
影响因子：
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通讯作者：
Toshiyuki Sasaki;Shunichi Sakamoto;Yuichi Takasaki;S. Takamizawa
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文献类型：
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作者：
Toshiyuki Sasaki;Shunichi Sakamoto;Yuichi Takasaki;S. Takamizawa
机械孪晶改变了原子、分子和晶体的取向，并随晶体材料各向异性性质的方向变化，保持了晶体各畴的单晶性。然而，尽管脆性有机晶体具有显著的各向异性功能，但对其变形性的研究较少。在此，我们证明了在1,3-双（4-甲氧基苯基）尿素单晶中，方向相关的机械孪晶在一个方向上表现出超弹性，在另外两个方向上表现出铁弹性。该晶体可以进行逐步孪晶，并具有铁弹性，形成具有不同方向的多个畴的各种形状，从而形成具有多方向超弹性的晶体。铁弹性和超弹性单晶在环境条件下的这种适应性和形状可恢复性对有机晶体作为机械材料的未来应用如软机器人具有重要意义。
echanical twinning changes atomic, molecular, and crystal orientations along with directions of anisotropic properties of crystalline materials in keeping single crystallinity in each domain. However, such deformability has been less studied in brittle organic crystals despite their remarkable anisotropic functions. Herein we demonstrate direction-dependent mechanical twinning showing superelasticity in a direction and ferroelasticity in other two directions in a single crystal of 1,3-bis(4-methoxyphenyl)urea. The crystal can undergo stepwise twinning and ferroelastically forms various shapes with multiple domains oriented toward different directions, affording a crystal showing superelasticity to multiple directions. Such adaptability and shape recoverability achieved in a ferroelastic and superelastic single crystal at ambient condition are of great importance in future applications of organic crystals as mechanical materials such as in soft robotics.