Mir Sajjad Husain, Takasaki Yuichi, Engel Emile R, Takamizawa Satoshi
Department of Materials System Science, Graduate School of Nanobioscience, Yokohama City University 22-2 Seto, Kanazawa-ku Yokohama Kanagawa 236-0027 Japan
Kanagawa Institute of Industrial Science and Technology Shimoimaizumi 705-1 Ebina Kanagawa 243-0435 Japan.
RSC Adv. 2018 Jun 14;8(39):21933-21936. doi: 10.1039/c8ra02499e. eCollection 2018 Jun 13.
We demonstrate exceptional twinning deformation in a molecular crystal upon application of mechanical stress. Crystal integrity is preserved and the deformation is associated with a large bending angle (65.44°). This is a new strategy to increase the magnitude of the dissipated energy in an organic solid comparable to that seen in alloys. By X-ray crystallographic analysis it was determined that a large molecular rearrangement at the twinning interface preserves the crystal integrity. Drastic molecular rearrangement at the twinning interface helps to preserve hydrogen bonding in the molecular rotation, which facilitates the large bending angle. The maximum shear strain of 218.81% and dissipated energy density of 1 MJ m can significantly enhance mechanical damping of vibrations.
我们展示了在施加机械应力时分子晶体中异常的孪晶变形。晶体完整性得以保留，且该变形与一个大的弯曲角度（65.44°）相关。这是一种增加有机固体中耗散能量大小的新策略，其耗散能量大小与合金中的相当。通过X射线晶体学分析确定，孪晶界面处的大分子重排保持了晶体的完整性。孪晶界面处剧烈的分子重排有助于在分子旋转过程中保持氢键，这有利于形成大的弯曲角度。218.81%的最大剪切应变和1 MJ/m³的耗散能量密度能够显著提高振动的机械阻尼。
