Stepwise Rotation of Nanometric Building Blocks in the Aragonite Helix of a Pteropod Shell

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• 作者：Monami Suzuki ; Takenori Sasaki ; Yuya Oaki ; Hiroaki Imai
• 刊名：Crystal Growth & Design
• 出版年：2017
• 出版时间：January 4, 2017
• 年：2017
• 卷：17
• 期：1
• 页码：191-196
• 全文大小：462K
• ISSN：1528-7505

文摘

Aragonite helical fibers in the shell of a pteropod Cavolinia globulosa are shown to consist of single-crystalline rod-like building blocks ∼1 μm long and ∼100–200 nm wide. Although the building blocks of the orthorhombic crystal share similar c-axis orientations along the surface normal, their a and b directions rotate in a stepwise fashion. The crystallographic rotation of the unit rods and the twisted stacking of the fibers along the helical axis form the specific hierarchical architecture of the pteropod shell.