• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >The grinding tip of the sea urchin tooth exhibits exquisite control over calcite crystal orientation and Mg distribution
【2h】

The grinding tip of the sea urchin tooth exhibits exquisite control over calcite crystal orientation and Mg distribution

机译：海胆齿的磨尖显示出对方解石晶体取向和镁分布的精确控制

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The sea urchin tooth is a remarkable grinding tool. Even though the tooth is composed almost entirely of calcite, it is used to grind holes into a rocky substrate itself often composed of calcite. Here, we use 3 complementary high-resolution tools to probe aspects of the structure of the grinding tip: X-ray photoelectron emission spectromicroscopy (X-PEEM), X-ray microdiffraction, and NanoSIMS. We confirm that the needles and plates are aligned and show here that even the high Mg polycrystalline matrix constituents are aligned with the other 2 structural elements when imaged at 20-nm resolution. Furthermore, we show that the entire tooth is composed of 2 cooriented polycrystalline blocks that differ in their orientations by only a few degrees. A unique feature of the grinding tip is that the structural elements from each coaligned block interdigitate. This interdigitation may influence the fracture process by creating a corrugated grinding surface. We also show that the overall Mg content of the tooth structural elements increases toward the grinding tip. This probably contributes to the increasing hardness of the tooth from the periphery to the tip. Clearly the formation of the tooth, and the tooth tip in particular, is amazingly well controlled. The improved understanding of these structural features could lead to the design of better mechanical grinding and cutting tools.
机译：海胆齿是一种出色的磨削工具。即使牙齿几乎完全由方解石组成，也可用于在通常由方解石组成的岩石基体上打孔。在这里，我们使用3个互补的高分辨率工具来探究磨尖结构的各个方面：X射线光电子发射光谱显微镜（X-PEEM），X射线微衍射和NanoSIMS。我们确认针和板是对齐的，并且在此处显示，当以20 nm分辨率成像时，即使是高Mg的多晶基质成分也与其他2个结构元素对齐。此外，我们显示出整个牙齿由2个共取向的多晶块组成，它们的方向仅相差几度。磨头的独特之处在于，每个相互对齐的块的结构元素相互交叉。这种相互交叉可能会通过形成波纹状的研磨表面来影响断裂过程。我们还表明，牙齿结构元素的总Mg含量朝着磨尖增加。这可能导致牙齿从外围到尖端的硬度增加。显然，牙齿的形成，尤其是齿尖的形成得到了令人惊讶的良好控制。对这些结构特征的加深了解可能会导致设计出更好的机械研磨和切削工具。

著录项

相似文献

  • 外文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号