INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany.
J R Soc Interface. 2017 Nov;14(136). doi: 10.1098/rsif.2017.0450.
A ball-milling approach was developed to investigate the constituents of isolated nacre tablets of the gastropod in aqueous suspension without additional chemical additives. The obtained particle mixtures were characterized using X-ray crystallography as well as scanning and transmission electron microscopy. Aragonite nanoparticles retained their crystal structure even after 14 h of ball milling. The long-term stability of the particle mixtures varied as a function of the ball-milling duration. An increased milling time led to rod-like stable assemblies of aragonite nanoparticles. Selected area electron diffraction investigations revealed that the longitudinal axes in about one-third of these nanoparticle rods were oriented along the crystallographic -axis of aragonite, indicating oriented attachment of the aragonite nanoparticles. These observations support the idea that a two-stage process, separated into crystallization of nanoparticles and oriented assembly of nanocrystals, could also occur .
采用球磨方法在水悬浮液中研究腹足纲软体动物分离的珍珠层薄片的成分，无需添加其他化学添加剂。使用 X 射线晶体学以及扫描和透射电子显微镜对获得的颗粒混合物进行了表征。方解石纳米颗粒即使在球磨 14 小时后仍保留其晶体结构。颗粒混合物的长期稳定性随球磨时间的变化而变化。随着研磨时间的增加，方解石纳米颗粒形成了稳定的棒状组装体。选区电子衍射研究表明，这些纳米棒中约三分之一的纵向轴沿方解石的晶轴取向，表明方解石纳米颗粒的取向附着。这些观察结果支持这样一种观点，即也可能发生两阶段过程，分为纳米颗粒的结晶和纳米晶的取向组装。
