Substitutional impurity-induced vitrification in microgel crystals
Substitutional impurity-induced vitrification in microgel crystals
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DOI：
10.1039/c3sm50471a
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发表时间：
2013-01-01
期刊：
影响因子：
3.4
通讯作者：
Sprakel, Joris
中科院分区：
文献类型：
--
作者：
Higler, Ruben;Appel, Jeroen;Sprakel, Joris
我们研究了较大的取代杂质对软微凝胶晶体结构的影响。在我们采用的尺寸比 r（小）/r（大） = 0.67 下，我们观察到大杂质与基础晶体在杂质颗粒含量低的情况下意外地共结晶。单个杂质取代了晶格内 4 个四面体配位的小颗粒。然而，由于这伴随着颗粒的局部变形，这种变形最小化结构在较高比例的大替代杂质下转变为杂质颗粒的随机周围。通过这种转变，晶格中的扭曲变得更长，并最终导致样品玻璃化。
We study the effect of larger substitutional impurities on the structure of soft microgel crystals. At the size ratio we employ, r(small)/r(large) = 0.67, we observe the unexpected co-crystallisation of the large impurities with the base crystal, at low fractions of impurity particles. A single impurity takes the place of 4 tetrahedrally coordinated small particles within the lattice. However, as this is accompanied by local deformations of the particles, this distortion-minimizing structure transforms into a random surrounding of the impurity particle at higher fractions of large substitutional impurities. The distortions in the lattice become longer ranged through this transformation, and ultimately result in vitrification of the sample.