Favored local structures in amorphous colloidal packings measured by microbeam X-ray diffraction

Liu Amelia C. Y.; Tabor Rico F.; de Jonge Martin D.Mudie Stephen T.Petersen Timothy C.

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Favored local structures in amorphous colloidal packings measured by microbeam X-ray diffraction

机译：Favored local structures in amorphous colloidal packings measured by microbeam X-ray diffraction

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Local structure and symmetry are keys to understanding how a material is formed and the properties it subsequently exhibits. This applies to both crystals and amorphous and glassy materials. In the case of amorphous materials, strong links between processing and history, structure and properties have yet to be made because measuring amorphous structure remains a significant challenge. Here, we demonstrate a method to quantify proportions of the bond-orientational order of nearest neighbor clusters Steinhardt, et al. (1983) Phys Rev B 28: 784-805 in colloidal packings by statistically analyzing the angular correlations in an ensemble of scanning transmission microbeam small-angle X-ray scattering (mu SAXS) patterns. We show that local order can be modulated by tuning the potential between monodisperse, spherical colloidal silica particles using salt and surfactant additives and that more pronounced order is obtained by centrifugation than sedimentation. The order in the centrifuged glasses reflects the ground state order in the dispersion at lower packing fractions. This diffraction-based method can be applied to amorphous systems across decades in length scale to connect structure to behavior in disordered systems with a range of particle interactions.

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《Proceedings of the National Academy of Sciences of the United States of America.》 |2017年第39期|10344-10349|共6页
作者
Liu Amelia C. Y.; Tabor Rico F.; de Jonge Martin D.Mudie Stephen T.Petersen Timothy C.;
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作者单位

Monash Univ, Monash Ctr Electron Microscopy, Clayton, Vic 3800, Australia;

Monash Univ, Sch Chem, Clayton, Vic 3800, Australia;

Australian Synchrotron, Clayton, Vic 3168, AustraliaMonash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
colloid; X-ray diffraction; short-range order; speckle pattern;

Favored local structures in amorphous colloidal packings measured by microbeam X-ray diffraction

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