تقرير
X-ray linear dichroic ptychography
| العنوان: | X-ray linear dichroic ptychography |
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| المؤلفون: | Lo, Yuan Hung, Zhou, Jihan, Rana, Arjun, Morrill, Drew, Gentry, Christian, Enders, Bjoern, Yu, Young-Sang, Sun, Chang-Yu, Shapiro, David, Falcone, Roger, Kapteyn, Henry, Murnane, Margaret, Gilbert, Pupa U. P. A., Miao, Jianwei |
| سنة النشر: | 2020 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Physics - Applied Physics, Condensed Matter - Materials Science, Condensed Matter - Soft Condensed Matter |
| الوصف: | Biominerals such as seashells, corals skeletons, bone, and enamel are optically anisotropic crystalline materials with unique nano- and micro-scale organization that translates into exceptional macroscopic mechanical properties, providing inspiration for engineering new and superior biomimetic structures. Here we use particles of Seriatopora aculeata coral skeleton as a model and demonstrate, for the first time, x-ray linear dichroic ptychography. We map the aragonite (CaCO3) crystal c-axis orientations in coral skeleton with 35 nm spatial resolution. Linear dichroic phase imaging at the O K-edge energy shows strong polarization-dependent contrast and reveals the presence of both narrow (< 35{\deg}) and wide (> 35{\deg}) c-axis angular spread in sub-micrometer coral particles. These x-ray ptychography results were corroborated using 4D scanning transmission electron nano-diffraction on the same particles. Evidence of co-oriented but disconnected corallite sub-domains indicates jagged crystal boundaries consistent with formation by amorphous nanoparticle attachment. Looking forward, we anticipate that x-ray linear dichroic ptychography can be applied to study nano-crystallites, interfaces, nucleation and mineral growth of optically anisotropic materials with sub-ten nanometers spatial resolution in three dimensions. |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1073/pnas.2019068118 |
| URL الوصول: | http://arxiv.org/abs/2009.01093 |
| رقم الأكسشن: | edsarx.2009.01093 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1073/pnas.2019068118 |
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