Properties of crystalline and amorphous materials are characterized by the underlying long-range and local crystalline order. Deformations and defects are structural hallmarks of plasticity, ice formation, and crystal growth mechanisms. Partitioning topological networks into constituent crystal building blocks, which is the basis of topological identification criteria, is an intuitive approach for classification in both bulk and confinement. However, techniques reliant on the convex hull for assigning orientations of component units fail for non-convex blocks. Here, we propose a new framework, called Topological Unit Matching (TUM), which exploits information from topological criteria for an efficient shape-matching procedure. TUM is a general family of algorithms, capable of quantifying deformations and unambiguously determining grains of bulk and confined ice polymorphs. We show that TUM significantly improves the identification of quasi-one-dimensional ice by including deformed prism blocks. We demonstrate the efficacy of TUM by analyzing supercooled water nanoparticles, amorphous ice, and phase transitions in an ice nanotube. We also illustrate the superiority of TUM in resolving topological defect structures with minimal parameterization.
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21 April 2021
Research Article|
April 16 2021
A hybrid topological and shape-matching approach for structure analysis
Amrita Goswami
;
Amrita Goswami
Department of Chemical Engineering, Indian Institute of Technology Kanpur
, Kanpur 208016, India
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Jayant K. Singh
Jayant K. Singh
a)
Department of Chemical Engineering, Indian Institute of Technology Kanpur
, Kanpur 208016, India
a)Author to whom correspondence should be addressed: jayantks@iitk.ac.in; Also at:: Prescience Insilico Private Limited, Old Madras Road, Bangalore 560049, India.
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a)Author to whom correspondence should be addressed: jayantks@iitk.ac.in; Also at:: Prescience Insilico Private Limited, Old Madras Road, Bangalore 560049, India.
J. Chem. Phys. 154, 154502 (2021)
Article history
Received:
February 03 2021
Accepted:
March 30 2021
Citation
Amrita Goswami, Jayant K. Singh; A hybrid topological and shape-matching approach for structure analysis. J. Chem. Phys. 21 April 2021; 154 (15): 154502. https://doi.org/10.1063/5.0046419
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