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Title: Mesoscale martensitic transformation in single crystals of topological defects

Abstract

Liquid crystal blue phases (BPs) are highly ordered at two levels. Molecules exhibit orientational order at nanometer length scales, while chirality leads to ordered arrays of doubletwisted cylinders over micrometer scales. Past studies of polycrystalline BPs were challenged by grain boundaries between randomly oriented crystalline nanodomains. Here, the nucleation of BPs is controlled with considerable precision by relying on chemically nano-patterned surfaces, leading to macroscopic single-crystal BP specimens where the dynamics of meso-crystal formation can be directly observed. Theory and experiments show that transitions between two BPs having a different network structure proceed through local re-organization of the crystalline array, without diffusion of the double twisted cylinders. In solid crystals, martensitic transformations between crystal structures involve the concerted motion of a few atoms, without diffusion. The transformation between BPs, where crystal features arise in the sub-micron regime, is found to be martensitic in nature, with the diffusion-less feature associated to the collective behavior of the double twist cylinders. Single-crystal BPs are shown to offer fertile grounds for the study of directed crystal-nucleation and the controlled growth of soft matter.

Authors:
ORCiD logo; ; ORCiD logo; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division; University of Chicago - Materials Research Science & Engineering Center (MRSEC)
OSTI Identifier:
1411052
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America; Journal Volume: 114; Journal Issue: 38
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; chemical patterns; blue phase; chiral liquid crystals; martensitic transformation; self-assembly

Citation Formats

Li, Xiao, Martínez-González, José A., Hernández-Ortiz, Juan P., Ramírez-Hernández, Abelardo, Zhou, Ye, Sadati, Monirosadat, Zhang, Rui, Nealey, Paul F., and de Pablo, Juan J.. Mesoscale martensitic transformation in single crystals of topological defects. United States: N. p., 2017. Web. doi:10.1073/pnas.1711207114.
Li, Xiao, Martínez-González, José A., Hernández-Ortiz, Juan P., Ramírez-Hernández, Abelardo, Zhou, Ye, Sadati, Monirosadat, Zhang, Rui, Nealey, Paul F., & de Pablo, Juan J.. Mesoscale martensitic transformation in single crystals of topological defects. United States. doi:10.1073/pnas.1711207114.
Li, Xiao, Martínez-González, José A., Hernández-Ortiz, Juan P., Ramírez-Hernández, Abelardo, Zhou, Ye, Sadati, Monirosadat, Zhang, Rui, Nealey, Paul F., and de Pablo, Juan J.. Tue . "Mesoscale martensitic transformation in single crystals of topological defects". United States. doi:10.1073/pnas.1711207114.
@article{osti_1411052,
title = {Mesoscale martensitic transformation in single crystals of topological defects},
author = {Li, Xiao and Martínez-González, José A. and Hernández-Ortiz, Juan P. and Ramírez-Hernández, Abelardo and Zhou, Ye and Sadati, Monirosadat and Zhang, Rui and Nealey, Paul F. and de Pablo, Juan J.},
abstractNote = {Liquid crystal blue phases (BPs) are highly ordered at two levels. Molecules exhibit orientational order at nanometer length scales, while chirality leads to ordered arrays of doubletwisted cylinders over micrometer scales. Past studies of polycrystalline BPs were challenged by grain boundaries between randomly oriented crystalline nanodomains. Here, the nucleation of BPs is controlled with considerable precision by relying on chemically nano-patterned surfaces, leading to macroscopic single-crystal BP specimens where the dynamics of meso-crystal formation can be directly observed. Theory and experiments show that transitions between two BPs having a different network structure proceed through local re-organization of the crystalline array, without diffusion of the double twisted cylinders. In solid crystals, martensitic transformations between crystal structures involve the concerted motion of a few atoms, without diffusion. The transformation between BPs, where crystal features arise in the sub-micron regime, is found to be martensitic in nature, with the diffusion-less feature associated to the collective behavior of the double twist cylinders. Single-crystal BPs are shown to offer fertile grounds for the study of directed crystal-nucleation and the controlled growth of soft matter.},
doi = {10.1073/pnas.1711207114},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 38,
volume = 114,
place = {United States},
year = {Tue Sep 05 00:00:00 EDT 2017},
month = {Tue Sep 05 00:00:00 EDT 2017}
}