Thermally reconfigurable monoclinic nematic colloidal fluids
Abstract
Fundamental relationships are believed to exist between the symmetries of building blocks and the condensed matter phases that they form. For example, constituent molecular and colloidal rods and disks impart their uniaxial symmetry onto nematic liquid crystals, such as those used in displays. Low-symmetry organizations could form in mixtures of rods and disks, but entropy tends to phase-separate them at the molecular and colloidal scales, whereas strong elasticity-mediated interactions drive the formation of chains and crystals in nematic colloids. To have a structure with few or no symmetry operations apart from trivial ones has so far been demonstrated to be a property of solids alone, but not of their fully fluid condensed matter counterparts, even though such symmetries have been considered theoretically and observed in magnetic colloids. In this work, we show that dispersing highly anisotropic charged colloidal disks in a nematic host composed of molecular rods provides a platform for observing many low-symmetry phases. Depending on the temperature, concentration and surface charge of the disks, we find nematic, smectic and columnar organizations with symmetries ranging from uniaxial to orthorhombic and monoclinic. With increasing temperature, we observe unusual transitions from less- to more-ordered states and re-entrant phases. Most importantly, wemore »
- Authors:
-
- Univ. of Colorado, Boulder, CO (United States)
- Univ. Paris-Saclay, Orsay (France)
- Univ. of Colorado, Boulder, CO (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Publication Date:
- Research Org.:
- Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1764614
- Grant/Contract Number:
- SC0019293
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature (London)
- Additional Journal Information:
- Journal Name: Nature (London); Journal Volume: 590; Journal Issue: 7845; Journal ID: ISSN 0028-0836
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; symmetry; colloid; phase behavior; monoclinic order; colloids; liquid crystals; molecular self-assembly; nanoparticles; phase transitions and critical phenomena
Citation Formats
Mundoor, Haridas, Wu, Jin-Sheng, Wensink, Henricus H., and Smalyukh, Ivan I. Thermally reconfigurable monoclinic nematic colloidal fluids. United States: N. p., 2021.
Web. doi:10.1038/s41586-021-03249-0.
Mundoor, Haridas, Wu, Jin-Sheng, Wensink, Henricus H., & Smalyukh, Ivan I. Thermally reconfigurable monoclinic nematic colloidal fluids. United States. https://doi.org/10.1038/s41586-021-03249-0
Mundoor, Haridas, Wu, Jin-Sheng, Wensink, Henricus H., and Smalyukh, Ivan I. Wed .
"Thermally reconfigurable monoclinic nematic colloidal fluids". United States. https://doi.org/10.1038/s41586-021-03249-0. https://www.osti.gov/servlets/purl/1764614.
@article{osti_1764614,
title = {Thermally reconfigurable monoclinic nematic colloidal fluids},
author = {Mundoor, Haridas and Wu, Jin-Sheng and Wensink, Henricus H. and Smalyukh, Ivan I.},
abstractNote = {Fundamental relationships are believed to exist between the symmetries of building blocks and the condensed matter phases that they form. For example, constituent molecular and colloidal rods and disks impart their uniaxial symmetry onto nematic liquid crystals, such as those used in displays. Low-symmetry organizations could form in mixtures of rods and disks, but entropy tends to phase-separate them at the molecular and colloidal scales, whereas strong elasticity-mediated interactions drive the formation of chains and crystals in nematic colloids. To have a structure with few or no symmetry operations apart from trivial ones has so far been demonstrated to be a property of solids alone, but not of their fully fluid condensed matter counterparts, even though such symmetries have been considered theoretically and observed in magnetic colloids. In this work, we show that dispersing highly anisotropic charged colloidal disks in a nematic host composed of molecular rods provides a platform for observing many low-symmetry phases. Depending on the temperature, concentration and surface charge of the disks, we find nematic, smectic and columnar organizations with symmetries ranging from uniaxial to orthorhombic and monoclinic. With increasing temperature, we observe unusual transitions from less- to more-ordered states and re-entrant phases. Most importantly, we demonstrate the presence of reconfigurable monoclinic colloidal nematic order, as well as the possibility of thermal and magnetic control of low-symmetry self-assembly. Our experimental findings are supported by theoretical modelling of the colloidal interactions between disks in the nematic host and may provide a route towards realizing many low-symmetry condensed matter phases in systems with building blocks of dissimilar shapes and sizes, as well as their technological applications.},
doi = {10.1038/s41586-021-03249-0},
journal = {Nature (London)},
number = 7845,
volume = 590,
place = {United States},
year = {Wed Feb 10 00:00:00 EST 2021},
month = {Wed Feb 10 00:00:00 EST 2021}
}
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