Shear-induced polydomain structures of nematic lyotropic chromonic liquid crystal disodium cromoglycate
Abstract
Lyotropic chromonic liquid crystals (LCLCs) represent aqueous dispersions of organic disk-like molecules that form cylindrical aggregates. Despite the growing interest in these materials, their flow behavior is poorly understood. Here, we explore the effect of shear on dynamic structures of the nematic LCLC, formed by 14 wt% water dispersion of disodium cromoglycate (DSCG). We employ in situ polarizing optical microscopy (POM) and small-angle and wide-angle X-ray scattering (SAXS/WAXS) to obtain independent and complementary information on the director structures over a wide range of shear rates. The DSCG nematic shows a shear-thinning behavior with two shear-thinning regions (Region I at $$\dot{\gamma}$$ < 1 s-1 and Region III at $$\dot{\gamma}$$ > 10 s-1) separated by a pseudo-Newtonian Region II (1 s-1 < $$\dot{\gamma}$$ < 10 s-1). The material is of a tumbling type. In Region I, $$\dot{\gamma}$$ < 1 s-1, the director realigns along the vorticity axis. An increase of [small gamma, Greek, dot above] above 1 s-1 triggers nucleation of disclination loops. The disclinations introduce patches of the director that deviates from the vorticity direction and form a polydomain texture. Extension of the domains along the flow and along the vorticity direction decreases with the increase of the shear rate to 10 s-1. Above 10 s-1, the domains begin to elongate along the flow. At $$\dot{\gamma}$$ > 100 s-1, the texture evolves into periodic stripes in which the director is predominantly along the flow with left and right tilts. The period of stripes decreases with an increase of $$\dot{\gamma}$$. The shear-induced transformations are explained by the balance of the elastic and viscous energies. In particular, nucleation of disclinations is associated with an increase of the elastic energy at the walls separating nonsingular domains with different director tilts. The uncovered shear-induced structural effects would be of importance in the further development of LCLC applications.
- Authors:
-
[1];
[1];
[1];
[1]
- Kent State Univ., Kent, OH (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1693396
- Alternate Identifier(s):
- OSTI ID: 1647261
- Report Number(s):
- BNL-219999-2020-JAAM
Journal ID: ISSN 1744-683X
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Soft Matter
- Additional Journal Information:
- Journal Volume: 16; Journal Issue: 37; Journal ID: ISSN 1744-683X
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Baza, Hend, Turiv, Taras, Li, Bing-Xiang, Li, Ruipeng, Yavitt, Benjamin M., Fukuto, Masafumi, and Lavrentovich, Oleg D. Shear-induced polydomain structures of nematic lyotropic chromonic liquid crystal disodium cromoglycate. United States: N. p., 2020.
Web. doi:10.1039/d0sm01259a.
Baza, Hend, Turiv, Taras, Li, Bing-Xiang, Li, Ruipeng, Yavitt, Benjamin M., Fukuto, Masafumi, & Lavrentovich, Oleg D. Shear-induced polydomain structures of nematic lyotropic chromonic liquid crystal disodium cromoglycate. United States. https://doi.org/10.1039/d0sm01259a
Baza, Hend, Turiv, Taras, Li, Bing-Xiang, Li, Ruipeng, Yavitt, Benjamin M., Fukuto, Masafumi, and Lavrentovich, Oleg D. Wed .
"Shear-induced polydomain structures of nematic lyotropic chromonic liquid crystal disodium cromoglycate". United States. https://doi.org/10.1039/d0sm01259a. https://www.osti.gov/servlets/purl/1693396.
@article{osti_1693396,
title = {Shear-induced polydomain structures of nematic lyotropic chromonic liquid crystal disodium cromoglycate},
author = {Baza, Hend and Turiv, Taras and Li, Bing-Xiang and Li, Ruipeng and Yavitt, Benjamin M. and Fukuto, Masafumi and Lavrentovich, Oleg D.},
abstractNote = {Lyotropic chromonic liquid crystals (LCLCs) represent aqueous dispersions of organic disk-like molecules that form cylindrical aggregates. Despite the growing interest in these materials, their flow behavior is poorly understood. Here, we explore the effect of shear on dynamic structures of the nematic LCLC, formed by 14 wt% water dispersion of disodium cromoglycate (DSCG). We employ in situ polarizing optical microscopy (POM) and small-angle and wide-angle X-ray scattering (SAXS/WAXS) to obtain independent and complementary information on the director structures over a wide range of shear rates. The DSCG nematic shows a shear-thinning behavior with two shear-thinning regions (Region I at $\dot{\gamma}$ < 1 s-1 and Region III at $\dot{\gamma}$ > 10 s-1) separated by a pseudo-Newtonian Region II (1 s-1 < $\dot{\gamma}$ < 10 s-1). The material is of a tumbling type. In Region I, $\dot{\gamma}$ < 1 s-1, the director realigns along the vorticity axis. An increase of [small gamma, Greek, dot above] above 1 s-1 triggers nucleation of disclination loops. The disclinations introduce patches of the director that deviates from the vorticity direction and form a polydomain texture. Extension of the domains along the flow and along the vorticity direction decreases with the increase of the shear rate to 10 s-1. Above 10 s-1, the domains begin to elongate along the flow. At $\dot{\gamma}$ > 100 s-1, the texture evolves into periodic stripes in which the director is predominantly along the flow with left and right tilts. The period of stripes decreases with an increase of $\dot{\gamma}$. The shear-induced transformations are explained by the balance of the elastic and viscous energies. In particular, nucleation of disclinations is associated with an increase of the elastic energy at the walls separating nonsingular domains with different director tilts. The uncovered shear-induced structural effects would be of importance in the further development of LCLC applications.},
doi = {10.1039/d0sm01259a},
journal = {Soft Matter},
number = 37,
volume = 16,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 2020},
month = {Wed Jan 01 00:00:00 EST 2020}
}
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