Graphene oxide liquid crystal domains

quantification and role in tailoring viscoelastic behavior

Md Joynul Abedin, Tanesh D. Gamot, Samuel T. Martin, Muthana Ali, Kazi Imdadul Hassan, Meysam Sharifzadeh Mirshekarloo, Rico F. Tabor, Micah J. Green, Mainak Majumder

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Graphene oxide liquid crystals (GOLCs) were exfoliated in a wide variety of solvents (water, ethylene glycol (EG), N-methyl-2-pyrrolidone (NMP), and dimethylformamide (DMF)) by high-speed shearing of graphite oxide. Quantitative polarized light imaging of the equilibrium nematic phases of the lyotropic GOLCs gives insights into the extent of aggregation and quantifiable textural features such as domain size, d. Large nematic domains >100 μm with a high overall degree of order were obtained in water and ethylene glycol, in contrast to 5-50 μm domains in NMP and DMF at comparable volume fractions. Comprehensive rheological studies of these GOLCs indicate that larger domains correlate with higher viscosity and higher elasticity, and scaling analysis shows a power-law dependence of the Ericksen number (Er) with domain size (Er α d3.09). The improved understanding of the relationship between the microstructure and flow properties of GOLCs leads us to an approach of mixed solvent-based GOLCs as a means to tune viscoelastic properties. We demonstrate this approach for the formation of shear-aligned GOLC films for advanced flexible electronic applications such as all-carbon conductive films and thermal heaters.

Original languageEnglish
Number of pages13
JournalACS Nano
DOIs
Publication statusAccepted/In press - 25 Jul 2019

Keywords

  • coating
  • graphene oxide
  • isotropic
  • liquid crystal domain
  • nematic
  • viscoelasticity

Cite this

@article{07d5fd78655247c99d8ed6bd62bea445,
title = "Graphene oxide liquid crystal domains: quantification and role in tailoring viscoelastic behavior",
abstract = "Graphene oxide liquid crystals (GOLCs) were exfoliated in a wide variety of solvents (water, ethylene glycol (EG), N-methyl-2-pyrrolidone (NMP), and dimethylformamide (DMF)) by high-speed shearing of graphite oxide. Quantitative polarized light imaging of the equilibrium nematic phases of the lyotropic GOLCs gives insights into the extent of aggregation and quantifiable textural features such as domain size, d. Large nematic domains >100 μm with a high overall degree of order were obtained in water and ethylene glycol, in contrast to 5-50 μm domains in NMP and DMF at comparable volume fractions. Comprehensive rheological studies of these GOLCs indicate that larger domains correlate with higher viscosity and higher elasticity, and scaling analysis shows a power-law dependence of the Ericksen number (Er) with domain size (Er α d3.09). The improved understanding of the relationship between the microstructure and flow properties of GOLCs leads us to an approach of mixed solvent-based GOLCs as a means to tune viscoelastic properties. We demonstrate this approach for the formation of shear-aligned GOLC films for advanced flexible electronic applications such as all-carbon conductive films and thermal heaters.",
keywords = "coating, graphene oxide, isotropic, liquid crystal domain, nematic, viscoelasticity",
author = "Abedin, {Md Joynul} and Gamot, {Tanesh D.} and Martin, {Samuel T.} and Muthana Ali and Hassan, {Kazi Imdadul} and Mirshekarloo, {Meysam Sharifzadeh} and Tabor, {Rico F.} and Green, {Micah J.} and Mainak Majumder",
year = "2019",
month = "7",
day = "25",
doi = "10.1021/acsnano.9b02830",
language = "English",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society (ACS)",

}

Graphene oxide liquid crystal domains : quantification and role in tailoring viscoelastic behavior. / Abedin, Md Joynul; Gamot, Tanesh D.; Martin, Samuel T.; Ali, Muthana; Hassan, Kazi Imdadul; Mirshekarloo, Meysam Sharifzadeh; Tabor, Rico F.; Green, Micah J.; Majumder, Mainak.

In: ACS Nano, 25.07.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Graphene oxide liquid crystal domains

T2 - quantification and role in tailoring viscoelastic behavior

AU - Abedin, Md Joynul

AU - Gamot, Tanesh D.

AU - Martin, Samuel T.

AU - Ali, Muthana

AU - Hassan, Kazi Imdadul

AU - Mirshekarloo, Meysam Sharifzadeh

AU - Tabor, Rico F.

AU - Green, Micah J.

AU - Majumder, Mainak

PY - 2019/7/25

Y1 - 2019/7/25

N2 - Graphene oxide liquid crystals (GOLCs) were exfoliated in a wide variety of solvents (water, ethylene glycol (EG), N-methyl-2-pyrrolidone (NMP), and dimethylformamide (DMF)) by high-speed shearing of graphite oxide. Quantitative polarized light imaging of the equilibrium nematic phases of the lyotropic GOLCs gives insights into the extent of aggregation and quantifiable textural features such as domain size, d. Large nematic domains >100 μm with a high overall degree of order were obtained in water and ethylene glycol, in contrast to 5-50 μm domains in NMP and DMF at comparable volume fractions. Comprehensive rheological studies of these GOLCs indicate that larger domains correlate with higher viscosity and higher elasticity, and scaling analysis shows a power-law dependence of the Ericksen number (Er) with domain size (Er α d3.09). The improved understanding of the relationship between the microstructure and flow properties of GOLCs leads us to an approach of mixed solvent-based GOLCs as a means to tune viscoelastic properties. We demonstrate this approach for the formation of shear-aligned GOLC films for advanced flexible electronic applications such as all-carbon conductive films and thermal heaters.

AB - Graphene oxide liquid crystals (GOLCs) were exfoliated in a wide variety of solvents (water, ethylene glycol (EG), N-methyl-2-pyrrolidone (NMP), and dimethylformamide (DMF)) by high-speed shearing of graphite oxide. Quantitative polarized light imaging of the equilibrium nematic phases of the lyotropic GOLCs gives insights into the extent of aggregation and quantifiable textural features such as domain size, d. Large nematic domains >100 μm with a high overall degree of order were obtained in water and ethylene glycol, in contrast to 5-50 μm domains in NMP and DMF at comparable volume fractions. Comprehensive rheological studies of these GOLCs indicate that larger domains correlate with higher viscosity and higher elasticity, and scaling analysis shows a power-law dependence of the Ericksen number (Er) with domain size (Er α d3.09). The improved understanding of the relationship between the microstructure and flow properties of GOLCs leads us to an approach of mixed solvent-based GOLCs as a means to tune viscoelastic properties. We demonstrate this approach for the formation of shear-aligned GOLC films for advanced flexible electronic applications such as all-carbon conductive films and thermal heaters.

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