Journal
LANGMUIR
Volume 30, Issue 48, Pages 14631-14637Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la503670e
Keywords
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Funding
- Extramural Funding Initiative of Cal Poly
- Frost Research Fellowship of Cal Poly
- National Science Foundation [CMMI-1345138]
- American Chemical Society-Petroleum Research Fund [53970-UR7]
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We report on a series of experiments on large-area ordered patterns of graphene oxide on solid substrates deposited from aqueous dispersions by directed drop evaporation. The aqueous dispersion of graphene oxide exhibits phase transitions from isotropic to liquid crystalline nematic phases via a biphasic region with increasing concentration. In the single nematic phase, schlieren textures accompanied by oriented bands are frequent. Drying of drops in each phase results in deposition covering the whole drop base. The dynamic process of drop drying is analyzed based on the weight loss, radius change, and texture change over time. It is found that the radial bands develop in the nematic drops in the vicinity of the receding of the contact line and subsequently transform into birefringent stripes after drying. Study into the structure and morphology of the stripes reveals anisotropic wrinkling of graphene oxide sheets. The nature of stripe orientation is strongly dependent on the local nematic order at the dewetting water front. Various macroscopic patterns with different stripe orientations including radial spokes, spider webs, and parallel stripes have been generated by tuning the nematic order of drops.
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