Shear Rheology Control of Wrinkles and Patterns in Graphene Oxide Films

Langmuir : the ACS Journal of Surfaces and Colloids
Franco TardaniPhilippe Poulin

Abstract

Drying graphene oxide (GO) films are subject to extensive wrinkling, which largely affects their final properties. Wrinkles were shown to be suitable in biotechnological applications; however, they negatively affect the electronic properties of the films. Here, we report on wrinkle tuning and patterning of GO films under stress-controlled conditions during drying. GO flakes assemble at an air-solvent interface; the assembly forms a skin at the surface and may bend due to volume shrinkage while drying. We applied a modification of evaporative lithography to spatially define the evaporative stress field. Wrinkle alignment is achieved over cm2 areas. The wavelength (i.e., wrinkle spacing) is controlled in the μm range by the film thickness and GO concentration. Furthermore, we propose the use of nanoparticles to control capillary forces to suppress wrinkling. An example of a controlled pattern is given to elucidate the potential of the technique. The results are discussed in terms of classical elasticity theory. Wrinkling is the result of bending of the wet solid skin layer assembled on a highly elastic GO dispersion. Wavelength selection is the result of energy minimization between the bending of the skin and the elastic deformat...Continue Reading

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Citations

May 13, 2021·Soft Matter·Kevin S SilmoreJames W Swan
Mar 24, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Felipe L PaivaShaghayegh Khani
Jan 6, 2022·Soft Matter·Kevin S SilmoreJames W Swan

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