Graphene Oxide Sheets in Solvents: To Crumple or Not To Crumple?
| Autor: | Chong Luo, Jiayan Luo, Andrew R. Koltonow, Jiaxing Huang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
010405 organic chemistry Graphene General Chemical Engineering Oxide Energetic cost 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology 01 natural sciences Article 0104 chemical sciences law.invention lcsh:Chemistry chemistry.chemical_compound Crystallinity chemistry lcsh:QD1-999 law Composite material 0210 nano-technology |
| Zdroj: | ACS Omega, Vol 2, Iss 11, Pp 8005-8009 (2017) ACS Omega |
| ISSN: | 2470-1343 |
| Popis: | Some earlier studies suggested that graphene oxide (GO) sheets adopt a crumpled configuration in water, similar to the shape of a paper ball, which turns into an even more compact, collapsed form upon addition of a poor solvent due to enhanced intrasheet affinity. Although those results have been debated in studies concerning membrane configurations, they are now often used to justify the existence of folds and wrinkles in solution-processed GO-based structures. This has led to a misconception that wrinkled and crumpled features may be intrinsic to solution processing and unavoidable. Here, we connect this problem to experimental observations of the liquid crystallinity of GO dispersions, which clearly show that the sheets are neither crumpled nor collapsed, with or without poor solvent. The sheets can simply fold flat or restack to hide their surfaces from poor solvent, without incurring the energetic cost of severe deformations to crumple. |
| Databáze: | OpenAIRE |
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