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Local ordering of dimethylformamide around graphene oxide
Martin Charles Wilding1, Tom Headen2, Adam Clancy3
1UK Catalysis Hub/Research Complex at Harwell, Cardiff University, Chilton, UK.
Summary
Neutron and X-ray scattering reveal solvent ordering around graphene oxide (GO) nanosheets. Dimethylformamide (DMF) molecules orient with oxygen atoms closest to the GO surface, indicating a slight positive surface charge.
Area of Science:
- Materials Science
- Physical Chemistry
- Surface Science
Background:
- Graphene oxide (GO) is a crucial material in various applications.
- Understanding solvent interactions with GO nanosheets is vital for optimizing its use.
- Dimethylformamide (DMF) is a common polar solvent with significant industrial applications.
Purpose of the Study:
- To investigate the structural ordering of dimethylformamide (DMF) solvent around graphene oxide (GO) nanosheets.
- To model the interaction between GO surfaces and DMF molecules using empirical potential structural refinement (EPSR).
- To determine the extent of solvent structural changes near the GO surface.
Main Methods:
- Neutron scattering with isotopic substitution.
- High-energy X-ray scattering.
- Empirical Potential Structural Refinement (EPSR) modeling.
Main Results:
- Scattering patterns showed significant structural differences between GO solutions and pure solvent.
- Solvent structure changes were observed up to 10 Å from the GO surface.
- EPSR modeling indicated DMF oxygen atoms are closest to the GO surface, suggesting a positive surface charge.
Conclusions:
- The arrangement of functional groups on the GO surface does not significantly influence solvent ordering.
- Solvent ordering around GO nanosheets is driven by interactions with the surface.
- The findings suggest a small positive charge on the graphene oxide surface.
