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Dynamic dispersion stability of graphene oxide with metal ions
- Source :
- Chinese Chemical Letters. 31:1625-1629
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Graphene oxide (GO), an important chemical precursor of graphene, can stably disperse in aqueous surrounding and undergo aggregation as metal cations introduced. The usual instability of GO with ions is caused by the shielding effect of ions and crosslinking between GO and ions. However, the dynamic stability of GO under ions exchange still remains unclear. Here, we investigated the dynamic dispersion stability of GO with metal ions and observed a redispersion behavior in concentrated Fe3+ solution, other than permanent aggregation. The exchange with Fe3+ ions drives the reversion of Zeta (ΞΆ) potential and enables the redispersion to individual GO-Fe3+ complex sheets, following a dynamic electric double layer (EDL) mechanism. It is found that the specifically strong electrostatic shielding effect and coordination attraction between Fe3+ and functional oxygen groups allows the selective redispersion of GO in concentrated Fe3+ solution. The revealed dynamic dispersion stability complements our understanding on the dispersive stability of GO and can be utilized to fabricate graphene-metal hybrids for rich applications.
- Subjects :
- Aqueous solution
Materials science
Graphene
Metal ions in aqueous solution
Oxide
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
law.invention
Ion
Metal
chemistry.chemical_compound
chemistry
Chemical engineering
law
visual_art
Dispersion stability
visual_art.visual_art_medium
Shielding effect
0210 nano-technology
Subjects
Details
- ISSN :
- 10018417
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- Chinese Chemical Letters
- Accession number :
- edsair.doi...........b0fb7d9aa368126dc62e96de4df7c6e4