Back to Search
Start Over
High-concentration graphene dispersion stabilized by block copolymers in ethanol
- Source :
- Journal of Colloid and Interface Science. 497:359-367
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- This article describes a comprehensive study for the preparation of graphene dispersions by liquid-phase exfoliation using amphiphilic diblock copolymers; poly(ethylene oxide)-block-poly(styrene) (PEO-b-PS), poly(ethylene oxide)-block-poly(4-vinylpyridine) (PEO-b-PVP), and poly(ethylene oxide)-block-poly(pyrenemethyl methacrylate) (PEO-b-PPy) with similar block lengths. Block copolymers were prepared from PEO using the Steglich coupling reaction followed by reversible addition-fragmentation chain transfer (RAFT) polymerization. Graphite platelets (G) and reduced graphene oxide (rGO) were used as graphene sources. The dispersion stability of graphene in ethanol was comparatively investigated by on-line turbidity, and the graphene concentration in the dispersions was determined gravimetrically. Our results revealed that the graphene dispersions with PEO-b-PVP were much more stable and included graphene with fewer defects than that with PEO-b-PS or PEO-b-PPy, as confirmed by turbidity and Raman analyses. Gravimetry confirmed that graphene concentrations up to 1.7 and 1.8mg/mL could be obtained from G and rGO dispersions, respectively, using PEO-b-PVP after one week. Distinctions in adhesion forces of PS, VP, PPy block units with graphene surface and the variation in solubility of the block copolymers in ethanol medium significantly affected the stability of the graphene dispersion.
- Subjects :
- Materials science
Oxide
macromolecular substances
02 engineering and technology
010402 general chemistry
01 natural sciences
Styrene
law.invention
Biomaterials
chemistry.chemical_compound
Colloid and Surface Chemistry
law
Polymer chemistry
Copolymer
Ethylene oxide
Graphene
technology, industry, and agriculture
021001 nanoscience & nanotechnology
Exfoliation joint
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry
Chemical engineering
Polymerization
Dispersion stability
0210 nano-technology
Subjects
Details
- ISSN :
- 00219797
- Volume :
- 497
- Database :
- OpenAIRE
- Journal :
- Journal of Colloid and Interface Science
- Accession number :
- edsair.doi.dedup.....40f8cd30c2db93aab74fc306f9969e66