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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lee, Hyang Moo Cheong, In Woo Perumal, Suguna |
| Description | Country affiliation: South Korea Author Affiliation: Perumal S ( Department of Applied Chemistry, Kyungpook National University, Buk-gu, Daehak-ro 80, Daegu 41566, South Korea.); Lee HM ( Department of Applied Chemistry, Kyungpook National University, Buk-gu, Daehak-ro 80, Daegu 41566, South Korea.); Cheong IW ( Department of Applied Chemistry, Kyungpook National University, Buk-gu, Daehak-ro 80, Daegu 41566, South Korea. Electronic address: inwoo@knu.ac.kr.) |
| 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. |
| ISSN | 00219797 |
| Journal | Journal of Colloid and Interface Science |
| Volume Number | 497 |
| e-ISSN | 10957103 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2017-03-06 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Colloid & Interface Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Colloid and Surface Chemistry Biomaterials Electronic, Optical and Magnetic Materials |
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