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Status: 
| Verfasst von: | Tan, Huijun |
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| | Navik, Rahul |
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| | Liu, Zhiyuan |
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| | Xiang, Qixuan |
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| | Zhao, Yaping |
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| Titel: | Scalable massive production of defect-free few-layer graphene by ball-milling in series with shearing exfoliation in supercritical CO2 |
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| Verlag: | Elsevier B.V |
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| Jahr: | 2022 |
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| Inhalt: | It is highly desirable to develop industrially scalable methods to produce defect-free graphene to meet the requirement of graphene from lab to commercial applications. In this paper, a ball-milling in series with a shear-mixing exfoliation technique in supercritical CO2 was developed. Graphite was pretreated by ball-milling in supercritical CO2, and the exfoliated sheets with smaller lateral sizes and numerous crevices on their edges were elutriated into a shear-mixing vessel by supercritical CO2 simultaneously to inhibit over crushing. Whereafter, the freshly exfoliated sheets with crevices were further exfoliated into few-layer graphene without aggregation. 90% of the obtained graphene was less than five layers, and the processing capacity of 40 g for one batch increased 40–100 times compared with the previously reported method. The electrical conductivity of 3.25 × 105 S/m of the flexible graphene film on PVDF substrate demonstrates the excellent electrical performance of the obtained graphene.
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•Continuous graphene exfoliation system via ball-milling and shear-mixing in SC-CO2.•SC-CO2 ball-milling pretreatment producing numerous crevices on graphite edges.•CO2 elutriation separation inhibits over crushing and promoting exfoliation.•High-quality graphene was produced continuously with a single batch output of 40 g.•Obtained graphene showed excellent electrical conductivity of 3.25 × 105 S/m. |
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| ISSN: | 0896-8446 |
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| Titel Quelle: | The Journal of supercritical fluids |
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| Jahr Quelle: | 2022 |
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| Band/Heft Quelle: | 181, S. 105496 |
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| DOI: | doi:10.1016/j.supflu.2021.105496 |
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| URL: | http://www.ub.uni-heidelberg.de/cgi-bin/edok?dok=https%3A%2F%2Ffanyv88.com%3A443%2Fhttps%2Fdx.doi.org%2F10.1016%2Fj.supflu.2021.105496 |
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| | DOI: https://doi.org/10.1016/j.supflu.2021.105496 |
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| Sprache: | English |
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| Sach-SW: | Exfoliation |
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| | Graphene |
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| | Supercritical CO2 ball-milling |
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| | Supercritical CO2 elutriation |
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| | Supercritical CO2 shear-mixing |
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| Verknüpfungen: | → Sammelwerk |
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