Fadwa Sameeha, Ismail and Kamal, Yusoh and Anis Sakinah, Zainal Abidin and Abu Hannifa, Abdullah and Zulhelmi, Ismail (2019) Three different types of tea as surfactant in liquid exfoliation of graphite : Green tea, black tea and oolong tea. In: IOP Conference Series: Materials Science and Engineering; 1st Process Systems Engineering and Safety Symposium 2019, ProSES 2019 , 4 September 2019 , Kuantan, Pahang, Malaysia. pp. 1-9., 702 (1). ISSN 1757-8981
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Abstract
Liquid phase exfoliation (LPE) with surfactant-assisted is a method to produce graphene that used water and surfactant as solvent. Tea is one of possible surfactants that can be used in LPE of graphite as it reduced the surface tension energy of water (72.75 mJ m-2) to ∼40-50 mJ m-2 which is suitable level to exfoliate graphite. Three different types of tea were used as surfactant through one-step production of graphene which were green tea (GT), black tea (BT) and oolong tea (OT). The exfoliation of graphite in each tea solutions were successful as the UV spectra of supernatant samples show peak at 270 nm which indicates the C-C bond of graphene flakes. Morphology analysis (AFM) of resulted graphene samples show that graphene sheets have sharp edges caused by sonication process. The effect of sonication time was being investigated in this work. Green tea has higher exponent factor of time (1.715) compare to black tea (1.033) and oolong tea (0.762) due to high quantity of small molecules of polyphenols present in green tea solution. Thus, it is better to used GT as surfactant in LPE of graphite compare to BT and OT.
| Item Type: | Conference or Workshop Item (Lecture) |
|---|---|
| Additional Information: | Indexed by Scopus |
| Uncontrolled Keywords: | Graphene sheets; Liquid exfoliations; Liquid Phase; Morphology analysis; Small molecules; Sonication time; Surfactant assisted; Tea solution |
| Subjects: | T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology T Technology > TS Manufactures |
| Faculty/Division: | Institute of Postgraduate Studies Faculty of Chemical and Process Engineering Technology Faculty of Manufacturing and Mechatronic Engineering Technology |
| Depositing User: | Mr Muhamad Firdaus Janih@Jaini |
| Date Deposited: | 17 May 2023 06:46 |
| Last Modified: | 17 May 2023 06:46 |
| URI: | http://umpir.ump.edu.my/id/eprint/35834 |
| Download Statistic: | View Download Statistics |
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