Shazali, Siti Shafiah and Amiri, Ahmad and Zubir, Mohd Nashrul Mohd and Rozali, Shaifulazuar and Zabri, Mohd Zakuan and Sabri, Mohd Faizul Mohd and Soleymaniha, Mohammadreza (2018) Investigation of the thermophysical properties and stability performance of non-covalently functionalized graphene nanoplatelets with Pluronic P-123 in different solvents. Materials Chemistry and Physics, 206. pp. 94-102. ISSN 0254-0584, DOI https://doi.org/10.1016/j.matchemphys.2017.12.008.
Full text not available from this repository.Abstract
The employment of nanofluids involving the dispersion of nanomaterials in the base fluid has become a major interest of the researchers due to great potential in enhancing the thermophysical properties and heat transfer coefficients. The stability of nanoparticles in base fluids is a major concern with heat transfer applications. The main purpose of this research was to study the stability of graphene nanoplatelets (GNPs) in the presence of Pluronic P-123 surfactant (P-123) in aqueous media and to compare with other common surfactants such as sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB) and Triton X-100 (TX). Each of the surfactants was mixed with GNPs at different ratios of 1:1, 1:2, 1:3 and 1:4. Then, the best ratio with the most stable sample was selected and compared with other samples. The stability of samples was evaluated by using UV-vis spectrometry, zeta potential and particle size distribution. The viscosity and thermal conductivity of the best sample were also measured at different temperatures. High resolution-transmission Electron Microscopy (HR-TEM) was used to characterize the morphology of GNPs. Interestingly, P-123 as a new surfactant showed the best colloidal stability between our samples. Furthermore, the presence of SDS, CTAB and TX surfactants in the nanofluids caused the formation of excessive foam, while P123-GNPs showed no foam-formation after shaking within the given time. It is worthy to highlight that the rises in thermal conductivity and stability in the presence of P-123 were higher than those of other surfactants. Also, the addition of rheological property (viscosity) was found to be insignificant once loading P-123.
| Item Type: | Article |
|---|---|
| Funders: | University of Malaya (Project no.: BK009-2016 & PG029-2015A) |
| Uncontrolled Keywords: | Graphene; Surfactant; Non-covalent; Dispersible; Functionalization |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Faculty of Engineering |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 13 Mar 2019 03:56 |
| Last Modified: | 13 Mar 2019 03:56 |
| URI: | http://eprints.um.edu.my/id/eprint/20687 |
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