Evaluation on stability and thermophysical performances of covalently functionalized graphene nanoplatelets with xylitol and citric acid
An economical and environmentally friendly approach has been introduced to synthesize highly stable graphene nanoplatelets (GNPs) dispersions with different solvents e.g. water, ethylene glycol, methanol, ethanol, and 1-hexanol. The strategy involved with the introduction of hydroxyl groups through...
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| Format: | Article |
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Elsevier
2018
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| author | Shazali, Siti Shafiah Rozali, Shaifulazuar Amiri, Ahmad Zubir, Mohd Nashrul Mohd Sabri, Mohd Faizul Mohd Zabri, Mohd Zakuan |
| author_facet | Shazali, Siti Shafiah Rozali, Shaifulazuar Amiri, Ahmad Zubir, Mohd Nashrul Mohd Sabri, Mohd Faizul Mohd Zabri, Mohd Zakuan |
| author_sort | Shazali, Siti Shafiah |
| collection | UM |
| description | An economical and environmentally friendly approach has been introduced to synthesize highly stable graphene nanoplatelets (GNPs) dispersions with different solvents e.g. water, ethylene glycol, methanol, ethanol, and 1-hexanol. The strategy involved with the introduction of hydroxyl groups through mild oxidation of GNPs which was then grafted with citric acid and xylitol that polymerized together, improving the solubility of GNPs. The functionalization of GNPs was proved by Fourier transform infrared (FTIR), Raman spectroscopy and high resolution-transmission electron microscope (HRTEM). Further study was carried out by using xylitol and citric acid (XC)-treated GNPs as an additive in base fluid to check their thermophysical properties. Great stability for water-, methanol-, ethanol-, 1-hexanol- and ethylene glycol-based XC-treated GNPs dispersions at 0.01 wt% was achieved, representing stable weight concentrations of 89%, 75%, 72%, 64% and 82% after 15 days, respectively. In addition, the XC-treated GNPs show remarkable enhancement in the thermal conductivity up to 34% at 60 °C. Furthermore, water-based XC-treated GNPs dispersions with different concentrations show Newtonian behaviour. |
| first_indexed | 2024-03-06T05:51:56Z |
| format | Article |
| id | um.eprints-20685 |
| institution | Universiti Malaya |
| last_indexed | 2024-03-06T05:51:56Z |
| publishDate | 2018 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | um.eprints-206852019-03-13T03:44:48Z http://eprints.um.edu.my/20685/ Evaluation on stability and thermophysical performances of covalently functionalized graphene nanoplatelets with xylitol and citric acid Shazali, Siti Shafiah Rozali, Shaifulazuar Amiri, Ahmad Zubir, Mohd Nashrul Mohd Sabri, Mohd Faizul Mohd Zabri, Mohd Zakuan TJ Mechanical engineering and machinery An economical and environmentally friendly approach has been introduced to synthesize highly stable graphene nanoplatelets (GNPs) dispersions with different solvents e.g. water, ethylene glycol, methanol, ethanol, and 1-hexanol. The strategy involved with the introduction of hydroxyl groups through mild oxidation of GNPs which was then grafted with citric acid and xylitol that polymerized together, improving the solubility of GNPs. The functionalization of GNPs was proved by Fourier transform infrared (FTIR), Raman spectroscopy and high resolution-transmission electron microscope (HRTEM). Further study was carried out by using xylitol and citric acid (XC)-treated GNPs as an additive in base fluid to check their thermophysical properties. Great stability for water-, methanol-, ethanol-, 1-hexanol- and ethylene glycol-based XC-treated GNPs dispersions at 0.01 wt% was achieved, representing stable weight concentrations of 89%, 75%, 72%, 64% and 82% after 15 days, respectively. In addition, the XC-treated GNPs show remarkable enhancement in the thermal conductivity up to 34% at 60 °C. Furthermore, water-based XC-treated GNPs dispersions with different concentrations show Newtonian behaviour. Elsevier 2018 Article PeerReviewed Shazali, Siti Shafiah and Rozali, Shaifulazuar and Amiri, Ahmad and Zubir, Mohd Nashrul Mohd and Sabri, Mohd Faizul Mohd and Zabri, Mohd Zakuan (2018) Evaluation on stability and thermophysical performances of covalently functionalized graphene nanoplatelets with xylitol and citric acid. Materials Chemistry and Physics, 212. pp. 363-371. ISSN 0254-0584, DOI https://doi.org/10.1016/j.matchemphys.2018.03.040 <https://doi.org/10.1016/j.matchemphys.2018.03.040>. https://doi.org/10.1016/j.matchemphys.2018.03.040 doi:10.1016/j.matchemphys.2018.03.040 |
| spellingShingle | TJ Mechanical engineering and machinery Shazali, Siti Shafiah Rozali, Shaifulazuar Amiri, Ahmad Zubir, Mohd Nashrul Mohd Sabri, Mohd Faizul Mohd Zabri, Mohd Zakuan Evaluation on stability and thermophysical performances of covalently functionalized graphene nanoplatelets with xylitol and citric acid |
| title | Evaluation on stability and thermophysical performances of covalently functionalized graphene nanoplatelets with xylitol and citric acid |
| title_full | Evaluation on stability and thermophysical performances of covalently functionalized graphene nanoplatelets with xylitol and citric acid |
| title_fullStr | Evaluation on stability and thermophysical performances of covalently functionalized graphene nanoplatelets with xylitol and citric acid |
| title_full_unstemmed | Evaluation on stability and thermophysical performances of covalently functionalized graphene nanoplatelets with xylitol and citric acid |
| title_short | Evaluation on stability and thermophysical performances of covalently functionalized graphene nanoplatelets with xylitol and citric acid |
| title_sort | evaluation on stability and thermophysical performances of covalently functionalized graphene nanoplatelets with xylitol and citric acid |
| topic | TJ Mechanical engineering and machinery |
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