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Avid, Arezoo
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Publications (4/4 displayed)
- 2023(Keynote) Insight into Carbon Corrosion of Different Carbon Supports for Pt-Based Electrocatalysts for Polymer Electrolyte Fuel Cells from Interfacial Perspective
- 2023(Keynote) Insight into Carbon Corrosion of Different Carbon Supports for Pt-Based Electrocatalysts for Polymer Electrolyte Fuel Cells from Interfacial Perspective
- 2020Evolution of Ionomer Coverage during Accelerated Stress Tests in Polymer Electrolyte Fuel Cells
- 2020Surface modification of MWCNT and its influence on properties of paraffin/MWCNT nanocomposites as phase change materialcitations
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article
Surface modification of MWCNT and its influence on properties of paraffin/MWCNT nanocomposites as phase change material
Abstract
Multiwalled carbon nanotubes (MWCNTs) were modified by an organo-silane in order to improve their dispersion state and stability in paraffin wax. A family of paraffin-based phase change material (PCM) composites filled with MWCNTs was prepared with different loadings (0, 0.1, 0.5, and 1 wt%) of pristine MWCNTs and organo-silane modified MWCNTs (Si-MWCNT). Structural analyses were performed by means of Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and rheological studies using temperature sweeps. Moreover, phase change transition temperatures and heat of fusion as well as thermal and electrical conductivities of the developed PCM nanocomposites were determined. The SEM micrographs and FTIR absorption bands appearing at approximately 1038 and 1112 cm−1 confirmed the silane modification. Differential scanning calorimetery (DSC) results indicate that the presence of Si-MWCNTs leads to slightly favorable enhancement in the energy storage capacity at the maximum loading. It was also shown that the thermal conductivity of the PCM nanocomposites, in both solid and liquid phases, increased with increasing the MWCNT content independent of the kind of MWCNTs by up to about 30% at the maximum loading of MWCNTs. In addition, the modification of MWCNTs made the samples completely electrically nonconductive, and the electrical surface resistivity of the PCMs containing pristine MWCNTs decreased with increasing MWCNTs loading. Furthermore, the rheological assessment under consecutive cyclic phase change demonstrated that the samples containing modified MWCNTs are more stable compared to the PCM containing pristine MWCNTs. © 2019 Wiley ; acceptedVersion