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Images captured after each cycle are shown in Figure 4.14 both in solid and liquid phases. Pictures of samples right after preparation (#C=0) were also included. Unlike the GNP-wax (Figure 4.11 – left beaker in each cell) and Al2O3-wax samples (middle beaker in each cell), the stability evaluation for MWCNT-paraffin wax composite was far more distinct thanks to the dark color of the MWCNT (right beaker in each cell). The MWCNT within paraffin were uniformly dispersed and relatively stable after sample preparation in liquid phase (pictures labeled as 0). However, a thin, particle-free region emerged in the second thermal cycle. Later, the MWCNT-paraffin wax sample was subjected to further thermal cycles. As a result, larger particle-free layers formed on the upper portion of the beakers, with the MWCNT settling at the bottom of the container. The gradual deterioration of dispersion is apparent in both liquid and solid phases for MWCNT- paraffin wax samples. It was challenging to assess the stability of Al2O3-wax samples in solid phase due to the similar colors of the wax and nanoparticles. However, it was noticed that the majority of white Al2O nanoparticles precipitated at the bottom of the container, even after the first thermal cycle in liquid phase. Only a small number of nanoparticles were suspended within the wax medium. A closer look at the sample revealed that the fraction of particles suspended in paraffin wax decreased as the Al2O3-wax sample experienced thermal cycles. GNP dispersion in the wax was better compared to MWCNT and Al2O3 nanoparticles. In liquid phase, GNP nanoparticles seemed to maintain their uniform dispersion over thermal cycles. However, when the samples were solidified after each cycle, graphene nanoplatelets were seen to have settled on the bottom of the container. 68PDF Image | THERMAL ENERGY STORAGE USING PARAFFIN WAX
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