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Materials 2022, 15, 2946 identified the inversion of quartz as it transitioned from α-quartz to β-quartz due to the high SiO2 content in these samples [47]. The results show that the cp values of the “as received” samples dropped after aging, and matched the cp of the pure silica given in [48]. These differences may be attributed to the impurity contents or inhomogeneous compo- sition of the phases in the particles. Hence, even after the aging treatment and proof via the EDX and XRD analyses that the white sand and red sand became almost all silica, we cannot regard them as pure SiO2 with a homogeneous quartz phase. 16 of 20 Materials 2022, 15, x FOR PEER REVIEW Materials 2022, 15, x FOR PEER REVIEW Figure 9. Specific heat measurements of the white sand sample. 19 of 23 19 of 23 Figure 10. Specific heat measurements of the red sand sample. 4.4. Density The theoretical density results for the distilled water are plotted in Error! Reference source not found.. The bulk density and particle density are summarized in Error! Refer- ence source not found.. The results show an increase in both the densities. The highest increase was observed in the red sand after cyclic heating at 1200 °C for 500 h. The density oFifgtuhre 1C0P. Sdpecirfiecahseadt maeftaesrur5e0m0enhtsfroofmthewrehdastaintdwsamspalfet.er 32 h of cyclic heating. Figure 10. Specific heat measurements of the red sand sample. 4.4. Density The theoretical density results for the distilled water are plotted in Error! Reference source not found.. The bulk density and particle density are summarized in Error! Refer- ence source not found.. The results show an increase in both the densities. The highest increase was observed in the red sand after cyclic heating at 1200 °C for 500 h. The density of the CP decreased after 500 h from what it was after 32 h of cyclic heating. FFigiguurere111. .DDeennssitiytymeeaasusureremmeenntstsoof fththeeddisitsitlilleldedwwataetrerwwitihthtetmemppereartauturer.e. Table 7. Bulk density and particle density (kg/m3) for particulate materials “as received” and after each thermal treatment. Material Bulk Density Particle Density As Received 800 °CF—igu6rhe 11.1D00e0ns°iCty—m6ehasu1r2e0m0e°nCts—of5t0h0ehdisAtislleRdecweaitveerdwit8h0t0em°Cp—era6tuhre.1000 °C—6 h 1200 °C—500 hPDF Image | Low-Cost Particulates Used as Energy Storage and Heat-Transfer Medium
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