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February 21, 2026Applied Thermal EngineeringOpen Access

Development of novel high-absorptivity darkened sands for high-temperature solar thermal applications

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Authors

LCL.M. Cerutti-CristaldoMDM. Díaz-HerasJPJ.C. Pérez-Flores

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Overview

Novel method improves solar absorptivity in silica sand for high-temperature applications, suggesting efficiency gains.

Key Points

  • The aim is to enhance the solar absorptivity of silica sand for high-temperature solar applications through Mn ion diffusion.
  • Synthesized darkened sand by mixing silica sand with manganese carbonate and thermally treating.
  • Analyzed the material using XRD, SEM, and EDS to confirm Mn-ion diffusion and properties.
  • Tested performance in a solar-particle receiver under irradiated conditions.
  • Achieved peak charging efficiencies of 0.59-0.61, matching high-cost materials like SiC.
  • Improved absorptivity reduced solar flux requirements by 40%-60% for a system at 1000K.
  • Demonstrated a 20%-24% efficiency improvement over untreated sand while maintaining structural integrity.

Cite This Study

Cerutti-Cristaldo et al. (2026) studied this question.

synapsesocial.com/papers/69994bdd873532290d01fe31https://doi.org/10.1016/j.applthermaleng.2026.130303
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