Radiative Cooling Properties of Portlandite and Tobermorite: Two Cementitious Minerals of Great Relevance in Concrete Science and Technology

Dolado, Jorge S.; Goracci, G; Arrese-Igor, Silvia; Ayuela, Andrés; Torres, A.; Liberal, Iñigo; Beruete, Miguel; Gaitero, Juan J.; Cagnoni, Matteo; Cappelluti, Federica

doi:10.1021/acsaom.3c00082

Cited by 5 publications

(2 citation statements)

References 49 publications

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“…To provide context in comparison with other materials used as cool materials, CPS exhibits values lower than TiO 2 (α > 0.17), 39 a metal oxide commonly employed for white coating with high reflectivity. Additionally, the solar absorption value of CPS is comparable to that of Portlandite (α = 0.07), 40 another mineral known for its low solar absorption. In the frequency range within the atmospheric window (light blue area), an almost flat R can be observed, with a small dip at around 11 μm.…”

Section: Resultsmentioning

confidence: 82%

Cool Concrete Incorporating Carbonated Periwinkle Shell: A Sustainable Solution for Mitigating Urban Heat Island Effects

Goracci,

Saeed,

Ogundiran

et al. 2024

ACS Sustainable Chem. Eng.

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The urban heat island effect has become a critical issue in urban areas, intensifying heat-related problems and increasing energy consumption. A sustainable cement formulation that combines ordinary Portland cement (OPC) with a carbonated aggregate derived from Periwinkle shell powder for the development of an efficient cool material is presented. Through a carbonation process, the aggregate undergoes a transformation, capturing carbon dioxide (CO2) and converting it into calcite. The resulting cement mixture exhibits high solar reflective properties, making it a potential candidate for cool pavement and roof applications. In this study, the raw materials, including the Periwinkle shell powder, were characterized, and the carbonation process was evaluated to quantify the CO2 capture efficiency. Additionally, a real test of the efficiency of this new cement on a roof demonstrated that the material achieved a significant cooling effect, being 6 °C cooler than that with standard OPC at the peak of solar radiation.

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Section: Resultsmentioning

confidence: 82%

Cool Concrete Incorporating Carbonated Periwinkle Shell: A Sustainable Solution for Mitigating Urban Heat Island Effects

Goracci,

Saeed,

Ogundiran

et al. 2024

ACS Sustainable Chem. Eng.

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“…Furthermore, the SiS nanotubes show intriguing emission properties in the infrared regime, particularly within the atmospheric window. This makes them appealing for applications requiring radiative cooling or infrared emission [34]. Thus, the versatility of SiS layers and tubes nanomaterials enables their utilization in a wide range of applications, harnessing absorption in the visible range and emission in the infrared atmospheric window.…”

Section: Pmma Sis Nanotubes: Dimerization Effectsmentioning

confidence: 99%

Dimerization Effects and Negative Strain Energy in Silicon Monosulfide Nanotubes

Alonso-Lanza,

Aguilera-Granja,

Ayuela

2023

Nanomaterials

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We report on the construction and characterization of silicon monosulfide nanotubes that were obtained by rolling up two-dimensional materials isoelectronic to phosphorene in the recently discovered layered Pmma and β phases. We relaxed and studied the nanotube structures using computational methods within density functional theory (DFT). We found that the nanotubes with a thick Pmma layer remain stable at room temperature, and their electronic properties depend on their diameters. Small-diameter nanotubes display metallic character, while nanotubes with increasing diameter show semiconducting ground states due to the dimerization in the silicon–silicon distances that opens a gap, leading to interesting optical properties in the near-infrared region. Furthermore, we discovered β SiS monolayer nanotubes having negative strain energies, similar to the well-known imogolite inorganic nanotubes. The combined thermal stability, compelling optical properties, and diverse applications of these silicon monosulfide nanotubes underscore the demand for novel synthesis methods to fully explore their potential in various fields.

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Extended detailed balance modeling toward solar cells with cement‐based radiative coolers

Cagnoni,

Testa,

Dolado

et al. 2023

Progress in Photovoltaics

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Reducing the temperature of a solar cell increases its efficiency and lifetime. This can be achieved by radiative cooling, a passive and simple method relying on materials that dump heat into outer space by thermal emission within the atmosphere transparency window between 8 and . As most radiative coolers are expensive or possibly UV unstable, we have recently proposed cement‐based solutions as a robust and cost‐effective alternative. However, the assessment model used describes the cell in the radiative limit and with perfect thermal coupling to the cooler, in line with the literature. In this work, we lift these two approximations, by incorporating Auger and Shockley–Read–Hall nonradiative recombination and a finite heat transfer coefficient at the cell/cooler interface, to obtain a thermal description of the cell/cooler stack closer to reality, while preserving the universality and transparency of the detailed‐balance approach. We use this model to demonstrate that the cell performance gains provided by a radiative cooler are underestimated in the radiative limit and are hence more prominent in devices with stronger nonradiative recombination. Furthermore, we quantify the relation between cell temperature and heat transfer coefficient at the cell/cooler interface and show how this can be used to define design requirements. The extended model developed, and the resulting observations provide important guidelines toward the practical realization of novel radiative coolers for solar cells, including cement‐based ones.

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Radiative Cooling Properties of Portlandite and Tobermorite: Two Cementitious Minerals of Great Relevance in Concrete Science and Technology

Cited by 5 publications

References 49 publications

Cool Concrete Incorporating Carbonated Periwinkle Shell: A Sustainable Solution for Mitigating Urban Heat Island Effects

Cool Concrete Incorporating Carbonated Periwinkle Shell: A Sustainable Solution for Mitigating Urban Heat Island Effects

Dimerization Effects and Negative Strain Energy in Silicon Monosulfide Nanotubes

Extended detailed balance modeling toward solar cells with cement‐based radiative coolers

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