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    Repeated disordered structure for radiative cooling application via scalable stamping method from designed CaCO3 templates
    (2026-07-01)
    Kaewmanee, Taweesak
    ;
    Sakata, Patawee
    ;
    Gridtayawong, Pharit
    ;
    Rueangsawang, Worawut
    ;
    Ponghiransmith, Chattrarat
    Radiative cooling via micro-patterned surfaces provides energy-efficient solution for thermal regulation by enhancing selective thermal emission within the atmospheric transparency window (8–13 μm). This study investigates the effects of microstructural patterning through a low-cost and scalable stamping technique. The patterning templates were uniquely produced by the removal of randomly-distributed CaCO<inf>3</inf> polymorphs—calcite and vaterite with specific sizes. The novel calcite-imprinted structures exhibit superior mid-infrared emissivity (>0.96) and maintain consistent temperature reduction across varying weather conditions, outperforming vaterite-based films. However, the cooling performance of unmodified patterns is limited by solar absorption. To address this, TiO<inf>2</inf> (rutile phase) is incorporated into a polymer matrix before being stamped to enhance solar reflectivity. Moreover, hydrophobic aerogels could be inserted between micropattern gaps to facilitate self-cleaning functionality. A composite film containing 3 wt% TiO<inf>2</inf> with the calcite micro-patterning and hydrophobic aerogel achieves a temperature drop of 4.8 °C, compared to 1.2 °C of pristine patterns relative to that of a clear film. For real-world applicability, the optimized patterning strategies were further validated on fiber cement rooftile surfaces, yielding best temperature reductions of 2.5 °C compared to pattern-free coating under a tropical climate. The calculated net cooling power of 3 wt% TiO<inf>2</inf> patterned film with aerogel is 26.9 W/m<sup>2</sup>. This novel passive-cooling stamping strategy is low-cost, scalable, and suitable for large-area deployment, reducing the energy burden of active cooling technologies.
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    UV–Vis Spectroscopy for Energy Storage and Related Materials
    (2025-01-01)
    Ayawanna, Jiratchaya
    ;
    Chaiyaput, Salisa
    ;
    Kidkhunthod, Pinit
    ;
    Sittimart, Phongsapak
    ;
    Lakhonchai, Anthika
    This chapter has provided the reader with fundamental knowledge of Ultraviolet–visible (UV–Vis) techniques as well as applications on energy storage material and the latest progress in analytical chemistry. With the introduction of the progress in UV–Vis instrument application, this chapter not only presents the opportunity to improve conventional UV–Vis techniques but also announces a bright future for the UV–Vis spectrophotometer to measure more types of samples in practical works.